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CHEN Feng 92a08ae18b tracing: migrate opentracing-cpp → opentelemetry-cpp (API only) (#201) 
* tracing: migrate opentracing-cpp -> opentelemetry-cpp (API only)

opentracing-cpp is deprecated/superseded by OpenTelemetry. flare ships no real
tracer -- it exposes a pluggable abstraction (TracingOpsProvider / QuickerSpan /
TracingOps) over the tracing-API types, with providers plugged in by users.
Re-base that abstraction on the opentelemetry-cpp **API** (header-only, v1.27.0)
and drop opentracing-cpp from both build systems.

Scope: API only -- no SDK/exporter, so no protobuf/grpc is pulled in and the
deliberately-pinned (abseil-free) protobuf 3.21.12 stays intact. The
abstraction and the opaque `bytes tracing_context` wire format are kept; only
the types/bodies change.

Source (flare/rpc/tracing/):
- tracing_ops_provider.h: re-typed virtuals; new flare-owned SpanStartOptions
  (parent SpanContext + SpanKind + timestamps + start attrs) replacing
  opentracing::StartSpanOptions/ChildOf. Extract -> std::optional<SpanContext>.
- tracing_ops.h/.cc: span_ is nostd::shared_ptr<trace::Span>; SetAttribute/
  AddEvent/End; SpanContext is a value type; buffered ops keep flare's owning
  variant and convert to (non-owning) AttributeValue only at flush.
- framework_tags.h -> constexpr std::string_view; string_view_interop.h ->
  ToStd/ToOtel (nostd<->std). Standard-tag table is a literal allowlist;
  span.kind moves from a tag to SpanStartOptions::kind.
- Call sites rpc_channel.cc / normal_connection_handler.cc updated; rpc_meta.proto
  comment updated (wire field unchanged).
- Tests/benchmark rewritten onto a recording fake otel::trace::Span (OTel's noop
  span can't be asserted on); integration test asserts span kind via the
  provider-recorded "span.kind" instead of an opentracing tag.

Build:
- blade: BLADE_ROOT vcpkg_config gains opentelemetry-cpp; thin wrapper
  //thirdparty/opentelemetry-cpp:api (refs opentelemetry_common -- the api
  component is header-only with no .a; that lib's include dir carries the api +
  absl headers). opentracing thirdparty dir removed.
- bazel: deps.bzl http_archive for opentelemetry-cpp 1.27.0 + api-only
  bazel/opentelemetry-cpp.BUILD (header-only, bundled nostd -> no abseil);
  patch_cmds drop the archive's nested BUILDs so the api headers can be globbed.
  opentracing BUILD/patch + .bazelignore/.gitattributes entries removed.

Verified: blade and bazel both build //flare/rpc/tracing/... and pass
tracing_ops_test + integration_test.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* ci: bazelignore thirdparty/opentelemetry-cpp (blade BUILD)

The repo-wide `bazel build ...` job parses every BUILD file; the blade thin
wrapper thirdparty/opentelemetry-cpp/BUILD uses blade-only syntax
(vcpkg#...:lib, visibility='PUBLIC'). Add it to .bazelignore (the opentracing
entry was removed but its replacement wasn't added).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* tracing: clang-format (v15) the migrated files

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore: drop accidentally-committed .claude/ tooling files

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* doc(tracing): note provider ABI contract for OpenTelemetry nostd types

The TracingOpsProvider interface uses OpenTelemetry API types
(nostd::shared_ptr<Span>, nostd::string_view, AttributeValue) directly.
The nostd:: backing is a compile-time choice (bundled / std via
OPENTELEMETRY_STL_VERSION / abseil) and the three are mutually
incompatible types, so a provider must be built with the same
OpenTelemetry configuration as flare. flare leaves the default nostd
in place.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore: gitignore .claude/ (Claude Code local tooling)

Prevents accidentally re-committing .claude/settings*.json (cf. review
comments on PR #201).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* tracing: address PR #201 review follow-ups (non-blocking)

- forcibly_sampled now routes `flare.sampling_priority` through the
  provider's `SetFrameworkTag` translation (before `IsSampled`) instead of
  a raw `SetAttribute`, keeping the `flare.`-prefixed tag consistent with
  every other framework tag and letting providers honor the force-sample
  signal. Add `ext::kSamplingPriority`.
- An empty log key (single-arg `AddTracingLog`) now materializes as the
  default event name "log" so backends that group/display by event name
  don't render a blank one; document the per-log-event mapping.
- Guard `QuickerValue`'s reliance on P0608R3 (C++20) with a static_assert
  so a future standard downgrade can't silently bind `const char*` to bool.
- Reset `DummySpan`'s inline-static tags/logs at the start of the recording
  test so assertions can't observe leftovers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-20 00:36:01 +08:00

