[CONFIGURATION] File configuration - cmake build

.github/workflows/ci.yml

@@ -182,6 +182,45 @@ jobs:
       run: |
         (cd ./functional/otlp; ./run_test.sh)
 
+  cmake_clang_yaml_config:
+    name: CMake clang 18 (maintainer mode, yaml config)
+    runs-on: ubuntu-24.04
+    env:
+      CC: /usr/bin/clang-18
+      CXX: /usr/bin/clang++-18
+      CXX_STANDARD: '14'
+    steps:
+    - name: Harden the runner (Audit all outbound calls)
+      uses: step-security/harden-runner@6c439dc8bdf85cadbbce9ed30d1c7b959517bc49 # v2.12.2
+      with:
+        egress-policy: audit
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      with:
+        submodules: 'recursive'
+    - name: setup
+      run: |
+        sudo -E ./ci/setup_ci_environment.sh
+    - name: install dependencies
+      run: |
+        sudo -E ./ci/install_thirdparty.sh --install-dir /usr/local --tags-file third_party_release
+    - name: run cmake clang (maintainer mode, sync)
+      run: |
+        ./ci/do_ci.sh cmake.maintainer.yaml.test
+    - name: install shelltest
+      run: sudo apt update && sudo apt-get install -y shelltestrunner
+    - name: generate test cert
+      env:
+        CFSSL_VERSION: 1.6.3
+      run: |
+        sudo -E ./tools/setup-cfssl.sh
+        (cd ./functional/cert; ./generate_cert.sh)
+    - name: run otlp func test
+      run: |
+        (cd ./functional/otlp; ./run_test.sh)
+    - name: run configuration func test
+      run: |
+        (cd ./functional/configuration; ./run_test.sh)
+
   cmake_clang_maintainer_async_test:
     name: CMake clang 18 (maintainer mode, async)
     runs-on: ubuntu-24.04

.github/workflows/clang-tidy.yaml

@@ -17,9 +17,9 @@ jobs:
       matrix:
         include:
           - cmake_options: all-options-abiv1-preview
-            warning_limit: 61
+            warning_limit: 63
           - cmake_options: all-options-abiv2-preview
-            warning_limit: 61
+            warning_limit: 63
     steps:
       - name: Harden the runner (Audit all outbound calls)
         uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
@@ -49,6 +49,12 @@ jobs:
           libgtest-dev \
           libbenchmark-dev
 
+      - name: Install rapidyaml
+        run: |
+          sudo -E ./ci/install_thirdparty.sh --install-dir /usr/local --tags-file third_party_release --packages "ryml"
+
+      - name: Check clang-tidy
+        run: |
           if ! command -v clang-tidy &> /dev/null; then
             echo "clang-tidy could not be found"
             exit 1

.github/workflows/iwyu.yml

@@ -53,9 +53,15 @@ jobs:
             llvm-dev \
             libclang-dev \
             cmake
+
+      - name: Install rapidyaml
+        run: |
+          sudo -E ./ci/install_thirdparty.sh --install-dir /usr/local --tags-file third_party_release --packages "ryml"
+
       - name: Install include-what-you-use
         run: |
           sudo ./ci/install_iwyu.sh
+
       - name: Prepare CMake
         env:
           CC: clang

.iwyu.imp

@@ -11,6 +11,17 @@
   { "include": ["<bits/types/struct_tm.h>", "private", "<time.h>", "public"] },
   { "include": ["<bits/types/struct_FILE.h>", "private", "<stdio.h>", "public"] },
 
+  # Work around for ryml
+  { "include": ["<c4/std/string.hpp>", "private", "<ryml_std.hpp>", "public"] },
+
+  { "include": ["<c4/yml/node.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/yml/parse.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/yml/parse_engine.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/yml/tree.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/yml/event_handler_tree.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/substr.hpp>", "private", "<ryml.hpp>", "public"] },
+  { "include": ["<c4/substr_fwd.hpp>", "private", "<ryml.hpp>", "public"] },
+
   # Local opentelemetry-cpp style
 
   # We prefer to include <gtest/gtest.h> for simplicity

CMakeLists.txt

@@ -66,6 +66,8 @@ endif()
 option(WITH_ABI_VERSION_1 "ABI version 1" ON)
 option(WITH_ABI_VERSION_2 "EXPERIMENTAL: ABI version 2 preview" OFF)
 
+option(WITH_CONFIGURATION "EXPERIMENTAL: YAML configuration file" OFF)
+
 #
 # We do not want to have WITH_ABI_VERSION = "1" or "2", and instead prefer two
 # distinct flags, WITH_ABI_VERSION_1 and WITH_ABI_VERSION_2.
@@ -349,6 +351,14 @@ if((NOT WITH_API_ONLY) AND USE_NLOHMANN_JSON)
   include("${opentelemetry-cpp_SOURCE_DIR}/cmake/nlohmann-json.cmake")
 endif()
 
