Commit Graph
37 Commits
Author SHA1 Message Date
Marc SchierandCopilot e80d0ca9ac Use a 4-byte KeyNonce in the reference PubSub sample (#4710)
# Description

The first PubSub exchange in
[docs/PubSub.md](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/docs/PubSub.md#run-a-first-publisher-and-subscriber)
delivers no DataSets on master or in the 2.0.0 source. The subscriber
only logs `DataSetReader Reader 1 faulted on MessageReceiveTimeout`,
while the publisher logs `UADP security wrap failed; dropping message`
with `ArgumentException: AES-CTR nonce must be exactly 12 bytes` for
every NetworkMessage.

Cause: the reference PubSub sample's demo keys use a 12-byte KeyNonce.
Since #4573, the AES-CTR counter block follows OPC 10000-14 Table 157
(`KeyNonce[4] || MessageNonce[8] || BlockCounter[4]`). With the sample's
keys, the publisher builds a 20-byte nonce, and `AesCtrTransform`
rejects it. The 2.0.0 release (release/2.0 at bc5da1006) contains #4573
and the 12-byte sample, so it is affected too.

Fix: the sample sizes its KeyNonce with
`AesCtrNonceLayout.KeyNonceLength`. No SDK change.

Regression test:
`PubSubAotTests.SamplePublisherDeliversSecuredDataSetToSampleSubscriberAsync`
starts the sample publisher and subscriber with the sample keys over
unicast loopback and waits for a DataSet. The existing sample-based AOT
tests only built or started the applications, so nothing caught the
regression.

### Validation

| Command | Result |
| --- | --- |
| `tests\Opc.Ua.Aot.Tests\bin\Debug\net10.0\Opc.Ua.Aot.Tests.exe
--treenode-filter
"/*/*/PubSubAotTests/SamplePublisherDeliversSecuredDataSetToSampleSubscriberAsync"`
(JIT), before the fix | Failed: `TimeoutException`, no DataSet within 10
s |
| same, after the fix | Passed, 3 of 3 runs |
| `tests\Opc.Ua.Aot.Tests\bin\Debug\net10.0\Opc.Ua.Aot.Tests.exe
--treenode-filter "/*/*/PubSubAotTests/*"` | 8 of 8 passed |
| The two `dotnet run` commands of the docs/PubSub.md first exchange,
run verbatim | 15 DataSets in 15 s; the publisher logs no failures |

The release/2.0 branch has the same sample and would need a backport,
which is not part of this PR.

## Related Issues

- No tracking issue. Found while re-verifying the documented first
PubSub exchange after the 2.0.0 release.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-10-09 15:17:01 +02:00
romanettandClaude Opus 5.5 9b034f8291 Enable nullable reference types centrally; migrate all unset and annotations-only projects (#4700)
# Description

Nullable reference types are now enabled once, in `common.props`, and
every project in the repository builds warning-clean with them.

**Configuration**
- `<Nullable>enable</Nullable>` lives in `common.props`. All per-project
`<Nullable>` settings are removed: 178 project files (enable,
annotations, and the `disable` in the three Aot test projects).
- 419 per-file `#nullable enable`/`restore` directives and the 4
`#nullable disable` directives are removed.
- Kept on purpose:
- The 5 `<auto-generated>` schema files (`UANodeSet.cs`, `UA Type
Dictionary.cs`, `OPCBinarySchema.cs`, `SecuredApplication.cs`,
`PInvokeHelper.cs`) keep `#nullable enable`. The compiler ignores the
project setting in generated code, so the directive is required there.
- `tests/Opc.Ua.Interop.LegacyPeer` keeps `disable`. It builds against
the 1.5.378 packages and does not import the repository props.
- `docs/DeveloperGuide.md` and `.github/copilot-instructions.md` now
describe the central setting.

**Migration** (the 43 unset and 13 annotations-only projects, roughly
10k diagnostics)
- **Production code: annotated at the declarations.** Covers
`tools/Opc.Ua.SourceGeneration.Core`, `src/Opc.Ua.Lds.Server` and the
LDS sample.
- Members, parameters and returns are nullable where null actually
flows.
- Null-check helpers carry `[NotNullWhen]` (`IsNull`, `IsValidXmlName`,
`IsMethodTypeDesign`).
- `CoreUtils.Format`, `Utils.Format`, `ITemplateWriter.WriteLine` take
`params object?[]`. `Template.AddReplacement` takes `string?` (rendering
already skips null replacements).
- `IRegisteredServerStore.RegisterAsync` returns
`Task<RegistrationEntry?>`: it returns null when a registration is
removed.
- Dereferences backed by an invariant (for example, the validated model)
use `!`, so runtime behaviour is unchanged.
- **Behavioural changes in production code** (small, deliberate):
- `NodeSetToModelDesign` throws `InvalidOperationException` when the
file is not a NodeSet. Before, it threw a NullReferenceException on the
next line.
- `ModelDesignValidator` starts its lookup tables empty instead of null.
A redundant `if (m_nodes == null) return;` guard is gone.
- **Test code: minimal annotations.**
  - `?` on values that can be null, `!` where the test asserts non-null.
  - `= null!` for fixture members assigned in SetUp.
- `TryGetStructure<T>(out T? x)` where the inferred `T?` broke the
`IEncodeable` constraint.
- A few redundant `== null` checks on structs (`NodeId`, `ArrayOf<T>`)
folded into the adjacent `IsNull`/`Count` checks.

**Notes for reviewers**
- The diff is large (~1,500 files) but almost entirely mechanical: `?`,
`!` and directive removal. The non-annotation changes are listed above.
- Known follow-up, not done here:
`IModelDesign.Namespaces/TargetNamespace/NamespaceUris` stay
non-nullable even though the validator returns null before it loads a
dictionary. Making them nullable would ripple through every generator
call site.

## Related Issues

- Fixes #4439

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

The "no new warnings" box covers net10.0 and net48: full non-incremental
builds of `UA.slnx`, `tools/SourceGeneration.slnx`,
`tools/MigrationAnalyzer.slnx` and the Aot test projects finished with 0
warnings and 0 errors under the repository's warnings-as-errors
settings. net9.0 and net8.0 also had no nullable diagnostics, but they
were not rebuilt after the final fixes. Tests have not been run locally
yet.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-08 08:48:13 +02:00
Klaus Landsdorf cc7908eaa1 WebApi: serve a generated OpenAPI document of the REST binding (opt-in) and map the session-less service set (#4657)
Reworked after the review: the OpenAPI document is generated from the
code, not embedded; the route is opt-in; `StatusCode` is not accepted.
The branch is a new history on top of master (the first version
conflicted); master with #4674 is merged in.

# Description

The REST binding implements the routes of the OPC Foundation OpenAPI
mapping (OPC 10000-6 §G.3), but it does not describe them: `GET
/openapi.json` is answered with HTTP 405, and a client generator has
nothing to read from the server. `docs/WebApi.md` listed a generated
OpenAPI document as a deferred follow-up.

The coded API is the source of truth, so this PR **generates** the
document from the route table and from the structure definitions of the
request and response types, and compares it with the document the model
compiler publishes in tests. Nothing from `UA-Nodeset/OpenApi` ships in
the package.

## Changes

### Service sets (`Opc.Ua.Core`)

- `WebApiServiceSet` (`AllServices`, `Sessionless`) and
`WebApiServiceRoutes.GetRoutes(serviceSet)`. `Sessionless` is the eight
services of `opc.ua.openapi.sessionless.json` (OPC 10000-4 §6.3): Read,
Write, HistoryRead, HistoryUpdate, Call, Browse, BrowseNext,
TranslateBrowsePathsToNodeIds.

### Generator (`Opc.Ua.Core.Schema`, `Opc.Ua.Schema.OpenApi`)

- `WebApiOpenApiGenerator.Generate(serviceSet, includeSchemas,
serverUrl)` returns the OpenAPI 3.0 document as a `JsonObject`. It is
built at runtime from `WebApiServiceRoutes` and the
`StructureDefinition`/`EnumDefinition` of the message types (the same
definitions the schema generation uses, resolved through
`IDataTypeDefinitionResolver`). No reflection, so it is NativeAOT
compatible; the AOT test project covers it.
- **Two levels of detail**, because full schemas make big documents:

  | | Content | All 28 services |
  | --- | --- | --- |
| default | paths, `operationId`s, every body a JSON object | about 12
KB |
| `includeSchemas: true` | one component schema per message, structure
and enumeration (100), for typed client generators | about 46 KB |

  The two published files are about 300 KB together.
- The schemas describe the Compact JSON encoding, with the property
names, types, formats and integer ranges of the published documents.
DataValue is the one structure that differs: its status property is
`Status`, as in Part 6 Table 42.
- `OpenApiBuiltInSchemas` holds the schemas of the built-in types
(StatusCode, LocalizedText, Variant, DataValue, DiagnosticInfo,
ExtensionObject and the scalar types) as the encoder writes them.
Abstract `Structure` fields are ExtensionObjects, abstract number fields
are Variants.

### Serving the document (`Opc.Ua.Bindings.Https`)

- `WebApiTransportOptions`: `ServiceSet`, `OpenApiDocumentPath` (default
`null`: **off**) and `OpenApiIncludeSchemas` (default `false`).
- `MapWebApiEndpoints(WebApiTransportOptions)` maps the routes of the
service set and, when a path is set, the `GET` route of the document
**in the same route group**. The route has no `AllowAnonymous` metadata.
When an authentication scheme is registered, the contributor's
`group.RequireAuthorization()` covers the document like `POST /read`;
only `/findservers` and `/getendpoints` stay anonymous. The existing
`MapWebApiEndpoints()` maps all routes as before.
- The document is generated once per path base (listed as a relative
`servers` URL; without a path base the list is omitted) by the
`WebApiOpenApiGenerator` that `AddWebApiTransport` registers, or by a
default one.
- `Opc.Ua.Bindings.Https` references `Opc.Ua.Core.Schema` on net8.0 and
later.

### Documentation

- `docs/OpenApi.md` (new, linked from `docs/README.md`): serving the
document, the two levels, generating clients, the JSON generated clients
send, known issues, how the document is kept correct, troubleshooting.
- `docs/WebApi.md`: new section "Service sets and the OpenAPI document";
the deferred follow-up is removed. `docs/SchemaGeneration.md` and both
`NugetREADME.md` files describe the generator and the options.

## Comparison with the model compiler documents

The two published documents are test resources of
`Opc.Ua.Core.Schema.Tests` only (README next to them: source commit and
update procedure). `WebApiOpenApiConformanceTests` compares the
generated document with them for both service sets:

- paths, `operationId`s, and the request and response schema of every
operation;
- the set of component schemas the operations reach: equal (100 for all
services);
- every enumeration (members and values);
- for every structure: property names, types, formats, integer ranges,
and inheritance.

Everything both describe is equal. The test lists the differences and
fails when a listed one disappears or a new one appears:

| Difference | Generated | Published | Reason |
| --- | --- | --- | --- |
| DataValue status property | `Status` | `StatusCode` | Part 6 Table 42;
UA-Nodeset#146 is open. The stack only knows `Status` (encoder and
decoder). |
| `description`, `default` keywords | not written | spec links, .NET
defaults | documentation and defaults, not contract; Compact omits
default values |

`WebApiOpenApiWireFormatTests` validates what the binding really writes
(the default request and response of all 28 routes, plus populated
requests and responses with variants, status codes, references, identity
tokens and notifications) against the generated component schemas.

## Tests

- `Opc.Ua.Core.Schema.Tests` `OpenApi/`: `WebApiOpenApiGeneratorTests`
(shape of the document, both levels, both service sets, servers list,
sorting and determinism, concurrency, argument and resolver errors,
every built-in type, arrays and ranks, enumerations, option sets,
unions, base types, self-references, unknown definitions),
`WebApiOpenApiConformanceTests`, `WebApiOpenApiWireFormatTests`,
`OpenApiBuiltInSchemasTests`: 81 tests.
- `Opc.Ua.Bindings.Https.WebApi.Tests`:
`WebApiOpenApiDocumentEndpointTests` (TestServer with the startup
contributor: off by default, configured path, both levels, service set
maps and describes only the sessionless routes, path base, repeated
requests, registered generator is used, **a request without credentials
gets 401 when an authentication scheme is registered while one with
credentials gets 200, the route carries `IAuthorizeData` and no
`IAllowAnonymous`**, argument checks), options defaults and DI
registration of the generator.
- `Opc.Ua.Core.Tests`: `GetRoutes` for both sets and an undefined value.
- `Opc.Ua.Aot.Tests`: the generator and a served document under the AOT
fixture.
- Results (macOS arm64): `Opc.Ua.Core.Schema.Tests` 260/260,
`Opc.Ua.Bindings.Https.WebApi.Tests` 457/457, `Opc.Ua.Core.Tests` WebApi
tests 110/110, each on net10.0 and net8.0 (Release). `Opc.Ua.Aot.Tests`
(JIT run) SchemaAotTests 5/5, WebApiAotTests 8/8.
- `Opc.Ua.Core`, `Opc.Ua.Core.Schema` and `Opc.Ua.Bindings.Https` and
the three test projects build for net48, net8.0, net9.0 and net10.0
(Release) with 0 warnings and 0 errors (net48 builds only; the Windows
legs of the fork CI run its tests). `dotnet format` whitespace, style
and analyzers (`--severity info`) are clean on every changed file; the
two `RCS1090` hits in `SchemaAotTests.cs` are on lines that master
already has.
- Patch coverage with `.azurepipelines/check-coverage.ps1` against
master (`Opc.Ua.Core.Schema.Tests`, `Opc.Ua.Bindings.Https.WebApi.Tests`
and the WebApi tests of `Opc.Ua.Core.Tests`, net10.0): 362/362 changed
lines covered.
- Fork CI (full matrix incl. macOS) and CodeQL on `f990af5db` (master
with #4674 merged in): [CI run
37310622902](https://github.com/biancode/UA-.NETStandard/actions/runs/37310622902)
green, [CodeQL run
37310626786](https://github.com/biancode/UA-.NETStandard/actions/runs/37310626786)
green. The run on the earlier head `abda0e491` had one failure outside
this PR:
`McpServerProcessTests.HttpTransportAliasesExposeOnlyMcpRouteAsync("http")`
timed out after 30 s on Windows net10.0; this PR does not touch
`tools/`.

## Not in this PR

- Authentication: the fix discussed in the review is @romanett's #4674.
The document route uses whatever the REST routes use; this PR does not
change authentication.
- `StatusCode` tolerance in the decoder: dropped, the spec text is the
reference. The first commit of the previous version is gone.
- Samples.
- Session-less invocation on the server side (OPC 10000-4 §6.3) is a
separate draft PR. With `ServiceSet = Sessionless` this PR only limits
the mapped routes and the document.

## Questions

1. `Opc.Ua.Bindings.Https` now references `Opc.Ua.Core.Schema` (net8.0
and later) because the generator lives next to the other schema
generators and is trimmed away when unused. Fine, or should it move into
`Opc.Ua.Core`?
2. Should `OpenApiIncludeSchemas` default to `false` as here, or should
a host get typed clients out of the box?

## Related Issues

- Fixes #4656

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed. (Affected
suites on net10.0 and net8.0 locally on macOS; .NET Framework is covered
by the fork CI's Windows net48 legs.)
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.
2026-10-06 09:43:28 +02:00
2f5aeb3da4 Fix Medium encoder/decoder defects found by the second codec review (#4625)
## Summary

This is the follow-up to #4599. A second read-only review of
`src/Opc.Ua.Types/Encoders` was run on master after #4599 merged. It
found about 40 defects: none Critical or High, 10 Medium. This PR fixes
the 10 Medium ones. Each fix follows the OPC 10000-6 clause named in the
table, and each has regression tests.

| Finding | Fix | Part 6 |
|---|---|---|
| **Regression from #4599:** a nested JSON array (`[[1,2]]`) decoded as
an *empty* Byte/SByte array or ByteString, even with ParseStrict. Debug
builds hit a `Debug.Assert` fail-fast instead. | Return false when
`TryGetArrayElements` rejects the input | 5.4.5 |
| A malformed `UaTypeId` was accepted as a raw JSON body with no type |
Decoding error when ParseStrict is on; the raw-body fallback is kept
when it is off | 5.4.2.16 |
| With namespace mappings active, the Binary/XML decoders and
`XmlParser` turned `nsu=…` ExpandedNodeIds into `ns=0` | Skip the index
mapping when a NamespaceUri was decoded | 5.2.2.10 |
| An ExtensionObject with no `Body` failed to decode when its field is
in a companion namespace | `PopNamespace` before `EndField` (XmlDecoder
and XmlParser) | 5.3.1.16 |
| Null DiagnosticInfo/DataValue array elements were left out of the XML
output, so array positions shifted | Pass `isArrayElement` so they are
written as nil elements | 5.3.4 |
| CR characters were lost in XML strings, and a string NodeId containing
one changed | Write CR as `&#xD;`; this also works with caller-supplied
writers | 5.3.1.5, XML 1.0 §2.11 |
| A null element in a structure array/matrix caused a
NullReferenceException in `JsonEncoder` | Write JSON `null` | 5.4.5 |
| An ExtensionObject with a null ByteString/XmlElement body was written
as encoding 0x01 with Length -1 | Write encoding 0x00 (no body) |
5.2.2.15 |
| Default Number/Integer/UInteger structure fields threw
BadEncodingError in Binary/XML. Integer arrays with values did not
round-trip through XML. | `Variant.CreateDefault` returns a Variant
default for these types; the XML decoders read such array fields as
Variant arrays | 5.1.6 |

### Behaviour changes
- Encoding a null-body ExtensionObject in binary now produces encoding
`0x00`.
`WriteExtensionObject_NullByteString_WritesTypeIdAndNoneEncoding` had
pinned `Binary`, which contradicted its own name; it now expects `None`.
- With ParseStrict, the JSON decoder rejects a present but unparsable
`UaTypeId`.

### Review follow-up (3f87a144a)
- `Structure.EncodeProperty` now converts a concrete-typed array or
matrix (e.g. `Int32[]`, `Double[,]`) in a
BaseDataType/Number/Integer/UInteger field into Variants (5.1.6).
Before, it was written as a raw typed array that the decoders read as
Variants, which misparsed binary.
- The XML decoders and `Variant.CreateDefault` also map abstract-number
matrix fields to Variant, and keep the declared value rank.
- Not included: `BaseComplexType` in Opc.Ua.Client.ComplexTypes has the
same concrete-array asymmetry. Fixing it needs a public helper, because
`Variant.Expand` is internal.
- Re-run after the follow-up, all on net10 with no failures: Types
11,400 passed, Core.Encoders 2,947, ComplexTypes 2,872, Encoders.Fuzz
8,112. The net48 build has no errors.

### Variant equality for typed null arrays (b30e1cdd0)
- A typed null array or matrix, such as an unset `Int32[]` or
`Variant[]` field, already equalled `Variant.Null` and hashed like it,
but did not equal an identical typed null or even itself. Two such
variants of the same or a convertible type now compare equal, so
`Equals` agrees with `GetHashCode` and `Structure.IsEqual` holds for
identical default structures (5.1.11). Typed nulls of unrelated types
are still unequal.
- Suites run on net10 for this change, no failures except where noted:
Types 11,402 passed, Core.Encoders 2,947, ComplexTypes 2,872, Server
7,802, Encoders.Fuzz 8,112. Core had 1 failure,
`ActivityTraceFlags_Metrics_ShouldRecordMetricsOnly`, caused by a metric
from another test running in parallel; it passed 3 of 3 runs on its own.

## Test plan
- [x] New `CodecReviewRegressionTests` (33 tests). With the source fixes
reverted, 29 of them fail; the other 4 confirm that valid input still
decodes.
- [x] Opc.Ua.Types.Tests (net10): 11,395 passed with only the old
null-body test failing; after updating that test, it and the new tests
pass (801/801 in the BinaryEncoder + new-test run). The whole suite was
not rerun after the update.
- [x] Opc.Ua.Core.Encoders.Tests (2,947),
Opc.Ua.Client.ComplexTypes.Tests (2,872), Opc.Ua.Encoders.Fuzz.Tests
(8,112): all green on net10.
- [x] net48: Types.Tests builds with 0 errors; the new tests plus the
updated test pass (34/34).

The Low findings from the review (about 30, mostly `XmlParser` leniency,
culture-sensitive enum parsing and latent API-only issues) are not part
of this PR.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
2026-10-02 17:10:23 +02:00
20c2d77d57 Fix Core/Types audit findings and conform them to the OPC UA spec (stacked on #4569) (#4573)
> **Stacked on #4569.** The base branch is
`romanett/practical-murdock-fd9c56`, so this diff shows only the commits
of this PR. Retarget to `master` after #4569 merges.

## Summary

Bug audit of `Opc.Ua.Core`, `Opc.Ua.Core.Types`, `Opc.Ua.Types` and
`Opc.Ua.Core.Schema`, with the findings fixed and the fixes grounded
against the OPC UA specification (reference.opcfoundation.org). 133
commits in four groups:

1. **Audit fixes** (`Fix <ID>: ...`): 116 findings from a read-only
audit, each with a regression test. IDs follow the audit scopes: T1-T6
`Opc.Ua.Types`, C1-C4 `Opc.Ua.Core`, S1 `Opc.Ua.Core.Types` +
`Opc.Ua.Core.Schema`.
2. **Review fixes** (`Fix review <ID>: ...`): issues a code review of
group 1 found, plus lower-severity leftovers.
3. **Spec fixes** (`Spec: #<n> ...`): the 18 places where an earlier fix
only partly matched the spec text.
4. Test and analyzer follow-ups.

Where `master` (#4516, #4522, #4540, #4564) or #4569 already fixed the
same issue, their version was kept and this PR only adds what they
didn't cover.

## Behaviour and user-facing changes

### Wire format and interoperability (breaking)
- **PubSub AES-CTR (Aes128-CTR / Aes256-CTR)** now follows Part 14
Tables 156/157:
- The counter block is `KeyNonce[4] | MessageNonce[8] |
BlockCounter[4]`, and the block counter starts at 1.
- The SecurityHeader nonce is 8 bytes: `Random[4] | UInt32
SequenceNumber`, with the sequence number starting at 1.
  - SKS key data is split with a 4-byte KeyNonce, giving 52 / 68 bytes.
- **Not interoperable with earlier releases of this stack**, but matches
the spec. There is a test against the independent RFC 3686 vector.
- **User token signature** (Part 4 6.1.8):
- The signed data is now built from the user token policy's
SecurityPolicy on both client and server.
- It also supports the SecurityMode None layout `ServerNonce |
HASH(ServerCertificate) | ClientNonce`.
- New overload `SecurityPolicyInfo.GetUserTokenSignatureData(...,
MessageSecurityMode)`.
- **Secure channel:**
- The ECC AEAD `LastSequenceNumber` is correct across the 32-bit
sequence wrap (Part 6 6.8.1).
  - The incoming chunk counts against MaxChunkCount/MaxMessageSize.
- The sender no longer lets a message through that is 24 bytes over
MaxMessageSize.
- The OPN response signature is verified without overrunning the buffer
(RSA_DH with differing key sizes).

### Sessions (server)
- **CreateSession nonce:**
- The client nonce is kept on None channels, because the None-mode user
token signature covers it.
- A nonce over 128 bytes returns `Bad_NonceInvalid` on every channel
(Part 4 5.7.2.3).
  - The duplicate-nonce check runs only on secured channels.
- A non-empty nonce under 32 bytes is still accepted on None, for
compatibility.
- **ActivateSession:** an embedded `EccEncryptedSecret` signing
certificate is validated with the server's peer certificate validator
(Part 6 6.8.3). Byte equality with the client certificate is only the
fallback when no validator is available. New opt-in interface
`ICertificateValidatorProvider`.
- **FindServers / GetEndpoints:** `GatewayServerUri` and
`DiscoveryProfileUri` are no longer swapped.

### Write, Read and Call (NodeState / node managers)
- **UserWriteMask:**
- Enforced for non-value attributes and for VariableType Value writes
(`ValueForVariableType`), returning `Bad_UserAccessDenied`.
- An unconfigured UserWriteMask (0, no handler) is not enforced, and
reads back as the WriteMask so Read and Write agree (Part 3 8.60).
- A throwing or Bad `OnReadUserWriteMask` handler fails only that item.
- **Index-range writes:**
- Slices are merged into the cached value under the attribute lock, also
for `OnWriteValueAsync` handlers.
- A data-change notification is still produced when the cache cannot
absorb the slice.
- The slice must match the unclipped range, otherwise
`Bad_IndexRangeDataMismatch` (new status code in `Opc.Ua.Types`).
  - A range past the target returns `Bad_IndexRangeNoData`.
- A handler without index-range support returns `Bad_WriteNotSupported`
(Part 4 7.27, 5.11.4.4).
- **Index-range reads on matrices** return partial results clipped to
the source, instead of allocating the requested size (a Read with
`"0:40000,0:40000"` no longer allocates about 1.6e9 elements).
- **DataTypeDefinition writes:**
- A value that isn't a decoded DataTypeDefinition, or whose kind doesn't
match the DataType category, returns `Bad_TypeMismatch`.
  - Null is rejected for concrete Structure/Enumeration/OptionSet types.
  - WriteMask is checked first (Part 3 5.8.3).
- **AnalogItem:** a null write skips the InstrumentRange check again.
- **Method call:** the async fallback passes the ObjectId to the method
handlers.
- **Redundancy:** `DistributedValueParticipation` merges index-range
writes and applies the index range on reads.
- **Change masks:** `ClearChangeMasks` takes the bits atomically, so
concurrent changes are no longer lost.
- **`AccessLevelEx`:** preserved by Clone/Export.

### Alarms & Conditions (Part 9)
- **Acknowledge / Confirm / AddComment:**
- Accept any EventId the condition or its branches reported while that
state is still pending (5.7.3).
  - An unknown id returns `Bad_EventIdUnknown`.
- An already handled state returns `Bad_ConditionBranchAlreadyAcked` /
`...AlreadyConfirmed`.
- AddComment on a branch no longer changes the trunk, and the branch
table is re-keyed when a branch's EventId changes.
- **Shelving:**
  - OneShotShelve without MaxTimeShelved no longer overflows the timer.
- A timed shelve is measured on the monotonic clock, so wall-clock steps
don't delay the unshelve.
  - The state is named `OneShotShelved`.
- **Audit events:**
  - They report failure for rejected method calls.
  - `SelectedResponse` is a UInt32.
  - A rejected negative Respond leaves SelectedResponse unset.
- **`ContentFilterElement.Validate`:** an unknown FilterOperator is
reported per element as `Bad_FilterOperatorInvalid`, instead of failing
the whole service call.

### ContentFilter evaluation (Part 4 7.7.3, on top of #4564)
- **Bitwise operators:**
  - The result takes the size of the larger operand.
- Boolean, numeric String and one-element array operands are converted
to integers implicitly.
  - Types without an implicit integer conversion give NULL.
- **Strings:** ordering is ordinal, no longer culture dependent.
- **Cast:** restricted to the Table 121 conversions, and QualifiedName
to LocalizedText is added. The general `Variant.ConvertTo` keeps its
wider set.
- **Null and empty operands:**
  - `Like` with a NULL operand is NULL.
  - Empty arrays of the same DataType compare equal.
  - Null-string operands are NULL everywhere.

### Encoders and built-in types
- **XML:**
- Strings keep leading, trailing and whitespace-only content (Part 6
5.3.1.5). NodeSet import opts back into treating whitespace-only strings
as empty with the new `XmlDecoder.TreatWhitespaceOnlyStringsAsEmpty`.
- Layout whitespace around `<Identifier>` values is ignored, and
trailing control characters are stripped from `s=` ids.
  - `XmlElement` ignores DTDs without expanding entities.
- **JSON:**
  - A DateTime without an offset is read as UTC.
- An unmappable `nsu=` NodeId and an unknown `svu=` ExpandedNodeId
decode to a namespace-0 String NodeId (5.4.2.10 / 5.4.2.11).
  - `svr=` is rejected in a NodeId field.
  - Bad matrix dimensions return `BadDecodingError`.
  - The non-strict body stack stays balanced after an error.
  - The nesting limits match between encoder and decoder.
- **Binary:**
  - `MaxByteStringLength` no longer applies to strings.
- ExtensionObject bodies count toward the nesting limit on seekable
streams (and in the XML encoder).
- **Parsing:**
  - The NodeId parser requires `i=`/`s=`/`g=`/`b=`.
  - `ExpandedNodeId.Parse` rejects an empty `nsu=`/`svu=`.
  - NumericRange rejects a trailing `,` with `Bad_IndexRangeInvalid`.
  - RelativePath escapes `#`.
- **Status codes:** `StatusCode.WithSubCode`/`WithCodeBits` keep the
severity bits and look up the symbolic id for the new code.
- **Variant / VariantHelper:**
- `TryCastTo` returns false on a type mismatch. So
`DataValue.GetValue<T>(default)` returns the default, and
`GetValueOrDefault` / `CastTo` throw `BadTypeMismatch` as documented.
  - `System.DateTime` casts are supported.
  - Concrete encodeable arrays (e.g. `Argument[]`) no longer throw.
- `ConvertTo` keeps one-element and empty arrays as arrays and checks
the conversion is legal for empty arrays.
- `CastFrom(object[])`, `CastFrom(Enum[])` and the obsolete
`Variant(object)` constructors keep the array shape (previously a
one-element array collapsed to a scalar and an empty one to Null).
- `TypeInfo.Unknown` / `Variant.Null.TypeInfo` report `ValueRanks.Any`.
- **Equality and hashing contracts fixed:**
- Types: Matrix/MatrixOf, typed-null Variants, NodeId (the namespace
index is now hashed), ExpandedNodeId, LocalizedText, DiagnosticInfo,
StructureDefinition/EnumDefinition, CertificateIdentifier, UserIdentity
and DateTimeUtc.
  - `MatrixOf.Dimensions` returns a copy.
  - Decimal equality and hashing now run in bounded time.
- **Localized text:** a LocalizedText with locale `"mul"` and no usable
translations, or null client locale ids, no longer throw.

### NodeSet, address space and utilities
- **NodeSet export/import:**
- Server index 0 is the local server on import and export, so local ids
are no longer written as `svr=65535`.
- `StructureDefinition.BaseDataType` is filled from the supertype on
import.
- **`NodeTable.Import`:** replaces duplicates, keeping the references
neighbouring nodes hold. `TypeTable.Add` detaches a re-parented type
from its old supertype, and `Node.Clone` gets its own ReferenceTable.
- **`StringTable` / `NamespaceTable`:** capped at UInt16 indexes
(`BadEncodingLimitsExceeded`) for Append and Update, instead of silently
wrapping.
- **Small fixes:**
  - `UnsecureRandom.Shared` is seeded randomly.
  - The peer's RetryAfterMs is clamped to one day.
- The `CancelAsync` and `string.GetHashCode(StringComparison)` polyfills
match BCL behaviour.
  - `CoreUtils.IsEqual` compares strings ordinally.

### Schema generation and ComplexTypeSystem
- **JSON schema:** describes the 1.05 layout with the compact/verbose
null rules, and now validates real `JsonEncoder` output.
- **XSD:**
- `EncodingMask` (`xs:unsignedLong`) only for
StructureWithOptionalFields.
  - Guid and StatusCode are complex types.
  - Standard types are in the `Types.xsd` namespace.
- **Structure-backed OptionSets** are described as `{Value, ValidBits}`.
New `UaTypeDescription.IsStructureOptionSet` property and constructor
overload.
- **ComplexTypeSystem:**
- A malformed type in a server dictionary is skipped per type instead of
discarding the whole dictionary.
  - Cyclic supertype walks are bounded.
  - Declared definitions are no longer changed.
  - A dictionary validator is kept only if the dictionary parsed.

