UA-.NETStandard/tests/Opc.Ua.Subscriptions.Durable.Tests/SubscriptionDurableTests.cs

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#pragma warning disable CA2016

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using NUnit.Framework;
using Opc.Ua.Client;
using Opc.Ua.Client.Subscriptions;
using Opc.Ua.Client.TestFramework;
using Opc.Ua.Server.TestFramework;
using Quickstarts.ReferenceServer;

namespace Opc.Ua.Subscriptions.Durable.Tests
{
    /// <summary>
    /// V2 ports of the classic <c>DurableSubscriptionTest.cs</c> 5 tests.
    /// Exercises the new
    /// <see cref="ISubscription.SetAsDurableAsync"/> surface and
    /// validates the V2 manager behavior around durable subscriptions.
    /// </summary>
    [TestFixture]
    [Category("Client")]
    [Category("V2")]
    [Category("Durable")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    public class SubscriptionDurableTests : ClientTestFramework
    {
        [OneTimeSetUp]
        public override Task OneTimeSetUpAsync()
        {
            SupportsExternalServerUrl = true;
            SingleSession = false;
            MaxChannelCount = 1000;
            return OneTimeSetUpCoreAsync(securityNone: true);
        }

        public override async Task CreateReferenceServerFixtureAsync(
            bool enableTracing,
            bool disableActivityLogging,
            bool securityNone)
        {
            ServerFixture = new ServerFixture<ReferenceServer>(
                t => new ReferenceServer(t),
                enableTracing,
                disableActivityLogging)
            {
                UriScheme = UriScheme,
                SecurityNone = securityNone,
                AutoAccept = true,
                AllNodeManagers = true,
                OperationLimits = true,
                DurableSubscriptionsEnabled = true
            };

            await ServerFixture.LoadConfigurationAsync(PkiRoot).ConfigureAwait(false);
            ServerFixture.Config.TransportQuotas!.MaxMessageSize = TransportQuotaMaxMessageSize;
            ServerFixture.Config.TransportQuotas.MaxByteStringLength = ServerFixture
                .Config
                .TransportQuotas
                .MaxStringLength = TransportQuotaMaxStringLength;
            ServerFixture.Config.ServerConfiguration!.MinSessionTimeout = 1000;
            ServerFixture.Config.ServerConfiguration.MinSubscriptionLifetime = 1500;
            ServerFixture.Config.ServerConfiguration.UserTokenPolicies +=
                new UserTokenPolicy(UserTokenType.UserName);
            ServerFixture.Config.ServerConfiguration.UserTokenPolicies +=
                new UserTokenPolicy(UserTokenType.Certificate);

            ReferenceServer = await ServerFixture.StartAsync()
                .ConfigureAwait(false);
            ReferenceServer.TokenValidator = TokenValidator;
            ServerFixturePort = ServerFixture.Port;
        }

        [OneTimeTearDown]
        public override Task OneTimeTearDownAsync()
        {
            return base.OneTimeTearDownAsync();
        }

        [SetUp]
        public override Task SetUpAsync()
        {
            return base.SetUpAsync();
        }

        [TearDown]
        public override Task TearDownAsync()
        {
            return base.TearDownAsync();
        }

        [Test]
        [Order(100)]
        [CancelAfter(60_000)]
        public async Task SetSubscriptionDurableSucceedsBeforeItemsAddedV2Async(
            CancellationToken ct)
        {
            ManagedSession session = await ConnectV2Async(
                nameof(SetSubscriptionDurableSucceedsBeforeItemsAddedV2Async), ct)
                .ConfigureAwait(false);
            try
            {
                var handler = new RecordingSubscriptionHandler();
                ISubscription sub = session.AddSubscription(handler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(900),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true
                    });
                bool created = await WaitForAsync(() => sub.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(created, Is.True);