+#
+# Do we need RapidYaml ?
+#
+
+if((NOT WITH_API_ONLY) AND WITH_CONFIGURATION)
+  include("${opentelemetry-cpp_SOURCE_DIR}/cmake/ryml.cmake")
+endif()
+
 #
 # Do we need OpenTracing ?
 #
@@ -499,6 +509,7 @@ message(STATUS "WITH_ELASTICSEARCH: ${WITH_ELASTICSEARCH}")
 message(STATUS "WITH_OPENTRACING: ${WITH_OPENTRACING}")
 message(STATUS "WITH_ETW: ${WITH_ETW}")
 message(STATUS "OPENTELEMETRY_BUILD_DLL: ${OPENTELEMETRY_BUILD_DLL}")
+message(STATUS "WITH_CONFIGURATION: ${WITH_CONFIGURATION}")
 
 message(STATUS "---------------------------------------------")
 message(STATUS "feature preview options")
@@ -580,6 +591,9 @@ if(WITH_OPENTRACING)
   message(
     STATUS "opentracing-cpp: ${OpenTracing_VERSION} (${OpenTracing_PROVIDER})")
 endif()
+if(ryml_VERSION)
+  message(STATUS "ryml: ${ryml_VERSION} (${ryml_PROVIDER})")
+endif()
 message(STATUS "---------------------------------------------")
 
 include("${opentelemetry-cpp_SOURCE_DIR}/cmake/otel-install-functions.cmake")

ci/do_ci.sh

@@ -171,6 +171,31 @@ elif [[ "$1" == "cmake.maintainer.abiv2.test" ]]; then
   eval "$MAKE_COMMAND"
   make test
   exit 0
+elif [[ "$1" == "cmake.maintainer.yaml.test" ]]; then
+  cd "${BUILD_DIR}"
+  rm -rf *
+  cmake "${CMAKE_OPTIONS[@]}"  \
+        -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_GRPC=ON \
+        -DWITH_OTLP_FILE=ON \
+        -DWITH_PROMETHEUS=ON \
+        -DWITH_EXAMPLES=ON \
+        -DWITH_EXAMPLES_HTTP=ON \
+        -DWITH_ZIPKIN=ON \
+        -DBUILD_W3CTRACECONTEXT_TEST=ON \
+        -DWITH_ELASTICSEARCH=ON \
+        -DWITH_METRICS_EXEMPLAR_PREVIEW=ON \
+        -DWITH_ASYNC_EXPORT_PREVIEW=OFF \
+        -DOTELCPP_MAINTAINER_MODE=ON \
+        -DWITH_NO_DEPRECATED_CODE=ON \
+        -DWITH_OTLP_HTTP_COMPRESSION=ON \
+        -DWITH_OTLP_RETRY_PREVIEW=ON \
+        -DWITH_THREAD_INSTRUMENTATION_PREVIEW=ON \
+        -DWITH_CONFIGURATION=ON \
+        "${SRC_DIR}"
+  eval "$MAKE_COMMAND"
+  make test
+  exit 0
 elif [[ "$1" == "cmake.with_async_export.test" ]]; then
   cd "${BUILD_DIR}"
   rm -rf *

cmake/ryml.cmake

@@ -0,0 +1,30 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+# Import the rapidyaml target (ryml::ryml).
+# 1. Find an installed ryml package
+# 2. Use FetchContent to fetch and build ryml from GitHub
+
+find_package(ryml QUIET)
+set(ryml_PROVIDER "find_package")
+
+if(NOT ryml_FOUND)
+  FetchContent_Declare(
+    "ryml"
+    GIT_REPOSITORY "https://github.com/biojppm/rapidyaml.git"
+    GIT_TAG "${ryml_GIT_TAG}"
+    )
+  set(ryml_PROVIDER "fetch_repository")
+
+  set(RYML_ENABLE_TESTING OFF CACHE BOOL "" FORCE)
+  set(RYML_ENABLE_INSTALL OFF CACHE BOOL "" FORCE)
+
+  FetchContent_MakeAvailable(ryml)
+
+  # Set the ryml_VERSION variable from the git tag.
+  string(REGEX REPLACE "^v([0-9]+\\.[0-9]+\\.[0-9]+)$" "\\1" ryml_VERSION "${ryml_GIT_TAG}")
+endif()
+
+if(NOT TARGET ryml::ryml)
+  message(FATAL_ERROR "The required ryml::ryml target was not imported")
+endif()

cmake/thirdparty-dependency-config.cmake

@@ -16,6 +16,7 @@ set(OTEL_THIRDPARTY_DEPENDENCIES_SUPPORTED
      gRPC
      prometheus-cpp
      OpenTracing
+     ryml
 )
 
 #-----------------------------------------------------------------------
@@ -26,7 +27,7 @@ set(OTEL_THIRDPARTY_DEPENDENCIES_SUPPORTED
 set(OTEL_Protobuf_TARGET_NAMESPACE "protobuf")
 