### Certificates and trust lists (Part 4 6.1.3, Part 12)
- **Revocation:**
- Checked for issuers supplied in the peer's chain and for
inline-trusted issuers, against the CRLs in the trusted and issuer
stores.
  - A store without CRL support no longer hides "revocation unknown".
- `RejectUnknownRevocationStatus` is honoured for inline-trusted issuers
unless the entry sets `SuppressRevocationStatusUnknown`. This changes
the strict case of `ExplicitIssuerChainIsHonoredWithoutStorePathAsync`.
- **Basic constraints / path length** violations fail with
`Bad_CertificateInvalid`.
- **`TreatAsInvalid`:**
- Now yields `Bad_CertificateUntrusted`, which can't be suppressed or
auto-accepted.
- It is honoured on individual trust-list entries even when the
certificate is also in a store.
- **`EccEncryptedSecret`:** enforces the result of validating the sender
certificate.
- **`TrustListTransaction`:**
- Routes each CRL to the store holding its issuer
(TrustedCrls/IssuerCrls).
- Validates staged CRLs, including the store's CRL support, before
changing anything.
  - Applies certificates before CRLs.
- **Other:**
- One failing `CertificateChanges` observer no longer stops the others.
- `InMemory:` stores share their contents per path, and
`InMemoryStoreProvider` is `IDisposable`.

### WoT (`Opc.Ua.Types/Wot`)
- **Projection security:** projection security schemes whose qualified
names collide are refused. New diagnostic
`WotDiagnosticCode.ProjectionSecurityConflict = 6063`.
- **Input handling:**
- Invalid Unicode (lone surrogates, bad UTF-8) is rejected as
`JsonException`.
  - External-schema results are keyed per affordance.
  - A duplicate security-floor member is rejected.
  - `nsu=` ids are percent-encoded (Part 6 5.1.12).
  - The configured JSON depth is honoured on re-parse.
  - An oversized document is reported before it is parsed back.
- **Performance and limits:**
- Subtype-graph validation, `componentOf` linking and the namespace
table are now linear.
  - Namespaces are capped at UInt16.

### New or changed public API
- `ICertificateValidatorProvider` (server)
- `SecurityPolicyInfo.GetUserTokenSignatureData(...,
MessageSecurityMode)` overload
- `XmlDecoder.TreatWhitespaceOnlyStringsAsEmpty`
- `UaTypeDescription.IsStructureOptionSet` plus a constructor overload
- `WotDiagnosticCode.ProjectionSecurityConflict`
- `StatusCodes.BadIndexRangeDataMismatch` in the `Opc.Ua.Types` list
- `InMemoryStoreProvider : IDisposable`

## Not changed / open
- **Deferred:**
- S1-14 (BSD OptionSet size needs the base type in `UaTypeDescription`,
and BSD is deprecated).
- C2-7 (restoring the own-certificate trust exemption would accept
certificates the spec says to reject; removing the dead code is a
separate decision).
- A1-4 (config values keep surrounding whitespace, as the pre-April-2026
loader did).
  - H-2 (JsonDecoder has no real nesting counter).
- A2-3 (the StringTable cap also applies to diagnostics tables; default
`MaxArrayLength` already bounds them).
- **Needs a product decision:**
- The general `ConvertToString` writes a QualifiedName as `ns:Name`,
while Table 121 drops the namespace.
  - Short (< 32 byte) client nonces are accepted on None channels.

## Verification
- Every commit added a regression test that fails without its fix, where
practical.
- Before the rebases, with all audit and review fixes (before the `Spec:
#…` commits): 0 build warnings and 16 test suites green on net10.0. The
suites: Types, Core, Core.Encoders, Core.Security, Core.Schema, Client,
Client.ComplexTypes, Server, Sessions, Gds, History, Features,
Redundancy.Server, PubSub, WotCon and WotCon.Bindings. Core hit its
known intermittent end-of-run hang once, and reruns were clean.
- The `Spec: #…` fixes were verified per group on their own suites.
Those include PubSub.Udp, Redundancy.PubSub, PubSub.Server,
Configuration and SourceGeneration.Core.
- **Not yet built or tested on this base.** It was rebased onto master
(resolving overlaps with #4522, #4540 and #4564) and then onto #4569.
This PR stays a draft until the full run on this base is green.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
2026-09-29 11:14:15 +00:00
f9892020a3 Add configurable server resource isolation (#4541)
# Description

Add configurable server resource isolation on top of the merged #4522
foundation.

- Coordinate connection, handshake, retained-message,
session-establishment, queue, execution, request-cost and parked-request
limits through one server-scoped provider.
- Keep configured startup, continuity/reconnect, control and
trusted-owner reservations inside existing totals. Shared capacity
remains usable up to explicit owner ceilings.
- Use authoritative Session membership for reassembly continuity
capacity without granting unrelated resource or rate privileges.
Preserve explicit owner mappings and bounded tracking.
- Cache immutable classification evidence while retaining current
Session and classifier checks.
- Support weighted request ordering or FIFO independently of resource
accounting. Installed providers enforce decoded-request limits in both
modes.
- Preserve fail-fast reassembly, valid Abort handling, fixed deadlines,
active-work protection, reverse-connect handoff and bounded OpenAPI
processing.
- Support custom-handler parking through `IRequestParkingPolicy`,
`WithRequestParking(...)`, and `RequestLifetime.ParkSink`. Parking
releases execution capacity only, keeping retained-data and parked
charges until completion. Built-in Publish and the global opt-out remain
unchanged.
- Provide direct, fluent and DI configuration, public incoming-request
parking support, effective startup limit logs and user-facing
documentation.

Balanced remains the default. SharedOnly without an explicit provider
retains shared behavior for intentionally incompatible/unlimited
configurations. Reservations are finite and are not one full-message
allowance per Session.

## Related Issues

Builds on merged #4522. Fixes #4554.

## Review and CI corrections

All three previously missed findings in [review
5326734718](https://github.com/OPCFoundation/UA-.NETStandard/pull/4541#pullrequestreview-5326734718)
are addressed in `9e25e4ecc`:

1. A custom FIFO provider receives RequestQueue, RequestQueueBytes,
RequestExecution and ParkedRequest accounting. A blocked head cannot be
overtaken.
2. `IResourceIsolationReassemblyProvider` replaces the sessionless
threshold independently of `UseFairScheduling`. The aggregate byte
ceiling remains enforced.
3. Runtime `ReservedReassemblyBytes` includes all configured protected
stage floors, including ControlReserved.

The review's two already-resolved changes remain intact.

The CI collection race was fixed at its source in `e1a994a4b`:
`ArrayOf.ToArrayOf` treats a separately read collection count as an
initial capacity hint and grows/trims for the actual enumeration.
Deterministic tests cover growth, shrinkage and stale-zero counts.

The subsequent recovery-test race was fixed in `05753ce77`: fake time
advances only after a gated keepalive response has been processed and
reset its timer, not merely after request arrival. Recovery-order and
timeout assertions remain intact, with additional response-state
assertions. Instrumentation reproduced the original failure twice; both
fixed variants passed 400 executions per framework.

CodeQL alert 388 was verified and dismissed as a false positive. Startup
logs contain aggregate numeric capacities, not credentials or caller
identities.

## Validation

| Scope | Result |
| --- | --- |
| Latest automated checks at `05753ce7775a58801b4ba9d8f6d7781b709d0b89`
| 167 successful, one package-publication check skipped, no failures |
| Remaining external prerequisite | `license/cla` pending: Contributor
License Agreement is not signed yet |
| FIFO/weighted queues, custom parking and server-channel selection |
175 passed on each net10.0/net48 |
| Isolation, configuration and parking-hosting selection | 259 passed
net10.0; 257 passed net48 |
| ArrayOf conversion tests | 73 passed on each net10.0/net48 |
| Recovery-audit and keepalive fixtures | 40 passed on each
net10.0/net48 |
| NativeAOT smoke from preceding updates | Published and executed
successfully |

No tests, assertions, coverage thresholds, or required checks were
weakened. The remaining CLA prerequisite must be completed through [CLA
Assistant](https://cla-assistant.io/OPCFoundation/UA-.NETStandard?pullRequest=4541).

This is not CTT certification or an unconditional network-DDoS,
whole-process-memory or fleet-wide guarantee.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [x] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
2026-09-27 21:11:52 +02:00
Marc Schier fa8d45f2cf Fix server/core validation, lifecycle and protocol regressions (#4477)
# Description

**Server/core audit fixes with regression tests. Latest review-fix
validation, merge validation and earlier acceptance results are
distinguished below.**

This addresses a 95-finding server/core report. Every finding was
reviewed with
the OPC UA specification knowledge base or, where the standard does not
prescribe a C# implementation, the corresponding ownership/configuration
contract. Incorrect or withdrawn subclaims remain qualified rather than
being
presented as additional fixes.

The original checkpoint covers session identity/certificate validation
and
revocation; certificate/key ownership and transactional updates; TCP
reconnect,
receive/admission and buffer lifetime; HTTP quotas; subscription
admission,
durability and pooled payloads; file-operation lifecycle; historian
aggregates;
fluent/state-machine behavior; and related utilities. It includes
targeted
regressions and directly related documentation.

The approved acceptance cleanup is separate in the commit history:

| Cleanup | Verified result |
| --- | --- |
| Invalid identity-policy and KeyCredential fixture inputs | Fixtures
explicitly advertise Username and use its generated policy ID.
Credential persistence uses valid clear mode inside the existing
encrypted admin context. Original permission, lockout and negative
encryption assertions remain. |
| Native GDS lifetime and concurrent connection failures | Retain
ApplicationInstance until client teardown. A deterministic native
reproducer proved the test-only channel cap of 10 was exhausted;
removing that override restores the existing bounded default of 1000. No
global serialization or production quota change. |
| Stress certificate ownership and close accounting | Balance two helper
references and the fake transport's server-certificate ownership.
Replace the invalid event-count bound with exactly-once physical
disposal, opens = closes, zero active entries and one logical entry
lifetime. |
| Participant deadlines | Use the injected TimeProvider with the
existing cross-framework WaitAsync overload. Tests pin one tick before,
exact expiry, terminal notification, recovery and timely completion. |
| Reproducibility and platform assertions | Preserve canonical WoT
bytes/hashes, explicit display-culture contracts and exact
numeric-vector assertions. Accept Apple's CryptographicException subtype
without weakening disposal balance. |
| Missing user-signature proof | Reject null/empty proofs before OS
crypto. Return BadUserSignatureInvalid per Part 4, 5.7.3.3. None-policy
and valid-signature controls remain. A CI-only test nullable-context
error was corrected without changing production behavior. |
| Durable sample restore and shared test storage | Dequeue waits for
actual batch residency instead of treating failed restore completion as
success, and restored files close before deletion. Five deterministic
regressions failed before the fix. The two fixtures that clear the
shared batch directory are isolated; all original 3,000-item assertions
remain unchanged. |

## Latest review follow-up

Commit `828856850219518970e8e2f580b8f94b3c1fc748` fixes the deferred
robotics
disposal reported in the latest review.
`RobotIntentNodeManager.DisposeAsync`
now joins a shared controller-host drain and then explicitly awaits base
node-manager disposal. A controller's bounded shutdown wait may defer
its
cleanup, but no longer lets the node-manager override finish early.
Concurrent
callers, including an asynchronous call after synchronous `Dispose`,
cannot
bypass the drain after the host list has been detached.

Synchronous disposal remains nonblocking for deferred work. Deferred
initialization failures are logged and retained, and base cleanup
failures
propagate to asynchronous callers. The existing controller-level bounded
disposal contract is unchanged; the node-manager contract is documented
in
`docs/Robotics.md`.

| Regression requirement | Evidence |
| --- | --- |
| Wait for deferred hosts; preserve synchronous compatibility and
concurrent joins | `NodeManagerAsyncDisposalWaitsForDeferredHostsAsync`:
four cases covering both entry-point orders and zero/positive host
shutdown waits. All four failed before the fix. |
| Wait through base cleanup and observe failures |
`NodeManagerDisposalWaitsForBaseCleanupAndReportsItsFailureAsync`: four
cases hold the actual base-resource semaphore, verify pending callers
after the host finishes, then check success or the same propagated
exception and exactly-once cleanup. |

The focused `IntentHostingCoverageTests` and
`IntentControllerHostTests.Dispose`
selection passed **30/30 on net10.0 and 30/30 on net48**, with no
failures or
skips. The final net10 solution build passed with zero errors and only
the four
previously documented CA2249 warnings in unchanged fuzz-test code. No
new
warnings, analyzer suppressions, dependencies, or weakened assertions
were added.
The review thread received a commit-specific reply and was explicitly
resolved.

This verification is scoped to the robotics feedback; the earlier full
Subscriptions-run limitation remains recorded in the merge section
below.


## Documentation review follow-up (2026-09-14)

Commit `f9a9686fcc5d3cfd19cbbc8c2d826e20f5c7e72f` addresses the six
follow-up
threads on documentation and implementation rationale. Each has an
in-thread
reply citing the commit and an explicit resolution.

Multiline XML documentation now covers the declarations introduced or
modified
throughout the entire PR, including internal contracts, samples, tests,
and
public members of related private helpers. A syntax-aware inventory
checked
**2,031 declarations across all 256 PR C# paths with zero documentation
gaps**.
A supplementary check also covers **75 previously unchanged public
members**
of private helpers involved in the changed code. Token comparison across
the
conditional-compilation branches proves this follow-up changes **no
executable
C# or test assertions**. Project-file changes are rationale comments
only.

The implementation questions are documented at their source:

| Question | Resolution |
| --- | --- |
| Certificate assembly friendship | Server Push configuration reuses the
internal explicit-subject CSR helper with the existing key; no public
crypto API was added. |
| Core.Types assembly friendship | Server builders use internal
transition callbacks/revision guards; Server.Tests checks the revision
deterministically without creating a public compatibility contract. |
| Always-single-reader notifications | One dequeuer preserves event
order; optional concurrency fans out within one event and joins before
the next event. |
| Asynchronous disposal completion | `DisposeAsync` already joins the
completion published after admitted operations and all cleanup attempts.
The compatibility `Dispose` remains nonblocking to avoid deadlocking an
admitted callback against its own drain. |

The requested detailed review disposition follows. It distinguishes
actual
fixes from confirmed policies and incorrect subclaims rather than
counting every
comment as a new runtime change.


### Detailed disposition of review 5191795284

The [SDK
review](https://github.com/OPCFoundation/UA-.NETStandard/pull/4477#pullrequestreview-5191795284)
was submitted against `1c4a9df6c`, before the subsequent merge and
feedback fixes.
Its **15 inline threads** have each received an action-specific reply
and an
explicit resolution. A fresh GraphQL query verified those replies and
resolution
states; the fixes in `b8a59990f` remain ancestors of the current branch.

| Review concern | Action and disposition | Concrete regression evidence
|
| --- | --- | --- |
| Injected certificate-store providers bypassed | **Fixed.**
Registration, configuration snapshots, and validation use the injected
providers. Explicit custom types remain authoritative; the built-in
Directory catch-all is deferred so native X509 paths and later custom
providers are not captured. Failed store opens dispose the created
store. | `InjectedProviderResolvesRegisteredAndConfiguredTrustStores`
covers default-provider ordering and both registration paths; provider
validation/open-failure cases and the unchanged
`TrustedCertificateInjectedViaIndependentX509StoreIsObservedAsync` cover
real use and independent-store visibility. |
| Unguarded timer-thread leadership callbacks | **Fixed.** Each
subscriber's exception is logged independently and cannot suppress
subsequent subscribers or fail lease operations. `IsLeader` reads the
deadline without invoking application callbacks. |
`ThrowingLeadershipSubscriberDoesNotFailAcquireOrDisposeAsync`,
`ExpiryNotifiesOtherSubscribersWhenOneThrowsAsync`, and
`IsLeaderDoesNotDispatchExpiryNotificationsAsync` were all demonstrated
failing before the fix. |
| Legacy pending-key provider accepts an unfinishable regenerated CSR |
**Fixed by explicit capability validation.** A provider implementing
only `IPendingCertificateKeyStore` receives `BadNotSupported` before key
generation or persistence when regeneration is requested. Existing-key
CSR/update remains supported. Regeneration requires matching-only
consumption; no unsafe destructive probing was introduced. |
`LegacyPendingProviderRejectsRegenerationBeforeCreatingOrSavingAKeyAsync`
checks no key or store mutation;
`LegacyPendingProviderCompletesExistingKeySigningAndUpdateAsync` proves
the supported flow completes. |
| Shutdown waits behind user deactivation | **Fixed.** Accepted
deactivations drain before the master's lifecycle gate is taken.
Configuration retains its binding until the shared drain completes,
including concurrent shutdown callers and direct master disposal. | Four
cases of `ShutdownDrainsDeactivationOutsideTheSessionClosingGateAsync`
exercise real configuration/binding/ServerInternalData/master reentry,
retained address space, exact session/subscription closure, and no
production cancellation shortcut. |
| Subclass cleanup runs under the operation-lifetime lock | **Fixed.**
Cleanup starts outside that lock. A pre-published completion joins all
disposers, and only the active asynchronous teardown context may use
guarded helpers. Captured contexts lose that privilege when the callback
exits. |
`SynchronousOwnedCleanupLetsSamplingWorkerReachClosedAdmissionAsync`,
`DisposeCoreCanUseGuardedMembersWithoutReopeningCallerAdmissionAsync`,
captured-context rejection, and exact cleanup-failure/ownership
assertions cover both synchronous and suspended cleanup. |
| Discovery requestId-zero chunk read after pool return | **Fixed by the
earlier merge.** Discovery validation precedes `SaveIntermediateChunk`;
no read occurs after that path can return the buffer. The ordering is
retained. | `DiscoveryChannelReadsTheFirstChunkBeforeItIsReturnedAsync`
uses a poisoning pool and the requestId-zero path. |
| T1.8 OPN cleanup misses post-decryption throws | **Fixed by the
earlier merge and pinned with new regressions.** Both sequence rejection
and certificate mismatch release the decrypted body and input ownership.
| `OpenSecureChannelRejectionAfterDecryptionReturnsEveryRentalAsync`
checks the exact audit status and pool conservation. Omitting either
corresponding release in an isolated snapshot made its case fail; no
mutation remains. |
| T1.2 mount-root protection depends on the provider | **Fixed at the
host boundary.** Separator-only aliases resolve to the protected root.
Traversal, empty/whitespace segments, backslashes, and drive/stream
qualifiers are rejected before arbitrary providers are invoked. Valid
nested paths and root destinations remain supported. | A deliberately
permissive provider is used by
`NonCanonicalObjectPathsCannotDeleteMoveOrCopyAsync` and invalid-target
cases; exact zero-call checks are paired with legitimate
nested-path/root-destination controls. |
| Inline trusted/issuer entries now face CRL checks | **Intentional
strict behavior, documented and tested.** A configured backing store
with strict unknown-status rejection requires current revocation
information. Explicit-only lists without a store retain their no-store
behavior. Actual revocation cannot be suppressed; a matching store
entry's policy takes precedence. |
`InlineIssuerWithStoreHonorsStrictUnknownRevocationPolicyAsync`,
`InlineIssuerRevocationIsNeverSuppressedAsync`, store-precedence cases,
and explicit-only controls preserve the missing-information versus
actual-revocation distinction in Part 4 6.1.3. |
| RSA minimum applied to unspecified ECC identifiers | **Fixed at the
application-certificate check.** The RSA minimum is compared only with
an actual RSA public key. An unspecified ECC identity is not replaced
simply because its key size is below an RSA threshold. |
`SilentCertificateCheckPreservesUnspecifiedEccIdentityAsync` checks DER,
thumbprint, store contents, and private-key retention; explicit RSA and
HTTPS minimum controls remain. |
| Failed directory refresh wedges corrective mutations | **Fixed.**
Recoverable automatic pre-refresh failures are logged and leave
reconciliation pending, but do not block corrective provider mutations.
Explicit refresh errors, capacity admission, caller cancellation, and
actual provider denials remain enforced. |
`CorrectiveDeleteRecoversAfterPersistentOverLimitRefreshFailureAsync`
converges an externally over-limit directory back to its exact allowed
contents. Capacity, cancellation/token, and six refresh-error controls
check negative paths. |
| Timed-transition rejection logs at 10 Hz | **Fixed.** Repeated
`(state, revision, status)` warnings are deduplicated without changing
the retry cadence. A different status or state entry permits another
warning. | `RepeatedTimedRejectionLogsOnceAndRecoversAsync` checks one
warning over eleven rejections and success on the next attempt.
Status-change and same/different-state reentry controls pin reset
behavior. |
| Bad unsubscribe strands retired-generation bookkeeping | **Fixed.**
Retired all-event bookkeeping completes even when unsubscribe reports
Bad; the first Bad is still returned to the caller. | Good and
BadCommunicationError cases of
`RetiredAllEventsDeletionCompletesBookkeepingAndReleasesGenerationAsync`
check event/snapshot removal, generation release, and exactly one
unsubscribe without finalization replay. |
| CSR subject parsing and fallback | **Fixed for existing and
regenerated keys.** Omitted subjects fall back to the actual stored
certificate. Regeneration resolves the public certificate's subject
before creating a key. Malformed or unresolvable subjects return
`BadInvalidArgument` before pending-key mutation. | Store-only fallback,
real-generator null/empty cases, and missing-subject/malformed-DN
controls verify the signed CSR, matching fresh pending key, unchanged
active identity, and no destructive side effects. |
| Committed RemoveUser change reported as failed | **Fixed for
RemoveUser and ModifyUser.** Accepted cleanup is still awaited and close
failures remain logged, but cannot replace the committed mutation
result. Precommit failures retain their original result and side
effects. |
`CommittedUserChangeKeepsResultAndPublishedUsersWhenCloseFailsAsync`
checks published Users, Good result, logging, and continued closes.
`FailedUserChangeKeepsPublishedUsersAndDoesNotCloseSessionsAsync` checks
BadNotFound with no publication or close. |
| Alleged pooled decoded-request aliasing | **No runtime redesign
needed; reviewer rebuttal confirmed.** The decoder copies the relevant
input data. Misleading ownership comments were corrected rather than
introducing a new dispatch model. |
`DecodedRequestRetainsValuesAfterInputBuffersAreReturnedAsync` checks
the exact decoded NodeId and ByteString after returned arrays are
poisoned. |

The current documentation-only follow-up rechecked **104 Core, 473
Server, and
4 Configuration cases** covering these concerns: **581 passed, zero
failed or
skipped**. The final net10 solution build also passed with **zero
warnings and
errors**. The complete earlier Core/Server/Configuration and net48
results remain
listed separately rather than being presented as rerun current-head
acceptance.

## Earlier review follow-up

Commit `b8a59990fe2e8e967a12ffd5d9158beed7831143` addresses all 19
review
threads. Each thread has an in-thread reply naming this commit and was
explicitly
resolved after verification; the final paginated query found 19 resolved
and
zero unresolved threads.

The follow-up fixes injected certificate-store selection (including
default
provider ordering and native X509 paths), actual-RSA minimum
enforcement, and
CSR capability/subject validation before key mutation. Node-manager
teardown
uses simpler scoped ownership and drains accepted user revocation
outside the
master gate; committed user results and retired-event cleanup remain
correct
when cleanup reports failure. File mutations can recover after failed
refresh
without bypassing capacity or cancellation, provider paths protect mount
roots,
and repeated timed rejections no longer flood logs. Leadership
subscriber
failures are isolated without callbacks from `IsLeader`.

Regressions also pin the already-merged OPN/discovery buffer fixes and
prove
decoded request values do not borrow returned input buffers. The strict
inline
issuer revocation policy is documented and tested, not weakened.
Existing tests
were changed only for the reviewed behavior: the incorrect
committed-user result
was corrected, and inline-issuer/root-alias controls were expanded.

### Review-fix validation

| Suite | Scope | Framework | Passed | Existing TRX NotExecuted |
| --- | --- | --- | ---: | ---: |
| Core | Complete project | net10.0 | 4,970 | 88 |
| Server | Complete project | net10.0 | 6,414 | 69 |
| Configuration | Complete project | net10.0 | 231 | 0 |
| Core | Certificate, lease and buffer compatibility slice | net48 | 153
| 0 |
| Server | Reviewed lifecycle, user, file, timer and CSR compatibility
slice | net48 | 692 | 0 |
| Configuration | Complete project | net48 | 231 | 0 |
| CSR provider regressions | Final portable-mock follow-up | net10.0 |
11 | 0 |

All runs exited successfully with normal concurrency and leak detection.
The Server console reports 5 skips; its TRX additionally records
existing
assumption/explicit cases, hence the 69-record count above. The
Framework build
caught two modern-only `ValueTask.CompletedTask` usages in new mock
setup; only
those expressions changed to the equivalent portable
`default(ValueTask)`.
The complete modern suites precede that test-only correction; all
production
files remained byte-identical, and the corrected fixture passed on both
targets.

The final net10 solution build succeeded with 0 errors and the same 4
CA2249
warnings in unchanged fuzz-test code. Diff checks and changed-line
whitespace
checks are clean; whole-file formatting still identifies 10 unchanged
baseline
lines, which were not reformatted outside the feedback scope. The
committed
35-file tree was hash-verified against the validation inputs.

This is the review-feedback verification scope, not a rerun or sign-off
of the
historical complete platform/native/soak acceptance campaign below.


## Latest upstream merge

Merge `9d9bf679f317164c5b2b90924cd3cdc27a86d451` integrates `master`
through `162fc5ebb` (#4486),
including the AddNodes child-name index, shared certificate-error
reporting,
CTT sample-data corrections, and the accompanying regressions and
documentation.

The CreateSession conflict preserves this branch's certificate
ownership,
required certificate, application-URI, and channel-certificate checks.
The
validation result now retains nested errors through `ThrowIfInvalid`,
allowing
the upstream shared reporting helper to mask trust, policy, and
revocation
failures consistently without losing audit detail.

The new indexed AddNodes regression initially attempted to reuse a
deterministic
NodeId after renaming its existing node. Renaming frees the BrowseName,
not that
NodeId. `IndexedBrowseNameReusePreservesExistingNodeIdentityAsync` now
proves
both contracts: the derived-ID collision leaves the original node
intact, then
a fresh explicitly requested ID can reuse the old name while the new
name
remains protected against duplicates. No production identity rule was
relaxed.
The incoming seeded random-index test uses the existing `UnsecureRandom`
wrapper
with the same seed and sequence; no new analyzer suppression was added.

| Local merge validation | Framework | Passed | Existing exclusions |
| --- | --- | ---: | ---: |
| Core, complete project | net10.0 | 5,081 | 88 |
| NodeState / BaseInstanceState | net10.0 | 579 | 0 |
| Server node management, certificate and session-security selection |
net10.0 | 112 | 0 |
| InformationModel node-management services | net10.0 | 29 | 1 |
| NodeState / BaseInstanceState | net48 | 578 | 0 |
| Core certificate validation, error reporting and TCP buffers | net48 |
111 | 0 |
| Server node management, certificate and session-security selection |
net48 | 112 | 0 |

All selected runs exited successfully at normal concurrency: **6,602
passing
test executions**. Modified test assemblies were explicitly rebuilt, and
the
combined name/identity regression was verified by name in both net10 and
net48
results. No skips or weakened assertions were introduced.

The final `dotnet build UA.slnx -c Release --no-restore -m:1` with
`CustomTestTarget=net10.0` succeeded with **zero warnings and zero
errors**.
The resolved source and adjusted tests pass whitespace verification, and
their
source hashes match the validation inputs.

This is merge-specific verification. Earlier review results and the
previously
reported incomplete full Subscriptions runs below remain scoped to their
own
commits; they were not reopened or relabeled as passing by this
operation.

## Previous upstream merge (2026-09-15 morning)

Merge `c4694e20ab089c555af233642042133ff3a03ac8` integrates `master`
through `484d6c887`, retaining
#4481's shared Like parser/GDS query fixes, #4488's RequestHandle
recovery in
ServiceFaults, and #4487's expired-session and durable-transfer
corrections.

Three conflict resolutions preserve both sides:

- Alias searches now use the shared `LikePattern` implementation,
including
upstream malformed-list validation. A timeout overload retains this
branch's
100 ms per-alias deadline and `BadTimeout` reporting without keeping a
second
wildcard translator. The shared matcher's original unlimited overload
remains
unchanged for existing GDS/ContentFilter callers. New regressions cover
bounded prefix/list scans, reuse after timeout, and the alias service
result.
- Expired activation closes outside the session-manager gate using
upstream's
once-only timeout claim, audit, and diagnostic accounting. This branch's
  original-channel and security-policy checks remain in place.
- TCP buffer tests retain this branch's ownership, poisoning-pool and
post-decryption checks alongside the upstream RequestHandle/fault
overload
  tests; neither set was discarded.

The upstream HTTPS binary behavior is intentionally retained: a decoder
`ServiceResultException` produces HTTP 200 with an OPC UA ServiceFault
carrying
the decoder status, response timestamp, and recoverable RequestHandle,
rather
than the previous HTTP 500 text response. Other exceptions retain their
existing HTTP error handling.

| Local validation | Framework | Passed | TRX NotExecuted |
| --- | --- | ---: | ---: |
| Core, complete project | net10.0 | 5,054 | 88 |
| Sessions, complete project | net10.0 | 780 | 610 |
| Server aliases, expiry/security and subscriptions | net10.0 | 288 | 0
|
| GDS database, paging and live directory calls | net10.0 | 263 | 0 |
| Shared Like patterns and bounded evaluation | net10.0 | 109 | 0 |
| Subscriptions transfer/durability/service selection | net10.0 | 23 | 1
|
| HTTPS WebApi, complete project | net10.0 | 346 | 0 |
| InformationModel aliases | net10.0 | 54 | 5 |
| Shared Like patterns and bounded evaluation | net48 | 109 | 0 |
| Core fault handles, TCP/HTTPS and filters | net48 | 268 | 0 |
| Server aliases, expiry/security and subscriptions | net48 | 288 | 0 |

These selected runs exited successfully with normal test concurrency:
**7,582 passing test executions**. Sessions' console reports 379 skips;
the
TRX also contains conditional/assumption exclusions, so the table uses
the
actual 610 NotExecuted records. No skips or weakened assertions were
added.
The new `EvaluationTimeoutBoundsWorkAndPreservesPatternReuse` and
`SharedPatternTimeoutRemainsAnAliasServiceError` tests passed on both
targets.

**Validation limitation:** two unfiltered Subscriptions runs did not
produce
a final result and were stopped, including a retry with a hang guard.
They
are not counted as passing. The isolated failover fixture passed 2/2,
and the
transfer/durability/service selection above passed. The stall's cause
was not
established; no unrelated code or test was changed to conceal it.

The final `dotnet build UA.slnx -c Release --no-restore -m:1` with
`CustomTestTarget=net10.0` succeeded with **0 warnings and 0 errors**.
Whitespace verification passed for all hand-reconciled files, and staged
source hashes match the validation inputs.

These are merge-specific checks, not a new full platform/native/soak
acceptance
sign-off. Earlier review and acceptance evidence below remains dated to
its
own commit.

## Previous upstream merge (2026-09-14)

Merge `c3e09553e4d1509502d4ba751960d58491bea2cf` integrates `master`
through `6313e38a0` (#4478),
including the CTT-driven Part 13 aggregate corrections and FindAlias
argument
validation. The upstream tests and CTT documentation are retained.

The single conflict in `AliasNameWildcardMatcher` is reconciled through
the
branch's shared regex compiler: upstream malformed-pattern rejection and
`IsValidPattern` coexist with OPC UA character escaping,
whole-string/newline
matching, the 100 ms timeout, and service-level error reporting. The
upstream
ReferenceTypeFilter checks and chronological aggregate behavior are
preserved.

Local merge verification:

| Suite / selection | Framework | Passed | Existing skips |
| --- | --- | ---: | ---: |
| Server aliases, aggregates and historian | net10.0 | 1,011 | 0 |
| Server aliases, aggregates and historian | net48 | 1,011 | 0 |
| InformationModel aliases | net10.0 | 54 | 5 |
| Features aliases | net10.0 | 11 | 0 |
| Client aliases | net10.0 | 28 | 0 |
| History aggregate/historical-access consumers | net10.0 | 265 | 0 |

All selected tests passed at normal concurrency. The final net10
solution
build passed with 0 errors and 0 warnings.
The resolved file's whitespace check and the staged diff check passed.
These
are merge-specific checks, not a new full platform/native/soak
acceptance claim.