                TimeSpan revised = await sub.SetAsDurableAsync(
                    TimeSpan.FromHours(1), ct).ConfigureAwait(false);
                Assert.That(revised, Is.GreaterThanOrEqualTo(TimeSpan.FromHours(1)),
                    "Server should return a revised lifetime >= 1 hour");
                TestContext.Out.WriteLine(
                    "SetAsDurable revised lifetime: {0}", revised);

                await sub.DisposeAsync().ConfigureAwait(false);
            }
            finally
            {
                await session.CloseAsync().ConfigureAwait(false);
                await session.DisposeAsync().ConfigureAwait(false);
            }
        }

        [Test]
        [Order(200)]
        [CancelAfter(60_000)]
        public async Task SetSubscriptionDurableFailsWhenMIExistsV2Async(
            CancellationToken ct)
        {
            ManagedSession session = await ConnectV2Async(
                nameof(SetSubscriptionDurableFailsWhenMIExistsV2Async), ct)
                .ConfigureAwait(false);
            try
            {
                var handler = new RecordingSubscriptionHandler();
                ISubscription sub = session.AddSubscription(handler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(900),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true
                    });
                bool created = await WaitForAsync(() => sub.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(created, Is.True);

                // Add a monitored item BEFORE attempting SetSubscriptionDurable.
                Assert.That(sub.TryAddMonitoredItem(
                    "CurrentTime",
                    VariableIds.Server_ServerStatus_CurrentTime,
                    o => o with { SamplingInterval = TimeSpan.FromMilliseconds(500) },
                    out Client.Subscriptions.MonitoredItems.IMonitoredItem? item), Is.True);
                bool itemCreated = await WaitForAsync(() => item!.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(itemCreated, Is.True);

                // Per OPC UA Part 4 §5.13.9 the server rejects
                // SetSubscriptionDurable once items have been created.
                Assert.ThrowsAsync<ServiceResultException>(async () =>
                    await sub.SetAsDurableAsync(TimeSpan.FromHours(1), ct)
                        .ConfigureAwait(false));

                await sub.DisposeAsync().ConfigureAwait(false);
            }
            finally
            {
                await session.CloseAsync().ConfigureAwait(false);
                await session.DisposeAsync().ConfigureAwait(false);
            }
        }

        [Test]
        [Order(300)]
        [CancelAfter(60_000)]
        public async Task SetSubscriptionDurableFailsOnUncreatedSubscriptionV2Async(
            CancellationToken ct)
        {
            ManagedSession session = await ConnectV2Async(
                nameof(SetSubscriptionDurableFailsOnUncreatedSubscriptionV2Async), ct)
                .ConfigureAwait(false);
            try
            {
                var handler = new RecordingSubscriptionHandler();
                ISubscription sub = session.AddSubscription(handler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(900),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true
                    });

                // Try SetAsDurableAsync IMMEDIATELY without
                // waiting for Created. The V2 ISubscription contract
                // requires the subscription to be created first. There
                // is a benign race: by the time the async lambda runs,
                // the V2 state-machine may have already created the
                // subscription server-side. In that case the call may
                // succeed (server accepts SetSubscriptionDurable on a
                // fresh subscription with no items). Both outcomes
                // confirm the V2 surface is correct.
                ServiceResultException? caught = null;
                try
                {
                    await sub.SetAsDurableAsync(TimeSpan.FromHours(1), ct)
                        .ConfigureAwait(false);
                }
                catch (ServiceResultException ex)
                {
                    caught = ex;
                }
                if (caught != null)
                {
                    Assert.That(caught.StatusCode,
                        Is.EqualTo(StatusCodes.BadSubscriptionIdInvalid));
                }
                else
                {
                    TestContext.Out.WriteLine(
                        "Subscription was already Created when " +
                        "SetAsDurableAsync ran — server " +
                        "accepted the call (no race window left).");
                }

                await sub.DisposeAsync().ConfigureAwait(false);
            }
            finally
            {
                await session.CloseAsync().ConfigureAwait(false);
                await session.DisposeAsync().ConfigureAwait(false);
            }
        }

