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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"log"
"math/rand"
"net"
"time"
pb "go.opencensus.io/examples/grpc/proto"
"go.opencensus.io/trace"
"google.golang.org/grpc"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/contrib/propagators/opencensus"
"go.opentelemetry.io/otel"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
const address = "localhost:50051"
// server is used to implement helloworld.GreeterServer.
type server struct{}
// SayHello implements helloworld.GreeterServer.
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
_, span := trace.StartSpan(ctx, "sleep")
time.Sleep(time.Duration(rand.Float64() * float64(time.Second))) //nolint:gosec // Ignoring G404: Use of weak random number generator (math/rand instead of crypto/rand)
span.End()
return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}
func main() {
lis, err := net.Listen("tcp", address)
if err != nil {
log.Fatalf("Failed to listen: %v", err)
}
log.Println("Registering OpenTelemetry stdout exporter.")
otExporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
log.Fatal(err)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(otExporter),
sdktrace.WithSampler(sdktrace.AlwaysSample()),
)
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
otel.SetTracerProvider(tp)
// Set up a new server with the OpenCensus
// handler to enable tracing.
log.Println("Starting the GRPC server, and using the OpenCensus binary propagation format.")
s := grpc.NewServer(
grpc.StatsHandler(otelgrpc.NewServerHandler(otelgrpc.WithPropagators(opencensus.Binary{}))))
pb.RegisterGreeterServer(s, &server{})
if err := s.Serve(lis); err != nil {
log.Fatalf("Failed to serve: %v", err)
}
}
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