cancellation_client.go

func greetWithTimeout(c greetpb.GreetServiceClient) {
	req := &greetpb.GreetRequest{
		Greeting: &greetpb.Greeting{
			FirstName: "Ricardo",
			LastName:  "Linck",
		},
	}
	ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
	defer cancel()
	res, err := c.Greet(ctx, req)
	if err != nil {
		grpcErr, ok := status.FromError(err)

		if ok {
			if grpcErr.Code() == codes.DeadlineExceeded {
				log.Fatal("Deadline Exceeded")
			}
		}

		log.Fatalf("Error calling Greet RPC: %v", err)
	}
	log.Printf("Response: %s\n", res.Result)
}