## Previous upstream merges

Integrates `master` through `8e874d073`, including the Client, Types,
Core and
source-generator audit fixes in #4471, #4473, #4474 and #4475, plus the
event queue-size revision from #4480. The merge commits are `150ea0439`
(26 conflict resolutions) and `a0e17c07c` (the base update that arrived
during
validation).

The overlapping fixes are reconciled rather than replacing either
branch:

- **Rejected-certificate retention follows this branch, as explicitly
requested:**
zero means unlimited history; negative values disable new storage while
preserving existing backend trimming behavior (Directory clears prior
history;
shared key/value leaves it intact). The processor and manager policy are
not
  redefined, and documentation/tests describe the distinction.
- Preserve owned certificate snapshots and borrowed validation-core
lifetimes
  alongside upstream cache invalidation, store-first CRL checks and
  `BadCertificateRevocationUnknown` for unsupported revocation lookup.
- Combine exactly-once chunk ownership, receive-loop cancellation,
stale-epoch
rejection and detach-before-adoption with upstream
signature-before-padding
  verification and secret cleanup.
- Preserve pooled `HttpClient` per-request configuration together with
bounded
response reads and deadlines that remain active through body
consumption.
Regression cases exercise already-used clients and both timeout
precedence cases.
- Retain the binary-compatible channel-key constructor and normalize
omitted
profiles; preserve exact profile filtering and upstream binary-first
HTTPS/WSS
  endpoint ordering.
- Preserve monotonic lease expiry and stale-confirmation fencing while
adding
ordered, non-reentrant leadership notifications outside the state lock.

## Validation

Local validation of the conflict-resolution merge:

| Suite | Framework | Passed | Existing skips |
| --- | --- | ---: | ---: |
| Core | net10.0 | 4,940 | 88 |
| Client | net10.0 | 2,278 | 0 |
| Server | net10.0 | 6,088 | 5 |
| Types | net10.0 | 10,394 | 1 |
| SourceGeneration.Core | net10.0 | 3,940 | 8 |
| SourceGeneration | net10.0 | 185 | 0 |
| Core | net48 | 4,855 | 104 |

After the subsequent four-file #4480 update, the related Server slice
passed
811 tests with 5 existing skips, the real durable queue-size cases
passed 6/6,
and EventManager's 21 cases passed again after analyzer-only
expected-array
cleanup. The final `dotnet build UA.slnx -c Release` with
`CustomTestTarget=net10.0`
succeeded: 0 errors and 4 pre-existing CA2249 warnings in unchanged
fuzz-test
code. Whitespace verification passed for the resolved files and the
follow-up.

Merge-specific proof includes
`RequestTimeoutRemainsActiveWhileReadingTheOpenApiBodyAsync` on
already-used
shared clients with either the request or HttpClient timeout shorter,
the
existing ownership/expiry regressions from both branches, and both
branches'
retention tests adjusted only to the explicitly chosen zero/negative
contract.

Earlier acceptance at `1c4a9df6c` passed hosted Linux/macOS CI, CodeQL,
image
builds and the canonical coverage gate (87.15% line, 77.27% branch,
92.14% patch).
Both Framework project matrices, all three Windows native suites (183
cases),
and the unfiltered net10 stress project (230 cases, including full
60-minute
chaos and 30-minute memory soaks) also passed. Those are **pre-merge
results**,
not a claim that the full framework/platform/native/soak matrix has been
rerun
on this merge. The previous acceptance workflow remains separate from
this
review-feedback operation.

Security checks, meaningful assertions, leak detection, default native
concurrency, full soak durations and coverage thresholds remain intact.
The user-set ready-for-review state is unchanged. No architectural or
complete
merged-head acceptance sign-off is claimed.

## Related Issues

- Fixes #4476

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.
2026-09-16 04:42:09 +00:00
5362ec5e5f Fix the Opc.Ua.Types defects found by the read-only audit (#4474)
# Description

Fixes the defects a read-only audit reported against `Opc.Ua.Types` at
a05a36055: 98 of its 99 findings for `Variant`/`TypeInfo`, the
identifier types, the four codecs, `NodeState`/`Nodes`,
`Schema`/`Utils`/`Polyfills` and the WoT binding, plus **21 further
defects found while reviewing those fixes** — several of which were
regressions the first pass introduced. Every fix carries a regression
test that fails without it.

`Opc.Ua.Types` is the lowest-level assembly in the stack, so most of
these are silent wrong answers in code every other project sits on
rather than crashes.

## The higher-impact ones

**`Variant` equality, hashing and ordering.** `ValueEquals` and
`CompareTo` — the ContentFilter comparison surface, whose only consumer
is `FilterEvaluator` — now convert between numeric built-in types as
Part 4 §7.7.3's implicit-conversion and data-precedence rules require.
`Variant.Equals` deliberately does **not**: it stays strict on
`BuiltInType`, so it remains consistent with `GetHashCode` and safe as a
`Dictionary`/`HashSet` key. `GetHashCode` read
`Float`/`Double`/`Enumeration`/`DateTime` through the wrong union field
and hashed byte arrays by reference, so equal values hashed apart.
Comparing a null variant against a typed one gave a different answer
depending on which side it was written on; that is now decided once and
symmetrically, and a numeric or boolean zero stays *unequal* to a null
variant — letting it compare equal collapsed both into one bucket of
every `Dictionary`/`HashSet` keyed on `Variant`, made `Equals`
intransitive, and made a `HashSet`'s count depend on insertion order.
`CompareTo` reports an unrelated pair as not comparable instead of
ordering it by raw union bits, and the comparison operators now reject
that sentinel — reading `int.MinValue` as an ordinary negative result
made both `a < b` and `b < a` true, which `OrderBy` detects and throws
on.

**`NodeId.CompareTo` was not transitive.** The null case reported "less
than" in both directions for every identifier shape except a
namespace-zero numeric id, so a `SortedSet<NodeId>` could not find a
`NodeId.Null` it had just inserted.

**Encoding limits.** `MaxStringLength` counts the **bytes** of the
encoded string (Part 3 §5.6.4, Part 5 §6.3.2). The XML codecs counted
UTF-16 code units, so one message context gave two answers and a string
a binary peer rejects survived an XML round trip. The measurement now
lives in a single `EncodingLimits` helper, replacing three separate
copies across the codecs. The JSON decoder additionally enforces the
array, byte-string and string limits it never had — including on the
base64 and shorthand spellings that bypassed the checks entirely, so a
peer could opt out of a limit just by choosing the other legal encoding.
An encoding-limit breach is also no longer downgraded into a successful
decode that keeps the raw over-limit body.

**`Node.Write` threw out of a status-code API.** The attribute type gate
compared built-in types only, which does not separate a scalar from an
array, so an array value passed and the unconditional cast behind it
threw `InvalidCastException` out of a method contracted to return a
`ServiceResult`. It now compares the value rank too, and the structured
permission attributes became writable at all (their data type has no
built-in type, so the gate had rejected every value).

**`CoreUtils.Match`.** Rejects an unmatched trailing character without
breaking the single-character wildcard — an earlier version of this fix
made every pattern ending in `?` return false, which no existing test
covered.

Spec conformance was checked against Part 3, 4, 5 and 6 for each
behavioural change: implicit conversion and data precedence (4 §7.7.3),
`NumericRange` BNF (4 §7.27/A.3), `returnDiagnostics` bits (4 §7.32),
`MinimumSamplingInterval` as a `Duration` (3 §5.6.2), `ServerIndex` as
UInt32 (6 §5.2.2.10), DateTime UTC (6 §5.3.1.6), Union `SwitchField` (6
§5.2.8, §5.3.7, H.10), and the verbose JSON Enumeration form (6
§5.4.4.2).

## Reviewer notes

- **One deliberate behaviour tightening.** XML with more than
`MaxStringLength` non-ASCII *bytes* is now rejected where it previously
passed on *character* count. Nothing in the repo's fixtures trips it,
but it is a real narrowing for a deployment with a low `MaxStringLength`
and non-ASCII display names.
- **One finding deliberately left open.** `NodeState.Initialize` still
does not carry over the optional storage that `CopyTo` copies. It
instantiates a node from a prototype rather than cloning it, and
propagating the prototype's `RolePermissions` makes the GDS
certificate-group nodes unreadable for users that could read them before
(`CustomCertificateGroupNodeExistsInAddressSpaceAsync` fails with
`BadUserAccessDenied`). Whether an instance inherits its prototype's
permissions is a security decision for the address space, so the
omission is now documented in place rather than quietly closed. Happy to
split it into its own issue.
- **Nine existing tests were updated** because they pinned the buggy
behaviour. Each is worth a look:
`EqualsWithDifferentNumericTypesReturnsFalse` asserted the opposite of
Part 4 §7.7.3 and was renamed with a replacement negative case;
`XmlElementGetHashCodeShouldReturnCorrectHashCode` pinned the textual
hash that broke the `Equals` contract; the `CompareTo`-versus-null cases
in `NodeIdTests`/`ExpandedNodeIdTests` asserted the non-antisymmetric
answers; three `DateTimeUtcTests` parse cases depended on the local time
zone.
- 21 of the fixes (5,558 insertions across 74 files) came out of an
adversarial review of the first pass, with each candidate independently
verified against the built assembly rather than by inspection — the
`Variant` null-equality, `NodeId.CompareTo`, `Node.Write`,
`CoreUtils.Match` and JSON-limit items above are all in that group.

## Related Issues

No tracking issue exists — this came from an internal read-only audit
rather than a reported defect. Happy to open one, or to split the WoT,
encoder and `Variant` groups into separate issues if the maintainers
prefer that shape for a change this size.

- Fixes #

## Checklist

_Put an `x` in the boxes that apply. You can complete these step by step
after opening the PR._

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

### Notes on the checklist

- **Tests:** every fix has a regression test; 9 new test files, ~130 new
test cases. Several were verified discriminating by temporarily
reverting the production line and confirming the test fails.
- **Warnings:** full `UA.slnx` build is clean, and `dotnet format
whitespace --verify-no-changes` reports the same 101 pre-existing
findings in the same file set as an unmodified worktree at the same
commit — none in changed files.
- **Test runs:** all suites were run on **net10.0 only**, so that box is
left unchecked pending a .NET Framework run: Types 10374, Core 4490,
Core.Encoders 2929, Core.Schema 157, Configuration 227, Server 5540,
Client 2217, Gds 1117, PubSub 1369, WotCon 1496, ComplexTypes 2773,
InformationModel 1080, Di 425 — all passing, 0 failures. Two failures in
`Core.Diagnostics.Tests` and `OpenUsd.Tests` are pre-existing on master
and caused by a German locale decimal separator, confirmed against a
clean baseline worktree at the same commit.
- **Documentation:** no separate docs; the new and changed members carry
XML doc comments explaining the spec clause behind each behavioural
decision.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
2026-09-14 08:25:02 +02:00
Marc Schier 2d9088119b Fix alias startup ordering and retained translation fallbacks (#4469)
# Description

Complete the two P2 follow-up fixes identified during review of #4456.

- Copy alias stores after application `IServerPreStartupTask`
registrations finish, but before address-space creation. This preserves
stores initialized asynchronously during startup, for both the default
DI server and compatible custom servers. Task ordering, once-only
execution, failure/cancellation behavior, and opt-in snapshot
materialization remain intact.
- Preserve the original `TranslationInfo` fallback locale, template,
key, and arguments while rendering the selected translation. Retained
values and service results can be translated for another session without
losing their original fallback.
- Keep selected templates unformatted until rendering, use the selected
locale for formatting, retain metadata through locale filtering, and
avoid double-formatting escaped braces during single-language
conversion.
- Add deterministic alias initialization and translation regressions,
extend native hosting coverage, and update the feature documentation.

Public signatures and `LocalizedText` struct layout are unchanged. No
dependencies, migration-guide changes, CI settings, or
coverage-threshold changes are introduced.

## Related Issues

- Related to #4410.
- Follow-up to the two P2 review findings in #4456.

## Validation

The new regressions failed before the relevant fixes and pass afterward.

| Scope | net10.0 | net48 |
| --- | --- | --- |
| Complete Types test project | 10,265 passed; 1 existing skip | 10,255
passed; 1 existing skip |
| Affected hosting, aliases, resources, and configuration tests | 561
passed | 561 passed |
| Existing real-session alias integration tests | 11 passed | 11 passed
|

- Built the affected libraries across all configured target frameworks
with **0 warnings and 0 errors**.
- Published and ran the actual Windows NativeAOT test executable: **7
HostingAotTests passed**, including initialized alias registries and
English-to-German-to-English fallback preservation. Local compilation
used `IlcSingleThreaded=true` after a parallel compiler attempt
exhausted host memory; repository settings are unchanged.
- Focused coverage: **28/29 changed executable production lines
(96.55%)**.
- Changed-file formatting and diff checks pass.

The results above are the stated local project/filtered runs, not a
complete local `UA.slnx` test run. Remote CI and CodeQL results are
pending.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.
2026-09-11 14:28:46 +02:00
0e600c0f0b Fix hosted-server DI composition gaps (#4456)
# Description

Complete the remaining hosted-server DI hooks so applications can
compose the regular server without subclassing `StandardServer` solely
for these extension points.

- Add `ConfigureServerProperties` and ordered, per-server
`ConfigureResources` callbacks. BuildInfo defaults come from the
effective application configuration; explicit property registrations
take precedence without mutating shared options.
- Add authenticator instance/validator-aware factory overloads and
generic/async-delegate startup tasks. Startup tasks are awaited in
registration order, and failures or cancellation clean up the server.
Host shutdown waits for execution cleanup before disposing injected
dependencies, including when its shutdown deadline expires.
- Add asynchronous and legacy node-manager factory instances plus
deferred, configuration-aware `ArrayOf<IAsyncNodeManagerFactory>`
registrations. Resolve factories after configuration and certificate
setup while preserving ownership and feature isolation.
- Register alias stores before address-space creation and add opt-in
standard `TagVariables`/`Topics` materialization. Existing
custom-category behavior is retained; browse nodes are startup snapshots
while queries and supported LastChange values remain live.
- Derive the default DI server from `ReverseConnectServer`, retaining DI
roles/session hooks and authoritative XML/stream configuration. Ignore
queued callbacks from stopped or superseded timers to prevent
reconnection or rearming after shutdown.
- Fix resource translation lookup/formatting exposed by the new
callbacks, retain existing constructor signatures and
direct/custom-server paths, and document the optional hosting APIs.

Adopting these hooks is optional; existing construction and
subclass-based customization remain supported. The migration guide is
unchanged.

No changes to UA-.NETStandard-Samples and no new dependencies.

## Related Issues

- Fixes #4410

## Validation

- Focused server hosting, aliases, reverse-connect, configuration, and
resource suites: **571 passed on net10.0 and 571 passed on net48**.
- Existing affected real-session alias integration fixtures: **11 passed
on each framework**.
- Real reverse-connect discovery, session creation, and BuildInfo reads
verified for options, XML-file, and stream configuration.
- Published and executed the Windows NativeAOT test binary: **7
HostingAotTests passed**.
- Final server-library build passed across all configured target
frameworks with **0 warnings and 0 errors**; no new diagnostics in
changed test files.
- Focused changed-line coverage: **336/338 executable production lines
(99.41%)**.
- Deterministic timer regressions failed before the shutdown fix and
pass afterward.
- CI shutdown follow-up: the unchanged
`UnavailableUpstreamEndpointFailsMappedReadAsync` scenario passes
locally, and **245 hosting tests pass on each of net10.0 and net48**,
including regressions for an expired host shutdown deadline and
already-canceled startup. The local net48 run uses a short NUnit work
directory to avoid Windows path-length limits.

## Azure build 18136 follow-up

- Await WoT browse reconciliation before upload, default-version, and
enable/disable handlers return. Three barrier-controlled regressions
reproduce the exact missing version metadata before the fix.
- Make the reconciliation test observe the actual corrective state frame
rather than require a new acknowledgement after a no-op reseed. The
corrected tests also verify value, status, timestamp, and quiescence;
production gossip behavior is unchanged.
- Drain redirected stdout/stderr when sample processes exit, replacing a
fixed grace delay that could lose the final success line. A controlled
real-process regression fails before the fix.
- Fix CA1508, CA1823, CA1850, CA2012, and CA1861 at their sources, and
correct unsupported legacy AOT declarations and the existing
stress-placeholder target. Modern test targets and AOT analysis remain
enabled.

Follow-up validation:

- Full **Release `UA.slnx` builds pass on net10.0 and net48 with 0
warnings and 0 errors**.
- Complete previously failing WoT net48 job: **1496 passed**. The
identical binary was run from a short local assembly path to avoid the
nested repair worktree exceeding Windows path-length limits.
- Complete previously failing Redundancy.Server net10.0 job: **783
passed**.
- All short-haul HA/process cases: **12 passed**, including both
original identity-failover topologies.
- Affected WoT lifecycle selection: **113 passed on Release net10.0**;
controlled replication selection: **15 passed on each framework**.
- No test assertions, timeouts, coverage thresholds, collector settings,
or CI failure gates were weakened. Existing legacy empty-project result
notices and auto-property coverage exclusions remain unchanged.

These are full solution builds plus the reported test scopes, not a full
local `UA.slnx` test run.

Remote validation at `77c1055f1adb1557c5bf99b70e76f4a0cd95ee94`: **all
265 PR checks passed**, including Azure build **18172**, GitHub Build
and Test, CodeQL, and Docker image checks.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [x] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

---------

Co-authored-by: romanett <romanett98@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-09-10 05:56:52 +02:00
Marc SchierandCopilot Autofix powered by AI 7d5f7a7076 Add shared stack APIs and fixes used by UaLens (#4464)
# Description

Extract shared stack, regression-test, sample and documentation changes
from draft #4462 into a separate prerequisite PR. The PR now contains
**19 shared paths**: the original eighteen extracted files plus a
focused user-management regression file added during review. It does not
include UaLens source, desktop dependencies, solution registrations or
application documentation.

## Changes

- Correct the V2 ConditionRefresh target and response validation. Bound
disposal-time remote subscription deletion with an independent
five-second TimeProvider-backed cancellation deadline, allowing local
cleanup after a server outage. This is a per-delete limit, not a global
application shutdown deadline.
- Preserve configured PubSub writer message/header settings, canonical
numeric JSON publisher matching, and flattened DataValue
quality/timestamps.
- Add asynchronous user-management client wrappers over the generated
standard proxy, and set file/directory method declaration IDs needed by
typed client workflows.
- Enable AI client NativeAOT compatibility and add focused AI client
regressions.
- Enable the ConsoleReferenceServer file-system node manager and
configure 1 ms publishing/sampling demonstrations. These sample defaults
do not promise hard real-time delivery.
- Document the subscription and PubSub behavior. Make the new
subscription/PubSub regression helpers portable to .NET Framework
without weakening their assertions.

## Review follow-up

Commit `812297ce1` aligns both public `ListUsersAsync` signatures with
`ValueTask<ArrayOf<UserManagementUser>>`. The implementation constructs
its result directly from an owned snapshot array, without an
intermediate list.

Five focused cases pass on **net10.0 and net48**:
`ListUsersReturnsArrayOfSnapshotsAsync` checks both interface and
concrete entry points and preserves snapshot order, values and flags;
`ListUsersReturnsEmptyArrayAsync` covers typed-empty and missing values;
`ListUsersPreservesBadReadStatusAsync` checks the exact server failure
status.

All **eight single-line XML summaries** were converted to multi-line
form. A complete scan of the fourteen changed C# files, including the
new test, finds zero remaining single-line summaries. Scoped
whitespace/line-ending verification passes.

The sole UaLens caller was adapted separately in draft #4462
(`4caf69f33`). A fresh combined dependency-graph build and all **924
UaLens net10.0 tests** pass with both changes. Each of the three review
threads received an action-taken reply and was resolved only after the
fixes were pushed and verified.

## Split boundary

The branch originated at `a45105375`; the subsequent master merge
`f209f3804` incorporates upstream `4633aa7a3`. The original shared
changes and review regression remain separate from the app. Draft #4462
retains `tools\Opc.Ua.Lens`, `tests\Opc.Ua.Lens.Tests`, and its six
solution/package/documentation integration files.

**Merge this prerequisite before the UaLens draft.** The draft consumes
the extracted APIs. Published history is preserved; neither PR has been
merged automatically.

## Initial split validation

The following results describe the initial split validation at
`fa7199afa`; current review-specific validation is recorded above.

| Scope | net10.0 | net48 |
|---|---:|---:|
| Client subscription/file-system tests | 168 passed | 168 passed |
| Server file-system/user-management tests | 244 passed | 244 passed |
| PubSub writer/reader regressions | 34 passed | 34 passed |
| ConsoleReferenceServer build | Passed | Passed |

The corrected portable regression helpers were rechecked on net10.0
after the net48 fixes. The combined UaLens application also passed its
924-case net10.0 suite before extraction.

**Focused NativeAOT: 16 passed, zero failed/skipped.** A session-local
TUnit runner linked the exact committed `AIClientAotTests.cs` and
referenced the real AI client project. It published without warnings or
suppressions and executed as a genuine Windows native binary with no CLR
header.

The canonical `Opc.Ua.Aot.Tests` project was blocked by pre-existing
CS8632 nullable-annotation errors in unchanged upstream
`SchemaAotTests.cs` (lines 82, 127, 129 and 132). Its existing nullable
configuration and all upstream tests were preserved; the focused result
is not a claim that the full AOT test project builds.

The net48 hosting selection uses a short NUnit WorkDirectory: the
existing fixture builds long PKI paths that otherwise exceed the
platform's path limit. The original full selection passed without test
exclusions, source changes or increased timeouts.

Scoped builds reported inherited warnings in unchanged upstream files:
CA1508 in `ReferenceBuilderExtensions.cs`, CA1861 in
`NodeSetImportIntegrationTests.cs`, and net48 CA1823 in
`DefaultNodeIdFactory.cs`. They were not suppressed or folded into this
split. Full-solution, coverage and CI/CodeQL gates remain unasserted.

## Related Issues

- Tracking/design review: #4461.
- Prerequisite extracted from draft #4462.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [ ] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

Tests and scoped results are documented above; measured coverage,
inherited-warning qualification, CLA status, full-solution results and
CI completion are not asserted by these checkboxes.

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-09-09 19:22:06 +00:00
Marc SchierandCopilot d08d4faec1 Reduce NodeState allocations and pack scalar Variants (#4452)
# Description

Consolidate the complete B01/B02 NodeState memory work into one PR.

- Replace eager cold-path NodeState locks with lazy canonical
publication and update
  the event-monitor counter atomically.
- Store six design-metadata properties and three security properties in
separate lazy
private bags while preserving public APIs, null/empty distinctions,
masks, copying
  and existing serialization behavior.
- Avoid allocating the ReportEvent scheduling closure when the
async-dispatch path is
  unused.
- Retain the logger factory's category logger directly, avoiding a
redundant typed
  wrapper on telemetry initialization.
- Keep Variant at 24 bytes while removing eligible outer boxes for
QualifiedName,
  NodeId, NET8+ ByteString and text-only LocalizedText values.
- Add reproducible allocation/layout/occupancy fixtures, real registered
and monitored
populations, reference contracts, generated-consumer coverage and
NativeAOT cases.

## Measured allocation changes

Matched .NET 10.0.11 x64 observations against the integrated master
baseline:

| Construction/assignment | Master | This PR |
|---|---:|---:|
| Bare/minimal object | 824 B | 640 B |
| Bare/minimal variable | 1160 B | 976 B |
| Variable with both optional groups populated or reset | 1160 B | 1088
B |
| Variable with a shared ByteString value | 1192 B | 976 B |

Separate paired measurements show:

- telemetry initialization: 24 B typed-logger wrapper removed;
- eligible QualifiedName, NodeId and ByteString Variant construction: 32
B to 0 B;
- eligible text-only LocalizedText Variant construction: 40 B to 0 B;
- variable attributes read into caller-provided Variant destinations:
136 B to 0 B.

These are runtime-specific per-operation observations, not additive
whole-server
savings. Optional bags retain their documented populated/high-water
premiums and are
not reclaimed on reset.

## Reference-storage decision

A complete private indexed reference backend and a sorted-traversal
alternative were
measured, but both changed the existing filtered hash-index enumeration
order. They
were rejected despite lower memory use. The production reference backend
remains
unchanged; strengthened ordering, identity, serialization and
concurrency contracts
are retained. Adaptive small-set storage remains deferred.

## Consolidation

This PR now contains all changes from #4451 and the former narrower
#4452 branch.
Every #4452 changed path was present in #4451; after merging, the #4451
head
`836e45226` is a direct ancestor of this branch. #4451 is closed as
superseded.
Draft #4425 remains unchanged and is also superseded by this
consolidated work.

## Review feedback

- Removed the standalone Variant storage document and its README entry.
- Made the raw NodeId constructor private; the documented internal
`GetRawState`/`SetRawState` bridge is explicitly Variant-only and must
never become
  public.
- Marked the two 32-thread counter tests non-parallel.
- Added 10-second timeouts to the concurrent browse benchmark's main and
worker
  barriers and completion waits.
- Migrated the registered-population fixture to the current async
`SealAsync` API.

All review threads on #4451 and #4452 were replied to with the action
and fix commit,
then resolved.

## Related issues

- Related to #4275.
- Supersedes #4425 and #4451.

## Validation

- Consolidated Types/Core/Server selection: **1241 passed** on net10.0.
- Consolidated Types/Core/Server selection: **1238 passed** on net48.
- Focused #4451 feedback selection: **189 passed** on net10.0 and **187
passed**
  on net48.
- Earlier integrated NativeAOT validation passed **163/163** cases
across the main,
MCP and Historian applications; current PR CI provides the authoritative
final
  merged-source native validation.

The first #4452 CI run was blocked by merge conflicts. Seven later jobs
completed
their tests but encountered a shared artifact-service HTTP 403 while
uploading
results; no workflow or test was weakened to mask that infrastructure
failure.

Generated `report.*.json` crash artifacts remain untracked and are not
part of this PR.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove the changes and improve coverage.
- [x] I have added the necessary current-behavior documentation.
- [ ] I have verified that the fresh consolidated CI run introduces no
build or analyzer warnings.
- [ ] I ran the complete UA.slnx suite locally on net48 and net10.0 with
no failures.
- [ ] I fixed all failing and flaky CI tests and all CodeQL warnings.
- [x] I have addressed all PR feedback received.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: d2569e2e-7115-4969-bb44-8159e302b450
2026-09-09 16:48:13 +02:00
Marc SchierandCopilot 7411654c8d Complete OPC UA Part 11 Historical Access (#4390)
# Description

Completes the OPC UA Part 11 Historical Access work requested by #4387
and
the historian framework integration requested by #4400.

The conformance/evidence catalog covers all 37 released UACore 1.05
Historical Access profiles: 15 Server facets and 22 Client facets,
together
with the standard aggregate functions and their conformance units.
Server
facets are advertised only when the resolved providers expose their
required
interfaces and capabilities.

## Server and provider support

- Completes raw, modified, at-time, processed, annotation, structured,
and event history.
- Dispatches best-effort, bulk, and transactional updates with aligned
statuses, old values, diagnostics, and rollback state.
- Supports mixed history-update detail types and batched
structured/annotation operations.
- Uses composite identities and exclusive cursors for same-timestamp
structured, modified, and event values.
- Captures live data and events, installs historical configuration
objects, and emits typed audit payloads.
- Derives aggregate monitoring filters from per-node historian
capabilities and rejects unsupported processed aggregates before
provider dispatch.
- Supports tri-state `Historizing`: set, clear, or preserve
provider-owned state.

## Client support

- Exposes modified values together with `ModificationInfo`.
- Adds event-history reads and event insert/replace/update/delete
operations.
- Adds structured and annotation batching with strict response
validation.
- Shares continuation handling and release-on-abandon across read
families.
- Accepts inherited standard event fields rooted at event subtypes.

## Review hardening

- Registers DI-selected historians before node-manager reconciliation
and capability publication, while preserving provider ownership.
- Uses committed Raft read barriers for linearizable `TryGetAsync` and
`ScanAsync`.
- Keeps claimed continuation state immutable until a fresh successor is
saved, restoring the original after transient failures.
- Uses exact-incarnation compare-and-delete so delayed cleanup cannot
remove a restored same-ID continuation.
- Cleans up indeterminate initial and replacement saves, and propagates
shutdown cancellation through cleanup resolution.
- Preserves legacy continuation envelopes/cursors and distinct
annotation parent/property identities.
- Deletes every structured entry at a requested timestamp and uses the
complete modified-history ordering tuple.
- Shares native/fallback at-time and AnnotationCount calculations,
including reverse endpoints and cross-framework fractional intervals.
- Primes modified aggregate items before buffered live delivery and
deduplicates history/live overlap using provider-specific identities.
- Keeps committed Modify results successful while reporting priming
failures
  through the monitored item's notification queue.
- Keeps protected-notification state live-only for queues larger than
one.
Queue size one retains the newest notification without pinning errors or
transferring priority during resizing. Durable restore retains ordinary
definitions, last values/errors, and raw queues without recreating
priority.
- Isolates aggregate calculation, modification preparation, and
historical/live
handoff in `AggregationFilterHandler`, retaining existing
provider/factory
wiring and supported past-start behavior. The larger-queue protection
policy
  is unchanged pending the open review discussion.
- Uses one `IMonitoringFilter` owner for protocol filters or the
aggregation
handler, eliminating parallel effective-filter storage and retaining the
current definition during preparation. The original client filter stays
distinct.
- Integrates current master, retaining custom monitored-item creation
decisions and per-node history callbacks.

## Redundant-server alignment and samples

- Adds a protected shared historian with immutable segments, manifest
CAS publication, writer fencing, and restart recovery.
- Persists portable continuation state before exposing it to clients and
transfers ownership during mirrored-session takeover.
- Rejects eventual-consistency and active/active multi-writer historian
configurations rather than silently degrading.
- ReferenceServer and ConsoleReferenceClient demonstrate discovery,
paging, raw/modified/at-time/processed reads, annotation/structured
CRUD, event capture, and event CRUD.
- RedundantServer and RedundantClient demonstrate active/passive
history, continuation recovery after replica termination, and
post-promotion writes.
- Updates Historical Access, High Availability, profile, migration, and
sample documentation.

## Compatibility

- New 2.0 collection boundaries use `ArrayOf<T>` and public byte
payloads use `ByteString`.
- Removes the legacy public virtual
`SamplingGroupManager.CreateMonitoredItem` /
`ModifyMonitoredItem` entry points and protected creation factory, as
agreed
  in review. Migration guidance points to the monitored-item manager and
  construction-decision APIs.
- Retains established persisted formats and current write layouts.
Retired interim
notification-state formats (sample v2 / shared v4) are rejected, as
agreed in review.
- Keeps the historian integration compatible with .NET Framework and
NativeAOT.

## Validation

### Latest CI source repair

`73c619435` forwards the existing cancellation token at both
predefined-node
creation calls in the PR-added History event fixture. The merged
lifecycle
overload exposed these two CA2016 errors, which blocked History jobs,
the
solution build matrix, and CodeQL on GitHub and Azure. The exact
compiler
failure was reproduced locally; the repaired fixture passes 4/4
integration
cases on net10.0 and 4/4 on net48 with clean scoped diagnostics. No
assertions,
tests, coverage thresholds, or CI configuration were weakened.

The repaired History jobs on Linux/macOS and all four Azure solution
builds
now pass. The Windows all-TFM GitHub job instead lost its hosted
runner's
connection; no build log was recoverable, and GitHub recorded a
runner-loss
annotation rather than a compiler/test diagnostic. One unchanged retry
was
requested. Remaining checks are monitored with
`gh pr checks --watch --fail-fast --interval 30`; CI is not yet reported
as green.

