Delegate all API calls of gRPC into `opentelemetry_exporter_otlp_grpc…

…_client`, and make it contains all symbols needed.

Signed-off-by: owent <admin@owent.net>

.vscode/launch.json

@@ -1,24 +1,24 @@
 {
   "version": "0.2.0",
   "configurations": [
-      {
-          "name": "Debug on Windows",
-          "type": "cppvsdbg",
-          "request": "launch",
-          "program": "${workspaceFolder}/build/<path-to-bin-file>",
-          "args": [],
-          "stopAtEntry": false,
-          "cwd": "${workspaceFolder}",
-          "environment": [],
-          "externalConsole": false
-      },
-      {
-          "name": "Debug on Linux",
-          "type": "gdb",
-          "request": "launch",
-          "target": "${workspaceFolder}/bazel-bin/<path to the bin file>",
-          "cwd": "${workspaceRoot}",
-          "valuesFormatting": "parseText"
-      }
+    {
+      "name": "Debug on Windows",
+      "type": "cppvsdbg",
+      "request": "launch",
+      "program": "${workspaceFolder}/build/exporters/ostream/Debug/ostream_log_test.exe",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}",
+      "environment": [],
+      "externalConsole": false
+    },
+    {
+      "name": "Debug on Linux",
+      "type": "gdb",
+      "request": "launch",
+      "target": "${workspaceFolder}/bazel-bin/<path to the bin file>",
+      "cwd": "${workspaceRoot}",
+      "valuesFormatting": "parseText"
+    }
   ]
 }

exporters/otlp/include/opentelemetry/exporters/otlp/otlp_grpc_client.h

@@ -9,6 +9,17 @@
 
 #include "opentelemetry/exporters/otlp/otlp_grpc_exporter_options.h"
 
+#include "opentelemetry/exporters/otlp/protobuf_include_prefix.h"
+
+#include "opentelemetry/proto/collector/metrics/v1/metrics_service.grpc.pb.h"
+#include "opentelemetry/proto/collector/trace/v1/trace_service.grpc.pb.h"
+
+#ifdef ENABLE_LOGS_PREVIEW
+#  include "opentelemetry/proto/collector/logs/v1/logs_service.grpc.pb.h"
+#endif
+
+#include "opentelemetry/exporters/otlp/protobuf_include_suffix.h"
+
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace exporter
 {
@@ -33,14 +44,49 @@ class OtlpGrpcClient
       const OtlpGrpcExporterOptions &options);
 
   /**
-   * Create service stub to communicate with the OpenTelemetry Collector.
+   * Create gRPC CompletionQueue to async call RPC.
+   */
+  static std::unique_ptr<grpc::CompletionQueue> MakeCompletionQueue();
+
+  /**
+   * Create trace service stub to communicate with the OpenTelemetry Collector.
+   */
+  static std::unique_ptr<proto::collector::trace::v1::TraceService::StubInterface>
+  MakeTraceServiceStub(const OtlpGrpcExporterOptions &options);
+
+  /**
+   * Create metrics service stub to communicate with the OpenTelemetry Collector.
+   */
+  static std::unique_ptr<proto::collector::metrics::v1::MetricsService::StubInterface>
+  MakeMetricsServiceStub(const OtlpGrpcExporterOptions &options);
+
+#ifdef ENABLE_LOGS_PREVIEW
+  /**
+   * Create logs service stub to communicate with the OpenTelemetry Collector.
    */
-  template <class ServiceType>
-  static std::unique_ptr<typename ServiceType::Stub> MakeServiceStub(
-      const OtlpGrpcExporterOptions &options)
-  {
-    return ServiceType::NewStub(MakeChannel(options));
-  }
+  static std::unique_ptr<proto::collector::logs::v1::LogsService::StubInterface>
+  MakeLogsServiceStub(const OtlpGrpcExporterOptions &options);
+#endif
+
+  static grpc::Status DelegateExport(
+      proto::collector::trace::v1::TraceService::StubInterface *stub,
+      grpc::ClientContext *context,
+      const proto::collector::trace::v1::ExportTraceServiceRequest &request,
+      proto::collector::trace::v1::ExportTraceServiceResponse *response);
+
+  static grpc::Status DelegateExport(
+      proto::collector::metrics::v1::MetricsService::StubInterface *stub,
+      grpc::ClientContext *context,
+      const proto::collector::metrics::v1::ExportMetricsServiceRequest &request,
+      proto::collector::metrics::v1::ExportMetricsServiceResponse *response);
+
+#ifdef ENABLE_LOGS_PREVIEW
+  static grpc::Status DelegateExport(
+      proto::collector::logs::v1::LogsService::StubInterface *stub,
+      grpc::ClientContext *context,
+      const proto::collector::logs::v1::ExportLogsServiceRequest &request,
+      proto::collector::logs::v1::ExportLogsServiceResponse *response);
+#endif
 };
 }  // namespace otlp
 }  // namespace exporter

exporters/otlp/src/otlp_grpc_client.cc

@@ -103,6 +103,60 @@ std::unique_ptr<grpc::ClientContext> OtlpGrpcClient::MakeClientContext(
   return context;
 }
 