 #-----------------------------------------------------------------------
-# Set the find_dependecy search mode - empty is default. Options: cmake default (empty string ""), "MODULE", or "CONFIG"
+# Set the find_dependency search mode - empty is default. Options: cmake default (empty string ""), "MODULE", or "CONFIG"
 # # set(OTEL_<dependency>_SEARCH_MODE "<search mode>")
 #-----------------------------------------------------------------------
 set(OTEL_Threads_SEARCH_MODE "")
@@ -37,6 +38,7 @@ set(OTEL_nlohmann_json_SEARCH_MODE "CONFIG")
 set(OTEL_gRPC_SEARCH_MODE "CONFIG")
 set(OTEL_prometheus-cpp_SEARCH_MODE "CONFIG")
 set(OTEL_OpenTracing_SEARCH_MODE "CONFIG")
+set(OTEL_ryml_SEARCH_MODE "")
 
 # The search mode is set to "CONFIG" for Protobuf versions >= 3.22.0
 # to find Protobuf's abseil dependency properly until the FindProtobuf module is updated support the upstream protobuf-config.cmake.
@@ -45,4 +47,4 @@ if(DEFINED Protobuf_VERSION AND Protobuf_VERSION VERSION_GREATER_EQUAL 3.22.0)
     set(OTEL_Protobuf_SEARCH_MODE "CONFIG")
 else()
     set(OTEL_Protobuf_SEARCH_MODE "")
-endif()
+endif()

examples/CMakeLists.txt

@@ -31,3 +31,7 @@ add_subdirectory(multi_processor)
 if(WITH_EXAMPLES_HTTP)
   add_subdirectory(http)
 endif()
+
+if(WITH_CONFIGURATION)
+  add_subdirectory(configuration)
+endif()

examples/configuration/CMakeLists.txt

@@ -0,0 +1,81 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+if(DEFINED OPENTELEMETRY_BUILD_DLL)
+  add_definitions(-DOPENTELEMETRY_BUILD_IMPORT_DLL)
+endif()
+
+add_executable(
+  example_yaml
+  main.cc
+  custom_sampler.cc
+  custom_sampler_builder.cc
+  custom_span_exporter.cc
+  custom_span_exporter_builder.cc
+  custom_span_processor.cc
+  custom_span_processor_builder.cc
+  custom_push_metric_exporter.cc
+  custom_push_metric_exporter_builder.cc
+  custom_pull_metric_exporter.cc
+  custom_pull_metric_exporter_builder.cc
+  custom_log_record_exporter.cc
+  custom_log_record_exporter_builder.cc
+  custom_log_record_processor.cc
+  custom_log_record_processor_builder.cc)
+
+target_link_libraries(
+  example_yaml ${CMAKE_THREAD_LIBS_INIT}
+  PRIVATE common_metrics_foo_library
+          common_logs_foo_library
+          opentelemetry-cpp::ostream_span_exporter_builder
+          opentelemetry-cpp::ostream_metrics_exporter_builder
+          opentelemetry-cpp::ostream_log_record_exporter_builder)
+
+if(WITH_OTLP_HTTP)
+  add_definitions(-DOTEL_HAVE_OTLP_HTTP)
+  target_link_libraries(
+    example_yaml
+    PRIVATE opentelemetry-cpp::otlp_http_exporter_builder
+            opentelemetry-cpp::otlp_http_log_record_exporter_builder
+            opentelemetry-cpp::otlp_http_metric_exporter_builder)
+endif()
+
+if(WITH_OTLP_GRPC)
+  add_definitions(-DOTEL_HAVE_OTLP_GRPC)
+  target_link_libraries(
+    example_yaml
+    PRIVATE opentelemetry-cpp::otlp_grpc_exporter_builder
+            opentelemetry-cpp::otlp_grpc_log_record_exporter_builder
+            opentelemetry-cpp::otlp_grpc_metrics_exporter_builder)
+endif()
+
+if(WITH_OTLP_FILE)
+  add_definitions(-DOTEL_HAVE_OTLP_FILE)
+  target_link_libraries(
+    example_yaml
+    PRIVATE opentelemetry-cpp::otlp_file_exporter_builder
+            opentelemetry-cpp::otlp_file_log_record_exporter_builder
+            opentelemetry-cpp::otlp_file_metric_exporter_builder)
+endif()
+
+if(WITH_ZIPKIN)
+  add_definitions(-DOTEL_HAVE_ZIPKIN)
+  target_link_libraries(
+    example_yaml PRIVATE opentelemetry-cpp::zipkin_trace_exporter_builder)
+endif()
+
+if(WITH_PROMETHEUS)
+  add_definitions(-DOTEL_HAVE_PROMETHEUS)
+  target_link_libraries(example_yaml
+                        PRIVATE opentelemetry-cpp::prometheus_exporter_builder)
+endif()
+
+if(DEFINED OPENTELEMETRY_BUILD_DLL)
+  target_link_libraries(example_yaml
+                        PRIVATE opentelemetry-cpp::opentelemetry_cpp)
+else()
+  target_link_libraries(
+    example_yaml
+    PRIVATE opentelemetry-cpp::configuration opentelemetry-cpp::common
+            opentelemetry-cpp::trace opentelemetry-cpp::logs)
+endif()