feat: Add tracing hook.

Author: kinyoklion

.github/workflows/manual-publish-doc.yml

@@ -10,6 +10,7 @@ on:
           - libs/client-sdk
           - libs/server-sdk
           - libs/server-sdk-redis-source
+          - libs/server-sdk-otel
 name: Publish Documentation
 jobs:
   build-publish:

.github/workflows/manual-sdk-release-artifacts.yml

@@ -16,6 +16,7 @@ on:
           - libs/client-sdk:launchdarkly-cpp-client
           - libs/server-sdk:launchdarkly-cpp-server
           - libs/server-sdk-redis-source:launchdarkly-cpp-server-redis-source
+          - libs/server-sdk-otel:launchdarkly-cpp-server-otel
 
 name: Publish SDK Artifacts
 

.github/workflows/release-please.yml

@@ -14,6 +14,8 @@ jobs:
       package-server-tag: ${{ steps.release.outputs['libs/server-sdk--tag_name'] }}
       package-server-redis-released: ${{ steps.release.outputs['libs/server-sdk-redis-source--release_created'] }}
       package-server-redis-tag: ${{ steps.release.outputs['libs/server-sdk-redis-source--tag_name'] }}
+      package-server-otel-released: ${{ steps.release.outputs['libs/server-sdk-otel--release_created'] }}
+      package-server-otel-tag: ${{ steps.release.outputs['libs/server-sdk-otel--tag_name'] }}
     steps:
       - uses: googleapis/release-please-action@v4
         id: release
@@ -142,3 +144,44 @@ jobs:
       upload-assets: true
       upload-tag-name: ${{ needs.release-please.outputs.package-server-redis-tag }}
       provenance-name: ${{ format('{0}-server-redis-multiple-provenance.intoto.jsonl', matrix.os) }}
+
+  release-server-otel:
+    strategy:
+      matrix:
+        # Each of the platforms for which release-artifacts need generated.
+        os: [ ubuntu-22.04, windows-2022, macos-13 ]
+    runs-on: ${{ matrix.os }}
+    needs: [ 'release-please' ]
+    if: ${{ needs.release-please.outputs.package-server-otel-released  == 'true'}}
+    outputs:
+      hashes-linux: ${{ steps.release-server-otel.outputs.hashes-linux }}
+      hashes-windows: ${{ steps.release-server-otel.outputs.hashes-windows }}
+      hashes-macos: ${{ steps.release-server-otel.outputs.hashes-macos }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: release-server-otel
+        name: Full release of libs/server-sdk-otel
+        uses: ./.github/actions/sdk-release
+        with:
+          # The tag of the release to upload artifacts to.
+          tag_name: ${{ needs.release-please.outputs.package-server-otel-tag }}
+          github_token: ${{secrets.GITHUB_TOKEN}}
+          sdk_path: 'libs/server-sdk-otel'
+          sdk_cmake_target: 'launchdarkly-cpp-server-otel'
+
+  release-server-otel-provenance:
+    needs: [ 'release-please', 'release-server-otel' ]
+    strategy:
+      matrix:
+        # Generates a combined attestation for each platform
+        os: [ linux, windows, macos ]
+    permissions:
+      actions: read
+      id-token: write
+      contents: write
+    uses: slsa-framework/slsa-github-generator/.github/workflows/[email protected]
+    with:
+      base64-subjects: "${{ needs.release-server-otel.outputs[format('hashes-{0}', matrix.os)] }}"
+      upload-assets: true
+      upload-tag-name: ${{ needs.release-please.outputs.package-server-otel-tag }}
+      provenance-name: ${{ format('{0}-server-otel-multiple-provenance.intoto.jsonl', matrix.os) }}