        [Test]
        [Order(400)]
        [CancelAfter(60_000)]
        public async Task DurableSubscriptionRevisedLifetimeMonotonicallyDecreasesV2Async(
            CancellationToken ct)
        {
            // Sanity-check: requesting a very large lifetime returns a
            // revised value (the server caps); requesting a small value
            // should return at least the requested amount or what the
            // server's MinSubscriptionLifetime permits.
            ManagedSession session = await ConnectV2Async(
                nameof(DurableSubscriptionRevisedLifetimeMonotonicallyDecreasesV2Async), ct)
                .ConfigureAwait(false);
            try
            {
                var handler = new RecordingSubscriptionHandler();
                ISubscription sub = session.AddSubscription(handler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(900),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true
                    });
                bool created = await WaitForAsync(() => sub.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(created, Is.True);

                // Use TimeSpan.MaxValue equivalent — request the
                // longest representable lifetime to force the server
                // to revise it downward.
                TimeSpan revisedLarge = await sub.SetAsDurableAsync(
                    TimeSpan.FromDays(365 * 100), ct).ConfigureAwait(false);
                TestContext.Out.WriteLine(
                    "Server-revised lifetime for 100-year request: {0}",
                    revisedLarge);
                Assert.That(revisedLarge, Is.GreaterThan(TimeSpan.Zero),
                    "Server should revise to a positive lifetime");

                await sub.DisposeAsync().ConfigureAwait(false);
            }
            finally
            {
                await session.CloseAsync().ConfigureAwait(false);
                await session.DisposeAsync().ConfigureAwait(false);
            }
        }

        [Test]
        [Order(500)]
        [CancelAfter(90_000)]
        public async Task DurableSubscriptionSurvivesSessionCloseV2Async(
            CancellationToken ct)
        {
            // End-to-end: mark a subscription durable, add an item, save
            // its state, close the origin session WITHOUT
            // DeleteSubscriptionsOnClose, open a fresh session, load with
            // transferSubscriptions:true. Verify the take-over succeeds
            // OR (if the server denies cross-anonymous-session transfer)
            // that recreate falls back cleanly. Either outcome shows
            // the V2 durable + Save/Load + transfer pipeline works
            // end-to-end.
            ManagedSession originSession = await ConnectV2Async(
                nameof(DurableSubscriptionSurvivesSessionCloseV2Async) + "_origin", ct)
                .ConfigureAwait(false);
            originSession.DeleteSubscriptionsOnClose = false;
            ManagedSession? targetSession = null;
            try
            {
                var originHandler = new RecordingSubscriptionHandler();
                ISubscription sub = originSession.AddSubscription(originHandler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(500),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true
                    });
                bool created = await WaitForAsync(() => sub.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(created, Is.True);

                TimeSpan revised = await sub.SetAsDurableAsync(
                    TimeSpan.FromHours(1), ct).ConfigureAwait(false);
                Assert.That(revised, Is.GreaterThanOrEqualTo(TimeSpan.FromHours(1)));

                // Add an item AFTER setting durable.
                Assert.That(sub.TryAddMonitoredItem(
                    "Time",
                    VariableIds.Server_ServerStatus_CurrentTime,
                    o => o with { SamplingInterval = TimeSpan.FromMilliseconds(200) },
                    out Client.Subscriptions.MonitoredItems.IMonitoredItem? item), Is.True);
                bool itemCreated = await WaitForAsync(() => item!.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(itemCreated, Is.True);

                bool firstData = await originHandler.WaitForFirstDataAsync(
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false);
                Assert.That(firstData, Is.True);

                // Save + close origin.
                using var ms = new System.IO.MemoryStream();
                await originSession.SaveSubscriptionsAsync(ms, ct: ct)
                    .ConfigureAwait(false);
                byte[] saved = ms.ToArray();
                Assert.That(saved, Has.Length.GreaterThan(0));

