Add OpenTelemetry interceptors to capture traces from gRPC communicat…

…ions

Signed-off-by: Antoine Toulme <antoine@lunar-ocean.com>

common/grpctracing/grpctracing_suite_test.go

@@ -0,0 +1,28 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package grpctracing_test
+
+import (
+	"testing"
+
+	"github.com/hyperledger/fabric/common/grpctracing/testpb"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+//go:generate protoc --proto_path=testpb --go_out=plugins=grpc,paths=source_relative:testpb testpb/echo.proto
+
+func TestGrpctracing(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Grpctracing Suite")
+}
+
+//go:generate counterfeiter -o fakes/echo_service.go --fake-name EchoServiceServer . echoServiceServer
+
+type echoServiceServer interface {
+	testpb.EchoServiceServer
+}

common/grpctracing/interceptor.go

@@ -0,0 +1,20 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package grpctracing
+
+import (
+	"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
+	"google.golang.org/grpc"
+)
+
+func UnaryServerInterceptor() grpc.UnaryServerInterceptor {
+	return otelgrpc.UnaryServerInterceptor()
+}
+
+func StreamServerInterceptor() grpc.StreamServerInterceptor {
+	return otelgrpc.StreamServerInterceptor()
+}