[EXPORTER] OTLP file exporter (#2540)

CHANGELOG.md

@@ -15,6 +15,8 @@ Increment the:
 
 ## [Unreleased]
 
+* [EXPORTER] Add OTLP File exporters
+  [#2540](https://github.com/open-telemetry/opentelemetry-cpp/pull/2540)
 * [EXPORTER] Gzip compression support for OTLP/HTTP and OTLP/gRPC exporter
   [#2530](https://github.com/open-telemetry/opentelemetry-cpp/pull/2530)
 * [EXPORTER] Support URL-encoded values for `OTEL_EXPORTER_OTLP_HEADERS`

CMakeLists.txt

@@ -204,6 +204,9 @@ option(WITH_OTLP_GRPC "Whether to include the OTLP gRPC exporter in the SDK"
 option(WITH_OTLP_HTTP "Whether to include the OTLP http exporter in the SDK"
        OFF)
 
+option(WITH_OTLP_FILE "Whether to include the OTLP file exporter in the SDK"
+       OFF)
+
 option(
   WITH_OTLP_HTTP_COMPRESSION
   "Whether to include gzip compression for the OTLP http exporter in the SDK"
@@ -370,7 +373,9 @@ if(WITH_ABSEIL)
   find_package(absl CONFIG REQUIRED)
 endif()
 
-if(WITH_OTLP_GRPC OR WITH_OTLP_HTTP)
+if(WITH_OTLP_GRPC
+   OR WITH_OTLP_HTTP
+   OR WITH_OTLP_FILE)
   find_package(Protobuf)
   if(Protobuf_VERSION AND Protobuf_VERSION VERSION_GREATER_EQUAL "3.22.0")
     if(NOT WITH_ABSEIL)
@@ -473,6 +478,7 @@ endif()
 if(WITH_ELASTICSEARCH
    OR WITH_ZIPKIN
    OR WITH_OTLP_HTTP
+   OR WITH_OTLP_FILE
    OR BUILD_W3CTRACECONTEXT_TEST
    OR WITH_ETW)
   set(USE_NLOHMANN_JSON ON)

ci/do_ci.sh

@@ -114,6 +114,7 @@ elif [[ "$1" == "cmake.maintainer.sync.test" ]]; then
   rm -rf *
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_PROMETHEUS=ON \
         -DWITH_EXAMPLES=ON \
         -DWITH_EXAMPLES_HTTP=ON \
@@ -135,6 +136,7 @@ elif [[ "$1" == "cmake.maintainer.async.test" ]]; then
   rm -rf *
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_PROMETHEUS=ON \
         -DWITH_EXAMPLES=ON \
         -DWITH_EXAMPLES_HTTP=ON \
@@ -157,6 +159,7 @@ elif [[ "$1" == "cmake.maintainer.cpp11.async.test" ]]; then
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DCMAKE_CXX_STANDARD=11 \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_PROMETHEUS=ON \
         -DWITH_EXAMPLES=ON \
         -DWITH_EXAMPLES_HTTP=ON \
@@ -177,6 +180,7 @@ elif [[ "$1" == "cmake.maintainer.abiv2.test" ]]; then
   rm -rf *
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_PROMETHEUS=ON \
         -DWITH_EXAMPLES=ON \
         -DWITH_EXAMPLES_HTTP=ON \
@@ -327,6 +331,7 @@ elif [[ "$1" == "cmake.legacy.exporter.otprotocol.test" ]]; then
         -DCMAKE_CXX_STANDARD=11 \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
         "${SRC_DIR}"
   grpc_cpp_plugin=`which grpc_cpp_plugin`
@@ -344,6 +349,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.test" ]]; then
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_OTLP_GRPC_SSL_MTLS_PREVIEW=ON \
         "${SRC_DIR}"
   grpc_cpp_plugin=`which grpc_cpp_plugin`
@@ -358,6 +364,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.shared_libs.with_static_grpc.test" ]]
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DBUILD_SHARED_LIBS=ON \
         "${SRC_DIR}"
   grpc_cpp_plugin=`which grpc_cpp_plugin`
@@ -372,6 +379,7 @@ elif [[ "$1" == "cmake.exporter.otprotocol.with_async_export.test" ]]; then
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
         "${SRC_DIR}"
   grpc_cpp_plugin=`which grpc_cpp_plugin`
@@ -386,6 +394,7 @@ elif [[ "$1" == "cmake.do_not_install.test" ]]; then
   cmake "${CMAKE_OPTIONS[@]}"  \
         -DWITH_OTLP_GRPC=ON \
         -DWITH_OTLP_HTTP=ON \
+        -DWITH_OTLP_FILE=ON \
         -DWITH_ASYNC_EXPORT_PREVIEW=ON \
         -DOPENTELEMETRY_INSTALL=OFF \
         "${SRC_DIR}"

cmake/opentelemetry-cpp-config.cmake.in

@@ -41,6 +41,10 @@
 #   opentelemetry-cpp::otlp_http_exporter                - Imported target of opentelemetry-cpp::otlp_http_exporter
 #   opentelemetry-cpp::otlp_http_log_record_exporter     - Imported target of opentelemetry-cpp::otlp_http_log_record_exporter
 #   opentelemetry-cpp::otlp_http_metric_exporter         - Imported target of opentelemetry-cpp::otlp_http_metric_exporter
+#   opentelemetry-cpp::otlp_file_client                  - Imported target of opentelemetry-cpp::otlp_file_client
+#   opentelemetry-cpp::otlp_file_exporter                - Imported target of opentelemetry-cpp::otlp_file_exporter
+#   opentelemetry-cpp::otlp_file_log_record_exporter     - Imported target of opentelemetry-cpp::otlp_file_log_record_exporter
+#   opentelemetry-cpp::otlp_file_metric_exporter         - Imported target of opentelemetry-cpp::otlp_file_metric_exporter
 #   opentelemetry-cpp::ostream_log_record_exporter       - Imported target of opentelemetry-cpp::ostream_log_record_exporter
 #   opentelemetry-cpp::ostream_metrics_exporter          - Imported target of opentelemetry-cpp::ostream_metrics_exporter
 #   opentelemetry-cpp::ostream_span_exporter             - Imported target of opentelemetry-cpp::ostream_span_exporter
@@ -93,6 +97,10 @@ set(_OPENTELEMETRY_CPP_LIBRARIES_TEST_TARGETS
     otlp_http_exporter
     otlp_http_log_record_exporter
     otlp_http_metric_exporter
+    otlp_file_client
+    otlp_file_exporter
+    otlp_file_log_record_exporter
+    otlp_file_metric_exporter
     ostream_log_record_exporter
     ostream_metrics_exporter
     ostream_span_exporter

exporters/CMakeLists.txt

@@ -1,7 +1,9 @@
 # Copyright The OpenTelemetry Authors
 # SPDX-License-Identifier: Apache-2.0
 
-if(WITH_OTLP_GRPC OR WITH_OTLP_HTTP)
+if(WITH_OTLP_GRPC
+   OR WITH_OTLP_HTTP
+   OR WITH_OTLP_FILE)
   add_subdirectory(otlp)
 endif()