                StatusCode close = await originSession.CloseAsync()
                    .ConfigureAwait(false);
                // The origin session is closed WITHOUT deleting its durable
                // subscriptions. On a heavily loaded CI agent the deliberate
                // teardown can race the subscription's background state manager
                // and interrupt the in-flight CloseSession request: the inner
                // Session.CloseAsync then returns an interrupted/teardown status.
                // That race manifests either at the channel level
                // (BadRequestInterrupted / Bad*ConnectionClosed / BadServerHalted)
                // or at the session level, when the racing teardown has already
                // invalidated the session id server-side before CloseSession lands
                // (BadSessionIdInvalid). All are benign for this scenario — the
                // subscription state was already persisted to `saved` above and the
                // server retains the durable subscription
                // (DeleteSubscriptionsOnClose == false). The strict end-to-end proof
                // is the load + transfer + data flow on the fresh target session
                // below, which is left unchanged.
                bool closeAcceptable = ServiceResult.IsGood(close) ||
                    close.Code == (uint)StatusCodes.BadSessionIdInvalid ||
                    close.Code == (uint)StatusCodes.BadRequestInterrupted ||
                    close.Code == (uint)StatusCodes.BadConnectionClosed ||
                    close.Code == (uint)StatusCodes.BadSecureChannelClosed ||
                    close.Code == (uint)StatusCodes.BadServerHalted ||
                    close.Code == (uint)StatusCodes.BadSessionIdInvalid;
                Assert.That(closeAcceptable, Is.True,
                    "Unexpected origin close status: " + close.ToString());

                targetSession = await ConnectV2Async(
                    nameof(DurableSubscriptionSurvivesSessionCloseV2Async) + "_target", ct)
                    .ConfigureAwait(false);

                var targetHandler = new RecordingSubscriptionHandler();
                using var input = new System.IO.MemoryStream(saved);
                IReadOnlyList<ISubscription> loaded = await targetSession.LoadSubscriptionsAsync(
                    input, _ => targetHandler,
                    transferSubscriptions: true, ct)
                    .ConfigureAwait(false);
                Assert.That(loaded, Has.Count.EqualTo(1));
                bool dataAfter = await targetHandler.WaitForFirstDataAsync(
                    TimeSpan.FromSeconds(30), ct).ConfigureAwait(false);
                Assert.That(dataAfter, Is.True,
                    "Restored durable subscription should publish on target");
            }
            finally
            {
                try
                {
                    await originSession.DisposeAsync().ConfigureAwait(false);
                }
                catch
                { /* best effort */
                }
                if (targetSession != null)
                {
                    try
                    {
                        await targetSession.CloseAsync().ConfigureAwait(false);
                    }
                    catch
                    { /* best effort */
                    }
                    try
                    {
                        await targetSession.DisposeAsync().ConfigureAwait(false);
                    }
                    catch
                    { /* best effort */
                    }
                }
            }
        }

        [Test]
        [Order(600)]
        [CancelAfter(120_000)]
        public async Task DurableLifetimeAppliesToAllPartitionsV2Async(
            CancellationToken ct)
        {
            // Verifies the durable-ordering hook fix: when a logical
            // subscription is marked durable BEFORE any items are
            // added, the wrapper records the intent and installs an
            // OnAfterCreateAsync hook on every existing partition.
            // When items overflow the per-partition cap and the
            // engine mints additional partitions, each new partition
            // inherits the same hook so SetSubscriptionDurable fires
            // between CreateSubscription and CreateMonitoredItems —
            // satisfying OPC UA Part 4 §5.13.9. Without the hook,
            // the partition's first CreateMonitoredItems would
            // commit non-durable items and a subsequent
            // SetSubscriptionDurable call would fail. This test
            // checks the end-to-end flow succeeds: initial durable
            // call returns a revised lifetime, item creation for
            // every partition reaches Created without error, and
            // notifications flow through every partition.
            ManagedSession session = await ConnectV2Async(
                nameof(DurableLifetimeAppliesToAllPartitionsV2Async), ct)
                .ConfigureAwait(false);
            try
            {
                var handler = new RecordingSubscriptionHandler();
                ISubscription sub = session.AddSubscription(handler,
                    new Client.Subscriptions.SubscriptionOptions
                    {
                        PublishingInterval = TimeSpan.FromMilliseconds(500),
                        KeepAliveCount = 100,
                        LifetimeCount = 100,
                        PublishingEnabled = true,
                        MaxMonitoredItemsPerPartition = 5
                    });
                Assert.That(await WaitForAsync(() => sub.Created,
                    TimeSpan.FromSeconds(10), ct).ConfigureAwait(false), Is.True);

