Publier un message avec le traçage OpenTelemetry activé

Publiez un message avec le traçage OpenTelemetry activé tout en utilisant un exportateur Cloud Trace et un taux d'échantillonnage de 100%.

En savoir plus

Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :

Exemple de code

C++

Avant d'essayer cet exemple, suivez les instructions de configuration de C++ dans le Guide de démarrage rapide de Pub/Sub bibliothèques clientes. Pour en savoir plus, consultez les API C++ Pub/Sub documentation de référence.

Pour vous authentifier auprès de Pub/Sub, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

// Create a few namespace aliases to make the code easier to read.
namespace gc = ::google::cloud;
namespace otel = gc::otel;
namespace pubsub = gc::pubsub;

// This example uses a simple wrapper to export (upload) OTel tracing data
// to Google Cloud Trace. More complex applications may use different
// authentication, or configure their own OTel exporter.
auto project = gc::Project(project_id);
auto configuration = otel::ConfigureBasicTracing(project);

auto publisher = pubsub::Publisher(pubsub::MakePublisherConnection(
    pubsub::Topic(project_id, topic_id),
    // Configure this publisher to enable OTel tracing. Some applications may
    // chose to disable tracing in some publishers or to dynamically enable
    // this option based on their own configuration.
    gc::Options{}.set<gc::OpenTelemetryTracingOption>(true)));

// After this point, use the Cloud Pub/Sub C++ client library as usual.
// In this example, we will send a few messages and configure a callback
// action for each one.
std::vector<gc::future<void>> ids;
for (int i = 0; i < 5; i++) {
  auto id = publisher.Publish(pubsub::MessageBuilder().SetData("Hi!").Build())
                .then([](gc::future<gc::StatusOr<std::string>> f) {
                  auto id = f.get();
                  if (!id) {
                    std::cout << "Error in publish: " << id.status() << "\n";
                    return;
                  }
                  std::cout << "Sent message with id: (" << *id << ")\n";
                });
  ids.push_back(std::move(id));
}
// Block until the messages are actually sent.
for (auto& id : ids) id.get();

Go

Avant d'essayer cet exemple, suivez les instructions de configuration de Go dans le Guide de démarrage rapide de Pub/Sub bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence sur l'API Pub/Sub Go.

Pour vous authentifier auprès de Pub/Sub, configurez les identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub"
	"go.opentelemetry.io/otel"
	"google.golang.org/api/option"

	texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
)

// publishOpenTelemetryTracing publishes a single message with OpenTelemetry tracing
// enabled, exporting to Cloud Trace.
func publishOpenTelemetryTracing(w io.Writer, projectID, topicID string, sampling float64) error {
	// projectID := "my-project-id"
	// topicID := "my-topic"
	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("publisher"),
	)

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

	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()

	t := client.Topic(topicID)
	result := t.Publish(ctx, &pubsub.Message{
		Data: []byte("Publishing message with tracing"),
	})
	if _, err := result.Get(ctx); err != nil {
		return fmt.Errorf("pubsub: result.Get: %w", err)
	}
	fmt.Fprintln(w, "Published a traced message")
	return nil
}

Java

Avant d'essayer cet exemple, suivez les instructions de configuration de Java dans le Guide de démarrage rapide de Pub/Sub bibliothèques clientes. Pour en savoir plus, consultez la documentation de référence sur l'API Pub/Sub Java.

Pour vous authentifier auprès de Pub/Sub, configurez les identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.