### Latest base integration

`bd52e5fea` merges upstream `master` at `da7412c42`. The lifecycle
conflict
retains upstream's shared cancellation-aware registration helper and the
historian behavior. The hosted-historian fixture forwards its existing
token
to the new lifecycle overload. GDS project renames and all three AOT
test
hosts are retained, with their project references resolving after the
merge.

| Integrated scope | net10.0 | net48 |
| --- | --- | --- |
| Server lifecycle, fluent authoring/import, historian, monitored-item
and hosting regressions | 732 passed | 732 passed |
| NodeState lifecycle regressions | 216 passed | 216 passed |
| Automatically merged Raft client fixtures | 28 passed | 28 passed |

No selected tests failed or were skipped. The manually resolved files
pass
scoped formatting/analyzer checks. One CA1861 warning remains in the
incoming
`NodeSetImportIntegrationTests.cs`; that file is byte-identical to
upstream
master and was not rewritten or suppressed during integration.

### Latest feedback follow-up

`102954eaa` replaces split filter references with the shared
`IMonitoringFilter`
contract implemented by protocol filters and `AggregationFilterHandler`.
Targeted server regressions pass **103/103 on net10.0 and 103/103 on
net48**;
scoped formatting/analyzers are clean, and the updated XML-documentation
inventory has zero gaps across 188 non-generated PR C# files.

`93c5b5db8` renames `AggregationFilterHandler`, makes it the owner of
the
server-revised aggregate filter while preserving the original client
filter,
and removes the retired interim notification-state readers. Server
regressions
pass **101/101** and shared-store regressions **64/64**, on both net10.0
and
net48, with no failures or skips. Runtime-file formatting/analyzers are
clean.

`5ccf45630` completes the public/internal XML-documentation sweep. The
Roslyn
inventory finds zero undocumented eligible declarations across all 186
non-generated PR C# files; the 110-file documentation slice changes only
XML
comments and spacing. `f17765475` applies the three requested Markdown
edits.

### Earlier feedback follow-ups

`a53950737` removes single-slot notification pinning and extracts
aggregate
implementation from MonitoredItem. Targeted sampling, aggregate
modification,
history/live handoff, queue/lifecycle, restore, and serialization cases
pass
**101/101 on net10.0 and 101/101 on net48**, without failures or skips.
Scoped formatting/analyzers are clean; the focused review found no
significant
issues. The final formatted monitored-item fixtures also pass 45/45 on
net48.

The preceding `b21555568` removes the legacy sampling API bridge and
durable
notification-priority state. Its targeted Server cases passed 97/97 and
shared
subscription-store cases passed 64/64 on each framework. The broader
evidence
below remains pinned to its original tested commit, not attributed to
these
follow-ups.

### Earlier integrated-implementation validation

Validated implementation commit: **`3efae597f`**. The following commit,
`f6dbefb1c`, only adds two explanatory comment lines for the final
standards
review; it changes no executable code.

| Scope | net10.0 | net48 |
| --- | --- | --- |
| Server | 5,187 passed; 56 skipped | Affected surface: 2,160 passed; 1
reproduced baseline failure; 56 skipped |
| Client | 2,202 passed; 2 skipped | 2,204 passed; 5 skipped |
| History integration | 519 passed; 21 skipped | 519 passed; 21 skipped
|
| Redundancy server | 641 passed | 641 passed |
| Redundancy client | 124 passed | 124 passed |
| Core shared-store regression suite | 23 passed | 23 passed |

All six affected samples passed non-incremental Release/net10.0 builds
with
zero warnings and errors: ConsoleReferenceClient,
ConsoleReferenceServer,
RedundantServer, RedundantClient, MinimalBoilerServer, and
PumpDeviceIntegrationServer.

The published self-contained win-x64 NativeAOT executable is 116,924,928
bytes and has no CLR header or managed runtime dependency. Direct
execution
passed **HistoryAotTests 3/3** and **RaftAotTests 2/2**.

Final standards and specification reviews found no confirmed outstanding
high/medium functional gaps or hard standards violations. The remaining
constructor-purpose clarification is addressed in `f6dbefb1c`.

### Reproduced baseline exceptions

The net48 hosted-startup timeout also reproduces in a pristine worktree
at
the previous PR head, `24cf1416d`, in

`RegisterPostStartRegistriesWiresHistorianAndAliasStoresOnPlainServerAsync`,
with the same subsequent certificate-leak assertion. The corresponding
renamed case fails before startup in the reviewed branch as well. This
is
reported separately from the net48 affected-surface results, not counted
as
a passing full Server suite. The net48 matrix selected the historian,
aggregate, monitored-item, fluent, and continuation surfaces and
excluded
the Hosting namespace.

`DurableDataValueQueueVerifyReferenceBatchingAsync` failed at item 1000
in
the net48 affected-surface run and passed its single isolated rerun. The
same
failure at the same assertion reproduces on pristine `849e16acc`; the
test,
sample queue, queue factory, and batch persistor are unchanged. The
original
failure remains in the table rather than being erased by the rerun.

### CI source repairs

- `4be7eb8f7` keeps diagnostics/configuration managers out of
distributed
address-space replication. Those managers inherit the source interface,
but their live server state and redundancy metadata must remain
replica-local.
  The ownership regression passes on net10.0 and net48, and all nine
  redundancy sample CI tests pass locally.
- `d17f467b3` completes the sample startup repair: core managers are
also
replica-local; the startup banner no longer advertises readiness before
initialization; the producer starts after distributed services; and
native
Raft startup no longer forces disruptive extra elections. The full
sample
suite passed 9/9, with initialized `RedundancySupport=Hot`, and focused
  Raft/address-space regressions passed 8/8 and 3/3.
- `81b0b72be` moves the unchanged distributed-historian NativeAOT
scenario
into a smaller, always-run companion executable to bound Apple's linker
input. All 137 AOT tests remain present; the moved test and helpers are
  unchanged. GitHub and Azure publish/run both native executables, with
separate result directories where they share a job. The companion passed
actual Windows NativeAOT execution. Linux and Intel macOS CI passed both
  executables, but this split alone did not fix ARM64 macOS linking.
The remaining historian graph is rooted by ReferenceServer startup, not
just the relocated test. No test exclusion or speculative linker setting
  was added to conceal it.
- `8a5842913` isolates the independent MCP test graph into an always-run
native host. The existing MCP source and assembly leak hooks are linked
  unchanged, and evaluated compiler inputs prove exactly one owner for
  every test source: 133 main + 3 MCP + 1 historian = 137 declarations.
All three hosts run on every AOT platform. The main Windows native
object
is 9.35% smaller; both changed publishes had zero diagnostics. MCP
passed
  3/3; the identical main executable passed 133/133 on one unfiltered
followup after two initial endpoint-discovery connection failures, which
  remain recorded in the local evidence.
- The previous Intel macOS job successfully published and executed its
native
tests, then failed on artifact-upload DNS (`ENOTFOUND`). No upload gate,
  shared environment setting, or cache configuration was disabled.

The first repair round also encountered the unrelated
`MetricsAreEmittedForChannelLifetimeAsync` timing failure on macOS Core.
Neither that test nor channel-manager code is changed by this PR, and
its
assertions remain intact. It passed unchanged on the final repair head.

On `d17f467b3`, the Linux and macOS redundancy sample jobs pass; the
remaining
failure was ARM64 Apple's `too many large addends` assertion. The
verified
upstream relocation-anchor fix (dotnet/runtime#124721, backport
dotnet/runtime#132171) is not present in the shipping ILCompiler
10.0.11.
An experimental multi-module probe failed and was rejected, not added to
CI.
On `8a5842913`,

[`aot-macos-latest`](https://github.com/OPCFoundation/UA-.NETStandard/actions/runs/34102158680/job/101678934057)
successfully publishes and executes all three native hosts on ARM64:
136 main runtime cases, 1 historian case, and 3 MCP cases, with no
skips.
The previous Apple linker blocker is resolved. Linux NativeAOT also
passes.
No assertion, test, shared environment setting, cache, or required gate
was
weakened.

The same CI run reports a separate macOS Sessions teardown failure: all
662 executed tests pass, but the global leak assertion detects one
undisposed certificate. The MCP partition changes no runtime, Sessions,
or
test-fixture code. A single unchanged diagnostic rerun is queued once
GitHub
permits rerunning that job; the failure is not suppressed or counted as
green.
Other CI checks are still pending.

## Related issues

- Fixes #4387
- Fixes #4400

## Checklist

- [ ] I have signed the CLA and read the contributing guide.
- [x] I have added regression tests and directly related documentation.
- [x] I have retained working reference and redundant-server sample
wiring.
- [x] Final validation and review evidence is complete, including the
baseline exceptions above.
- [ ] All required CI checks pass; the fail-fast rerun for `73c619435`
is pending.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 9dbd9527-d818-47a0-984c-fbb1472d3d6b
2026-09-08 11:32:23 +02:00
romanettandClaude Opus 5 30ed2390a8 Import NodeSet2 documents into a fluent node manager (#4432)
## What

`INodeManagerBuilder.Import(UANodeSet, INodeSetImportFactoryProvider?)`
lets a source-generated (or hand-written fluent) node manager overlay a
NodeSet2 document that is only known at runtime onto the model it was
generated from.

Every document imported during one `Configure` pass forms a single batch
that is linked **exactly once** after the pass. A node may therefore
declare a `ParentNodeId` that lives in another document of the batch, or
a node the manager already owns — which is what makes an overlay
possible. Imported nodes resolve through
`Node(...)`/`NodeFromTypeId(...)` immediately, so they can be wired in
the same pass; they are registered with the manager when
`CompleteConfigureAsync` runs.

### Public surface

- **+1 method**: `INodeManagerBuilder.Import(UANodeSet nodeSet,
INodeSetImportFactoryProvider? factoryProvider = null)`.
- **+3 contracts** in `Opc.Ua.Server.Nodes`:
`INodeSetImportFactoryProvider`, `INodeSetImportFactory`,
`NodeSetImportDiscriminator` (TypeDefinition / MethodDeclaration /
NodeId).
- In `Opc.Ua.Export`: a public `UANodeSet.Import` overload taking a
`NodeSetImportStateFactory`, and a public batch
`LinkParentChildRelationships(context, nodes,
NodeSetImportLinkOptions)`. These replace what would otherwise have been
an `InternalsVisibleTo("Opc.Ua.Server")` on `Opc.Ua.Types`.
- `NodeState.IsExplicitlyDefinedChild(context, child)` and `protected
DetachExplicitlyDefinedChild(child)`, used to tell a generated slot
apart from an ordinary child.

### Typed states, no reflection

The generator emits `{Model}NodeSetImportFactoryProvider` — one factory
per model type/declaration, each calling a concrete constructor for an
*empty* state — and makes the generated node manager implement
`INodeSetImportFactoryProvider` by delegating to it. So the builder
resolves the provider from the manager (`NodeManager as
INodeSetImportFactoryProvider`); `Import` also accepts one directly, and
the generated manager exposes `partial void
AddNodeSetImportFactories(List<INodeSetImportFactory>)` for dependency
models. An imported node of a generated type materializes as its
generated `*State` subclass with no type lookup, which keeps the path
NativeAOT-safe.

Because the factories create empty states, an imported instance carries
exactly the children its document declares.

### Reconciliation

When an imported child lands in a slot the generated parent declares
(same BrowseName), it replaces the generated placeholder: the displaced
node and every descendant the document does not carry over are removed
from the manager, and references to them are retargeted at the
replacement. Replacing a node the same `Configure` pass already wired is
rejected with `BadInvalidState` rather than silently dropping the
wiring, and sealing a builder with an unregistered import batch is
rejected too.

### Also

- `RuntimeNodeSetNodeManager` now uses the same importer: its documents
are one batch, so a node may declare a parent in another document of the
group regardless of parse order, and duplicate NodeIds across documents
are detected while parsing.
- Linking resolves an imported child's reference type from its own
inverse reference (previously always `HasComponent`/`HasProperty`).
- Method import keeps the document's `UserExecutable`; it previously
copied `Executable` into it. View import keeps `EventNotifier`.

## Tests

- `NodeSetImporterTests` (15) — discriminator selection, generic
fallbacks, field/value/reference fidelity against a generic import,
cross-document linking, typed replacement of inherited and argument
slots, deferred linking preserving an application `Handle`, duplicate
NodeIds, factory misuse.
- `NodeSetImportBuilderTests` (15) — staging and lookup before
registration, batch linking, attaching to an existing node, provider
resolution, placeholder replacement with reference retargeting,
configured-placeholder rejection, seal/completion guards.
- `NodeSetImportIntegrationTests` (5) — a generated `[NodeManager]`
overlaying its own model on a running server: typed states through the
generated provider, cross-document linking, placeholder replacement, and
browse through a session.
- `NodeManagerGeneratorTests` (+4) — the emitted provider and the
manager's delegation, including that no factory uses
`Activator.CreateInstance`/reflection.
- `NodeSetAotTests` (+1) — the public state-factory import under
NativeAOT.

Full `Opc.Ua.Server.Tests` (4946), `Opc.Ua.SourceGeneration.Core.Tests`
(3821), `Opc.Ua.SourceGeneration.Tests` (165) and `Opc.Ua.Types.Tests`
pass locally on net10.0.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
2026-09-07 23:12:43 +00:00
romanettandClaude Opus 5 1af191ec26 Drop the .Common suffix from the three GDS projects (#4438)
# Description

Every other companion specification in the stack ships as `<Family>`,
`<Family>.Client` and `<Family>.Server` — `Opc.Ua.Di`, `Opc.Ua.ISA95`,
`Opc.Ua.Positioning`, `Opc.Ua.Robotics`, `Opc.Ua.Vision`,
`Opc.Ua.WotCon`, `Opc.Ua.XRegistry`, and `Opc.Ua.Lds.Server` without a
family package. GDS was the one exception, carrying a `.Common` suffix
that named nothing.

| Before | After |
| --- | --- |
| `src/Opc.Ua.Gds.Common` | `src/Opc.Ua.Gds` |
| `src/Opc.Ua.Gds.Client.Common` | `src/Opc.Ua.Gds.Client` |
| `src/Opc.Ua.Gds.Server.Common` | `src/Opc.Ua.Gds.Server` |

## No source changes were needed

`RootNamespace` was already the final name in all three projects — the
namespaces have always been `Opc.Ua.Gds`, `Opc.Ua.Gds.Client` and
`Opc.Ua.Gds.Server`, and only `AssemblyName` and `PackageId` disagreed.
Nothing that compiles against these assemblies changes a `using`
directive; the diff outside the moves is entirely ids, paths and prose.

Directories were moved with `git mv`, and every one of the 73 file moves
is detected as a rename at 100% similarity (bar the handful that also
had a name in their text), so `git log --follow` and blame survive.

## Consumer impact

The package ids change, which is visible to anyone consuming the NuGet
packages:

| 1.5.378 package | 2.0 package |
| --- | --- |
| `OPCFoundation.NetStandard.Opc.Ua.Gds.Common` |
`OPCFoundation.NetStandard.Opc.Ua.Gds` |
| `OPCFoundation.NetStandard.Opc.Ua.Gds.Client.Common` |
`OPCFoundation.NetStandard.Opc.Ua.Gds.Client` |
| `OPCFoundation.NetStandard.Opc.Ua.Gds.Server.Common` |
`OPCFoundation.NetStandard.Opc.Ua.Gds.Server` |

`docs/migrate/2.0.x/packages.md` gains a renamed-packages section — it
is the document that undertakes to cover NuGet renames, and had no GDS
entry — and the migration skill's package table gains the two rows a
1.5.378 consumer needs. That is the only hand-written content in this
PR; everything else is mechanical.

Assembly names follow the package ids, so the section also notes that
binding redirects, trimming descriptors and signing manifests naming the
files directly have to be updated.

## Build infrastructure

Everything naming the projects or their output moves with them:

- `UA.slnx` and `tools/MigrationAnalyzer.slnx` (both re-sorted — the
project lists are alphabetical, and `Gds` now sorts before
`Gds.Client`).
- `.azurepipelines/expected-packages.txt` — 3 ids, also re-sorted for
the same reason.
- `.azurepipelines/signlistDebug.txt` and `signlistRelease.txt` — 18
paths each. Their internal ordering is left alone: that group was
already unsorted, and reordering a signing manifest is diff noise.
- `samples/Reference/ConsoleReferenceServer/Dockerfile`, the two
metapackage nuspecs, the analyzer nuspec's package dependencies, and 8
`.csproj` references across tests, samples and tools.

`preview-pack.slnx` is generated from `UA.slnx` by `generate-slnx.ps1`,
so there is nothing static to edit. Nothing under `.github/workflows`,
and no `.ps1`/`.yml` in `.azurepipelines`, names these projects.

The migration analyzer's shim tree mirrors the source project layout by
its own documented convention, so `Gds.Client.Common/` becomes
`Gds.Client/` and its readme table follows.

## Deliberately not changed

Prose naming past work: `plans/23` still records that its deferral
happened during the "GDS Client.Common modernization", which is the name
that effort had. File *paths* in the same document were updated.

## Validation

`net10.0`:

- `UA.slnx`: 0 errors. 14 warnings, all pre-existing
CA1861/CA1850/CA1307 in `XRegistry`, `Types.Tests` and `WotCon.Tests` —
none in anything this PR touches.
- Assemblies build as `Opc.Ua.Gds.dll`, `Opc.Ua.Gds.Client.dll`,
`Opc.Ua.Gds.Server.dll`, with no `*.Common.dll` produced anywhere.
- `Opc.Ua.Gds.Tests`: 1,116 passed, 0 failed, 54 skipped.
- `Opc.Ua.MigrationAnalyzer.Core.Tests`: 10 passed, 3 skipped.
- A repo-wide grep for the old names returns only the intentional old →
new mappings in the migration docs.

## Checklist

- [x] Existing tests pass
- [x] No new tests — this is a rename with no behaviour change
- [x] Consumer-visible package rename documented in the migration guide

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
2026-09-07 20:08:54 +02:00
Marc SchierandCopilot 62658d1a44 Fix runtime schema resolution and direct construction (#4426)
# Description

Fix runtime schema resolution and provide a supported DI-free
construction path for generated data types.

- Resolve registered data types by local/index-form and namespace-URI
identifiers without using BrowseName as a namespace mapping.
- Preserve identifier kind in URI registry keys, so numeric zero and
empty GUID/string/ByteString identifiers remain distinct in nonzero
namespaces, including during replacement.
- Reconstruct typed identifiers during factory URI-to-index fallback
while retaining exact lookup precedence and
unknown-namespace/remote-server guards.
- Make the built-in JSON, XSD, and BSD generators public, stabilize
`EncodeableFactoryDefinitionSource`, and document generated
activator/factory usage.
- Keep the stable-API assertion effective across the
netstandard2.1/net8.0 polyfill boundary by inspecting attribute metadata
without referencing the ambiguous CLR type.
- Merge the latest `master` without dropping upstream changes.

## Related Issues

- Fixes #4423
- Fixes #4424

## Validation

- `Opc.Ua.Core.Schema.Tests`: 157/157 on `net10.0`
- `Opc.Ua.Core.Schema.Tests`: 157/157 on `net48`
- `Opc.Ua.Core.Schema.Tests`: 157/157 with
`CustomTestTarget=netstandard2.1` and its `net8.0` consumer
- Managed `SchemaAotTests`: 4/4
- NativeAOT Release publish and filtered `SchemaAotTests`: 4/4
- All three review reproductions pass against rebuilt assemblies.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: b17fd166-fdef-4660-a9d5-97c0e69f1bd5
2026-09-06 19:17:49 +02:00
Marc SchierandCopilot 4eccafbe2f Remove AAS projects and samples (#4359)
# Description

Remove the Asset Administration Shell projects and samples from the
mainline
repository while preserving the complete implementation and history on
the
`aas` branch.

This change:

- removes the `Opc.Ua.Aas`, `Opc.Ua.Aas.Client`, `Opc.Ua.Aas.Server`,
and
  `Opc.Ua.Aas.WoT` projects;
- removes the AAS test project, AOT coverage, sample, and documentation;
- removes AAS entries from `UA.slnx`, the expected package list, and
related
  build configuration;
- removes the now-unused `System.IO.Packaging` package version; and
- updates remaining documentation and comments so they no longer
advertise
  removed AAS functionality.

The preservation branch `aas` points to the original `master` commit
before
this removal.

## Related Issues

- None.

## Validation

- `dotnet restore UA.slnx`
- `dotnet build UA.slnx -c Release --no-restore`
- Repository-wide sweep for dangling AAS project, package, file, and
  documentation references

The full Release build completed with zero errors. It reported 31
existing
analyzer warnings in files unrelated to this change.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage. (Not applicable: this removes
a feature and its tests.)
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
2026-08-31 17:08:04 +00:00
Marc SchierandCopilot cef83550cb OPC UA Vision: a vision-guided bin-picking demo an LLM agent can see and drive (#4235)
# Description

Implements **OPC UA — Vision** and uses it to build the demo the
companion specifications were drafted for: an eye-in-hand camera watches
a bin of parts, a language model *looks at the frame*, decides which
part matches the instruction, and commands the robot through Robot
Intent — with the OpenUSD viewer showing the arm move and the bin empty
out.

> **Draft, and stacked.**
[#4195](https://github.com/OPCFoundation/UA-.NETStandard/pull/4195) has
merged and master is merged in, so what is left on top of `master` is
the Vision work plus the unmerged `marcschier/ai-model-management`
branch, which the demo needs for the model/dataset/deployment
provenance. Review the Vision commits; the AI Model Management work
lands with its own PR.

## What is here

**The specification, implemented.** `Opc.Ua.Vision` is generated from
the spec's own `Opc.Ua.Vision.NodeSet2.xml`, vendored byte-identically
(SHA-256 `79C592C6…`, verified against a fresh download and stored
LF-preserved like the Robot Intent NodeSet). `Opc.Ua.Vision.Server`
builds the §4.2 discovery object, sensors, the coordinate-frame tree,
calibrations, media endpoints, inference pipelines and the §9 feedback
methods, with rendering and inference behind injectable providers.
`Opc.Ua.Vision.Client` is built on the generated ObjectType proxies and
composes transforms across the frame tree, which is what turns a
detection in camera coordinates into a pose a robot can act on.

**Two perception paths behind one contract**, which is exactly what
`InferenceLocationEnum` is for. `OnServer` is a deterministic detector
derived from the stage's ground truth — no model, no network, no GPU, so
CI can exercise the whole loop. `EdgeOffServer` is the agent: it sees
the frame over MCP and calls `SubmitDetections`, and the Server
publishes results it did not compute. A client reads
`DetectionResultType` identically either way.

**The agent's eyes.** `tools/Opc.Ua.Mcp.Vision` adds 22 `vision_*`
tools, which with the four shared connection tools makes the `vision`
profile 26; `vision_get_frame` returns the camera image as an MCP
`ImageContentBlock`, so the model looks at pixels rather than reading a
description of them. Tool profiles now compose — `--profile
vision,robotics` yields 62 tools — so one agent can both see and act
without dragging in the full 136-tool catalogue.

**The cell.** `samples/Robotics/BinPickingCell` follows the spec's own
Robotics-Vision Addendum: the `world → robot_base → flange →
gripper_tcp` frame tree with `camera_eih` on the flange, the `HandEye`
extrinsics and the `Intrinsics612x512` intrinsics — the addendum's
2448×2048 calibration scaled to the 4×4-binned grid the camera actually
delivers. `samples/Robotics/BinPickingClient` hosts the composed MCP
catalogue and optionally the viewer.

**Documentation.** `docs/Vision.md` (~800 lines) covers the model,
hosting, the build context, every topology builder, both perception
paths, feedback, the MCP profile and the limitations; linked from
`docs/README.md`, with the profile table in `docs/McpServer.md` and
READMEs for both samples.

## Evidence, not assertions

Each of these was measured on a running system rather than assumed:

| Claim | Evidence |
|---|---|
| The camera sees the bin | 612×512 frame with the bin and all five
parts in view — red `(212,47,47)`, green `(61,193,71)`, blue
`(54,85,218)`, yellow `(215,196,58)`, orange `(209,119,55)` |
| An agent can act on what it sees | Over MCP, `vision_get_frame`
returns a 612×512 PNG that decodes from base64 to 1,254,051 bytes, the
descriptor beside the detections says 612×512, and all five
`BoundingBox2D` centres land **inside** the frame on the pixel colour
their own detection claims |
| The geometry is right | A detection composed `camera_eih → world`
lands on the authored position, residual **0.0000 m** — on both the
on-server and off-server paths |
| The detector tracks the world | Placing a part drops the next scan
from 5 detections to 4, with that part absent |
| The robot obeys the agent | Scripted run took command authority and
completed a pick and a place, both `Succeeded` |
| Tool catalogues are honest | Counted from a running server: vision 26,
robotics 40, `vision,robotics` 62, full 136, **zero duplicates** |
| Every node is browsable by NodeId | Eight representative NodeIds —
both folders, a pipeline, a frame, the sensor, its Calibrations folder,
the HandEye calibration, the Media folder — all `Good` |

That tool-count check matters because the profile tests collapse names
into a `HashSet` and *cannot see* a duplicate registration — so the new
tests count registrations, not names.

## Things that were wrong, and are not now

Writing the tests found three defects of one kind — code that answered
instead of refusing. A zero-norm quaternion was silently rewritten to
identity, so a caller with an all-zero orientation got a confident wrong
grasp pose. `SubmitCorrection` rewrote a null `ResultId` to empty and
called the sink anyway. A bad `StageIdentifier` **killed the host
process** inside native `UsdStage.Open`, via an exception .NET cannot
catch. All three now refuse loudly and are pinned by tests.

**Nodes that existed but could not be reached.** The node manager
indexes the Vision root before configurators run, so everything the
fluent builder grafted on afterwards — both folders, the pipelines with
their Results and Feedback, the frames, the sensors with their optics,
calibrations and media endpoints — was never added to the index.
Browsing *forward from a parent* worked, because that walks
`NodeState.Children` in memory; browsing any of those nodes *by its own
NodeId* returned `BadNodeIdUnknown`, which is how an ordinary client and
the MCP discovery tools navigate. Registration is now deferred and
flushed after each configurator. The first fix covered only the DI path
and left the documented non-DI fallback broken in exactly the same way,
so `ConfigureVisionAsync` now exists and registers what it builds.

That defect survived a green suite because every test browsed children.
The new tests assert by NodeId, and were checked against the broken code
— with the flush removed, they fail.

**Every Method was uncallable.** The Server passed 426 unit tests while
not one of its Methods could be invoked over a real session —
`RunInference` returned `Bad_TooManyArguments`, and so did every other
Method that takes arguments, which is all of them but `StartContinuous`
and `Stop`. Three independent faults, each sufficient on its own: the
Method nodes were never created (they are Optional children, and the
dispatcher guards every attachment with a null check, so it silently
attached nothing); nothing declared the arguments, so the stack
concluded none were expected; and `MethodDeclarationId` pointed at a
synthesised NodeId rather than the NodeSet declaration a client calls
with, so the lookup missed the instance Method entirely. The builder now
creates the Methods, the `Results` folder and the `Feedback` object when
a provider or sink is configured, declares every signature, and names
the right declaration.

Unit tests could not have caught this: they invoke the handler delegates
directly and never go through `MethodState.Call`. It took an end-to-end
test over a real session. Relatedly, children created by the generated
`CreateOrReplace` helpers carry no `ReferenceTypeId`, so nothing could
reach them — fixed once in the build context rather than at the several
dozen call sites.
**And one where I was wrong.** Earlier in this branch I reversed my own
agents' decision and made `SubmitDetections` accept an empty detection
set, reasoning that "I looked and the bin is empty" is a correct
observation and refusing it forces a correct agent to invent a
detection. The reasoning is sound; it is also an argument *against* the
specification rather than an implementation of it. §9.5 is normative and
explicit — its StatusCode table lists `Bad_InvalidArgument` for
"`Detections` empty; or `SubmitCorrection` supplies both or neither
corrected array".

Worse, **none of §9.5's argument rules were enforced anywhere** — the
dispatcher forwarded every submission straight to the feedback sink, so
conformance depended on whichever sink a host installed. They are Server
obligations, so they now live in the dispatcher, ahead of the sink,
proven by strict mocks that would throw if the sink were consulted. The
usability problem is real and does not go away by conforming, so it is
raised where it can be fixed:
[opcua-drafts#70](https://github.com/marcschier/opcua-drafts/issues/70).

## Tracking the updated drafts

The Vision, Robot Intent and AI Model Management NodeSets on
`opcua-drafts` `main` have moved, partly because of feedback this branch
raised. All three are re-vendored byte-identically — verified by
comparing git blob hashes against the upstream files rather than by eye
— and the implementations follow.

**Two statements that were previously inexpressible now have a wire
representation.** `SubmitDetections` takes `SceneIsEmpty` and
`SubmitCorrection` takes `RetractAll`, so an agent can report "I
examined this frame and there is nothing in it" — the terminating
condition of the bin-picking task — and can retract a false positive by
correcting a result down to nothing. Both are checked in both
directions, because the flag is exactly what separates a deliberate
empty observation from a lost payload: an empty array without the flag
is refused, and the flag with an array attached is refused as two
contradictory claims about one frame. Implemented in the dispatcher, the
client, the MCP tools the agent drives, and the sample cell.

Also absorbed: `LampType` and `LightingMode` became enums (§66),
`ProfileName` became `DefaultProfileName` on the endpoint (distinct from
the `ProfileName` a caller passes to `GetStreamEndpoint`, which keeps
its name), AI `Invoke`/`InvokeAsync` gained `PayloadUri` under the same
exactly-one rule, and AI `ListModels` gained a `ContinuationPoint` —
because `MaxResults` alone puts everything past the bound permanently
out of reach.

**OpenUSD is on `0.9.0-alpha`**, verified on the running cell rather
than by restore alone: D3D12 backend, 612×512 frame, the bin and all
five parts in view and detected — the same result `0.8.0-alpha`
produced.

The one local workaround that survives is `VisionMethodArguments`, and
its reason has changed rather than gone away: the builder materialises
these Methods as Optional children through `CreateOrReplace`, which
constructs the state object directly and never runs the generated
factory that now carries the signatures. Checked rather than assumed —
removing the declarations fails five of the eight
`VisionMethodSurfaceTests`.

## Review feedback

Three threads, all addressed in `0fe2803a3`:

- **The AI Model Management work is now a library family, not a
sample.** `src/Opc.Ua.AI` (model), `.Inference` (`IInferenceBackend` and
backends), `.Server` (node manager) and `.Client` (discovery, reads,
calls, artefact transfer), in the same shape as the Robotics and Vision
families; the samples become `samples/AI/ModelManagementServer` and
`ModelManagementClient`. The client library needed real work rather than
relocation: its browsing surface was `private` inside the sample's
scenario runner, so moving the file alone would have produced a library
nobody could call.
- **No cloud-vendor SDK is referenced anywhere.** Inference goes through
`Microsoft.Extensions.AI` — an `IChatClient` is implemented by hosted
services and on-device runtimes alike, which is exactly the property
clause 8.1 asserts. `Azure.Identity` is gone: workload identity is not
an Azure feature, every platform projects a token into a file and each
SDK reads that file behind its own API, so the resolver reads it
directly. The comment claiming `Microsoft.Extensions.AI` would force a
`System.Text.Json` bump was stale — it pins 10.0.10, which this
repository already centralises on.
- **`BinPickingCell` and `BinPickingClient` moved into
`samples/Robotics/`**, which is where they belonged: the cell was
already linking the arm, its kinematics and both USD assets out of
`IntentEnabledRobot`.