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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Code generated by the Protocol Buffer compiler is owned by the owner
of the input file used when generating it. This code is not
standalone and requires a support library to be linked with it. This
support library is itself covered by the above license.
Other Third-Party Components:
benchmark:
A copy of Apache verison 2.0 is included in this file.
Open Source Software Licensed under the BSD 3-Clause License and Other Licenses of the Third-Party Components therein:
--------------------------------------------------------------------
1. snappy
Copyright 2011, Google Inc.
All rights reserved.
A copy of the BSD 3-Clause License is included in this file.
Other Third-Party Components:
Some of the benchmark data in testdata/ is licensed differently:
- fireworks.jpeg is Copyright 2013 Steinar H. Gunderson, and
is licensed under the Creative Commons Attribution 3.0 license
(CC-BY-3.0). See https://creativecommons.org/licenses/by/3.0/
for more information.
- kppkn.gtb is taken from the Gaviota chess tablebase set, and
is licensed under the MIT License. See
https://sites.google.com/site/gaviotachessengine/Home/endgame-tablebases-1
for more information.
- paper-100k.pdf is an excerpt (bytes 92160 to 194560) from the paper
“Combinatorial Modeling of Chromatin Features Quantitatively Predicts DNA
Replication Timing in _Drosophila_” by Federico Comoglio and Renato Paro,
which is licensed under the CC-BY license. See
http://www.ploscompbiol.org/static/license for more ifnormation.
- alice29.txt, asyoulik.txt, plrabn12.txt and lcet10.txt are from Project
Gutenberg. The first three have expired copyrights and are in the public
domain; the latter does not have expired copyright, but is still in the
public domain according to the license information
(http://www.gutenberg.org/ebooks/53).
Open Source Software Licensed under the curl License:
--------------------------------------------------------------------
1. curl
Copyright (c) 1996 - 2020, Daniel Stenberg, <daniel@haxx.se>, and many
contributors, see the THANKS file. All rights reserved.
Terms of the curl License:
--------------------------------------------------------------------
Permission to use, copy, modify, and distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright
notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of a copyright holder shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization of the copyright holder.
Open Source Software Licensed under the MIT License:
--------------------------------------------------------------------
1. rapidxml
Copyright (c) 2006, 2007 Marcin Kalicinski
All rights reserved.
2. yaml-cpp
Copyright (c) 2008-2015 Jesse Beder
All rights reserved
Terms of the MIT License:
--------------------------------------------------------------------
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Open Source Software Licensed under the MIT License and Other Licenses of the Third-Party Components therein:
--------------------------------------------------------------------
1. nghttp2
Copyright (c) 2012, 2014, 2015, 2016 Tatsuhiro Tsujikawa
Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors
A copy of MIT license is included in this file.
Other Third-Party Components:
llhttp:
A copy of MIT license is included in this file.
mruby:
A copy of MIT license is included in this file.
neverbleed:
A copy of MIT license is included in this file.
url-parser:
A copy of MIT license is included in this file.
Open Source Software Licensed under the MIT License with Optional exception:
--------------------------------------------------------------------
1. fmt
Copyright (c) 2012 - present, Victor Zverovich
All rights reserved.
Terms of the MIT License with Optional exception:
--------------------------------------------------------------------
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- Optional exception to the license ---
As an exception, if, as a result of your compiling your source code, portions of this Software are embedded into a machine-executable object form of such source code, you may redistribute such embedded portions in such object form without including the above copyright and permission notices.
Open Source Software Licensed under the OpenSSL License and the Original SSLeay License:
--------------------------------------------------------------------
1. openssl
Copyright (c) 1998-2019 The OpenSSL Project
Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
All rights reserved.
Terms of the OpenSSL License and the Original SSLeay License:
--------------------------------------------------------------------
* Copyright (c) 1998-2018 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
Terms of the Original SSLeay License:
--------------------------------------------------------------------
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
Open Source Software Licensed under the Public Domain or MIT license:
--------------------------------------------------------------------
1. jsoncpp
N/A or Copyright (c) 2007-2010 Baptiste Lepilleur
The JsonCpp library's source code, including accompanying documentation,
tests and demonstration applications, are licensed under the following
conditions...
The author (Baptiste Lepilleur) explicitly disclaims copyright in all
jurisdictions which recognize such a disclaimer. In such jurisdictions,
this software is released into the Public Domain.
In jurisdictions which do not recognize Public Domain property (e.g. Germany as of
2010), this software is Copyright (c) 2007-2010 by Baptiste Lepilleur, and is
released under the terms of the MIT License (see below).
In jurisdictions which recognize Public Domain property, the user of this
software may choose to accept it either as 1) Public Domain, 2) under the
conditions of the MIT License (see below), or 3) under the terms of dual
Public Domain/MIT License conditions described here, as they choose.
The MIT License is about as close to Public Domain as a license can get, and is
described in clear, concise terms at:
http://en.wikipedia.org/wiki/MIT_License
The full text of the MIT License follows:
========================================================================
Copyright (c) 2007-2010 Baptiste Lepilleur
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
========================================================================
(END LICENSE TEXT)
The MIT license is compatible with both the GPL and commercial
software, affording one all of the rights of Public Domain with the
minor nuisance of being required to keep the above copyright notice
and license text in the source code. Note also that by accepting the
Public Domain "license" you can re-license your copy using whatever
license you like.
Open Source Software Licensed under the Zlib License:
--------------------------------------------------------------------
1. zlib
Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
All rights reserved.
Terms of the Zlib License:
--------------------------------------------------------------------
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
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