import com.google.api.core.ApiFuture;
import com.google.cloud.opentelemetry.trace.TraceConfiguration;
import com.google.cloud.opentelemetry.trace.TraceExporter;
import com.google.cloud.pubsub.v1.Publisher;
import com.google.protobuf.ByteString;
import com.google.pubsub.v1.PubsubMessage;
import com.google.pubsub.v1.TopicName;
import io.opentelemetry.api.OpenTelemetry;
import io.opentelemetry.sdk.OpenTelemetrySdk;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.trace.SdkTracerProvider;
import io.opentelemetry.sdk.trace.export.SimpleSpanProcessor;
import io.opentelemetry.sdk.trace.export.SpanExporter;
import io.opentelemetry.sdk.trace.samplers.Sampler;
import io.opentelemetry.semconv.ResourceAttributes;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

public class OpenTelemetryPublisherExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String topicId = "your-topic-id";

    openTelemetryPublisherExample(projectId, topicId);
  }

  public static void openTelemetryPublisherExample(String projectId, String topicId)
      throws IOException, ExecutionException, InterruptedException {
    Resource resource =
        Resource.getDefault().toBuilder()
            .put(ResourceAttributes.SERVICE_NAME, "publisher-example")
            .build();

    // Creates a Cloud Trace exporter.
    SpanExporter traceExporter =
        TraceExporter.createWithConfiguration(
            TraceConfiguration.builder().setProjectId(projectId).build());

    SdkTracerProvider sdkTracerProvider =
        SdkTracerProvider.builder()
            .setResource(resource)
            .addSpanProcessor(SimpleSpanProcessor.create(traceExporter))
            .setSampler(Sampler.alwaysOn())
            .build();

    OpenTelemetry openTelemetry =
        OpenTelemetrySdk.builder().setTracerProvider(sdkTracerProvider).buildAndRegisterGlobal();

    TopicName topicName = TopicName.of(projectId, topicId);

    Publisher publisher = null;
    try {
      // Create a publisher instance with the created OpenTelemetry object and enabling tracing.
      publisher =
          Publisher.newBuilder(topicName)
              .setOpenTelemetry(openTelemetry)
              .setEnableOpenTelemetryTracing(true)
              .build();

      String message = "Hello World!";
      ByteString data = ByteString.copyFromUtf8(message);
      PubsubMessage pubsubMessage = PubsubMessage.newBuilder().setData(data).build();

      // Once published, returns a server-assigned message id (unique within the topic)
      ApiFuture<String> messageIdFuture = publisher.publish(pubsubMessage);
      String messageId = messageIdFuture.get();
      System.out.println("Published message ID: " + messageId);
    } finally {
      if (publisher != null) {
        // When finished with the publisher, shutdown to free up resources.
        publisher.shutdown();
        publisher.awaitTermination(1, TimeUnit.MINUTES);
      }
    }
  }
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_OR_ID';
// const data = 'Hello, world!";

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

// Imports the OpenTelemetry API
const {NodeTracerProvider} = require('@opentelemetry/sdk-trace-node');
const {diag, DiagConsoleLogger, DiagLogLevel} = require('@opentelemetry/api');
const {SimpleSpanProcessor} = require('@opentelemetry/sdk-trace-base');

// To output to the console for testing, use the ConsoleSpanExporter.
// import {ConsoleSpanExporter} from '@opentelemetry/sdk-trace-base';

// To output to Cloud Trace, import the OpenTelemetry bridge library.
const {
  TraceExporter,
} = require('@google-cloud/opentelemetry-cloud-trace-exporter');

const {Resource} = require('@opentelemetry/resources');
const {
  SEMRESATTRS_SERVICE_NAME,
} = require('@opentelemetry/semantic-conventions');

// Enable the diagnostic logger for OpenTelemetry
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG);

// Log spans out to the console, for testing.
// const exporter = new ConsoleSpanExporter();

// Log spans out to Cloud Trace, for production.
const exporter = new TraceExporter();

// Build a tracer provider and a span processor to do
// something with the spans we're generating.
const provider = new NodeTracerProvider({
  resource: new Resource({
    [SEMRESATTRS_SERVICE_NAME]: 'otel publisher example',
  }),
});
const processor = new SimpleSpanProcessor(exporter);
provider.addSpanProcessor(processor);
provider.register();

