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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"errors"
"fmt"
"io"
"log"
"time"
"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"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/metadata"
)
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)
}
}()
var conn *grpc.ClientConn
conn, err = grpc.NewClient("127.0.0.1:7777", grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithStatsHandler(otelgrpc.NewClientHandler()),
)
if err != nil {
log.Fatalf("did not connect: %s", err)
}
defer func() { _ = conn.Close() }()
c := api.NewHelloServiceClient(conn)
if err := callSayHello(c); err != nil {
log.Fatal(err)
}
if err := callSayHelloClientStream(c); err != nil {
log.Fatal(err)
}
if err := callSayHelloServerStream(c); err != nil {
log.Fatal(err)
}
if err := callSayHelloBidiStream(c); err != nil {
log.Fatal(err)
}
time.Sleep(10 * time.Millisecond)
}
func callSayHello(c api.HelloServiceClient) error {
md := metadata.Pairs(
"timestamp", time.Now().Format(time.StampNano),
"client-id", "web-api-client-us-east-1",
"user-id", "some-test-user-id",
)
ctx := metadata.NewOutgoingContext(context.Background(), md)
response, err := c.SayHello(ctx, &api.HelloRequest{Greeting: "World"})
if err != nil {
return fmt.Errorf("calling SayHello: %w", err)
}
log.Printf("Response from server: %s", response.Reply)
return nil
}
func callSayHelloClientStream(c api.HelloServiceClient) error {
md := metadata.Pairs(
"timestamp", time.Now().Format(time.StampNano),
"client-id", "web-api-client-us-east-1",
"user-id", "some-test-user-id",
)
ctx := metadata.NewOutgoingContext(context.Background(), md)
stream, err := c.SayHelloClientStream(ctx)
if err != nil {
return fmt.Errorf("opening SayHelloClientStream: %w", err)
}
for i := 0; i < 5; i++ {
err := stream.Send(&api.HelloRequest{Greeting: "World"})
time.Sleep(time.Duration(i*50) * time.Millisecond)
if err != nil {
return fmt.Errorf("sending to SayHelloClientStream: %w", err)
}
}
response, err := stream.CloseAndRecv()
if err != nil {
return fmt.Errorf("closing SayHelloClientStream: %w", err)
}
log.Printf("Response from server: %s", response.Reply)
return nil
}
func callSayHelloServerStream(c api.HelloServiceClient) error {
md := metadata.Pairs(
"timestamp", time.Now().Format(time.StampNano),
"client-id", "web-api-client-us-east-1",
"user-id", "some-test-user-id",
)
ctx := metadata.NewOutgoingContext(context.Background(), md)
stream, err := c.SayHelloServerStream(ctx, &api.HelloRequest{Greeting: "World"})
if err != nil {
return fmt.Errorf("opening SayHelloServerStream: %w", err)
}
for {
response, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
} else if err != nil {
return fmt.Errorf("receiving from SayHelloServerStream: %w", err)
}
log.Printf("Response from server: %s", response.Reply)
time.Sleep(50 * time.Millisecond)
}
return nil
}
func callSayHelloBidiStream(c api.HelloServiceClient) error {
md := metadata.Pairs(
"timestamp", time.Now().Format(time.StampNano),
"client-id", "web-api-client-us-east-1",
"user-id", "some-test-user-id",
)
ctx := metadata.NewOutgoingContext(context.Background(), md)
stream, err := c.SayHelloBidiStream(ctx)
if err != nil {
return fmt.Errorf("opening SayHelloBidiStream: %w", err)
}
serverClosed := make(chan struct{})
clientClosed := make(chan struct{})
go func() {
for i := 0; i < 5; i++ {
err := stream.Send(&api.HelloRequest{Greeting: "World"})
if err != nil {
// nolint: revive // This acts as its own main func.
log.Fatalf("Error when sending to SayHelloBidiStream: %s", err)
}
time.Sleep(50 * time.Millisecond)
}
err := stream.CloseSend()
if err != nil {
// nolint: revive // This acts as its own main func.
log.Fatalf("Error when closing SayHelloBidiStream: %s", err)
}
clientClosed <- struct{}{}
}()
go func() {
for {
response, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
} else if err != nil {
// nolint: revive // This acts as its own main func.
log.Fatalf("Error when receiving from SayHelloBidiStream: %s", err)
}
log.Printf("Response from server: %s", response.Reply)
time.Sleep(50 * time.Millisecond)
}
serverClosed <- struct{}{}
}()
// Wait until client and server both closed the connection.
<-clientClosed
<-serverClosed
return nil
}
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