## Upstream

Work that belonged elsewhere went elsewhere rather than being worked
around locally:

- **`openusd-dotnet`
[#13](https://github.com/marcschier/openusd-dotnet/pull/13)** — merged
and shipped in `0.8.0-alpha`. `SilkFrameCapture.Capture` rendered only
the first capture of a session and silently returned a blank frame for
every one after it. Also filed
[#14](https://github.com/marcschier/openusd-dotnet/issues/14) (no
camera-by-prim API) and
[#15](https://github.com/marcschier/openusd-dotnet/issues/15) (skipped
tests reported as passed — which fooled me for several runs). Both are
fixed; this branch takes `0.8.0-alpha` and deletes two workarounds,
including 143 lines of hand-rolled projection maths.
- **`opcua-drafts`
[#66](https://github.com/marcschier/opcua-drafts/issues/66)–[#69](https://github.com/marcschier/opcua-drafts/issues/69)**
— a close read of the spec produced 22 candidate ambiguities; 12 were
discarded as misreadings with clause citations and the remaining 10
filed. One is concrete: five members exist in the NodeId CSV that no
clause documents.
- **`opcua-drafts`
[#70](https://github.com/marcschier/opcua-drafts/issues/70)** — §9.5
could not express an empty observation or a false-positive retraction.
**Adopted**, with the explicit-flag resolution argued for:
`SubmitDetections` gained `SceneIsEmpty`, `SubmitCorrection` gained
`RetractAll`, and the corrected-array rule relaxed from *exactly one* to
*at most one*.
- **`opcua-drafts`
[#71](https://github.com/marcschier/opcua-drafts/issues/71)** — the
Vision NodeSet browse-named all 13 `InputArguments` / `OutputArguments`
Properties in the Vision namespace rather than the base namespace, so a
stack could not find them and every Method in the specification was
uncallable. **Fixed**; this branch now tracks the corrected artefact.

## The defect underneath it all

The end-to-end suite was removed earlier in this branch because nine of
its
fourteen tests failed on one symptom: a client could not open a
pipeline's
`Feedback` object or enumerate its `Results`, even though browsing the
same
parent listed both. Restoring it meant explaining that, and the
explanation
was not in Vision.

`RelativePathElement` initialised **`IsInverse` to `true`**. A caller
that
sets a `ReferenceTypeId` and a `TargetName` — which reads as *"the child
reached by this Reference"* — was therefore asking the Server for the
**inverse** Reference, and got `Bad_NoMatch` with nothing in the request
to
suggest why.

`ObjectTypeClient.ResolveChildNodeIdAsync` is such a caller, and it is
what
**every source-generated Optional-child accessor in the stack** is built
on
— the accessor whose own documentation cites
`AlarmConditionTypeClient.GetShelvingStateAsync`
as an example. Vision is merely where it surfaced, because Vision puts
two
Optional children on the path an off-Server agent must take. The sibling
helper in `StateMachineTypeClientExtensions` already set `IsInverse =
false`
by hand, which is the shape of a trap rather than a default.

The default is now forward, `ResolveChildNodeIdAsync` says so
explicitly,
and the existing test that had recorded `true` as *expected* now pins
`false` with the reasoning. Of the forty `RelativePathElement`
construction
sites in the tree, that accessor was **the only one relying on the
default at
all** — every deliberate caller already set it.

Two further defects were found underneath it, both real and both fixed:

- The generated `CreateOrReplace` helpers construct a child state object
directly and leave **`TypeDefinitionId`** unset as well as
`ReferenceTypeId`.
A child referenced by nothing cannot be browsed; one with no type
definition
is a malformed Object that a client filtering by type silently skips —
which
  is exactly what `EnumerateResultsAsync` does. Normalisation moved to
`VisionNodeManager`, so it also covers the case the builder cannot see:
a
result published **at runtime** by an inference provider, long after the
address space was built. That path produced results a client could list
but
  not read.
- `Opc.Ua.AI` shipped without an `AssemblyInfo`, so the solution built
with
  six `CA1014` warnings.

I had initially "fixed" this in the Vision client with Browse-based
fallbacks,
on the strength of a probe that appeared to show
`TranslateBrowsePathsToNodeIds`
failing even for `Server → ServerStatus`. That probe was wrong: it used
an
unqualified `ReferenceTypeIds`, which inside a `Opc.Ua.Vision.*`
namespace
binds to *Vision's* `ReferenceTypeIds` and yields a nonsense NodeId.
Chasing
that to the end is what turned up the real cause. **The fallbacks are
gone** —
they would have hidden a stack-wide bug behind a Vision-shaped
workaround, and
one of them matched on browse name while ignoring the namespace index.

`tests/Opc.Ua.Vision.Intent.Tests` is restored and back in `UA.slnx`,
passing
**14/14** on its own merit rather than through a client-side workaround.
A
registration test now pins the pipeline's `Feedback` and `Results`
children,
which nothing covered before.

## Running it, and what that found

The demo's premise is that a language model **looks at the bin and
reasons
about what it sees**. Running it end to end showed it could not, for
reasons
no test covered, because every one of them lived between components.

**The sample did not compile.** Two `CS8604` nullable errors with
`TreatWarningsAsErrors`, so neither the cell server nor the demo could
be
started at all. Worth recording that my first explanation was wrong: CI
*does*
build this project - the Linux leg's `net10.0` pass compiles it,
log-confirmed -
so this is not a coverage gap in the workflow, and no workflow change
was made.

**`Pick` and `Place` never moved the arm.** They were a delay plus a
gripper
action, so the operations reported `Succeeded` while nothing travelled.
They now
solve IK once and interpolate in joint space. **And the parts never
moved**: the
arm swung but the bin stayed full, because nothing tied the held object
to the
world state. The connector now creates 11 monitored items where it
created 6,
and a scripted run delivers `SeqNo=151` across 10 messages where it
delivered
`SeqNo=3` across 1.

**The frame was smuggled through a string field.** The media provider
put a
base64 *data URI* of the PNG into `VisionImageReferenceDataType.Uri` - a
field
meant to be a *reference*, while the bytes were already returned in the
inline
`ByteString`. Every response therefore shipped the image twice, and a
1,311,400-byte PNG became a 1,748,536-character string against a
`MaxStringLength` of 65,535: **26.7x over**. That is why raising
`MaxByteStringLength`, `MaxArrayLength` and `MaxMessageSize` never
helped - none
of them govern a `String`. Separately the MCP tool assigned raw bytes
where
`ImageContentBlock` requires base64, so the wire carried
`"data":"�PNG..."` -
every non-UTF-8 byte replaced by U+FFFD, destroying the image and
inflating the
response to 6.8 MB.

**The camera was aimed at nothing.** The arm's home pose, the flange
scan pose
the Vision model declared and the joint angles in the USD stage were
three
independent claims about where the camera was, and they disagreed - the
declared
flange orientation pointed the view 86 degrees away from the projection
camera.
Solving them as one thing exposed two further constraints that are easy
to miss:
the camera has to sit off the tool axis or it photographs its own
gripper, and
the IK branch has to be elbow-back or a link parks under the camera and
fills the
frame with the arm's own upper arm. A third was a regression this branch
introduced and `Opc.Ua.Robotics.Tests` caught - aiming a straight-down
camera
from a point on the base's own X-Z plane puts the wrist on the J4/J6
singularity, so every motion away from home fails to solve. A 15-degree
camera
roll, free because the camera still looks straight down, gets 25 degrees
clear,
which is the margin the poses before this branch had.

**The frame and the detections were different images.** The sensor
declared
2448x2048, the clip endpoint 1280x1024, and the renderer produced
640x512 - not
even the same aspect ratio. The ground-truth detector projects through
the
declared intrinsics, so its boxes lived in 2448x2048 space while an
agent was
handed a 640x512 picture: *"pick the red cube you can see"* arrived with
coordinates that pointed off the image. Everything now agrees at
612x512, an
exact 4x4 bin of the native sensor with the intrinsics scaled to match;
the
native size stays in the model and serial number, where it describes the
hardware rather than the image.

**`LatestClip` was created and never written**, so it reported
`Bad_NoDataAvailable` for the life of the Server and a consumer
following the
model - read the published frame, call the method only if there is none
- never
got a frame. The dispatcher now publishes a clip it has just encoded,
for every
Vision server rather than this sample alone.

One genuine API gap turned up on the way: `OpcUaServerOptions` exposes
`MaxByteStringLength`, `MaxArrayLength` and `MaxMessageSize` and **no
`MaxStringLength`**, so a Server that legitimately needs a long string
could not
raise the limit through the hosting API at all. Added, with tests. It is
not the
fix for anything above - that was a design bug - but the missing knob
was real.

## Not finished

- **Two projects sit below the repository's 80% line coverage.**
`Opc.Ua.Vision.OpenUsd` is at 71.1% — what is left only executes with a
real OpenUSD stage and plugin tree, which is not on every build agent.
`Opc.Ua.AI.Inference` is now at **86.7%**, up from 12.9%: the code this
branch *wrote* is covered by 25 tests, and `RestChatCompletionsBackend`
— previously the whole of the shortfall — is covered by 18 more against
a stubbed `HttpMessageHandler`, exercising success, refusal, throttling,
retry-after, timeout and cancellation without a network. Everything else
clears the bar — `Opc.Ua.Vision.Server` 92.1%, `Opc.Ua.AI` 91.4%,
`.Vision.Client` 88.1%, `Opc.Ua.Vision` 85.7%, `Opc.Ua.AI.Server` 80.1%,
all measured with coverlet. The CI coverage gate reports itself as
advisory and non-blocking.
- **`SamplesCollected` is not counted here, and `docs/Vision.md` now
says so.** Section 9.4 requires a Server to count a negative example
(`SceneIsEmpty` / `RetractAll` carrying a `GroundTruthLabel`) exactly as
it counts one carrying geometry. `VisionNodeManager` does not, and
structurally cannot: `SamplesCollected` is a property of
`LearningJobType`, which the *AI Model Management* companion defines,
and Vision reaches the job through a `NodeId` value rather than a
Reference **precisely so this model takes no dependency on the model
that defines it**. What the Server does guarantee is that the negative
example survives the hop intact — both flags are carried verbatim to
`IVisionFeedbackSink` — so a host that binds a learning job has
everything it needs to satisfy the clause on the counter it owns. Stated
in the limitations rather than left implied.

## Related Issues

Was stacked on #4195, now merged. No tracking issue yet for the Vision
implementation itself — happy to open one if you would like the design
recorded as an ADR before this goes further.

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage. — *Types 8562, Server 4072,
Client 2123, InformationModel 1063, Robotics 540, Tools 466, Vision 442,
AI 74 and the restored Vision+Intent end-to-end suite 14/14, all green
on net10.0. Only `.OpenUsd` (71.1%) is below the 80% bar — see Not
finished.*
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings. — *`dotnet build UA.slnx -c Release`: 0 errors, 0
warnings.*
- [x] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed. — *net48:
Types 8555, Client 2126, Vision 385 green. Two net48 Server tests fail
(`CreateUserManagementSeamBindsTheModelToTheServerAsync`, and
`DurableDataValueQueueVerifyReferenceBatchingAsync` only under parallel
load); both were confirmed **pre-existing** by re-running them with the
`IsInverse` change reverted, which fails identically.*
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings. — *The net48 build legs failed because the
restored end-to-end project used `ValueTask.FromResult` /
`string.Create`, which do not exist on .NET Framework; fixed in
`fb57522da` and verified building on every TFM.
`DisposeDrainsHeldConnectionCallbackBeforeListenerDisposal` failed once
on the Ubuntu Client leg — a 13 ms timing-sensitive reverse-connect
disposal test that passes locally 2123/2123 and touches no browse
paths.*
- [ ] I have addressed **all** PR feedback received.
## Typed Vision-guided Robotics MCP workflows

The branch now also makes the demo workflow first-class in the Full MCP
profile:

- replaces stringified Robotics intent and mission inputs with typed
request schemas and exact name-or-NodeId selectors;
- adds bounded operation/mission paging, stable step-to-operation
identity, retained mission discovery, and `robotics_wait_mission`;
- makes `vision_run_inference` return bounded typed detection,
inspection, or segmentation summaries in one call;
- adds same-session `robotics_vision_pick` to select a detection and
submit Pick or Pick/Place work without implicitly taking authority,
retrying, cancelling, or waiting; and
- starts Publish workers for classic subscriptions so an independently
launched OpenUSD viewer receives live robot and part updates.

The migration guide documents the intentionally breaking MCP
request-schema changes.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 1dab1302-19c5-4a9b-a50c-d97d389713aa
Copilot-Session: a248a589-9a20-4372-868e-5d347e57001b
Copilot-Session: 99d1ab42-f83a-41ab-bf3e-85bf81fadace
Copilot-Session: bcbc8ac9-5abd-42a8-8bac-e10533790e2e
2026-08-29 19:34:15 +02:00
Copilotandromanett 8ea319d910 Fix macOS ARM64 NativeAOT linker failure in aot-macos-latest (#4298)
# Description

The `aot-macos-latest` job was failing while linking
`tests/Opc.Ua.Aot.Tests` on `macos-latest` / `osx-arm64`, before managed
tests started. The failure was an Apple linker assertion (`too many
large addends`) caused by the size/fixup profile of the NativeAOT test
binary.

- **Root cause**
  - `Opc.Ua.Aot.Tests` publishes a large NativeAOT executable.
- On Apple Silicon CI, the final native link hit the linker’s
addend/fixup limit.

- **Change**
- Keep the fix scoped to
`/tests/Opc.Ua.Aot.Tests/Opc.Ua.Aot.Tests.csproj`.
- For macOS only, make the AOT publish size-focused and drop native
debug / debugger / stack-trace payload:
    - `OptimizationPreference=Size`
    - `DebugType=none`
    - `DebuggerSupport=false`
    - `StackTraceSupport=false`
  - Retain identical-method-body folding.

- **Impact**
  - Lowers linker pressure on macOS ARM64 CI.
  - Leaves production assemblies unchanged.
- Keeps the managed test surface intact; only the CI-only NativeAOT test
executable shape changes on macOS.

```xml
<PropertyGroup Condition="$([MSBuild]::IsOSPlatform('OSX'))">
  <IlcFoldIdenticalMethodBodies>true</IlcFoldIdenticalMethodBodies>
  <OptimizationPreference>Size</OptimizationPreference>
  <DebugType>none</DebugType>
  <DebuggerSupport>false</DebuggerSupport>
  <StackTraceSupport>false</StackTraceSupport>
</PropertyGroup>
```

## Related Issues

_Reference all GitHub issues this PR addresses. If there is no issue
yet, open one and link it here._

_If this is a relatively large or complex change, a design must have
been discussed in the related tracking issue and signed off (which
becomes the Architectural Decision Record (ADR))._

## Checklist

_Put an `x` in the boxes that apply. You can complete these step by step
after opening the PR._

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [ ] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: romanett <7413710+romanett@users.noreply.github.com>
2026-08-21 15:44:38 +00:00
d525bc3f28 Bound reconnect cleanup and organize samples by domain (#4276)
# Description

This PR fixes bounded ManagedSession reconnect cleanup and reorganizes
the sample applications into domain-focused folders.

## Reconnect cleanup

- Bounds reconnect integration cleanup with independent 30-second close
and dispose limits.
- Sends `CloseSession` through the awaited transport request path during
`Session.DisposeAsync`.
- Preserves explicit `Session.CloseAsync` behavior that waits for or
cancels outstanding publish requests.
- Covers the disposal request path with a regression test.

## Sample organization

- `samples/OpenUsd`: `GeneratorServer`, `SiteCompositionServer`
- `samples/Redundancy`: `RedundantClient`, `RedundantServer`,
`RedundantPubSub`
- `samples/Isa95`: `MinimalIsa95Server`
- `samples/MinimalApi`: `MinimalBoilerServer`, `MinimalCalcServer`,
`MinimalClient`
- `samples/DI`: `PumpDeviceIntegrationServer`
- `samples/Lds`: `ConsoleLdsServer`
- `samples/Reference`: `ConsoleReferenceClient`,
`ConsoleReferenceServer`
- `samples/PubSub`: `ConsoleReferencePubSubClient`

`UA.slnx` now exposes the same requested domain groups. Project
references, tests, runtime sample probes, CI workflows, Dockerfiles,
Compose files, helper scripts, and documentation were updated to the new
paths. `samples/Robotics/MinimalRobotServer` remains under `Robotics`.

## Validation

- `dotnet build UA.slnx`
- 3 Redundancy short-haul sample tests
- 70 DI sample tests
- 914 OpenUSD tests
- 1 WotCon model-materialization test
- 137 AOT tests
- `docker compose config` for all 6 moved Redundancy Compose files

## Related Issues

- Fixes #4273

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce new build or
analyzer warnings.
- [x] I built the complete `UA.slnx` solution locally.
- [ ] I ran all tests locally against at least .NET Framework and .NET
10.
- [ ] I fixed all failing and flaky tests in the CI pipelines and all
CodeQL warnings.
- [x] I have addressed all PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
Co-authored-by: Marc Schier <mschier@microsoft.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
Copilot-Session: a2c2838f-74ae-4997-a1d4-50574d9e0636
2026-08-21 04:35:47 +00:00
Copilotandromanett ef667a1082 fix(aot): remove deprecated -ld_classic linker flag causing macOS NativeAOT build crash (#4291)
The `aot-macos-latest` CI job was crashing during NativeAOT link with an
assertion in `ld_classic` itself (`Assertion failed: (it !=
_dylibToOrdinal.end())`). The `-ld_classic` flag was originally added as
a workaround for a "too many large addends" linker issue, but recent
Xcode toolchains on `macos-latest` runners have a bug in `ld_classic`
that causes it to crash when linking large NativeAOT binaries. The
classic linker is also deprecated and being removed.

## Changes

- **`tests/Opc.Ua.Aot.Tests/Opc.Ua.Aot.Tests.csproj`**: Removed the
`<LinkerArg Include="-ld_classic" />` item for macOS builds. The modern
default linker handles the binary correctly on current toolchains.
`IlcFoldIdenticalMethodBodies` is retained as it still reduces binary
size and fixup count.

## Related Issues

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [ ] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: romanett <7413710+romanett@users.noreply.github.com>
2026-08-20 06:31:52 -07:00
4ac6084fe5 Fix aot-macos-latest CI: resolve "too many large addends" linker assertion on macOS ARM64 (#4278)
The `aot-macos-latest` CI job was crashing during the NativeAOT link
step on macOS ARM64 with an Apple linker assertion failure (`ld:
Assertion failed: (_addend == uniqueIndex && "too many large
addends")`). This occurs when the linked binary exceeds the new Apple
`ld`'s fixup/relocation capacity — `Opc.Ua.Aot.Tests` references nearly
the entire SDK surface and has crossed that threshold.

## Changes

- **`tests/Opc.Ua.Aot.Tests/Opc.Ua.Aot.Tests.csproj`** — two
complementary macOS-only workarounds:
- `IlcFoldIdenticalMethodBodies=true`: reduces total fixups by
deduplicating identical method bodies at the ILC stage, lowering the
relocation count below the Apple `ld` threshold.
- `<LinkerArg Include="-ld_classic" />`: falls back to the classic Apple
linker which does not have this assertion, as a secondary safety net.

```xml
<PropertyGroup Condition="$([MSBuild]::IsOSPlatform('OSX'))">
  <IlcFoldIdenticalMethodBodies>true</IlcFoldIdenticalMethodBodies>
</PropertyGroup>
<ItemGroup Condition="$([MSBuild]::IsOSPlatform('OSX'))">
  <LinkerArg Include="-ld_classic" />
</ItemGroup>
```

Both properties are conditioned on `OSX` and have no effect on Windows
or Linux builds.

## Related Issues

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [x] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: romanett <7413710+romanett@users.noreply.github.com>
Co-authored-by: Marc Schier <marcschier@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-08-19 22:59:25 +00:00
Marc SchierandCopilot 397db603db Add OPC UA for Asset Administration Shell: the published OPC 30270 and v3 draft (#4244)
# Description

Implements the **Asset Administration Shell** companion specifications
on top of `marcschier/wot-type-binding`, in two halves that a Server
chooses between:

* **AAS V3** — the
[draft](https://github.com/marcschier/opcua-drafts/tree/main/companion-specs/AAS)
(`http://opcfoundation.org/UA/I4AAS/v3/`), all sixteen conformance
units: the metamodel, the registry built on the abstract xRegistry base,
generational materialization, federation, packages with digest-bound
integrity, the Digital Product Passport vocabulary, and the Annex F
bridge to WoT Thing Descriptions.
* **AAS V2** — the published [OPC
30270](https://reference.opcfoundation.org/specs/OPC-30270/full)
(`http://opcfoundation.org/UA/I4AAS/`), which maps the AAS V2.0.1
metamodel: object model, ingestion of XML, JSON and AASX,
materialization, server and client.

The two are different metamodel generations rather than two revisions of
one model — V2 keeps `Asset` as a first-class Identifiable,
`identification.idType`, Views and ordered collections, none of which
survive into V3 — so they are **alternatives**. A Server hosts one or
the other; this is documented rather than enforced at startup. Each is
named for the generation it maps (`Opc.Ua.Aas.V2`, `Opc.Ua.Aas.V3`,
`AddAasV2Server`, `AddAasV3Server`), and what genuinely serves both
carries no marker and sits at the root of `Opc.Ua.Aas`: the
deterministic NodeId encoding and idShortPath conventions,
`AasOptional<T>`, the digest rule, the materialization diagnostics, the
AASX container walk, and the value and operation providers, which are
keyed on `NodeId` and `Variant` and so carry no version at all.

## What is in here

**New libraries**: `Opc.Ua.Aas`, `Opc.Ua.Aas.Server`,
`Opc.Ua.Aas.Client`, `Opc.Ua.Aas.WoT`, plus `samples/Aas` and
`docs/Aas.md`.

**Enabling changes to existing code**, each needed by the above:

* The OPC UA `Decimal` DataType added to `Opc.Ua.Types`, with its Part 6
§5.1.10 wire encoding. `BinaryDecoder` gained one internal member,
`TryReadRemainingBodyBytes`, because a trailing field with no
self-describing length cannot otherwise be read; `Decimal.Decode` is its
only caller. Part 6 Table 3 types the unscaled `Value` as an
**OctetString whose byte count is `Length` − 2**, not a length-prefixed
`ByteString`, so it carries no length of its own —
`DecimalEncodingTests` pins the body byte-for-byte against that mistake,
and against the `Length ≤ 2` values the same table calls invalid.
* The xRegistry projection engine extracted into
`Opc.Ua.XRegistry.Server` and `Opc.Ua.WotCon.Server` migrated onto it
(−848/+387 lines), with the WoT Connectivity tests passing **unedited**.
* Two source-generator fixes, both of which made a model impossible to
build (see below).

## Defects found and fixed along the way

Running the stack end to end, rather than trusting per-area test suites,
surfaced defects that no unit test caught. The ones worth a maintainer's
attention:

* **The generator emitted non-terminating constructors.** A structure
field with no declared default was initialized with `new T()`, so a
self-referential DataType (`AASReferenceDataType.referredSemanticId`)
recursed until the stack overflowed and `AddOpcUaAas` could not load the
model at all. The test host *died* rather than failing. Only the field
that closes a cycle is now left null.
* **The generator omitted `new` on a redeclared placeholder.**
`AASOrderedSubmodelElementCollectionType` redeclares the
`SubmodelElement` slot of its base type, and the generated `Add` method
hid the base one without saying so, so the V2 model would not compile.
No existing model could have hit either defect — both are build
failures, so anything that builds today is unaffected.
* **The metamodel half had never worked outside its unit tests**: the
emitted NodeSet declared no reference-type aliases and was rejected by
the loader; the Mandatory `Invoke` Method was never emitted, because a
NodeSet is imported as written rather than instantiated from its type;
the runtime bound at the authored namespace index instead of the one the
Server assigns; and `MethodDeclarationId` was addressed in the wrong
namespace. Every materializer test inspected the in-memory object graph,
which cannot see whether the graph is loadable — two tests now import it
exactly as `RuntimeNodeSetNodeManager` does.
* **The client could not see any Property member.** It browsed
`HasComponent` with subtypes, but `HasProperty` is a sibling under
`Aggregates`, so reading a value failed and invoking failed argument
validation.
* **Every repeated registry write forked a duplicate group and
resource** instead of adding a version, because the identifier was
re-derived against a sibling set that already contained the entity
itself. This also made the persistence bounds unreachable.
* `.gitignore`'s `**/packages/*` silently swallowed the whole
package-integrity implementation and its tests, which would have
vanished on a fresh clone.

## Specification findings

Nine findings against the V3 draft are fixed in
[marcschier/opcua-drafts#75](https://github.com/marcschier/opcua-drafts/pull/75).
The substantive one: clause 6.1.5's absent-versus-empty rule was
**unsatisfiable** for five container fields that materialize as parent
components with no node of their own, which made `AAS-LosslessRoundTrip`
unachievable.

OPC 30270 contradicts itself twice. Both are recorded in
`AasV2ConformanceUnits.cs` and the documentation rather than smoothed
over: Table 83 spells the unit `I4AAS MultiLangaugeProperty` where Table
85 spells it correctly, and Table 85 lists an `I4AAS Security` unit that
Table 83 never defines. Table 84, which would assign profile URIs, is
empty, so `ServerProfileArray` gains no I4AAS entry.

## Known limitation

Calling an `Operation` **with arguments** answers `BadTooManyArguments`.
Method resolution works from both the instance NodeId and the
`MethodDeclarationId`, and the argument definitions are published, but
`NodeState.AddChild` does not route through `MethodState.FindChild`, so
a Method imported from a NodeSet leaves its typed `InputArguments` null.
Closing this means changing how the shared NodeSet import claims typed
children, which affects every consumer of runtime NodeSets and is out of
scope here. It is documented in `docs/Aas.md` §11, the conformance
matrix marks `AAS-OperationInvoke` partial rather than claiming it, and
`samples/Aas` exercises the path and reports the status rather than
working around it. V2 is unaffected — its `Operation` is an
OptionalPlaceholder with no declared arguments.

## Related Issues

- No tracking issue yet. Opening as a **draft** for design discussion
first, per the ADR guidance below; happy to open one and link it once
the shape is agreed.

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [x] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

### Verification

| Check | Result |
|---|---|
| AAS tests | **670 passed, 0 failed** on net472, net48, net8.0, net9.0,
net10.0 |
| Coverage | Client 80.8 %, Server 81.2 %, `Opc.Ua.Aas` 82.0 %, WoT 82.4
% — all above the 80 % gate |
| Libraries | `Opc.Ua.Aas`, `.Server`, `.Client`, `.WoT` build clean on
every target framework, zero warnings |
| Regression | `Opc.Ua.Types` 8677, `Opc.Ua.WotCon` 1094,
`Opc.Ua.XRegistry` 198, `Opc.Ua.Server` 4050 — all green |
| Sample | `samples/Aas` builds warning-free and runs end to end |
| Merge validation | Solution builds clean on net10.0 and net48; WoT
Types 504, WotCon 1111, AAS 670, XRegistry 198 tests passed |
| CI | All 99 checks green on `ff9298e44`; only the CLA signature status
is outstanding |

### Review pass

A full review against both specifications, and for API consistency and
correctness, produced twelve
fixes. Each one has a test that fails without it.

| Defect | Where | Why it mattered |
|---|---|---|
| V2 projection aborted on **every** `File` read from a document |
`AasV2EnvironmentRuntime` | The runtime bound `File/Value`
unconditionally, the materializer emitted it only with content, and the
builder throws `BadNotFound` for an unknown NodeId — aborting the whole
registration. No reader ever populates `AasFile.File`, so no AAS V2
document could be hosted at all. |
| `aas-suppl` anchored on the wrong part | `AasxPackageReaderCore`,
`AasxPackageWriter` | IDTA and the Package Explorer anchor it on the
environment part; we used the origin part. Every real `.aasx` returned
zero supplementary files, silently. Affects both halves. |
| Federation failed closed on pooled connections | `AasFederation` |
`ConnectCallback` fires only for new connections, so the second fetch to
an origin — and all of net472/net48/netstandard2.1 — failed with a
security-flavoured error. The peer is now validated *inside* the
callback, which makes reuse safe by construction. |
| Malformed `Decimal` escaped as `ArgumentOutOfRangeException` |
`BinaryDecoder` | A declared body shorter than `Scale` produced a
negative read length. Two of the three test cases had been passing for
the wrong reason. |
| V2 and V3 cross-wired their value providers |
`OpcUaAasServerBuilderExtensions` | Both registered `IAasValueProvider`;
whichever was added first served both AddressSpaces. V2 now has its own
contract, so co-hosting is harmless rather than silently wrong.
`EnvironmentFolder` was also bound and ignored on the V2 path. |
| Export filter skipped three nesting kinds | `AasEnvironmentExporter` |
Content under `Entity`, `AnnotatedRelationshipElement` and `Operation`
was exported unevaluated *and* stamped with a Digest presenting it as
complete (clause 6.5.10). List authorization paths also shifted after a
denial. |
| Concealment held at the Method but not in the projection |
`AasRegistryModel` | `GetSubmodel` answered `BadNotFound` while an
anonymous Browse revealed the node, its identifier, semanticId and
digest (clause 6.5.7). |
| File handles were unsynchronized and unowned | `AasElementFileManager`
| The async node manager holds no lock, so concurrent Calls raced a bare
`Dictionary`; sequential handles let any Session read, seek or commit
another's. Writes were also unbounded. |
| Projection host was unimplementable outside the stack |
`AasEnvironmentProjection` | The handle demanded a type with an internal
constructor — our own tests used
`FormatterServices.GetUninitializedObject` to get round it. Now mirrors
WotCon's interface-typed registration. |
| Embedded `FileType` omitted 7 of 10 Mandatory members |
`AasEnvironmentMaterializer` (V2) | OPC 10000-3 6.4.4 requires them all;
without `Size` and `OpenCount` a Client cannot size a read or detect an
abandoned handle. |
| Round-trip oracle ignored most of the model | `AasRoundTripComparer` |
`Blob`, `File`, `ReferenceElement` and `BasicEventElement` had no case
arm, so their fields compared equal by falling off the switch;
`valueType`, `semanticId`, `entityType` and `Key.type` were never read.
The clause 6.4 losslessness claim rested on it. |

Known, unchanged: calling an `Operation` with arguments answers
`BadTooManyArguments`, because
`NodeState.AddChild` does not route through `MethodState.FindChild`.
Documented in `docs/Aas.md` §11.

Not addressed in this pass, and worth a maintainer decision: OPC 30270
§9.2 says all NodeIds of
Nodes not defined in the companion specification **shall not** use the
standard namespaces, and
Table 87 marks a vendor-specific instance namespace Mandatory. Both
halves currently mint instances
in the companion namespace. Separating them touches NodeId minting, the
runtime and the client
together, so it is better done deliberately than folded into a review
pass.
This is a large change and touches shared code (`Opc.Ua.Types`, the
source generator, the xRegistry projection). It is deliberately a draft:
the enabling changes are separable if maintainers would prefer them
split into their own PRs. The latest `master` is merged into this branch
in `0dd0ff0e1`.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 9e6a5abf-3299-4cd1-9855-010fedbf0ad8
Copilot-Session: c3d88950-4a65-4ff6-87d2-1f545a875c9b
Copilot-Session: b8ab3763-b9bd-46ae-b0ef-045db26e5782
2026-08-18 08:11:47 -07:00
aad8350bc1 Pluggable symmetric cryptography, an awaitable asymmetric path, registrable security policies, and PubSub crypto offboarding (#4206, #4207, #4208, #4210) (#4232)
# Description

Closes the three crypto-offboarding follow-ups split out of #4192. Each
was recorded there as knowingly *not* done, with the reason and what
would justify revisiting it. Those conditions are met, and where one of
them turned out to be unachievable that is written down rather than
worked around.

The safety property throughout: **every seam is opt-in and null-checked,
and in the default software configuration the added code is observably
inert.** No interface dispatch on the per-message path, and the
asynchronous paths complete synchronously — so channel locking order,
buffer ownership and error sequencing are unchanged for a deployment
that configures nothing.

