Otlp gRPC log example (#1083)

examples/otlp/BUILD

@@ -40,3 +40,17 @@ cc_binary(
         "//sdk/src/trace",
     ],
 )
+
+cc_binary(
+    name = "example_otlp_grpc_log",
+    srcs = [
+        "grpc_log_main.cc",
+    ],
+    deps = [
+        "//api",
+        "//examples/common/logs_foo_library:common_logs_foo_library",
+        "//exporters/otlp:otlp_grpc_exporter",
+        "//exporters/otlp:otlp_grpc_log_exporter",
+        "//sdk/src/trace",
+    ],
+)

examples/otlp/CMakeLists.txt

@@ -7,6 +7,18 @@ if(WITH_OTLP_GRPC)
   target_link_libraries(
     example_otlp_grpc ${CMAKE_THREAD_LIBS_INIT} common_foo_library
     opentelemetry_trace opentelemetry_exporter_otlp_grpc gRPC::grpc++)
+  if(WITH_LOGS_PREVIEW)
+    add_executable(example_otlp_grpc_log grpc_log_main.cc)
+    target_link_libraries(
+      example_otlp_grpc_log
+      ${CMAKE_THREAD_LIBS_INIT}
+      common_logs_foo_library
+      opentelemetry_trace
+      opentelemetry_logs
+      opentelemetry_exporter_otlp_grpc
+      opentelemetry_exporter_otlp_grpc_log
+      gRPC::grpc++)
+  endif()
 endif()
 
 if(WITH_OTLP_HTTP)

examples/otlp/README.md

@@ -6,8 +6,9 @@ Protocol](https://github.com/open-telemetry/opentelemetry-specification/blob/mai
 
 The application in `grpc_main.cc` initializes an `OtlpGrpcExporter` instance,
 the application in `http_main.cc` initializes an `OtlpHttpExporter` instance.
-The application in `http_log_main.cc` initializes an `OtlpHttpLogExporter` instance
-and they register a tracer provider from the [OpenTelemetry
+The application in `http_log_main.cc` initializes an `OtlpHttpLogExporter` instance,
+the application in `grpc_log_main.cc` initializes an `OtlpGrpcLogExporter` instance.
+And they register a tracer provider from the [OpenTelemetry
 SDK](https://github.com/open-telemetry/opentelemetry-cpp). The application then
 calls a `foo_library` which has been instrumented using the [OpenTelemetry
 API](https://github.com/open-telemetry/opentelemetry-cpp/tree/main/api).

examples/otlp/grpc_log_main.cc

@@ -0,0 +1,78 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#ifdef ENABLE_LOGS_PREVIEW
+#  include "opentelemetry/exporters/otlp/otlp_grpc_exporter.h"
+#  include "opentelemetry/exporters/otlp/otlp_grpc_log_exporter.h"
+#  include "opentelemetry/logs/provider.h"
+#  include "opentelemetry/sdk/logs/logger_provider.h"
+#  include "opentelemetry/sdk/logs/simple_log_processor.h"
+#  include "opentelemetry/sdk/trace/simple_processor.h"
+#  include "opentelemetry/sdk/trace/tracer_provider.h"
+#  include "opentelemetry/trace/provider.h"
+
+#  include <string>
+
+#  ifdef BAZEL_BUILD
+#    include "examples/common/logs_foo_library/foo_library.h"
+#  else
+#    include "logs_foo_library/foo_library.h"
+#  endif
+
+namespace trace     = opentelemetry::trace;
+namespace nostd     = opentelemetry::nostd;
+namespace otlp      = opentelemetry::exporter::otlp;
+namespace logs_sdk  = opentelemetry::sdk::logs;
+namespace logs      = opentelemetry::logs;
+namespace trace_sdk = opentelemetry::sdk::trace;
+
+namespace
+{
+opentelemetry::exporter::otlp::OtlpGrpcExporterOptions opts;
+void InitTracer()
+{
+  // Create OTLP exporter instance
+  auto exporter  = std::unique_ptr<trace_sdk::SpanExporter>(new otlp::OtlpGrpcExporter(opts));
+  auto processor = std::unique_ptr<trace_sdk::SpanProcessor>(
+      new trace_sdk::SimpleSpanProcessor(std::move(exporter)));
+  auto provider =
+      nostd::shared_ptr<trace::TracerProvider>(new trace_sdk::TracerProvider(std::move(processor)));
+  // Set the global trace provider
+  trace::Provider::SetTracerProvider(provider);
+}
+
+void InitLogger()
+{
+  // Create OTLP exporter instance
+  auto exporter  = std::unique_ptr<logs_sdk::LogExporter>(new otlp::OtlpGrpcLogExporter(opts));
+  auto processor = std::shared_ptr<logs_sdk::LogProcessor>(
+      new logs_sdk::SimpleLogProcessor(std::move(exporter)));
+  auto sdkProvider = std::shared_ptr<logs_sdk::LoggerProvider>(new logs_sdk::LoggerProvider());
+  sdkProvider->SetProcessor(processor);
+  auto apiProvider = nostd::shared_ptr<logs::LoggerProvider>(sdkProvider);
+  auto provider    = nostd::shared_ptr<logs::LoggerProvider>(apiProvider);
+  opentelemetry::logs::Provider::SetLoggerProvider(provider);
+}
+}  // namespace
+
+int main(int argc, char *argv[])
+{
+  if (argc > 1)
+  {
+    opts.endpoint = argv[1];
+    if (argc > 2)
+    {
+      opts.use_ssl_credentials         = true;
+      opts.ssl_credentials_cacert_path = argv[2];
+    }
+  }
+  InitLogger();
+  InitTracer();
+  foo_library();
+}
+#else
+int main()
+{
+  return 0;
+}
+#endif