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| 1 | +// (c) Copyright IBM Corp. 2024 |
| 2 | + |
| 3 | +//go:build go1.22 |
| 4 | +// +build go1.22 |
| 5 | + |
| 6 | +package main |
| 7 | + |
| 8 | +import ( |
| 9 | + "context" |
| 10 | + "io" |
| 11 | + "log" |
| 12 | + "time" |
| 13 | + |
| 14 | + instana "github.com/instana/go-sensor" |
| 15 | + pb "github.com/instana/go-sensor/example/grpc/hellopb" |
| 16 | + "github.com/instana/go-sensor/instrumentation/instagrpc" |
| 17 | + "github.com/opentracing/opentracing-go/ext" |
| 18 | + "google.golang.org/grpc" |
| 19 | +) |
| 20 | + |
| 21 | +func main() { |
| 22 | + |
| 23 | + sensor := instana.NewSensor("grpc-client") |
| 24 | + |
| 25 | + // Connect to the server. |
| 26 | + conn, err := grpc.Dial("localhost:50051", |
| 27 | + grpc.WithInsecure(), |
| 28 | + grpc.WithUnaryInterceptor(instagrpc.UnaryClientInterceptor(sensor)), |
| 29 | + grpc.WithStreamInterceptor(instagrpc.StreamClientInterceptor(sensor))) |
| 30 | + if err != nil { |
| 31 | + log.Fatalf("Failed to connect: %v", err) |
| 32 | + } |
| 33 | + defer conn.Close() |
| 34 | + |
| 35 | + client := pb.NewGreeterClient(conn) |
| 36 | + |
| 37 | + // Unary call |
| 38 | + doUnaryCall(sensor, client) |
| 39 | + |
| 40 | + // Server-side streaming call |
| 41 | + doStreamingCall(sensor, client) |
| 42 | + |
| 43 | + // Make a call to an unknown service/method. |
| 44 | + doUnknownServiceCall(sensor, conn) |
| 45 | + |
| 46 | + time.Sleep(10 * time.Minute) |
| 47 | +} |
| 48 | + |
| 49 | +func doUnknownServiceCall(sensor instana.TracerLogger, client *grpc.ClientConn) { |
| 50 | + |
| 51 | + sp := sensor.Tracer(). |
| 52 | + StartSpan("grpc-unknown-service-call"). |
| 53 | + SetTag(string(ext.SpanKind), "entry") |
| 54 | + |
| 55 | + sp.Finish() |
| 56 | + |
| 57 | + ctx := instana.ContextWithSpan(context.Background(), sp) |
| 58 | + |
| 59 | + // Invoke a non-existent method (this will trigger the UnknownServiceHandler). |
| 60 | + err := client.Invoke(ctx, "/UnknownService/UnknownMethod", nil, nil) |
| 61 | + if err != nil { |
| 62 | + log.Printf("Error from server: %v", err) |
| 63 | + } else { |
| 64 | + log.Println("Call succeeded (unexpected).") |
| 65 | + } |
| 66 | +} |
| 67 | + |
| 68 | +func doUnaryCall(sensor instana.TracerLogger, client pb.GreeterClient) { |
| 69 | + |
| 70 | + sp := sensor.Tracer(). |
| 71 | + StartSpan("grpc-unary-client-call"). |
| 72 | + SetTag(string(ext.SpanKind), "entry") |
| 73 | + |
| 74 | + sp.Finish() |
| 75 | + |
| 76 | + ctx := instana.ContextWithSpan(context.Background(), sp) |
| 77 | + |
| 78 | + log.Println("Starting Unary Call...") |
| 79 | + ctx, cancel := context.WithTimeout(ctx, time.Second) |
| 80 | + defer cancel() |
| 81 | + |
| 82 | + resp, err := client.SayHello(ctx, &pb.HelloRequest{Name: "World"}) |
| 83 | + if err != nil { |
| 84 | + log.Fatalf("Unary call failed: %v", err) |
| 85 | + } |
| 86 | + log.Printf("Unary Response: %s", resp.GetMessage()) |
| 87 | +} |
| 88 | + |
| 89 | +func doStreamingCall(sensor instana.TracerLogger, client pb.GreeterClient) { |
| 90 | + |
| 91 | + sp := sensor.Tracer(). |
| 92 | + StartSpan("grpc-stream-client-call"). |
| 93 | + SetTag(string(ext.SpanKind), "entry") |
| 94 | + |
| 95 | + sp.Finish() |
| 96 | + |
| 97 | + ctx := instana.ContextWithSpan(context.Background(), sp) |
| 98 | + |
| 99 | + log.Println("Starting Streaming Call...") |
| 100 | + ctx, cancel := context.WithTimeout(ctx, 10*time.Second) |
| 101 | + defer cancel() |
| 102 | + |
| 103 | + stream, err := client.SayHelloStream(ctx, &pb.HelloRequest{Name: "World"}) |
| 104 | + if err != nil { |
| 105 | + log.Fatalf("Streaming call failed: %v", err) |
| 106 | + } |
| 107 | + |
| 108 | + for { |
| 109 | + resp, err := stream.Recv() |
| 110 | + if err == io.EOF { |
| 111 | + log.Println("Streaming completed.") |
| 112 | + break |
| 113 | + } |
| 114 | + if err != nil { |
| 115 | + log.Fatalf("Error receiving stream: %v", err) |
| 116 | + } |
| 117 | + log.Printf("Streaming Response: %s", resp.GetMessage()) |
| 118 | + } |
| 119 | +} |
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