## #4207 — symmetric, key-derivation and RNG provider seams

`ISymmetricCryptoProvider`, `IKeyDerivationProvider` and
`ISecureRandomSource`, added on the terms #4207 set: only once a
concrete requirement arrived (a validated module that must perform
*every* operation, not just the asymmetric ones), behind a fast path,
with `SymmetricChannelCryptoBenchmarks` as the gate.

They are **facets discovered by type test**, not members of
`ICryptoProvider`, so providers written against the shipped interface
still compile. `PlatformCryptoProvider` implements all three, which
answers the "an interface nothing implements" objection recorded in the
issue.

`CryptoProviderFacets` returns `null` both when no registry is
configured *and* when resolution lands on the platform, because the
platform facets are the inline code. Resolution happens once, in
`CalculateSymmetricKeySizes`, and is held for the life of the channel.

`CryptoCompliance.GetUnservedOperationPurposes` closes the failure the
seam would otherwise introduce: a provider bound to `ChannelSymmetric`
without implementing the facet is silently replaced by the platform, so
a deployment could believe its validated module performed the
per-message cryptography while the platform did. Under `FipsOnly` that
now refuses to start.

## #4208 — the asymmetric path is awaitable

`RSA` and `ECDsa` are .NET's contracts and cannot be replaced without
making every ready-made hardware and cloud implementation unusable.
Instead an implementation may **also** declare `IAsyncRsaKey` /
`IAsyncEcdsaKey`, which the stack finds by type test.

Now asynchronous: the secure channel open and renew path, user identity
token signing and decryption, and session activation. A software key
declares neither facet, so those paths complete synchronously and
nothing about their ordering changes.

`ReadAsymmetricMessage` is refactored into shared helpers rather than
duplicated — adding an `await` was not worth two hundred cloned lines of
signature, padding and endpoint-selection logic. `AsymmetricMessage` /
`AsymmetricWriteResult` exist because an asynchronous method cannot have
`out` parameters.

The channel no longer serialises its state on a monitor. A monitor
cannot be held across an `await`, and a plain `SemaphoreSlim` was not an
option at the time: the code relied on re-entrancy in eight places
(`HandleIncomingMessage` holds the lock and calls `ForceChannelFault`,
which takes it again; `ForceReconnect` and `Shutdown` do the same).
`ChannelGate` replaces it at 32 sites and `DataLock` is `[Obsolete]`.
That reliance has since been removed as well — see [Removing the gate's
re-entrancy](#removing-the-gates-re-entrancy) below.

### Defects this surfaced, all fixed and regression-tested

**Detached work started inline.** Writes were started with `_ =
WriteBuffersAsync(...)`. An async method runs its prologue on the
caller's stack, so `LeaveInheritedContext` — which exists to stop
*detached* work inheriting the right to re-enter the gate — was
stripping the **caller's own** entitlement; when the send then completed
synchronously, the completion blocked on a gate that very thread was
holding. The client sent its OpenSecureChannel request and never
processed the response. Writes are now queued.

**A synchronous gate handle held across an `await`.** `Enter()` records
the acquiring thread so an inline completion callback can re-enter —
`ChannelAsyncOperation` invokes its callback both inline and detached.
That record is only sound while the holder is synchronously on that
thread; the token renewal path held it across an await, so a reused pool
thread was recognised as the holder.

**`SignAsync` rejected the policy that signs nothing.** It validated the
certificate before the algorithm, so `SecurityPolicies.None` — which
carries no certificate — threw where the synchronous `Sign` returns
`null`.

**`EnterAsync` lost the holder when contended** *(found in review)*. The
`AsyncLocal` recording ownership was written inside the awaiting method,
and .NET restores the caller's execution context when an async method
completes, so the write was discarded. The caller returned owning the
semaphore while `IsHeldByCurrentContext` reported `false` — and any
nested `Enter()` then blocked forever on a gate its own context held.
Reachable remotely: `HandleIncomingMessageAsync` → error path →
`ForceChannelFault`. The holder is now published from the caller's frame
before the wait, and only its depth is raised in the continuation.

**Queued writes lost their order** *(found in review)*. Sequence numbers
are assigned under the gate, but independently queued work items reach
the transport's FIFO send lock in arbitrary order, so a peer could
reject a chunk with `BadSequenceNumberInvalid`. Writes are now appended
to a chain: still off the caller's stack, but a write cannot start
before its predecessor finishes.

### Four more this surfaced in CI, on paths only the integration suites
reach

Queuing the writes to fix the deadlock above turned out to have moved
three implicit guarantees, and the gate had one more liveness bug. Each
was reproduced locally against a clean baseline before it was changed.

**A faulting channel's error message never reached the peer.** A
listener channel sends a UASC `Error` describing why it faulted and
closes the transport as its next statement. That worked only because the
write started on the caller's stack, so the bytes reached the socket
first; queued, the close discarded them and the client saw
`BadConnectionClosed` instead of the certificate status it was told to
expect. Nine `SecurityCertValidationTests` cases assert exactly that
status. The terminal error is written inline again, on a path that
touches the gate only to disclaim what it inherited and reports nothing
— a channel that is already faulted is owed nothing beyond its buffer.

**The certificate of a rejected sender leaked.** An asynchronous method
cannot have `out` parameters, so the asymmetric read returns a record
instead. That silently dropped an ownership guarantee: an `out`
parameter reaches the caller even when the method goes on to throw, so
the caller's `catch` disposed the sender certificate and reported it to
the audit. A return value does not — nine leaked certificates, one per
rejection case, which the leak detector fails the run on. The parsed
certificate is now handed to the caller before anything that can reject
the message, restoring both the disposal and the audit.

**The gate could strand its own permit.** It released only when the
holder's depth returned to zero, but that depth lives in an `AsyncLocal`
and is therefore shared with every context forked from the owner's — a
timer callback whose timer was created inside the region, for instance.
Such a context entering the gate raised the shared depth, so the owner's
own exit saw a non-zero depth and returned without releasing, and
nothing afterwards could: the nested exit is not the owner. Every later
entry on that channel blocked forever. `Opc.Ua.Features.Tests` hung
after its tests had finished, with a receive loop waiting on the gate
and the server unable to stop. The owner now releases when it leaves;
depth still gates re-entrancy, but liveness no longer depends on a count
another context can move.

**Write completion throttled the writer.** Reporting a completed write
sat inside the ordering chain, and the client channel implements that
callback by entering the gate — so every write queued behind a gate the
receive loop contends for on each incoming chunk. A session with fifty
subscriptions publishing continuously had its publish requests throttled
enough that the client kept topping them up past its own limit, which
`Subscriptions.Classic` asserts against. Completion is now reported off
the chain, which covers only what ordering actually requires.

### Still synchronous, and why

Certificate, certificate request and revocation list signing cannot be
made asynchronous at all: `X509SignatureGenerator.SignData` is invoked
by .NET's own builders. Service faults and the `Reconnect` override are
reached from synchronous call sites (`SendServiceFault` alone has eight)
and are left as they are behind scoped, commented suppressions. All
three are documented rather than left to be rediscovered.

## #4210 — PubSub

This one produced a finding rather than the API the issue asked for, and
the finding is the point:

> **With a standard Security Key Service the key necessarily exists in
process memory.** `GetSecurityKeys` (Part 14 §8.3.2) returns raw key
bytes over the wire, so the "key never leaves the device" property #4192
achieved for client and server **cannot** be achieved for PubSub through
the SKS pull profile. That is a property of the specification, not of
this stack.

A wrapped-key envelope would change what is on the wire and break
interoperability with third-party key services and publishers, so it was
rejected rather than built.

What is achievable is delivered: the per-message AES-CTR and HMAC route
through `ISymmetricCryptoProvider`, so a validated module performs them.
`IPubSubSecurityPolicy` is **not** modified — new members would break
every implementation of it; the provider is supplied through the policy
constructor. `PlatformSymmetricCryptoProvider` gained AES counter mode,
which the seam should have covered anyway since the algorithm enum names
it.

Key lifetime is also tightened: unpacking an SKS response copied key
material into intermediates that `ByteString.Create` then copied again,
leaving plain keys in the heap for the lifetime of the process. Those
are now zeroed.

### Two wiring gaps this depended on, both found in review

The registrations above were **inert**, so this section originally
claimed more than the code did:

- `CryptoProviderConfiguration` was applied nowhere outside tests, so
`AddCryptoProvider(configure)` never reached the registry in a real
host. The registry now applies every registered configuration when it is
first resolved — which also affects #4207's DI story.
- `PubSubSecurityWrapperResolver` selected
`PubSubAes256CtrPolicy.Instance`, the provider-less static singleton,
ignoring the provider-backed bundles registered for it. A `FipsOnly`
deployment therefore certified while the platform did the work. The
resolver now selects from the registered policies; the container and
`PubSubApplicationBuilder` both supply theirs.

A third, smaller one: `CryptoProviderBuilder.Use` published a
**policy-scoped** random source as the process-wide nonce source, so
`.For(purpose, policyUri).Use(hsm)` redirected nonce generation for
every other policy too. Only an unscoped binding does that now.

## #4206 — a provider can contribute a security policy

Added in review: the policy set was fixed at compile time, so a provider
could contribute key custody but not a *profile*. It is now table-driven
and open, and the blockers #4206 listed are gone.

```csharp
using IDisposable registration = SecurityPolicies.Register(
    new SecurityPolicyInfo("urn:vendor:SecurityPolicy#CustomProfile", "CustomProfile")
    {
        PlatformSupport = () => true,
        SupportedCertificateTypes = [ObjectTypeIds.RsaSha256ApplicationCertificateType],
        IsDefault = true
    });

services.AddOpcUa()
    .AddCryptoProvider(crypto => crypto
        .For(CryptoPurpose.ChannelSymmetric, "urn:vendor:SecurityPolicy#CustomProfile").Use(module))
    .AddSecurityPolicy(customPolicy);
```

- **The reflection is gone.** Four lookup tables were built by
reflecting over the fields of `SecurityPolicies` and
`SecurityPolicyInfo`. They are one explicit table now, which removes the
**last reflection in `Security/Constants`** — so this is a trimming and
Native AOT improvement as much as a feature.
- **`SecurityPolicyInfo` is constructible from another assembly** and
carries the metadata the helpers need, so `IsPlatformSupportedName`,
`GetDefaultUris`, `MapSecurityPolicyToCertificateTypes` and
`GetCurveFromCertificateTypeId` read that table instead of each being
hand-written. Adding a policy is one entry rather than five edits.
- **The dead `#if CURVE25519` conditional is deleted** from
`Security/Constants`.
- Registration is copy-on-write, so the read path stays lock-free.
Shadowing a built-in policy requires `replaceExisting: true` and is
reversible by disposing the registration.

`RegisterLightsUpCurvePoliciesFromOutsideCore` is the acceptance test
the issue asked for: it registers `ECC_curve25519` and `ECC_curve448`
from the test project and asserts they become discoverable through the
public API.

**Registering a policy makes it advertised and resolvable; it does not
supply the cryptography behind it.** For those two curve profiles the
in-tree key agreement is still behind a compile symbol no project
defines plus a BouncyCastle dependency, so a deployment lighting them up
provides the operations through a provider. That division is the point:
the policy set says *what* is offered, the provider says *who* performs
it.

## Removing the gate's re-entrancy

Folded in from #4242, which was merged into this branch.

`ChannelGate` was re-entrant, and that forced the design behind most of
the defects above. A holder that awaits releases its thread, so
ownership could not be tracked by thread identity — it had to live in an
`AsyncLocal<Holder?>`. A logical context is *inherited*, so anything
started while the gate was held inherited the right to re-enter and ran
inside the guarded region alongside whatever started it, unless it opted
out by hand via `LeaveInheritedContext()` at each of eight sites,
enforced by review alone. Five of the defects listed above trace to that
mechanism, including both CI hangs.

So the *requirement* was removed rather than the mechanism, and the
`AsyncLocal` then deleted itself. Every path that re-entered now calls a
lock-free `Core` method (`ForceChannelFaultCore`, `ShutdownCore`,
`ForceReconnectCore`, `CompleteConnectCore`), and three regions stopped
running foreign code under the lock: the `RequestReceived` dispatch is
deferred until the gate is released, `OnTransportError` no longer wraps
the `HandleSocketError` virtual, and the callback setters and
`EndpointDescription` publish a single reference with a volatile write
instead of locking — the last is load-bearing, because
`AsyncResultBase.OperationCompleted` invokes the reverse-hello callback
inline while the gate is held.

`ChannelGate` is now a `SemaphoreSlim(1,1)` behind a `Releaser`;
`Holder`, the thread-identity fallback, `LeaveInheritedContext`,
`IsHeldByCurrentContext` and all eight disclaimer calls are gone, with
the call shape at all 32 sites unchanged. `SaveIntermediateChunk`,
`GetSavedChunks` and `DoMessageLimitsExceeded` gained a `gateHeld`
argument, because the client reaches them both with and without the gate
and must pick the matching teardown — without it an oversized
`OpenSecureChannel` response deadlocked the receive loop against itself.

The remaining paths were not found by reading the code, since that is
what missed them originally. A temporary strict mode made every
re-entrant acquisition throw with its stack, the suite was run under it
until clean, and it was deleted with the re-entrancy it measured. It
caught two sites review had missed: the `EndpointDescription` **property
getter** taking the gate, and the `RequestReceived` dispatch to
application code happening inside the guarded region.

Two deliberate residuals are documented for reviewers: `Dispose` no
longer takes the gate (unavoidable — it is reached from `ChannelFaulted`
with the gate held, where the old re-entrant acquisition excluded
nothing anyway), and the deferred request dispatch builds
`SecureChannelContext` just after gate release rather than under it.

## Testing

New: the three seams and their platform implementations, facet discovery
and resolution precedence, `FipsOnly` refusing a provider that cannot
serve what it was bound to, AES counter mode (including a
non-block-aligned round trip and a check that the counter carries, since
one that did not would silently reuse key stream), `ChannelGate`
(exclusion, re-entrancy across an await, re-entrancy on a reused thread,
and the deadlocks above), the asynchronous channel paths, and the PubSub
policy provider.

Each review finding got a test that fails without its fix:

- `ContendedEntryStillRecordsTheHolderAsync` — established contention
deterministically, then re-entered; failed on the pre-fix gate. Removed
with the re-entrancy it covered; `ChannelGateTests` now asserts the
non-re-entrant contract instead.
- `SecureClientAndTcpListenerKeepChunkOrderUnderConcurrentRequestsAsync`
— 60 concurrent multi-chunk `SignAndEncrypt` requests over a real
loopback listener; failed 3 runs out of 3 with the previous dispatch,
passes 3 out of 3 with the chain.
-
`DependencyInjectionRoutesPubSubCryptoThroughTheRegisteredProviderAsync`
— builds a container, registers a counting provider, wraps a message and
asserts the provider actually performed the encryption and the
signature. This is the assertion the PubSub claim above now rests on.
- `PolicyScopedRandomBindingDoesNotEscapeItsPolicy`.

Two further assertions are the ones that would catch a silent defect: a
provider and the platform must produce **byte-identical** output — a
validated module that disagreed could not interoperate — and with a
software key the returned `ValueTask` must report
`IsCompletedSuccessfully`, which is what makes "ordering is unchanged"
checkable rather than merely asserted.

`SymmetricChannelCryptoBenchmarks` gains a provider-registered variant
beside the existing baseline, so the cost of the indirection is measured
rather than assumed.

Verified locally, every suite at or above its recorded baseline: `dotnet
build UA.slnx -c Release` **0 warnings, 0 errors on all six target
frameworks**; Core **4413** (net10.0); Core.Security **617**, with its
certificate-leak detector clean; PubSub **1350** plus PubSub.Diagnostics
**54** and PubSub.Udp **233**; Features **156**; Subscriptions.Classic
**32**; Server integration **4053**; Client integration **2123**;
MigrationAnalyzer **151** and MigrationAnalyzer.Core **13**. Zero
failures in each.

Core moved from 4388 to 4381 when the gate change landed — eight
re-entrancy tests were removed along with the behaviour they covered,
and one deadlock regression test added — and has since grown to 4413
with the registry isolation, provider-output and security-review tests.
`ChannelGateTests` was rewritten around the new contract — exclusion
across both entry modes, an uncontended asynchronous entry not
suspending, re-entry blocking by contract, and the property that used to
be the hazard: work started while the gate is held is excluded without
having to opt out.

Every CI failure this PR produced was reproduced locally, diagnosed
against a clean `origin/master` baseline in a second worktree, and fixed
at the source. Two hangs were found from `--blame-hang-timeout` dumps
read with `dotnet-dump`. One failure that looked like a candidate was
confirmed **not** to be: an intermittent `Opc.Ua.Aot.Tests` connect
failure, pre-existing on `origin/master` (5 of 8 baseline runs failed,
versus 3 of 14 here).

### The publish request overshoot

`Subscriptions.Classic.PublishRequestCountAsync` failed on the Windows
net10.0 leg with **207** outstanding publish requests against a cap of
`max(maxServerPublishRequest, subscriptions)` = 50. It failed in 2 of 6
pipeline builds on this branch, never on `master` in 13 sampled builds,
and never locally in 12 attempts including under deliberate CPU
contention.

The mechanism is a genuine race.
`ClassicSubscriptionEngine.QueueBeginPublish` was a **check-then-act**:
it read `GoodPublishRequestCount`, compared it against
`GetDesiredPublishRequestCount(false)`, and issued a publish if it was
below. It runs on every publish completion, so *n* completions that
overlap each read the same value, each conclude they are below the cap,
and each issue — overshooting by up to *n* per round. The read also
*lags*: a request only becomes visible to `GoodPublishRequestCount` once
`AsyncRequestStarted` has recorded it, which happens after the request
has already been sent.

That code is pre-existing and was untouched by this PR. What this PR
changed is how hard the race is hit: the server used to hold the channel
gate across request processing, which serialised every request on a
channel, so publish completions arrived one at a time. Dispatching
`RequestReceived` outside the gate — an intended improvement, since a
channel should not serialise on application request-processing time —
lets them complete concurrently.

Rather than change the publish pipeline blind, the race was first made
reproducible.
`ConcurrentPublishReEvaluationDoesNotExceedDesiredRequestCount` drives
64 barrier-released completions against a mocked context whose count
lags the send exactly the way the session's does. It issued **64
requests where 5 were desired** — the same defect the CI leg hit, now
deterministic and running in milliseconds.

The engine now tracks the requests it has in flight and reserves a slot
with a compare-exchange before sending, so the decision and the send are
one atomic step. The reservation is released when the request completes,
when the send is declined, or when it throws. The repro test then issues
at most the desired count.

`StartPublishing` is deliberately left **uncapped**. It is the recovery
valve that refills a pipeline whose requests are outstanding but no
longer expected to return, so gating it on the in-flight count would
remove the only path out of a stalled pipeline. An earlier revision of
this fix did gate it, and that is the one change here that could not be
justified on the evidence — it was reverted.

The assertion was **not** loosened, retried away, or marked flaky: it
caught a real throttling regression earlier in this PR and is worth
keeping sharp.

Validated: the repro test red before the fix and green after;
`Subscriptions.Classic` 32/32 **five** consecutive runs on net10.0 and
once on net48; `Opc.Ua.Client.Tests` 2124 on net10.0 across four
consecutive runs and 2127 on net48; `Opc.Ua.Subscriptions.Tests` 604
passed with this fix in place.

### The SSH.NET advisory that turned CI red repo-wide

Partway through this work every build job began failing with `NU1903:
Package 'SSH.NET' 2025.1.0 has a known high severity vulnerability`
([GHSA-q939-rpr3-3284](https://github.com/advisories/GHSA-q939-rpr3-3284),
`<= 2025.1.0` affected, first patched `2026.0.0`).

Nothing in the dependency graph changed — the advisory was published.
Build 17026 failed on it where build 17000, two hours earlier on an
identical graph, had passed every build job. SSH.NET is not referenced
anywhere in the repository; it arrives transitively through
`Testcontainers.Kafka`.

`master` landed the remediation independently while this was being
investigated (a central transitive pin to `2026.0.0`, which
`CentralPackageTransitivePinningEnabled` exists for). This branch
briefly carried its own identical pin, which made the merge commit hold
**two** `PackageVersion` entries for SSH.NET and fail restore with
`NU1506`. The duplicate is removed and `master` is merged, so the pin
now comes from one place only.

The audit was **not** suppressed: `NuGetAudit` stays enabled and
`NU1903` stays an error. Verified after the merge — `dotnet restore
UA.slnx` reports neither NU1903 nor NU1506, and `dotnet build UA.slnx -c
Release` is **0 warnings, 0 errors** with the audit live.

The remaining red check in build 17026 was not from this change either.
`aot-ubuntu-latest` is the intermittent `Opc.Ua.Aot.Tests` failure
already noted above — `ReconnectSessionAsync` timed out at 30s with 135
of 136 passing. It remains below the `origin/master` baseline rate (4 of
15 sampled here against 5 of 8 on the baseline), and the managed
reconnect paths are green throughout: `Opc.Ua.Client.Tests` 2124 across
four consecutive runs and `Opc.Ua.Subscriptions.Tests` 604.


## Documentation

`docs/CryptoProvider.md` gains sections on substituting the symmetric
primitives, using a key served over a network, and PubSub — including
what cannot be claimed and why, the scope rule for a random-source
binding, and how to supply a provider-backed policy outside the
container. `docs/MigrationGuide.md` covers the `[Obsolete]` channel
virtuals and `DataLock`, and the non-re-entrant gate's contract for
channel subclasses. `docs/WhatsNewIn2.0.md` is updated.
`plans/cryptooffboard.md` is deleted now that the work it planned has
landed.

## Note for reviewers

This touches the secure channel handshake, which is the most
security-critical code in the stack. Nine distinct concurrency and
lifetime defects were found and fixed in it during this work — three
during development, two in review, four from CI — so `ChannelGate`, the
write path and the certificate ownership across the new suspension
points deserve the closest reading.

Five of those nine traced to the gate's `AsyncLocal`, which is why the
re-entrancy was subsequently removed and the `AsyncLocal` deleted. The
wrapper/`Core` split and the two documented residuals in that section
are the parts most worth a second reading.

The #4206 work removes the last reflection from `Security/Constants` and
rewrites the policy lookup tables, so
`SecurityConfiguration.SupportedSecurityPolicies` and the endpoint set
it feeds are worth a second look: an earlier revision of it changed that
set and broke six server tests, which is now covered by
`SecurityConfigurationBuildsExpectedSupportedPolicySet`.

## Related Issues

- Fixes #4206
- Fixes #4207
- Fixes #4208
- Fixes #4210
- Follow-up #4250 — this PR makes the security policy set injectable,
but nothing in the stack resolves `ISecurityPolicyRegistry` from DI yet,
so every production path still lands on the `Default` fallback. #4250
tracks threading it through `Session` and `UaSCBinaryChannel`, which is
what makes the injection points already added here load-bearing.

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [x] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
Copilot-Session: 7a68ca72-83e8-496c-b2f5-3df4c718320b
Copilot-Session: 3f5ab76a-c0ba-4f47-87ac-54d1f4182c6b
2026-08-15 05:23:20 -07:00
Marc SchierandCopilot fac30c45e6 Add MinSupportedSamplingInterval configuration and honor it when revising sampling intervals (#4243)
# Description

PR #4194 removed the unused
`ServerConfiguration.MinMetadataSamplingInterval` and left nothing in
its place. As a result there was no way to populate
`Server.ServerCapabilities.MinSupportedSampleRate` (`i=2272`) —
`ServerInternalData.CreateServerObjectAsync` hardcoded it to `0`.
Separately, the only clamp applied when revising a monitored item's
sampling interval was the per-node
`BaseVariableState.MinimumSamplingInterval`, which defaults to
`MinimumSamplingIntervals.Continuous` (`0`), so reference-server nodes
accepted any requested interval (e.g. 10 ms) unrevised — exactly what
was reported.

This adds a configuration entry **in the exact schema slot #4194
vacated** and enforces it as a lower bound.

## Configuration

- **`ServerConfiguration.MinSupportedSamplingInterval`** — `double`
(milliseconds), default `0`, `[DataTypeField(Order = 17)]`, i.e. between
`MaxNotificationsPerPublish` (16) and `AvailableSamplingRates` (18).
- `ApplicationConfiguration.xsd` — `<xs:element
name="MinSupportedSamplingInterval" type="xs:double" minOccurs="0" />`
in the same position the removed element occupied.
- Fluent API **`SetMinSupportedSamplingInterval(double)`** on
`IApplicationConfigurationBuilderServerOptions`, in the place
`SetMinMetadataSamplingInterval` was removed from.
- The element is added to the six config XML files #4194 touched
(reference / CTT / AOT / GDS use `0`; `test-server-full.xml` uses a
distinctive non-zero value for the round-trip test).

The address-space Property keeps its OPC UA spec name, so
`Server.ServerCapabilities.MinSupportedSampleRate` and
`VariableIds.Server_ServerCapabilities_MinSupportedSampleRate` are
unchanged.

```xml
<MaxNotificationsPerPublish>1000</MaxNotificationsPerPublish>
<MinSupportedSamplingInterval>2000</MinSupportedSamplingInterval>
<AvailableSamplingRates>
```

```csharp
application.Build(applicationUri, productUri)
    .AsServer([endpointUrl])
    .SetMinSupportedSamplingInterval(2000);
```

## Behavior

- `ServerInternalData` now publishes the configured value to
`Server.ServerCapabilities.MinSupportedSampleRate`.
- New `SubscriptionManager.CalculateRevisedSamplingInterval(...)` (two
overloads, alongside the existing `CalculateRevisedQueueSize`)
centralizes the revision rule and replaces the logic that was duplicated
across four call sites — the create and modify paths of
`AsyncCustomNodeManager` and `CustomNodeManager` — which now expose a
`MinSupportedSamplingInterval` property seeded from the configuration
(mirroring how `MaxQueueSize` is initialized).

The rule:

1. A requested interval below zero resolves to the *default sampling
interval*: the **publishing interval of the subscription** on create,
and the item's **current sampling interval** on modify. The modify case
preserves 1.5.378 behavior, so a `ModifyMonitoredItems` call that leaves
the sampling interval unspecified does not silently retune the item.
2. A node declaring `MinimumSamplingIntervals.Continuous` (`0`) for the
`Value` Attribute reports **by exception** and is **not** bound by the
server-wide minimum — the requested interval is returned unchanged.
3. Every other item is raised to `max(nodeMinimumSamplingInterval,
MinSupportedSamplingInterval)`. Attributes other than `Value`, nodes
declaring `MinimumSamplingIntervals.Indeterminate` (`-1`), and
non-Variable nodes are bound only by `MinSupportedSamplingInterval`.
4. `double.MaxValue` is capped to one year (pre-existing behavior, now
in one place).

Event monitored items do not sample and are unaffected.

**Backward compatible:** with the default of `0` the computation is
identical to the previous code for every input, including `Continuous`,
`Indeterminate`, positive node minimums, non-`Value` attributes and
`NaN`. No existing configuration or deployment changes behavior.

Node managers that implement `INodeManager` directly can call the new
public helper to apply the same rule.

## Related Issues

- Fixes #4191

The issue thread also asked whether
`Subscription.MaxNotificationsPerPublish` is revised by the server. It
is (`SubscriptionManager.CalculateMaxNotificationsPerPublish`), but it
was untested and is not observable from the `CreateSubscription`
response, which carries no revised field for that parameter. Four tests
were added that assert it through
`SubscriptionDiagnostics.MaxNotificationsPerPublish` on a privileged
session, covering create and modify, the above-limit, below-limit and
`0` (server default) cases.

## Tests

- **`SamplingIntervalRevisionTests`** (17 unit tests,
`Opc.Ua.Server.Tests`) — the full revision matrix: negative request
resolving to the default interval, the `Continuous` bypass,
`Indeterminate`, node minimum above *and* below the floor, a floor of
`0` being a no-op, non-`Value` attributes, non-Variable and null nodes,
and the `double.MaxValue` cap.
- **`MinSupportedSamplingIntervalTests`** (10 integration tests,
`Opc.Ua.Subscriptions.Tests`) — against a reference server configured
with a 500 ms floor: the capabilities node reflects the configuration; a
node declaring 100 ms is lifted to 500 ms;
`Scalar_Static_Arrays2D_LocalizedText` (1000 ms) wins over the floor;
`CurrentTime` (250 ms) is lifted; a `Continuous` node keeps its 10 ms; a
non-`Value` attribute is floored; `ModifyMonitoredItems` behaves the
same in both directions; event items are unaffected.
- Restored the configuration builder and round-trip test coverage that
#4194 deleted.
- `TestFixture` gained a `protected virtual void
ConfigureServer(ApplicationConfiguration)` hook so a derived fixture can
vary the server configuration before start. Default implementation is a
no-op, so no existing fixture changes behavior.

## Documentation

- `docs/Subscriptions.md` — new **Sampling interval revision** section
with the input table, the four-step rule (including both
negative-interval fallbacks), XML and fluent configuration examples, and
guidance for custom node managers.
- `docs/migrate/2.0.x/configuration.md` — new section documenting that
`MinMetadataSamplingInterval` was removed and
`MinSupportedSamplingInterval` added. Verified against `master378`: the
old setting defaulted to `1000` but was never read, and
`MinSupportedSampleRate` was hardcoded to `0` with no server-wide floor.
The guide therefore stresses that these are **two different settings,
not a rename** — consumers should drop the old element (a default of `0`
reproduces 1.5.378 exactly) and only opt into the new one deliberately,
since reusing the old value would silently introduce a sampling floor.

## Validation

- `dotnet build UA.slnx` — **0 warnings, 0 errors** across all TFMs.
- .NET 10: `Opc.Ua.Server.Tests` 4091 passed,
`Opc.Ua.Subscriptions.Tests` 619 passed (full suite including the new
fixture), `Opc.Ua.InformationModel.Tests` 1063 passed,
`Opc.Ua.Configuration.Tests` 221 passed, `Opc.Ua.Gds.Tests` 119 passed.
- .NET Framework 4.8: new unit tests (200 incl. sampling groups), new
integration tests (17) and configuration round-trip (135) all passed.
- `ConsoleReferenceServer` starts successfully with the updated
configuration file.

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [x] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 79f8090c-b2a3-409c-a5bf-56b6d2a35e70
2026-08-12 17:41:29 +00:00
466c5cb982 Robot intent follow-ups: multi-controller executors, spec fixes, and an MCP tool library (#4195)
Follow-ups to #4165, plus the work that followed from re-checking this
branch against the specification. Everything started as a defect found
by review or by probing the running code; the specification is unchanged
except where noted.

The TLS certificate lifetime fix (#4196) and the OpenUSD work (#4198)
were both merged into this branch. #4196 has since landed on master, so
it no longer appears in this diff. #4198 was closed in favour of this PR
and its content is here.

The MCP trim/AOT work (#4228), the `DataGenerator` null `NodeId` fix
(#4227) and the NodeSet external-parent import fix (#4229) have since
been merged in as well. All three are closed in favour of this PR and
their content is here, described under *Making the MCP libraries trim
and AOT clean*, *A generator that returned the value you opted out of*
and *A NodeSet parent that lived outside the import batch* below.

## A two-arm cell could not be built

`IntentExecution` carried no controller identity, and there was
effectively one `IIntentExecutor` per server. An executor handed an
execution therefore could not tell **which arm** it was for, so a cell
with two `IntentControllerType` instances — an ordinary configuration —
was not expressible through the builder or DI.

Both halves are addressed:

- `IntentExecution` now carries `ControllerId` (`NodeId`, the OPC UA
identity) and `ControllerName`, so one shared executor can discriminate;
- DI gained per-controller registration —
`AddRobotIntentExecutor<TExecutor>(controllerBrowseName)` and an
instance overload — so two genuinely different executors can coexist.

Resolution order is `WithExecutor` → per-controller DI registration →
the single DI executor → a build-time throw. There is still **no silent
fallback** to a rejecting executor; that was a Critical defect fixed in
#4165 and it stays fixed. `IIntentExecutor` is unchanged, so this is
purely additive.