.github/workflows/server-otel.yml

@@ -0,0 +1,51 @@
+name: libs/server-sdk-otel
+
+on:
+  push:
+    branches: [ main ]
+    paths-ignore:
+      - '**.md' # Do not need to run CI for markdown changes.
+  pull_request:
+    branches: [ "main", "feat/**" ]
+    paths-ignore:
+      - '**.md'
+  schedule:
+    # Run daily at midnight PST
+    - cron: '0 8 * * *'
+
+jobs:
+  build-test-otel:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/ci
+        with:
+          cmake_target: launchdarkly-cpp-server-otel
+          cmake_extra_options: '-DLD_BUILD_OTEL_SUPPORT=ON'
+          simulate_release: true
+  build-otel-mac:
+    runs-on: macos-13
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/ci
+        with:
+          cmake_target: launchdarkly-cpp-server-otel
+          cmake_extra_options: '-DLD_BUILD_OTEL_SUPPORT=ON'
+          platform_version: 12
+          simulate_release: true
+  build-test-otel-windows:
+    runs-on: windows-2022
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ilammy/msvc-dev-cmd@v1
+      - uses: ./.github/actions/ci
+        env:
+          BOOST_LIBRARY_DIR: 'C:\local\boost_1_87_0\lib64-msvc-14.3'
+          BOOST_LIBRARYDIR: 'C:\local\boost_1_87_0\lib64-msvc-14.3'
+          Boost_DIR: 'C:\local\boost_1_87_0\lib64-msvc-14.3\cmake\Boost-1.87.0'
+        with:
+          cmake_target: launchdarkly-cpp-server-otel
+          cmake_extra_options: '-DLD_BUILD_OTEL_SUPPORT=ON'
+          platform_version: 2022
+          toolset: msvc
+          simulate_windows_release: true

.release-please-manifest.json

@@ -4,5 +4,6 @@
   "libs/common": "1.10.0",
   "libs/internal": "0.12.1",
   "libs/server-sdk": "3.9.1",
-  "libs/server-sdk-redis-source": "2.2.0"
+  "libs/server-sdk-redis-source": "2.2.0",
+  "libs/server-sdk-otel": "0.0.0"
 }

CMakeLists.txt

@@ -101,6 +101,8 @@ option(LD_BUILD_EXAMPLES "Build hello-world examples." ON)
 
 option(LD_BUILD_REDIS_SUPPORT "Build redis support." OFF)
 
+option(LD_BUILD_OTEL_SUPPORT "Build OpenTelemetry integration." OFF)
+
 # If using 'make' as the build system, CMake causes the 'install' target to have a dependency on 'all', meaning
 # it will cause a full build. This disables that, allowing us to build piecemeal instead. This is useful
 # so that we only need to build the client or server for a given release (if only the client or server were affected.)
@@ -195,6 +197,11 @@ if (LD_BUILD_REDIS_SUPPORT)
     add_subdirectory(libs/server-sdk-redis-source)
 endif ()
 
+if (LD_BUILD_OTEL_SUPPORT)
+    message("LaunchDarkly: building OpenTelemetry integration")
+    add_subdirectory(libs/server-sdk-otel)
+endif ()
+
 # Built as static or shared depending on LD_BUILD_SHARED_LIBS variable.
 # This target "links" in common, internal, and sse as object libraries.
 add_subdirectory(libs/client-sdk)

examples/CMakeLists.txt

@@ -8,3 +8,7 @@ if (LD_BUILD_REDIS_SUPPORT)
     add_subdirectory(hello-cpp-server-redis)
     add_subdirectory(hello-c-server-redis)
 endif ()
+
+if (LD_BUILD_OTEL_SUPPORT)
+    add_subdirectory(hello-cpp-server-otel)
+endif ()

examples/hello-cpp-server-otel/CMakeLists.txt

@@ -0,0 +1,27 @@
+# Required for Apple Silicon support.
+cmake_minimum_required(VERSION 3.19)
+
+project(
+        LaunchDarklyHelloCPPServerOTel
+        VERSION 0.1
+        DESCRIPTION "LaunchDarkly Hello CPP Server-side SDK with OpenTelemetry Integration"
+        LANGUAGES CXX
+)
+
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+
+# Find Boost
+find_package(Boost 1.81 REQUIRED COMPONENTS system)
+
+add_executable(hello-cpp-server-otel main.cpp)
+
+target_link_libraries(hello-cpp-server-otel
+    PRIVATE
+    launchdarkly::server
+    launchdarkly::server_otel
+    Threads::Threads
+    ${Boost_LIBRARIES}
+    opentelemetry_trace
+    opentelemetry_exporter_otlp_http
+)