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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"errors"
"fmt"
"io"
"log"
"net"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc/example/api"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc/example/config"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"google.golang.org/grpc"
)
var tracer = otel.Tracer("grpc-example")
// server is used to implement api.HelloServiceServer.
type server struct {
api.HelloServiceServer
}
// SayHello implements api.HelloServiceServer.
func (s *server) SayHello(ctx context.Context, in *api.HelloRequest) (*api.HelloResponse, error) {
log.Printf("Received: %v\n", in.GetGreeting())
s.workHard(ctx)
time.Sleep(50 * time.Millisecond)
return &api.HelloResponse{Reply: "Hello " + in.Greeting}, nil
}
func (s *server) workHard(ctx context.Context) {
_, span := tracer.Start(ctx, "workHard",
trace.WithAttributes(attribute.String("extra.key", "extra.value")))
defer span.End()
time.Sleep(50 * time.Millisecond)
}
func (s *server) SayHelloServerStream(in *api.HelloRequest, out api.HelloService_SayHelloServerStreamServer) error {
log.Printf("Received: %v\n", in.GetGreeting())
for i := 0; i < 5; i++ {
err := out.Send(&api.HelloResponse{Reply: "Hello " + in.Greeting})
if err != nil {
return err
}
time.Sleep(time.Duration(i*50) * time.Millisecond)
}
return nil
}
func (s *server) SayHelloClientStream(stream api.HelloService_SayHelloClientStreamServer) error {
i := 0
for {
in, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
} else if err != nil {
log.Printf("Non EOF error: %v\n", err)
return err
}
log.Printf("Received: %v\n", in.GetGreeting())
i++
}
time.Sleep(50 * time.Millisecond)
return stream.SendAndClose(&api.HelloResponse{Reply: fmt.Sprintf("Hello (%v times)", i)})
}
func (s *server) SayHelloBidiStream(stream api.HelloService_SayHelloBidiStreamServer) error {
for {
in, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
} else if err != nil {
log.Printf("Non EOF error: %v\n", err)
return err
}
time.Sleep(50 * time.Millisecond)
log.Printf("Received: %v\n", in.GetGreeting())
err = stream.Send(&api.HelloResponse{Reply: "Hello " + in.Greeting})
if err != nil {
return err
}
}
return nil
}
func main() {
tp, err := config.Init()
if err != nil {
log.Fatal(err)
}
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
lis, err := net.Listen("tcp", "127.0.0.1:7777")
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer(
grpc.StatsHandler(otelgrpc.NewServerHandler()),
)
api.RegisterHelloServiceServer(s, &server{})
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
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