## Declarations that were quietly untrue

- **`Accepts<T>` silently discarded a redeclaration.** Declaring an
intent type twice — say to narrow `cancelSupported` on the second call —
kept the first, wider declaration and said nothing. That is the same
class of defect as the capability-honesty problems #4165 fixed
(`PauseSupported` declaring a pause the host could not perform;
`Aborting` degrading silently to `Buffered`). Identical redeclarations
remain idempotent; conflicting ones now throw `BadInvalidArgument`.
- **`RI-Interop-40010` assumed Annex B item 3 rather than checking it.**
It now requires exact set equality between the OPC 40010
`TaskProgramName` values and the Robot Intent `ProgramType.ProgramId`
values. Both sides are readable from the address space without
commanding the robot, which is what makes the requirement structural
under §12.1.

## Two things the specification requires that this did not do

Re-checking the implementation against the merged draft revision turned
up two genuine violations. Both are fixed, and the NodeSet is untouched
by either.

- **Every graphed mission reported `Failed` on success.**
`MissionRules.SelectTransition` returned `null` for two different
situations — a graph *terminus*, which is the normal success path, and a
branch point whose conditions all evaluated false — and the caller
collapsed both into `Failed`/`NoTransition`. A three-way result
(`Terminus` / `Selected` / `NoConditionMatched`) separates them, so a
mission that runs to its end now completes. The failure reason surfaces
through the inherited Part 10 result container rather than a new member.
- **Facet URIs were never published.** An upstream `may` became a
`shall` in the revision this branch adopts.
`RobotIntentConformanceUris.Facets` held 31 URIs with **zero**
production references — the set existed but nothing emitted it. The
published set is now derived from `RobotIntentFacetCalculator`, the same
authority that already computed `SupportedFacets`, rather than from a
second hand-maintained list that could drift; a reflection test pins the
two together.

## An easy client mistake

`RequestAuthorityAsync` returns a lease the caller must remember to
inspect. Forgetting makes every later submission fail with
`ControlNotOwned` for reasons that are invisible at the call site.
`RequireAuthorityAsync` throws instead, and names the current owner.
`RequestAuthorityAsync` is untouched — inspecting and branching is
legitimate.

## Letting an agent drive the robot

New `tools/Opc.Ua.Mcp.Robotics` gives a language model the intent API as
MCP tools: 36 across discovery, monitoring, direct control and missions,
behind a `Robotics` tool profile, composable into any MCP host exactly
as the existing OPC UA tool packages are. The `IntentViewerClient`
sample hosts them behind `--mcp` (stdio by default, HTTP when `--view`,
since MCP stdio and the in-process viewer would otherwise share stdout),
and the sample gained a pallet scene so an agent can pick and stack
parts and watch the result in the OpenUSD viewer. All the scene logic is
server-side — no viewer or connector changes.

Four gaps in the client API had to be filled first, since the tools are
a thin layer over it and could not have been written honestly without
them: `ReadStateAsync`, `ListOperationsAsync`/`ListMissionsAsync`,
controller-level
`CancelIntent`/`CancelAll`/`Pause`/`Resume`/`Retry`/`ReleaseControl`,
and `WaitForCompletionAsync`.

The tools refuse rather than paper over: a refusal from the server is
returned with its `IntentFailureEnum` and never retried, and command
authority is never acquired as a side effect of a tool call.

**One defect this surfaced:** `--profile robotics` shipped 36 tools that
could not do anything. Every robotics tool resolves a named OPC UA
session and only the connection tools can open one, so with no `Connect`
in the catalogue the whole profile failed. A test had pinned the defect
in place, asserting the profile did *not* contain `Connect` on the line
below the `diagnostics` assertion requiring it. Each package now
declares its own requirement in its registration extension rather than
the host special-casing it, so an application embedding
`Opc.Ua.Mcp.Robotics` directly gets a usable catalogue without
reproducing the host's pairing. `Full` still takes the connection tools
from the core package, so they are never registered twice. The
replacement test states the invariant — a profile exposing
session-scoped tools must expose the tools that open a session — rather
than the instance.

## Making the MCP libraries trim and AOT clean

*Merged from #4228.*

`Opc.Ua.Mcp.Core` is now `IsAotCompatible` on `net10.0`, and the
reflection the analysers then reported is gone. Turning the analysers on
is the point: until now they were not running on these libraries at all
— including on the tool library this branch adds.

- **`OpcUaJsonHelper.Serialize`** went through `JsonSerializer` (IL2026
/ IL3050). The conversion helpers in that class already reduce every OPC
UA value to a closed set — `null`, the primitive scalars, `string`,
`Dictionary<string, object?>` and lists thereof — so the JSON is now
written directly with a `Utf8JsonWriter`.

Output is unchanged, and that is asserted rather than assumed:
`OpcUaJsonHelperTests.SerializeMatchesTheReflectionBasedSerializer`
compares the new writer byte for byte against `JsonSerializer` for every
shape the helpers emit, including all numeric widths, the
custom-formatted scalars, nested sequences and strings that force the
encoder to escape.

One deliberate contract change: arbitrary object graphs are no longer
accepted. Serializing them needs reflection, so `Serialize` now throws
`NotSupportedException` naming the type instead of silently stringifying
it. No call site in the repository passes anything outside the closed
set.

- **`McpSchemaFilters`** used `JsonSerializer.SerializeToElement` on a
`JsonObject`; it now parses the node's own text, which needs no
reflection.

`Opc.Ua.Mcp.Diagnostics` is deliberately **not** marked. It depends on
SharpPcap and on the reflective service-call dissection in
`Opc.Ua.Core.Diagnostics`, neither of which is trim safe — which is why
that package does not opt in either. Two improvements are kept
regardless: `PacketDecodeTools` serializes `DecodedServiceCall` through
a source-generated `JsonSerializerContext`, and
`PacketCaptureTools.ListInterfaces` now carries the
`RequiresUnreferencedCode` / `RequiresDynamicCode` annotations that
`NetworkInterfaceEnumerator.ListLocalInterfaces` already declares, so
the constraint is visible to callers instead of implicit. Nothing is
suppressed.

Marking an assembly `IsAotCompatible` only proves its own IL is clean;
it says nothing about whether the library still functions once
reflection is gone. So `Opc.Ua.Aot.Tests` references `Opc.Ua.Mcp.Core`
and exercises it with JSON reflection disabled, stating what is and is
not true today:

- tool **results** serialize without reflection — this would fail
outright if the `Utf8JsonWriter` change regressed;
- tool **registration** still requires reflection, because the MCP SDK
builds each tool's input schema by asking `JsonSchemaExporter` for a
`JsonTypeInfo` of every parameter type. Without a source-generated
context covering the tool signatures — and with the injected
`OpcUaSessionManager` being described rather than treated as a service —
that throws `NotSupportedException`.

The second test asserts the throw. It documents the remaining gap and
turns red the moment someone closes it, rather than leaving it to be
found in a published binary. The package README says the same thing in
prose.

**Two pre-existing issues this surfaced, both outside this PR:** pulling
`Opc.Ua.Mcp.Diagnostics` into an AOT publish reports `IL2046` / `IL3051`
on `NicCaptureSource.StartAsync`, which is annotated
`RequiresUnreferencedCode` / `RequiresDynamicCode` while the
`ICaptureSource.StartAsync` it implements is not, and `IL2075` on
`ServiceCallReassembler.GetCollectionCount` / `GetPropertyString`, which
call `Type.GetProperty` on the result of `GetType()`. Happy to file
these separately if useful.

## A generator that returned the value you opted out of

*Merged from #4227. Fixes #4226.*

`GetRandomNodeId(useBoundaryValues: false)` could still return
`NodeId.Null` — one of the boundary values the same method offers when
boundary values *are* requested. A caller that opted out should not
receive one, and `GetRandomExpandedNodeId` builds on it and inherited
the same behaviour.

The `IdType.Opaque` branch is the practical path:
`GetRandomByteString()` draws its length with
`NextInt32(MaxStringLength)`, which is inclusive of zero, and a
zero-length opaque identifier in namespace 0 satisfies `NodeId.IsNull`.
With three namespaces and `MaxStringLength` at 10 that is roughly **one
call in 130**. A numeric identifier of `0` in namespace 0 is null too,
at around one in four billion.

The draw is now repeated while the result is null and boundary values
were not requested. Guarding the result rather than the individual
branches covers every identifier type, including the numeric case,
rather than only the one that happens to be reachable today. The
`useBoundaryValues: true` path is untouched, so boundary values remain
available when they are asked for.

Four tests in `tests/Opc.Ua.Core.Tests/Types/DataGeneratorTests.cs` loop
20,000 draws, because at one call in 130 a single draw proves nothing.
Against the **unmodified** generator they fail on draw 93 and draw 1346.
Two of the four exist to keep the fix honest rather than to test the
bug: `GetRandomNodeIdStillProducesEveryIdentifierType` catches a "fix"
that simply stopped emitting opaque identifiers, which would satisfy the
null assertions while silently narrowing the generator, and
`GetRandomNodeIdWithBoundaryValuesStillYieldsThem` confirms the leak was
closed rather than the feature removed.

**How it was found:** an intermittent downstream test failure. A test
server initialising a static `NodeId`-valued variable via
`TestDataSystem.ReadValue` occasionally stored `NodeId.Null`; the
encoder correctly writes that as JSON `null`, and a consumer asserting a
value was present failed about one run in five — never reproducibly in
isolation. It only surfaced under load because `UnsecureRandom.Shared`
is a fixed-seed, process-global generator shared between `DataGenerator`
and OPC UA transport jitter, so the number of draws preceding
address-space initialisation depends on what else is running in the
process.

## A NodeSet parent that lived outside the import batch

*Merged from #4229.*

`UANodeSetHelpers.LinkParentChildRelationships` builds its lookup table
from **only the nodes in the current import batch**, links a child when
the parent is found — and then cleared `instance.Handle`
**unconditionally**, which is exactly where `Import` had stashed the
authored `ParentNodeId`. A node whose parent lives in another NodeSet,
or is owned by another NodeManager, therefore lost that parent
**silently** at import, and nothing downstream could recover it.
`RuntimeNodeSetNodeManager.CreateAddressSpaceAsync` already has a step
that wires references to external node managers; the parent link never
reached it.

Such a parent is now recorded rather than discarded, and exposed through
`UANodeSet.TryGetUnresolvedParentNodeId`. A parent that resolved
normally inside the batch is **not** recorded, so a caller does not
re-wire references that already exist. The record lives in a
`ConditionalWeakTable`, so it does not keep an imported node alive and
does not widen `NodeState` — whose `Handle` is a general-purpose slot a
caller may legitimately use for its own purposes, and so is not a safe
place to leave the value.

`RuntimeNodeSetNodeManager` consumes it to report the one case that
cannot be repaired automatically. In NodeSet2 the `ParentNodeId`
attribute is a *hint*; the authoritative edge is the entry under
`<References>`, which the reverse-reference pass already turns into an
external reference. A node that names an out-of-manager parent but
carries **no such Reference** materializes with no path from that
parent, and no ReferenceType can be inferred to synthesise one — so it
is reported as an authoring defect rather than guessed at or silently
accepted.

This is deliberately **not** a fix for a specific address-space symptom.
It removes a silent loss of authored information and gives callers the
means to act on it. Whether any particular orphaned-node report is
caused by this path, or by namespace-index translation elsewhere, still
needs separate diagnosis.

**Changed while merging.** As authored in #4229 the accessor was
`GetUnresolvedParentNodeId`, returning `NodeId?`. `NodeId` is a readonly
struct implementing `INullable`, so that was a `System.Nullable<NodeId>`
wrapped around a type that already carries its own null representation —
which this repository excludes in favour of an `IsNull` check, and it
asks for `TryGet` over casting on struct types. The tests
correspondingly asserted `Is.Null` against a struct, which the testing
rules also exclude. It is now `bool
TryGetUnresolvedParentNodeId(NodeState, out NodeId)`, yielding
`NodeId.Null` when there is no unresolved parent. The API is unshipped —
it arrives with this branch — so nothing depended on the previous shape.
Both tests were re-verified by mutation after the rewrite: disabling the
record in `LinkParentChildRelationships` still fails
`ImportKeepsAParentThatIsNotInTheSameBatch`.

## Dependencies

- **OpenUSD to `0.7.0-alpha`.** All 11 issues we filed upstream are
fixed, so the workarounds they justified are gone and the parts of the
pump and generator samples that were blocked on them are implemented.
- **ModelContextProtocol to `2.1.0`** across all five MCP tool libraries
and the executable. No code changes were needed — the surface we use is
unchanged in 2.x — but central package management required a cascade of
pins, each commented where it sits. Both transports were verified
against a running server rather than assumed. MCP 2.x is stateless (no
`initialize`, no `Mcp-Session-Id`); an OPC UA session is application
state addressed by a caller-supplied name, which fits that model but
does assume process affinity, and that assumption is now written down
rather than implied.

## Infrastructure

The `code coverage` gate was measuring nothing on this branch and
reporting success. It is fixed and now enforced, which immediately
exposed real gaps — most usefully `RoboticsIntentJson`, which parses
agent-supplied JSON (untrusted input from a language model) and had no
tests at all. It is now at full line coverage in CI. Patch coverage is
**90.20%** against a 75% floor.

The `netstandard2.1` build leg was also failing. The MCP projects build
as empty shells under a legacy `CustomTestTarget`, and the viewer sample
referenced them on the target framework alone, so it tried to resolve a
net10.0 shell from net8.0. The sample now derives MCP support from
whether those projects are actually being built.

## From review

A review pass over the branch found two real defects, both fixed.
`RoboticsIntentJson` parses JSON written by a language model, so every
malformed shape it can be handed is reachable input; it indexed pose
arrays without checking their length and enumerated properties without
checking their kind, so a short or wrongly-typed array escaped as
`IndexOutOfRangeException` or `InvalidOperationException` rather than
the argument error the tool descriptions promise the agent. Separately,
`IntentOperationHandle` treated a zero `QueuePosition` as "not observed"
and discarded it, so a handle kept reporting the last queued position
after the server had said the operation left the queue.

The pose validation immediately caught a latent test defect: the pallet
scenario interpolated doubles into JSON with the current culture, so
under a comma-decimal culture `[0.12, 0.16, 0.28]` became a six-element
array. It passed only because that submission is expected to be refused
for want of authority, so the wrong coordinates were never used.

A third review finding — that a default-constructed
`RobotIntentControllerState` hands out a null `NodeId` — was checked and
rejected: `NodeId`, `QualifiedName` and `LocalizedText` are readonly
structs here, so `default` is the null value and `IsNull` is `true`. The
tests asserting that invariant are kept.

A second review pass over the merged branch found two more, both fixed
and both about an error surfacing as the wrong kind of failure rather
than about a wrong result:

- **Malformed agent JSON did not arrive as an argument error.**
`RoboticsIntentJson` turns every *validation* failure into an
`ArgumentException` — a wrong root kind, a missing property, a short
pose array — but three `JsonDocument.Parse` calls and the NodeId parse
were unguarded. A syntax error escaped as `JsonException` and an
unparseable NodeId as `ServiceResultException`, which are the two shapes
a language model is most likely to produce. That is the same defect
class as the pose/kind checking above: a caller separating bad input
from a genuine fault had to know to catch three unrelated exception
types. Parsing now goes through one helper that reports a syntax error
as an `ArgumentException` naming the argument, keeping the
`JsonException` as the inner exception so the position is not lost, and
the NodeId goes through `NodeId.TryParse` rather than `Parse`,
collapsing its two failure modes into one.
`MalformedIntentJsonIsRejected` had asserted
`InstanceOf<JsonException>`, pinning the behaviour rather than the
intended contract; it now asserts `ArgumentException` like every
neighbouring test, and three tests cover the newly guarded paths.
- **`ConditionalWeakTable.Add` throws on a duplicate key.** Not
reachable today, but `TryGetUnresolvedParentNodeId` documents `Handle`
as a general-purpose slot a caller may use for its own purposes — and a
caller doing exactly that before re-importing into the same collection
would take a hard throw from inside the import pipeline. Removing first
makes the most recent import win. `AddOrUpdate` would say this more
directly but does not exist on `netstandard2.0`.

## Deliberately not fixed here

`FastenIntentDataType.Joint` is refused when the Server exposes no OPC
40450/40451 model, and a client cannot discover that before calling.
That is **not fixable in this repository**: §5.4.2 makes `Joint` the
defining mechanism while §11.3 says the parameters otherwise stand
alone, and `IntentCapabilityDataType` declares capabilities at
intent-type granularity with no member-level mechanism anywhere in the
model. It is a specification gap, raised as S4 on
[marcschier/opcua-drafts#60](https://github.com/marcschier/opcua-drafts/pull/60)
rather than worked around with a bespoke mechanism the spec does not
define.

## Validation

`dotnet build UA.slnx -c Release` on the merged branch — **0 errors, 0
warnings**, with the AOT analysers now running over `Opc.Ua.Mcp.Core`.

| Suite (net10.0) | Tests |
|---|---|
| `Opc.Ua.Core.Tests` | 4247 (86 skipped) |
| `Opc.Ua.Robotics.Tests` | 540 |
| `Opc.Ua.OpenUsd.Tests` | 909 |
| `Opc.Ua.Tools.Tests` | 419 |
| `Opc.Ua.Server.Tests` — `RuntimeNodeSet` | 94 |
| `Opc.Ua.Robotics.Intent.Tests` | 22 |
| `Opc.Ua.Aot.Tests` — `McpAotTests` | 3 |

0 failures. `Opc.Ua.Tools.Tests` rose from 409 to 419 with the
serializer-equivalence tests from #4228 and the malformed-JSON tests
from the second review pass, and `Opc.Ua.Core.Tests` covers the
`DataGenerator` tests from #4227 and the import tests from #4229.
`UANodeSetHelpers` also passes on **net48** (5/5). The MCP
agent-usability grader scores Core 100 / Full 100.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Copilot-Session: a248a589-9a20-4372-868e-5d347e57001b
Copilot-Session: 9e6a5abf-3299-4cd1-9855-010fedbf0ad8
Copilot-Session: a0718e8a-a158-45c5-929d-e1d6c0982431
2026-08-11 13:03:36 +02:00
Marc Schier 0612a43fe4 Pluggable cryptography and hardware-held private keys (#4192)
Makes the stack's cryptographic operations replaceable - by another library, an offboard service, or hardware (TPM 2.0 / HSM / PKCS#11 token / cloud KMS) - with no performance cost in the default configuration, and extends this to certificates so a private key need never exist in process memory.

Also fixes three pre-existing defects found while validating: STACKGEN001 erroring for every compilation the stack generator was merely loaded into, certificates failing to load from paths past MAX_PATH on Windows, and the MonitoredNode2 tests starving the thread pool.

Fixes #4190
2026-08-09 12:40:26 +02:00
Copilotandmarcschier d8aca69444 Remove unused MinMetadataSamplingInterval configuration option (#4194)
## Description

Server-side `MonitoredItem` sampling interval revision is based on the
per-node `BaseVariableState.MinimumSamplingInterval` attribute, not on
any global server setting —
`ServerConfiguration.MinMetadataSamplingInterval` was dead configuration
that was never read by any code path. Per maintainer feedback, this PR
removes it instead of wiring it into revision logic that was never meant
to consume it.

Separately, the concern that `Subscription.MaxNotificationsPerPublish`
isn't revised by the server was verified against existing coverage:
`CreateSubscriptionWithNotificationLimitsUsesEffectiveLimitAsync` /
`ModifySubscriptionWithNotificationLimitsUsesEffectiveLimitAsync` in
`SubscriptionTests.cs` already assert the server clamps a
client-requested value down to the configured server limit (e.g.
requested `25` vs. server limit `10` → revised `10`).

### Removed `MinMetadataSamplingInterval`
- Dropped the `ServerConfiguration.MinMetadataSamplingInterval` property
(`ApplicationConfiguration.cs`) and its XSD element
- Dropped `SetMinMetadataSamplingInterval` from
`IApplicationConfigurationBuilder` / `ApplicationConfigurationBuilder`
- Removed the element from sample and test server configuration XML
files (`Ctt.ReferenceServer.Config.xml`,
`Quickstarts.ReferenceServer.Config.xml`, GDS test configs,
`test-server-full.xml`)
- Updated `ApplicationConfigurationBuilderTests` and
`ConfigurationRoundTripTests` to drop assertions on the removed property

## Related Issues

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [ ] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

<!-- START COPILOT CODING AGENT SUFFIX -->

- Fixes #4191

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: marcschier <11168470+marcschier@users.noreply.github.com>
2026-08-08 17:11:42 +02:00
Marc SchierandCopilot 2b44fcad22 Robot intent: a task-level command API with a Part 10 lifecycle (#4165)
# Description

Implement the draft **OPC UA — Robot Intent** companion model end to
end: task-level motion verbs, a Part 10 lifecycle, a server hosting
surface, a client, two samples and a live integration suite. It replaces
the opt-in convention API merged in #4127 with an implementation
generated from a companion information model.

## Why

OPC 40010-1 *Robotics* describes robot **topology** in detail and
defines **no motion verbs at all** — its entire actuation surface is
`Start`, `Stop` and loading a named program. A conformant client can
discover everything about a robot's construction and cannot ask it to
move anywhere. #4127 filled that gap with ten verbs in an
application-owned namespace, resolved by BrowseName, and the file said
what it was: *"opt-in, explicitly non-normative industrial operation
conventions"*.

That contribution established a **vocabulary**. It established no
**lifecycle**, and the lifecycle is the harder half.

A motion takes seconds; a pick takes a minute. OPC 10000-4 §5.12.2
discards a method result when the Session ends *"independent of the task
actually performed at the Server"* — so a synchronous motion method does
not merely time out, it **loses the outcome of work that has already
physically happened**. OPC 10000-10 §4.1 gives the OPC Foundation's own
resolution: a Method performs a calculation, a **Program** runs a batch
process or a machine tool part program.

So `SubmitIntent` returns as soon as the intent is *admitted*, and what
it returns is a NodeId — an `IntentOperationState` (a Part 10 program
instance) the client subscribes to for progress and reads for the
result.

## What changed

**Model and shared code** — `Opc.Ua.RobotIntent.NodeSet2.xml` is
source-generated in `Opc.Ua.Robotics`, so the enums, the polymorphic
intent structures, `IntentOperationState : ProgramStateMachineState`,
the method states and the typed clients derive from the model rather
than being hand-written. Its only `RequiredModel` is the base UA
namespace, so a server can adopt it without OPC 40010 or DI. `PoseMath`
implements the specification's Annex C conversion between its unit
quaternion and the core `ThreeDFrame` — including the `asin` clamp that
stops a pole orientation becoming a domain error, and the
non-negative-`w` representative that makes two servers agree on four
numbers. `FrameTree` composes transforms along the frame tree.

**Verbs are a DataType hierarchy, not one Method each.** A single
submission and a mission step are then the same shape, and a new intent
is a subtype rather than a new method — which is what
`AddOperation<TRequest,TResponse>` was working around.

**Server** — `IntentControllerHost` owns admission in the
specification's order, the queue with PLCopen buffer modes, blending,
cancellation *with the server's right to refuse*, missions with a
committed base and a revisable horizon plus an IEC 61131-3 step graph,
safety-aware refusals, real-time channel brokerage, and the capability
declaration. All thirteen Methods are wired; command authority and
channel leases are released when the holding Session closes; every
client-supplied NodeId is validated against the controller being
commanded (clause 11.3). `RobotIntentNodeManager`, the fluent
`IIntentControllerBuilder` and `AddRobotIntent`/`ConfigureRobotIntent`
make it reachable, and `RobotIntentFacetCalculator` computes which of
the specification's facets an instance actually satisfies.

**Client** — `RobotIntentClient` discovers
`Server/RobotIntent/Controllers` and reads what a robot accepts;
`IntentOperationHandle` subscribes and completes on a terminal state,
recovering the result after a reconnect because clause 6.7 promises it
survives; `CommandAuthorityLease` and `RealTimeChannelLease` manage the
two exclusive resources; fluent builders cover every intent and mission.

**Samples** — all robotics samples move under `samples/Robotics/`.
`IntentEnabledRobot` is one UR5e-style offset-wrist arm on a bench,
declared completely enough to show what a conformant server publishes,
with a simulated safety source so the clause 10.4 refusals are
demonstrable. `IntentViewerClient` turns a **click on a target prim in
the OpenUSD viewport** into an intent and watches the arm execute it; it
also runs headless, which is how CI exercises it.

**Intents execute serially**, which satisfies every `BlockingMode`
constraint by construction: the specification forbids beginning a
`Single` or `Hard` intent while another executes and merely *permits*
`None` and `Soft` to overlap.

The convention API (`RoboticsOperationConventions`,
`RoboticsOperationsBuilders`, `RoboticsOperationsClient`) is removed.

### On safety — what this deliberately does *not* claim

The interface is **non-safety-rated**, and that is a property of the
technology rather than a scoping choice. OPC 10000-15 carries cyclic
safety data from a SafetyProvider to a SafetyConsumer; the consumer's
`RequestSPDU` holds an identifier, a monitoring number and one octet of
explicitly **non-safety** flags, so a caller has no channel through
which to supply safety-rated arguments. Every safety fieldbus
(PROFIsafe, CIP Safety, FSoE, openSAFETY) expresses a safety command as
a **continuously asserted cyclic signal**, because the integrity
argument rests on the fail-safe state that follows when assertion
*stops* — and a Method call has no defined behaviour when it stops being
called.

What the host does instead is **observe and refuse**:
`UpdateSafetyState` is how the application reports what the safety
system is enforcing, and admission then refuses on the same values a
client can read, so a refusal is explainable from the address space
rather than from Server-internal state. It may never *instruct* the
safety system, and no Method here commands a safe motion function,
changes an operational mode or clears a stop.

## Defects this found in the specification, fixed upstream

Implementing a specification is the only way to find out whether it can
be implemented. Seven defects went back to
[marcschier/opcua-drafts#47](https://github.com/marcschier/opcua-drafts/pull/47)
rather than being worked around here:

- **Refusal was unobservable.** Clause 6.2 orders six distinct refusals
and clause 5.8 calls the failure set "small and diagnosable on purpose"
— but `SubmitIntent` returned only `IntentId` and `Operation`, so a
client could see *that* something was refused and never *which*. It now
returns `Accepted`, `Failure` and `Message`, and clause 6.2 states that
a refusal returns `Good` rather than substituting a Bad `StatusCode`.
- **The Part 10 promotion was illegal.**
`IntentOperationType.ProgramDiagnostic` was declared as a Property of
`PropertyType`; OPC 10000-10 declares it a Variable of
`ProgramDiagnostic2Type` reached by `HasComponent`. The declaration
added a *second* member beside the inherited one instead of promoting it
— which is precisely why an earlier version of this branch had deleted
it. Correcting the TypeDefinition made it generate cleanly with **no
change to the curated Core**.
- **Clause 9 said nothing about the Method surface.** A server could
declare `MissionsSupported` true and omit `SubmitMission` entirely,
because the mission and channel Methods are Optional. This
implementation did exactly that until an integration test caught it. A
fourth honesty rule and a table now fix which Methods each declaration
implies.
- **Conformance was not machine-readable, and two implementations
disagreed.** Clause 12 defined conformance in terms of facets and gave a
Server nowhere to publish which ones it satisfied, so every client had
to re-derive Table 12.2 from the address space. This repository proved
why that fails: the server''s `RobotIntentFacetCalculator` and the
client''s `RobotIntentRules.DeriveFacets` each implemented clause 12.2
independently and **disagreed on essentially every row** — the client''s
`Blending` was `BlendingSupported` alone where the server also requires
all four blending buffer modes, its `QueuedIntents` was `MaxQueueDepth >
0` where the server also requires `Buffered`. A client and server from
the same release answered "does this controller conform?" differently,
and both were reading the specification correctly, because several rows
are behavioural and no amount of browsing settles them.
`IntentCapabilitiesType` now carries **`SupportedFacets`**, exactly as
OPC 10000-5 does with `ServerCapabilitiesType.ServerProfileArray`,
RI-Base requires it, and clause 12.2 separates structural requirements a
Server shall meet before listing a facet from attested ones governed by
clause 9.
- `WaitIntentDataType.Signal` was unbounded where clause 11.3 has to
check it; §11.3 gained a table fixing the expected type of every
NodeId-valued member; §5.7.0 gave `Ready`/`ActiveIntent`/`ActiveMission`
normative meaning; §6.9 bounded `RequestedLease`; §6.5 and §6.4 now say
what a server that cannot differentiate `StopMode` must do, and which
stop a superseded intent gets.

## Bugs the tests and reviews caught

Each of these would have been silent in the field:

- **The execution engine was never wired into the public API.**
`IntentControllerBuilder.RegisterAsync` built the address space and
never started an `IntentControllerHost`, so through the documented
`AddRobotIntent` → `ConfigureRobotIntent` path **every Method returned
`BadNotImplemented`** and the registered `IIntentExecutor` was never
resolved. A browsable address space is not a working robot interface,
and only a live integration test showed the difference.
- **NodeId scoping failed open on an empty index.** A controller
advertising `CallProgramIntentDataType` with no published `ProgramType`
accepted an *arbitrary* NodeId as `CallProgram.Program` — and
`CallProgram` runs code the server holds.
- **Blending completed the predecessor at submission time** and
abandoned its motion, telling the client it succeeded and publishing an
all-zero pose at the origin as a genuine `AchievedPose`.
- **Mission base immutability compared only identifiers**, so a client
could keep the ids and swap the *motion* of an already-committed step.
- **`FinalResultData/Result` was never registered** with the node
manager: Browse showed it, Read returned `BadNodeIdUnknown` — so clause
6.7's promise to a Part 10 client did not hold.
- `DisposeAsync` disposed primitives out from under in-flight executor
code; re-using a terminated `IntentId` destroyed the retained result and
duplicated a NodeId; neither side registered the Robot Intent
encodeables, so `Pose3DDataType` did not decode; host startup was hooked
to a task that ran in only one hosting shape.
- The result was published **after** the state went terminal;
capabilities were resolved against a stale namespace table; an empty
`ContentFilter` arrives as an empty element array rather than a null
filter, so testing only for null made every unconditional mission
transition silently untaken — a mission would run its first step and
stop.

### Found by a later test-quality audit, after the above was written

An audit of the test suite itself found five tests whose **names**
asserted a normative requirement while their **code** asserted something
weaker or nothing at all. The worst **fabricated the answer it
checked**: a helper caught a decode failure and invented "5 supported
intents, 6 axes, all facets true", so six capability-honesty assertions
across four tests could pass while reading nothing from the server. The
fallback is gone and the suite passes with honest reads.

Chasing the facet gaps it reported led to the clause 12 defect above.
Two further defects followed from completing that work:

- **`RI-Interop-40010` was never computed**, and the code documented the
omission as impossible to fix "because the calculator receives only a
Robot Intent controller, not the linked OPC 40010 model". That was
wrong: Annex B's structural requirement is an **inverse**
`HasIntentController` reference, reachable from `IntentControllerState`
— and the integration suite was already browsing exactly that. A server
implementing Annex B could not claim Annex B.
- **The published claim could go stale.** `SupportedFacets` was a
snapshot taken during `RegisterAsync`, so a reference attached
afterwards left it wrong. It is now bound through `BindRead` and
recomputed on read, so the claim tracks the address space by
construction rather than by discipline — which matters for anyone
bolting Robot Intent onto an existing OPC 40010 node manager, where the
attach ordering is often not theirs to choose.

Two tests that **could not fail** were also replaced: one asserted
`AccessLevel` equals `CurrentRead` to pin a read-only marking, but
`BaseVariableState` initialises every variable to exactly that, so
deleting the marking left it green; it is now a write expecting
`BadNotWritable`, including a real OPC UA `Write` service call over a
live session.