+std::unique_ptr<grpc::CompletionQueue> OtlpGrpcClient::MakeCompletionQueue()
+{
+  return std::unique_ptr<grpc::CompletionQueue>(new grpc::CompletionQueue());
+}
+
+std::unique_ptr<proto::collector::trace::v1::TraceService::StubInterface>
+OtlpGrpcClient::MakeTraceServiceStub(const OtlpGrpcExporterOptions &options)
+{
+  return proto::collector::trace::v1::TraceService::NewStub(MakeChannel(options));
+}
+
+std::unique_ptr<proto::collector::metrics::v1::MetricsService::StubInterface>
+OtlpGrpcClient::MakeMetricsServiceStub(const OtlpGrpcExporterOptions &options)
+{
+  return proto::collector::metrics::v1::MetricsService::NewStub(MakeChannel(options));
+}
+
+#ifdef ENABLE_LOGS_PREVIEW
+std::unique_ptr<proto::collector::logs::v1::LogsService::StubInterface>
+OtlpGrpcClient::MakeLogsServiceStub(const OtlpGrpcExporterOptions &options)
+{
+  return proto::collector::logs::v1::LogsService::NewStub(MakeChannel(options));
+}
+#endif
+
+grpc::Status OtlpGrpcClient::DelegateExport(
+    proto::collector::trace::v1::TraceService::StubInterface *stub,
+    grpc::ClientContext *context,
+    const proto::collector::trace::v1::ExportTraceServiceRequest &request,
+    proto::collector::trace::v1::ExportTraceServiceResponse *response)
+{
+  return stub->Export(context, request, response);
+}
+
+grpc::Status OtlpGrpcClient::DelegateExport(
+    proto::collector::metrics::v1::MetricsService::StubInterface *stub,
+    grpc::ClientContext *context,
+    const proto::collector::metrics::v1::ExportMetricsServiceRequest &request,
+    proto::collector::metrics::v1::ExportMetricsServiceResponse *response)
+{
+  return stub->Export(context, request, response);
+}
+
+#ifdef ENABLE_LOGS_PREVIEW
+grpc::Status OtlpGrpcClient::DelegateExport(
+    proto::collector::logs::v1::LogsService::StubInterface *stub,
+    grpc::ClientContext *context,
+    const proto::collector::logs::v1::ExportLogsServiceRequest &request,
+    proto::collector::logs::v1::ExportLogsServiceResponse *response)
+{
+  return stub->Export(context, request, response);
+}
+#endif
+
 }  // namespace otlp
 }  // namespace exporter
 OPENTELEMETRY_END_NAMESPACE

exporters/otlp/src/otlp_grpc_exporter.cc

@@ -23,9 +23,7 @@ namespace otlp
 OtlpGrpcExporter::OtlpGrpcExporter() : OtlpGrpcExporter(OtlpGrpcExporterOptions()) {}
 
 OtlpGrpcExporter::OtlpGrpcExporter(const OtlpGrpcExporterOptions &options)
-    : options_(options),
-      trace_service_stub_(
-          OtlpGrpcClient::MakeServiceStub<proto::collector::trace::v1::TraceService>(options))
+    : options_(options), trace_service_stub_(OtlpGrpcClient::MakeTraceServiceStub(options))
 {}
 
 OtlpGrpcExporter::OtlpGrpcExporter(
@@ -60,7 +58,8 @@ sdk::common::ExportResult OtlpGrpcExporter::Export(
   auto context = OtlpGrpcClient::MakeClientContext(options_);
   proto::collector::trace::v1::ExportTraceServiceResponse response;
 
-  grpc::Status status = trace_service_stub_->Export(context.get(), request, &response);
+  grpc::Status status =
+      OtlpGrpcClient::DelegateExport(trace_service_stub_.get(), context.get(), request, &response);
 
   if (!status.ok())
   {

exporters/otlp/src/otlp_grpc_log_record_exporter.cc

@@ -36,9 +36,7 @@ OtlpGrpcLogRecordExporter::OtlpGrpcLogRecordExporter()
 {}
 
 OtlpGrpcLogRecordExporter::OtlpGrpcLogRecordExporter(const OtlpGrpcExporterOptions &options)
-    : options_(options),
-      log_service_stub_(
-          OtlpGrpcClient::MakeServiceStub<proto::collector::logs::v1::LogsService>(options))
+    : options_(options), log_service_stub_(OtlpGrpcClient::MakeLogsServiceStub(options))
 {}
 
 OtlpGrpcLogRecordExporter::OtlpGrpcLogRecordExporter(
@@ -74,7 +72,8 @@ opentelemetry::sdk::common::ExportResult OtlpGrpcLogRecordExporter::Export(
   auto context = OtlpGrpcClient::MakeClientContext(options_);
   proto::collector::logs::v1::ExportLogsServiceResponse response;
 
-  grpc::Status status = log_service_stub_->Export(context.get(), request, &response);
+  grpc::Status status =
+      OtlpGrpcClient::DelegateExport(log_service_stub_.get(), context.get(), request, &response);
 
   if (!status.ok())
   {

exporters/otlp/src/otlp_grpc_metric_exporter.cc

@@ -25,8 +25,7 @@ OtlpGrpcMetricExporter::OtlpGrpcMetricExporter(const OtlpGrpcMetricExporterOptio
     : options_(options),
       aggregation_temporality_selector_{
           OtlpMetricUtils::ChooseTemporalitySelector(options_.aggregation_temporality)},
-      metrics_service_stub_(
-          OtlpGrpcClient::MakeServiceStub<proto::collector::metrics::v1::MetricsService>(options))
+      metrics_service_stub_(OtlpGrpcClient::MakeMetricsServiceStub(options))
 {}
 
 OtlpGrpcMetricExporter::OtlpGrpcMetricExporter(
@@ -67,7 +66,8 @@ opentelemetry::sdk::common::ExportResult OtlpGrpcMetricExporter::Export(
   auto context = OtlpGrpcClient::MakeClientContext(options_);
   proto::collector::metrics::v1::ExportMetricsServiceResponse response;
 
-  grpc::Status status = metrics_service_stub_->Export(context.get(), request, &response);
+  grpc::Status status = OtlpGrpcClient::DelegateExport(metrics_service_stub_.get(), context.get(),
+                                                       request, &response);
 
   if (!status.ok())
   {