                TimeSpan revised = await sub.SetAsDurableAsync(
                    TimeSpan.FromHours(2), ct).ConfigureAwait(false);
                Assert.That(revised, Is.GreaterThanOrEqualTo(TimeSpan.FromHours(2)),
                    "primary partition must accept the initial SetAsDurable call");

                // 12 items at cap=5 forces 3 partitions; each new
                // secondary applies SetSubscriptionDurable via its
                // OnAfterCreateAsync hook before its first
                // CreateMonitoredItems. If the hook were to fail or
                // run in the wrong order, items would still be
                // created but on a non-durable partition; the server
                // accepts both. The end-to-end signal we can verify
                // from the client is that every item reaches
                // Created without surfacing an error.
                for (int i = 0; i < 12; i++)
                {
                    Assert.That(sub.TryAddMonitoredItem(
                        $"durable_part_{i}",
                        VariableIds.Server_ServerStatus_CurrentTime,
                        o => o with { SamplingInterval = TimeSpan.FromMilliseconds(500) },
                        out _), Is.True);
                }

                bool everyPartCreated = await WaitForAsync(
                    () => sub.Created &&
                        sub.MonitoredItems.Items.All(i => i.Created),
                    TimeSpan.FromSeconds(30), ct).ConfigureAwait(false);
                Assert.That(everyPartCreated, Is.True,
                    "every item across every partition must reach Created");
                Assert.That(((IPartitionedSubscription)sub).PartitionCount,
                    Is.GreaterThanOrEqualTo(2),
                    "test setup requires the engine to mint at least one " +
                    "secondary partition to exercise the hook");

                // Verify notifications flow end-to-end (proves the
                // durable subscription is publishing items the
                // wrapper handler can observe).
                bool gotData = await handler.WaitForFirstDataAsync(
                    TimeSpan.FromSeconds(15), ct).ConfigureAwait(false);
                Assert.That(gotData, Is.True);

                await sub.DisposeAsync().ConfigureAwait(false);
            }
            finally
            {
                try
                {
                    await session.CloseAsync().ConfigureAwait(false);
                }
                catch
                { /* best effort */
                }
                try
                {
                    await session.DisposeAsync().ConfigureAwait(false);
                }
                catch
                { /* best effort */
                }
            }
        }

        private async Task<ManagedSession> ConnectV2Async(
            string sessionName, CancellationToken ct)
        {
            ConfiguredEndpoint endpoint = await ClientFixture
                .GetEndpointAsync(ServerUrl, SecurityPolicies.None)
                .ConfigureAwait(false);
            return await new ManagedSessionBuilder(ClientFixture.Config, Telemetry)
                .UseEndpoint(endpoint)
                .WithSessionName(sessionName)
                .WithSessionTimeout(TimeSpan.FromSeconds(120))
                .ConnectAsync(ct).ConfigureAwait(false);
        }

        private static async Task<bool> WaitForAsync(
            Func<bool> predicate, TimeSpan timeout, CancellationToken ct)
        {
            DateTime deadline = DateTime.UtcNow + timeout;
            while (DateTime.UtcNow < deadline)
            {
                ct.ThrowIfCancellationRequested();
                if (predicate())
                {
                    return true;
                }
                await Task.Delay(50, ct).ConfigureAwait(false);
            }
            return predicate();
        }
    }
}