Finally, a build break that a plain build hides: `RoboticsAotTests` used
`out string?` in a project declaring `<Nullable>disable</Nullable>`.
Building the project **without** `-f` suppresses `CS8632` through
`NoWarn=nullable` and succeeds; building it **with** `-f net10.0`
resolves `NoWarn` differently, `CS8632` fires, and
`TreatWarningsAsErrors` makes it an error. CI builds per-TFM, so this
would have failed there while passing every local build to that point.

## Testing and coverage

| | |
|---|---|
| `dotnet build UA.slnx -t:Rebuild` | **0 errors, 2 warnings** — both
pre-existing `CA1861` in `tests/Opc.Ua.Tools.Tests`, a file this PR does
not touch |
| **Whole `UA.slnx` test suite, net10.0** | **50 of 52 assemblies fully
green** (measured at `40d9cf213`, before the `master` merge; the other
two are explained below) |
| `Opc.Ua.Robotics.Tests` | **467** net10.0, **447** net48 |
| `Opc.Ua.Robotics.Intent.Tests` (live client <-> server) | **20** on
net10.0 and net48, run repeatedly |
| `Opc.Ua.OpenUsd.Tests` | **904** after merging `master` (664 before;
the rest arrive with #4160 / #4162 / #4180) |
| `Opc.Ua.Aot.Tests` | **121/121** |
| `Opc.Ua.Di.Tests` (regression from the sample move) | **364/365**, one
pre-existing skip |
| **Changed-line coverage** | **90.7 %**, no file below 80 % —
comfortably above the enforced band, which after #4158 applies only to
patches larger than 100 changed lines |

The two non-green assemblies are **not** caused by this branch. Rather
than assert that, I ran the same selections at the merge-base
`ae241b662` on the same machine:

-
`ServiceCallReassemblerTests.PrivateRequestSummaryFormatsKnownRequestKinds`
expects `12.5` and gets `12,5` — a culture-sensitive assertion failing
on a European locale. Fails 4/4 on **both** commits.
-
`CertRotationLiveTests.L2Cert2RotateCertificateDuringServerRestartRecoversSharedChannelAsync`
fails on a teardown count. Fails 4/4 on **both** commits.
- A third failure seen once, AOT `FindServersAsync` with
`BadSecureChannelClosed`, did not reproduce: 4/4 on retest and 121/121
in the final run. Environmental.

Two things are worth calling out because they would otherwise be
invisible:

- `tools/**` is **not** in the `coverage-thresholds.json` ignore list,
and no test project referenced the OpenUSD tools assemblies — so their
changed lines counted as uncovered and the real patch figure was 75 %,
exactly the blocking threshold. Rather than widening the ignore list,
the pure decisions in the viewport host (pointer-to-physical-pixel
conversion, `RenderPickRequest` construction, stale-retry, backend
discovery, pick-mode selection) were separated from the Avalonia/native
shell and tested headless against a fake picking backend.
- `dotnet build UA.slnx` **hides warnings on unchanged projects**; only
`-t:Rebuild` surfaces them. That is how a `CA2263` introduced by a net48
portability fix survived several "zero warning" builds.

The multi-target requirement earned its keep repeatedly: it caught a
default interface implementation, `ArgumentNullException.ThrowIfNull`,
`string.Create` with an interpolated handler,
`ValueTask.FromResult`/`CompletedTask`, `Task.WaitAsync`, generic
`Enum.GetValues` and generic `Enum.IsDefined`, and a non-generic
`TaskCompletionSource` — none of which the net10.0 build complained
about. A net10.0-**only** hang in the simulated executor and two
load-sensitive flaky tests were also found and fixed at the cause.

### Merged with `master`

`master` (through `e73e71184`) is merged in as `08205d81d`. Four
conflicts, all where the two branches touched the same robot and OpenUSD
surfaces, and none resolved by dropping a side:

- #4162 added six files to `samples/MinimalRobotServer/` while this
branch moved that directory to `samples/Robotics/MinimalRobotServer/`.
They are kept at the moved path, and `UA.slnx` takes the union of both
sides' new projects.
- #4160 replaced `object` with a `UsdValue` union and rewrote `Flatten`;
this branch had reformatted the same method and fixed a path in its doc
comment. Git produced a hybrid that did not compile. The resolution
keeps `master`'s `UsdValue` arm and `Flatten(UsdValue)` overload in this
branch's block-bodied form, with the path fix retained.
- `master` inserted `FindStageCamera` directly before two methods this
branch had relocated, so the merge duplicated `WriteStageUsda` and
`GetPrivateStateRoot`. Only `FindStageCamera` is genuinely new —
`master`'s diff shows the other two as unmodified context — so the
duplicates are dropped and this branch's `internal` versions kept,
including the `GetPrivateStateRoot(string?)` overload the connector
tests use to stay out of the real user profile.
- `master` moved the OpenUSD stack to `0.4.0-alpha`; this branch pins
`OpenUsd.Rendering` in the test project so the renderer-pick tests can
reach the picking backend. Left at `0.1.0-alpha` that pin is below what
the viewer now resolves transitively, which is `CS1705`. The pin follows
`master`.

CI was green on `baaf35e9` with **190 checks passing and none failing**,
across every build leg (net472 / net48 / netstandard2.0 / netstandard2.1
/ net8.0 / net9.0 / net10.0, Debug and Release) and the full test matrix
on Windows and Linux. Since then `master` has been merged twice more and
two CI-stability fixes landed (see below), so the current head is
re-running. Locally, `dotnet build UA.slnx -t:Rebuild` gives **0
errors** and the 2 pre-existing `CA1861` warnings; Robotics **467**
net10.0 / **447** net48, Robot Intent **20** on both, OpenUSD **904**,
AOT **121/121**, source generation **3771**.

### Review round

Five reviewers over disjoint areas found defects worth calling out, all
fixed in `3ffec2c1`:

- **A refused mission step was reported `Succeeded`.** The advance path
returned the same `false` for "steps exhausted" and "step refused", so a
protective stop between steps told a supervisory system the mission had
completed while the robot stood halted with work unexecuted.
- **Three attacker-controlled NodeIds reached the executor unvalidated**
— `Pick.Tool`, `Place.Tool`, `ToolChange.DockStation`. `DockStation`
drives a physical tool-exchange motion to a location the server never
authorised. The replacement test enumerates NodeId members by reflection
so the next one added cannot be missed.
- **A lock-order inversion that loses a stop.** `CanCancel` and the
mission condition evaluator ran under the host lock while the executor's
own thread re-entered it via `ReportBlendBegin`.
- **A non-terminal executor outcome killed the pump** from outside the
`try/catch` that exists because the executor is untrusted — `Ready`
stayed true and submissions kept being accepted while nothing moved.
- **`Pause` published `Suspended` while the robot kept moving.** Now
queue-only and honest about it; the specification gained the matching
rule ([opcua-drafts
`357a558`](https://github.com/marcschier/opcua-drafts/pull/47)).
- **`RI-RealTimeChannel` and `RI-Safety` were false claims** — granted
on an empty folder with no methods, and on the mere presence of a
Mandatory node.
- **The Part 10 promotions never promoted.** Namespace-1 BrowseNames
declared second members beside the inherited ones; the conformance test
could not see it because its lookup stripped the prefix. Fixed upstream
and regenerated.
- **Renderer picking never worked.** The reflective probe bound a
renderer that is not a picking backend and throws off its owner thread.
It now binds only `IRenderPickingBackend`, falls back immediately and
loudly, and the docs say plainly that renderer picking is unavailable
with this package version.
- **The client lost command authority the instant it gained it** —
monitored items report the current value first, and the lease treated
every notification as a loss.

### CI stability fixes for master-side failures

The CI split in #4158 turned on legs that had never run, and two of the
failures they exposed were real bugs on `master` rather than anything
this branch introduced. Both are fixed here because they were blocking
every branch:

- **ECC key generation was broken on macOS.** `ExportExplicitParameters`
throws `PlatformNotSupportedException` there — Apple's
SecurityTransforms supports named curves only — and it was called for
exactly one value, the curve order `n`. The four curves OPC 10000-12
admits have published orders, so those are carried directly, with
`CurveOrderTableMatchesThePlatform` checking each against the platform's
own exported order wherever export works, so the constants cannot
silently drift. This accounts for the two ECC failures in
`test-macOS-latest-Server`.
- **The certificate-leak detector raced asynchronous disposal.** It
polled a fixed budget and reported whatever it saw, which cannot
distinguish a genuine leak (count steady) from a suite still draining
fire-and-forget disposals (count falling) — on a loaded agent that
produced `Certificate leak detected: 2 instance(s)` with every test
passing. It now waits for the count to **settle**, so a real leak is
reported sooner than before while a slow drain gets as long as it keeps
progressing. Shared by every suite that asserts no certificate leaks.

The remaining macOS failures on `master` (`Gds`, `Tools`,
`Redundancy.Samples`, `aot-macos`) have different root causes, are not
reproducible without a macOS host, and are **not** addressed here.

### Merged with `master` again

`master` through `416d619c4` (#4158, the CI matrix split and graduated
coverage bands) is merged in as `08ae4528`. One conflict, in
`docs/DeveloperGuide.md`, where both sides had deliberately rewritten
the coverage-gate section:

- `master`'s rewrite is kept in full — graduated `patch.bands`, Codecov
being informational-only, and where the numbers surface per CI system.
- This branch's paragraph about the `ignore` globs is kept too, re-sited
ahead of those subsections. I re-checked it against the merged
`coverage-thresholds.json` rather than assuming it still held: the list
is still `tests/**`, `samples/**`, `obj`, `bin`, `*.g.cs`, with
**`tools/**` absent** — so the warning that anything under `tools/` is
measured like product code, and that an assembly no test project
references contributes changed lines counted as *uncovered*, is still
accurate and worth keeping.
- `master`'s "reproduce a coverage failure locally" line supersedes this
branch's near-identical one, so only `master`'s survives.

Post-merge: `dotnet build UA.slnx -t:Rebuild` **0 errors**, 2
pre-existing `CA1861`; Robotics **467** net10.0 / **447** net48; Robot
Intent **20** on both.

### Getting CI green

The pipeline had never actually run on this branch until now (it was
waiting on the fork-PR approval gate), so the first run surfaced four
real problems, each fixed at source:

- **Seven build legs failed** because `IntentEnabledRobot` pins
`net10.0` for the OpenUSD payload but never opted into
`RestrictForLegacyTfm`. On the legacy legs the libraries build as
net472/net48, where `Opc.Ua.Types` exposes the `System.Threading.Lock`
polyfill publicly, and that collides with the sample's own net10.0 BCL
(`CS0433`). `Opc.Ua.OpenUsd.Connector.Viewer` was already using the
opt-out for the same reason.
- **A Linux-only test failure** turned out to be a real defect, not a
platform quirk: `SetPose` published the *commanded* interpolated pose
beside joint frames derived from the *solved* joints, so the two
disagreed by the inverse-kinematics residual — about 8 mm, constant
after any real motion. That is the lying-digital-twin defect one level
deeper than the per-step IK fix reached. `SetPose` now derives both from
the joint angles.
- **Three source-generator tests** asserted the old emitted shape. The
clause 6.2 Null-Variant fix was implemented in
`ObjectTypeProxyGenerator` so every generated proxy benefits, which
changed that shape; the tests are updated and strengthened to pin the
`IsNull` branch as well.
- **A CI-only timeout** in the simulated arm drain: the executor runs on
a manual clock so the tests do not depend on machine speed, but the
drain guarded itself with a wall-clock deadline, which put that
dependence back. CI runs with coverage instrumentation, which is enough
to take a per-step IK probe from ~0.6 s to over 5 s. The guard is now a
simulated step budget.

One failure was **not** from this PR and did not recur: a Roslyn
`AccessViolationException` compiling `Opc.Ua.ISA95` on one leg, while
the Debug leg of the same target passed on identical code and the
Release build succeeds locally.

## Related Issues

- Relates to #3827 — the request that prompted the robotics intent work.
- Builds on #4127.

The companion specification is drafted in the open at
[marcschier/opcua-drafts#47](https://github.com/marcschier/opcua-drafts/pull/47)
(`metaverse-specs/robot-intent/`), with the prior art and the reasoning
behind each decision in the research document beside it. **Nothing in it
is normative or endorsed by the OPC Foundation, and its NodeIds and
namespace URI are provisional** — which is the main reason this is a
draft.

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [x] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

On the test checkbox, precisely: the whole `UA.slnx` suite now runs on
net10.0 with **50 of 52 assemblies fully green**, and
`Opc.Ua.Robotics.Tests` passes on **all five** target frameworks
including net472, net8.0 and net9.0 which had never previously been
exercised. The two remaining failures are reproduced identically at the
merge-base and are detailed above, so I have ticked the box; if you
would rather it stayed unticked until those two are green, say so and I
will revert it.

## Points I would most like feedback on

1. **The namespace and NodeIds are provisional.** They come from a draft
specification, not from the OPC Foundation. If this lands before the
model is registered, the identifiers will move.
2. **The model lives in `Opc.Ua.Robotics`.** It is standalone on the
base UA namespace and takes no dependency on OPC 40010, so a separate
`Opc.Ua.RobotIntent` package would arguably be cleaner. Keeping it here
was a deliberate call — this is where the robot-facing API already is —
but it is the easiest thing to change now and the hardest later.
3. **Removing the convention API from #4127 is a breaking change** for
anyone who adopted it. It was explicitly marked non-normative, so I have
assumed that is acceptable — please say if a deprecation period is
wanted instead.
4. **Serial execution** is a deliberate simplification. Concurrent
`None`/`Soft` intents would be an optimisation, not a correction, but it
is worth agreeing that reading.
5. **`samples/Robotics/` reorganisation** moves `MinimalRobotServer`.
Happy to split that into its own commit if it makes review easier.

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 1dab1302-19c5-4a9b-a50c-d97d389713aa
Copilot-Session: a248a589-9a20-4372-868e-5d347e57001b
2026-08-08 09:08:40 +02:00
Marc SchierandCopilot ae241b6625 Robotics: the OPC 40010 companion SDK, its client and the robot sample (#4127)
**Stack 5/5** — base #4126. Part of the #4096 split; see #4096 for the
overall picture. Closes the API work for #3827.

> Review after #4123, #4124, #4125 and #4126. This branch is
content-identical to the original #4096 branch, so merging the stack
lands exactly what #4096 contained.

## The problem this solves

OPC 40010 1.02 defines a rich robot **topology** but **no motion verbs
at all** — its actuation surface is the SystemOperation and TaskControl
state machines plus a Controller `Programs` directory. Meanwhile
[URML](https://github.com/URML-MARS/URML) names OPC UA Robotics as its
canonical non-ROS substrate and asks for `MoveTo` / `Grasp` / `Release`
methods the companion spec does not define, so today it needs a
hand-maintained per-deployment NodeId mapping file.

This closes that gap in two clearly separated tiers, and never presents
the second as standard.

## Contents

**Server** — stock `RoboticsNodeManager`, ordered
`IRoboticsModelProvider` composition, `IRoboticsConfigurator`
code-behind, and validated fluent topology builders for systems,
controllers, motion devices, axes, power trains, motors, gears, drives,
safety states, software, task controls and task modules, with the
correct OPC 40010 semantic references.

**Standard operations** — `AddSystemOperation` and
`AddTaskControlOperation` drive the Part 16 state machines. An illegal
cause is rejected with `BadInvalidState` before the handler runs; a
handler returning a bad `ServiceResult` does not move the machine; and a
transition already in flight rejects a concurrent one rather than
letting both commit.

**Programs** — binds the optional `FileDirectoryType` through the
reusable `IFileDirectoryBinder` added in 1/5.

**Operation conventions** — opt-in and explicitly non-normative `MoveTo`
/ `MoveJ` / `MoveL` / `Grasp` / `Release` / `PickFrom` / `PlaceAt` /
`SwapTool` / `SetOutput` / `CallProgram`, created **only** in an
application-owned namespace — the OPC UA, DI, IA and Robotics namespaces
are rejected — plus a generic `AddOperation<TRequest, TResponse>`
extension point.

**Client** — `RoboticsClient` extends the DI client, is subtype aware
throughout, and provides typed topology snapshots, the standard
operation and task-control clients, `ProgramsAsync`, streaming
observation and a DI factory. Verbs resolve by BrowseName, so no NodeId
mapping file is needed.

**Sample** — `MinimalRobotServer` composes five models (Robotics, IA,
DI, OpenUSD, RSL/GPOS) purely through `IRoboticsModelProvider`
contributions, which is the real proof that the stock hosting is
sufficient. It follows the published KUKA KR 16-2 kinematics and axis
limits with an eased pick-and-place cycle.

Also restores the vendor-subtype scanner test held back from 2/5, which
uses the Robotics NodeSet as its fixture.

## Defects found and fixed along the way

- **`ControllerType.CurrentUser`** is Mandatory in OPC 40010 but was
neither built nor validated. Now has a builder and a validation error.
- **`MotionDeviceType.TaskControlReference`** was absent because it must
target a `TaskControlOperationType` instance that did not exist. Now
wired.

## Validation

`dotnet build UA.slnx` — 0 errors, 0 warnings.

| Suite | Result |
| --- | --- |
| Opc.Ua.Robotics.Tests | 103 / 0 |
| Opc.Ua.OpenUsd.Tests | 635 / 0 |
| Opc.Ua.Di.Tests | 342 / 0 |
| Opc.Ua.SourceGeneration.Tests | 94 / 0 |
| Opc.Ua.Aot.Tests (NativeAOT) | 120 / 0 |

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 8cbb8cd0-f0cb-4ab0-bea2-6202fbf69485
2026-08-01 07:55:58 +02:00
Marc Schier 275c3800b5 [Server] Add live NodeManager lifecycle support (#4094)
# Description

Adds supported live add, reload, and remove lifecycle operations for
NodeManager instances on a running server.

The change introduces a DI-backed `INodeManagerLifecycle` service with
direct `StandardServer` access, generation-aware registration handles,
copy-on-write routing, transactional prepare/commit/rollback, runtime
NodeSet convenience APIs, append-only namespace updates, model and
semantic change notifications, additive-compatible complex type priming,
and complete teardown behavior.

Lifecycle publication is coordinated with requests, sessions,
subscriptions, monitored items, continuation points, and shutdown so
retired managers cannot remain reachable or be disposed while still in
use. Compatible monitored items transfer to replacement generations
without a transient bad status. Removed or incompatible Nodes publish
`BadNodeIdUnknown` as required by OPC UA Part 4 section 5.8.4.1, retain
their MonitoredItem identity, and automatically recover when a
compatible Node with the same NodeId returns.

Registration is documented end to end in the new
[docs/NodeManagerRegistration.md](docs/NodeManagerRegistration.md),
which covers compile-time, startup, and runtime registration together
with the guarantees for MonitoredItems, Browse continuation points,
namespace indexes, DataTypes, and change notifications.
## Review feedback addressed

Interface surface reduced, as requested:

- `INodeManagerMonitoredItemTracker` folded into
`ISubscriptionMonitoredItemLifecycle`.
- `INodeManagerMutationCoordinator` and the asynchronous MonitoredItem
recovery entry point folded into `IDynamicNodeManagerHost`.
- `ISessionClosingRegistry` folded into `IServerInternal`, then replaced
by `ISession.IsClosing`.
- `ISubscriptionDeletionRegistry` folded into `ISubscriptionManager`,
then removed entirely.
- `INodeManagerContinuationPointTracker` folded into `ISession`.
- The synchronous recovery entry point kept on its own
`ISyncNodeManagerMonitoredItemRecovery`, because `AddPredefinedNode`
cannot await; it still routes through the asynchronous
`INodeManagerMonitoredItemLifecycle` that `AsyncNodeManagerAdapter`
exposes.
- `IMonitoredItemLifecycle` renamed to `IDetachableMonitoredItem`.

Reach into the Subscription area reduced to the minimum the feature
needs:

- The lifecycle feature itself leaves `SubscriptionManager` almost
untouched: two guards that reject a request from a Session that is
closing, on `CreateSubscription` and on `TransferSubscriptions`, because
it would create state that is about to be torn down. The deletion claim
registry, the session closing gates, the closed-session bookkeeping and
the deletion restore paths introduced by earlier revisions are gone.
Transferring a subscription away from a session that is closing stays
allowed, since that is the recovery path the service exists for; the
race that exposed is fixed by serialising source-queue closure with the
transfer rather than by rejecting it.
- Queueing is disabled again for a MonitoredItem with `QueueSize <= 1`,
as before this PR. Without a queue the Client is served the last sampled
value, so the missing-Node notification simply becomes that value;
losing values is expected for a MonitoredItem without queuing.
- What remains of the notification is one `DataValue` plus one bool in
`DataChangeQueueHandler`, mirroring the existing overflow pair, which
stops it being the value discarded when a configured queue is full.
- `MonitoredItem` keeps its original publish path, its original queue
creation and restore paths, its original triggering behaviour, and no
per-epoch bookkeeping.
- `IStoredMonitoredItem` carries `IsDeleted` and `IsDetached`, so a
restored item reports the state it was stored with rather than one
inferred from the last value's StatusCode.

Other feedback:

- Documented `HostedNodeManagerLifecycle`, `IDynamicNodeManagerHost`,
`NodeManagerRoutingTable`, and the `RequestManager` validation and
request scopes.
- Renamed `ValidateMonitoredItemAsync` to `CanAttachMonitoredItemAsync`
and `RestoreMonitoredItemAsync` to `RecoverMonitoredItemAsync`, so the
lifecycle API no longer collides with the durable Subscription
`RestoreMonitoredItem` path used at server startup.
- Removed the `CustomNodeManager2` dependency from the synchronous
MonitoredItem recovery path.
- `DataChangeQueueHandler` is back to the two constructors 1.5.378
shipped, each taking an optional `TimeProvider`.
- Session closing is a one-way latch, and the Session is removed even
when teardown throws.
- Documented what a custom NodeManager has to implement to take part in
live lifecycle operations, and which NodeManager implements
`INodeManagerReloadParticipant` today.

## Fixes found during review

- The guard that stops a NodeManager lifecycle operation being started
from inside a service handler never fired. It was backed by an
`AsyncLocal` written inside `async ValidateRequestAsync`, which is
invisible to the caller that awaited it, so a lifecycle call from a
NodeManager callback waited for its own request and held the lifecycle
semaphore forever. The mark is now applied by the service dispatcher,
and the drain is bounded so no path can wedge the lifecycle permanently.
- `ValidateRequestAsync` is no longer virtual. An override that rejected
a request after calling `base` left it registered forever; subclasses
now use `OnRequestValidatedAsync`, whose failures complete the request.
- A MonitoredItem deleted and disposed while a reload was handing it to
the replacement NodeManager could be attached anyway. The item now
reserves itself for the hand-over and the transition takes it back if it
was disposed meanwhile.
- The Overflow bit is recorded and applied when the value is published,
as the surrounding design does, rather than written into the value at
enqueue time.
- MonitoredItem cleanup for a Subscription being deleted no longer
passes null entries to `DeleteMonitoredItemsAsync`.
- Browse continuation points of a retired NodeManager are persisted and
disposed outside the Session lock.

## Open review discussions

Three threads are open, replied to and awaiting reviewer decisions:
separating service-call dispatch from NodeManager handling in
`MasterNodeManager` (tracked as #4098), the request-scoping shape in
`StandardServer`, and how much of the async MonitoredItem service
implementation should stay in `Subscription`.

Issue #4102 records a specification ambiguity found while implementing
the missing-Node notification: Part 4 §5.8.4.1 makes it mandatory, but
the protected over-capacity queue entry §5.13.1.5 defines applies to
`EventQueueOverflowEventType` only, so the specification does not say
how it survives a full queue.

## Validation

- Full `Opc.Ua.Server.Tests` on net10.0: 3,768 passed, 5 skipped.
- Lifecycle, MonitoredItem, Subscription and continuation point suites:
185 passed on net10.0 and 75 on net48.
- Server builds complete with zero warnings or errors.
- Two failures are pre-existing and unrelated:
`DurableDataValueQueueVerifyReferenceBatchingAsync` (flaky
`BatchPersistor` file contention, passes in isolation on net10.0 and
net48) and
`ConfigureApplicationBuildsSharedClientAndServerConfigurationAsync`
(fails on a clean tree with these changes stashed).

## Related Issues

- Fixes #3993
- Follow-up tracked in #4098
2026-07-28 16:06:28 +02:00
Marc Schier 5b9bcedc62 Add OPC UA ISA-95 Common Model and Job Control support (#4089)
# Description

Adds first-class support for the OPC UA ISA-95 companion specifications:

- OPC-10030 Common Model.
- OPC-10031-4 Job Control V1.
- OPC-10031-4 Job Control V2.

The change introduces `Opc.Ua.ISA95`, `Opc.Ua.ISA95.Client`, and
`Opc.Ua.ISA95.Server`, together with a NativeAOT-compatible minimal
server sample and comprehensive tests.

## Highlights

- Compiles the three canonical NodeSets and identifier mapping CSV files
through the source generator.
- Adds NodeSet identifier mapping validation, typed method
arguments/results, companion event records, and generated method
argument nodes.
- Provides typed Common Model builders with normative relationships and
an injectable `GeoSpatialLocationType` provider.
- Implements lossless V1/V2 Job Control providers over a shared
version-neutral store, including state paths, status events, comments,
response queries, catalog changes, and cohesive DI registration.
- Adds subtype-aware typed clients, standalone encodeable registration,
`IIsa95ClientFactory`, and V2 status-event streaming.
- Adds the `MinimalIsa95Server` sample, package documentation, and an
ISA-95 guide with conformance and HA guidance.
- Tracks typed RSL/GPOS integration as follow-up issue #4095.

## Validation

- `Opc.Ua.ISA95.Tests`: 137/137 passed on `net10.0` and `net48`.
- Source-generator suites: 81/81 model, 90/90 stack, 3718 passed / 8
skipped core.
- `EventRecordFieldReaders` feedback tests: 6/6 on `net10.0` and
`net48`.
- `EventRecordFieldReaders` changed-method patch coverage: 100% line
coverage (36/36) and 100% branch coverage (22/22).
- `Opc.Ua.ISA95`, `.Client`, and `.Server` build across all configured
target frameworks without new diagnostics.
- Cobertura line coverage: 88.08% model, 90.04% client, 91.19% server.
- NativeAOT sample publishes and passes a live typed V2
Store/status-event validation.
- The ISA-95 NativeAOT smoke test passes in the source-generated native
test executable.
- OPC UA KB NodeSet validation reports zero errors for Common, V1, and
V2.

The broader NativeAOT executable still reports unrelated existing GDS
and complex-type test failures; the ISA-95-specific native test passes.

## Node state generator fixes

Generating method arguments inline for imported nodesets regressed every
model that already emits `InputArguments` / `OutputArguments` child node
factories:

- The inline block ran before the child factories.
`MethodState.CreateOrReplaceInputArguments` keeps the property that was
assigned first, so the child carrying the well-known NodeId was dropped
and a NodeId-less placeholder remained in the address space. This broke
browsing (reference descriptions without a target) and made method
arguments unreachable at their well-known NodeIds.
- The `MethodDeclarationId` fallback keyed on an autogenerated display
name redirected every declared method of the standard address space to
its own NodeId, which made method calls fail.

The inline block is now emitted after the child factories and reduced to
a value assignment when a child factory exists. The value is only
re-emitted when an argument references a namespace other than OPC UA,
because the value of an imported property is the verbatim XML of the
source nodeset whose namespace indices do not survive the import. The
`MethodDeclarationId` fallback is restricted to declarations without a
resolvable NodeId. The generated OPC UA address space is byte-identical
to `master` again.

## Related Issues

- Fixes #4088
- Follow-up: #4095
2026-07-28 12:01:57 +02:00
Copilot a03bca97cb Remove TraceConfiguration and related APIs (#4092)
# Description

This change removes the remaining `TraceConfiguration`-driven
apply/setter API path and aligns configuration startup with the 2.0
telemetry model (`ITelemetryContext`/`ILoggerFactory`). It also updates
migration docs to make the removal explicit and actionable.

- **Core API removals**
  - Deleted `TraceConfiguration.ApplySettings()` implementation file.
  - Removed runtime apply calls from configuration/server startup paths.
  - Removed fluent builder trace setters:
    - `SetOutputFilePath(...)`
    - `SetDeleteOnLoad(...)`
    - `SetTraceMasks(...)`
  - Simplified builder interface inheritance accordingly.

- **Call-site and test fixture updates**
- Removed usage of deleted trace fluent APIs in affected test
infrastructure and fixtures.
- Updated GDS log readers to tolerate missing `TraceConfiguration`
output path safely.

- **Migration guidance**
- Updated migration docs to explicitly state removal of
`TraceConfiguration` apply APIs and direct users to telemetry-based
logging configuration.

```csharp
// Removed API pattern
app.Build(uri, product)
   .AsClient()
   .SetOutputFilePath("trace.log")
   .SetTraceMasks(Utils.TraceMasks.Error);

// New direction
// Configure logging via ITelemetryContext / ILoggerFactory at composition/startup.
```

## Related Issues

- OPCFoundation/UA-.NETStandard#4091

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [ ] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [ ] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

<!-- START COPILOT CODING AGENT SUFFIX -->

- Fixes #4091

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
2026-07-26 00:50:59 +02:00
Marc Schier 2a4bc0fe24 Make reverse connect lifecycle fully asynchronous (#4059)
## Summary

- add cancellation-aware asynchronous start, lazy initialization, stop,
reload, and disposal for `ReverseConnectManager`
- make listener replacement transactional with explicit ownership,
rollback/restoration, stale watcher protection, and deterministic
concurrent start/stop/dispose behavior
- add injectable async configuration providers, remove the former
protected configuration hooks, and retain obsolete synchronous lifecycle
compatibility wrappers
- integrate eager Generic Host startup plus non-host lazy startup,
including custom application-configuration providers
- serialize `ReverseConnectHost` lifecycle and extend raw TCP, Kestrel
TCP, WSS, hosting, concurrency, rollback, and NativeAOT coverage
- document the async lifecycle, hosting behavior, cancellation
guarantees, provider model, and migration path

## Validation

- `Opc.Ua.Client` Release build across all supported target frameworks
- reverse-connect client and core tests on net10.0 and net48
- raw TCP, Kestrel TCP, and WSS integration tests on net10.0; raw TCP on
net48
- NativeAOT publish and 115-test executable run

Closes #4013.

Related: #3985, #4009.
2026-07-23 10:40:32 +02:00
Marc Schier 3490d9cd05 Use Dekaf by default for Kafka on all target frameworks (#4038)
# Description

Upgrade the Kafka transport from Dekaf 1.2.0 to 1.7.0 and use the
pure-managed Dekaf adapter by default on every supported target
framework.

- Enable the Dekaf adapter and its guard tests on `net472`, `net48`,
`netstandard2.1`, `net8.0`, `net9.0`, and `net10.0`.
- Retain the `Confluent.Kafka` adapter and factory as an opt-in DI
backend through `WithConfluentKafkaClient()`.
- Update the central dependency pins required by Dekaf 1.7.0.
- Validate NativeAOT/trimming compatibility on `net10.0` for the default
Dekaf backend; the opt-in Confluent backend remains JIT-only.
- Avoid per-header allocation on .NET Framework when Dekaf header memory
is array-backed.

Validation:

- Release builds passed with zero warnings for all six library target
frameworks.
- Kafka adapter and DI selection tests passed on `net48` and `net10.0`.
- `dotnet publish tests\Opc.Ua.Aot.Tests\Opc.Ua.Aot.Tests.csproj -c
Release -r win-x64 --self-contained true`
- The generated NuGet package includes Dekaf 1.7.0 and Confluent.Kafka
2.15.0 for every target framework.

## Related Issues

None.

## Checklist

- [ ] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [x] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [x] I have addressed **all** PR feedback received.
2026-07-23 10:18:11 +02:00
Marc Schier 8538f531e7 Update paths for the consolidated repository layout 2026-07-16 06:26:05 +02:00
Marc Schier 7cec2d614d Move repository files to the consolidated layout 2026-07-16 06:25:54 +02:00