(TIDAK DIGUNAKAN LAGI) Membuat aplikasi pelanggan dengan OpenTelemetry yang diaktifkan

(TIDAK DIGUNAKAN LAGI) Membuat aplikasi pelanggan dengan OpenTelemetry yang diaktifkan

Contoh kode

Go

Sebelum mencoba contoh ini, ikuti petunjuk penyiapan Go di panduan memulai Pub/Sub menggunakan library klien. Untuk mengetahui informasi selengkapnya, lihat dokumentasi referensi API Go Pub/Sub.

Untuk melakukan autentikasi ke Pub/Sub, siapkan Kredensial Default Aplikasi. Untuk mengetahui informasi selengkapnya, baca Menyiapkan autentikasi untuk lingkungan pengembangan lokal.

import (
	"context"
	"fmt"
	"io"
	"sync/atomic"
	"time"

	"cloud.google.com/go/pubsub"
	texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
	"google.golang.org/api/option"
)

func subscribeOpenTelemetryTracing(w io.Writer, projectID, subID string, sampleRate float64) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	// sampleRate := "1.0"
	ctx := context.Background()

	exporter, err := texporter.New(texporter.WithProjectID(projectID),
		// Disable spans created by the exporter.
		texporter.WithTraceClientOptions(
			[]option.ClientOption{option.WithTelemetryDisabled()},
		),
	)
	if err != nil {
		return fmt.Errorf("error instantiating exporter: %w", err)
	}

	resources := resource.NewWithAttributes(
		semconv.SchemaURL,
		semconv.ServiceNameKey.String("subscriber"),
	)

	// Instantiate a tracer provider with the following settings
	tp := sdktrace.NewTracerProvider(
		sdktrace.WithBatcher(exporter),
		sdktrace.WithResource(resources),
		sdktrace.WithSampler(
			sdktrace.ParentBased(sdktrace.TraceIDRatioBased(sampleRate)),
		),
	)

	defer tp.ForceFlush(ctx) // flushes any pending spans
	otel.SetTracerProvider(tp)

	// Create a new client with tracing enabled.
	client, err := pubsub.NewClientWithConfig(ctx, projectID, &pubsub.ClientConfig{
		EnableOpenTelemetryTracing: true,
	})
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	sub := client.Subscription(subID)

	// Receive messages for 10 seconds, which simplifies testing.
	// Comment this out in production, since `Receive` should
	// be used as a long running operation.
	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()

	var received int32
	err = sub.Receive(ctx, func(_ context.Context, msg *pubsub.Message) {
		fmt.Fprintf(w, "Got message: %q\n", string(msg.Data))
		atomic.AddInt32(&received, 1)
		msg.Ack()
	})
	if err != nil {
		return fmt.Errorf("sub.Receive: %w", err)
	}
	fmt.Fprintf(w, "Received %d messages\n", received)

	return nil
}

Langkah selanjutnya

Untuk menelusuri dan memfilter contoh kode untuk produk Google Cloud lainnya, lihat Google Cloud browser contoh.