// Creates a client; cache this for further use.
const pubSubClient = new PubSub({enableOpenTelemetryTracing: true});

async function publishMessage(topicNameOrId, data) {
  // Publishes the message as a string, e.g. "Hello, world!"
  // or JSON.stringify(someObject)
  const dataBuffer = Buffer.from(data);
  const publisher = pubSubClient.topic(topicNameOrId);
  const messageId = await publisher.publishMessage({data: dataBuffer});
  console.log(`Message ${messageId} published.`);

  // The rest of the sample is in service to making sure that any
  // buffered Pub/Sub messages and/or OpenTelemetry spans are properly
  // flushed to the server side. In normal usage, you'd only need to do
  // something like this on process shutdown.
  await publisher.flush();
  await processor.forceFlush();
  await new Promise(r => setTimeout(r, OTEL_TIMEOUT * 1000));
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_OR_ID';
// const data = 'Hello, world!";

// Imports the Google Cloud client library
import {PubSub} from '@google-cloud/pubsub';

// Imports the OpenTelemetry API
import {NodeTracerProvider} from '@opentelemetry/sdk-trace-node';
import {diag, DiagConsoleLogger, DiagLogLevel} from '@opentelemetry/api';
import {SimpleSpanProcessor} from '@opentelemetry/sdk-trace-base';

// To output to the console for testing, use the ConsoleSpanExporter.
// import {ConsoleSpanExporter} from '@opentelemetry/sdk-trace-base';

// To output to Cloud Trace, import the OpenTelemetry bridge library.
import {TraceExporter} from '@google-cloud/opentelemetry-cloud-trace-exporter';

import {Resource} from '@opentelemetry/resources';
import {SEMRESATTRS_SERVICE_NAME} from '@opentelemetry/semantic-conventions';

// Enable the diagnostic logger for OpenTelemetry
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG);

// Log spans out to the console, for testing.
// const exporter = new ConsoleSpanExporter();

// Log spans out to Cloud Trace, for production.
const exporter = new TraceExporter();

// Build a tracer provider and a span processor to do
// something with the spans we're generating.
const provider = new NodeTracerProvider({
  resource: new Resource({
    [SEMRESATTRS_SERVICE_NAME]: 'otel publisher example',
  }),
});
const processor = new SimpleSpanProcessor(exporter);
provider.addSpanProcessor(processor);
provider.register();

// Creates a client; cache this for further use.
const pubSubClient = new PubSub({enableOpenTelemetryTracing: true});

async function publishMessage(topicNameOrId: string, data: string) {
  // Publishes the message as a string, e.g. "Hello, world!"
  // or JSON.stringify(someObject)
  const dataBuffer = Buffer.from(data);
  const publisher = pubSubClient.topic(topicNameOrId);
  const messageId = await publisher.publishMessage({data: dataBuffer});
  console.log(`Message ${messageId} published.`);

  // The rest of the sample is in service to making sure that any
  // buffered Pub/Sub messages and/or OpenTelemetry spans are properly
  // flushed to the server side. In normal usage, you'd only need to do
  // something like this on process shutdown.
  await publisher.flush();
  await processor.forceFlush();
  await new Promise(r => setTimeout(r, OTEL_TIMEOUT * 1000));
}

Python

Avant d'essayer cet exemple, suivez les instructions de configuration de Python dans le Guide de démarrage rapide de Pub/Sub bibliothèques clientes. Pour en savoir plus, consultez les API Python Pub/Sub documentation de référence.

Pour vous authentifier auprès de Pub/Sub, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.


from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import (
    BatchSpanProcessor,
)
from opentelemetry.exporter.cloud_trace import CloudTraceSpanExporter
from opentelemetry.sdk.trace.sampling import TraceIdRatioBased, ParentBased

from google.cloud.pubsub_v1 import PublisherClient
from google.cloud.pubsub_v1.types import PublisherOptions

# TODO(developer)
# topic_project_id = "your-topic-project-id"
# trace_project_id = "your-trace-project-id"
# topic_id = "your-topic-id"

# In this sample, we use a Google Cloud Trace to export the OpenTelemetry
# traces: https://cloud.google.com/trace/docs/setup/python-ot
# Choose and configure the exporter for your set up accordingly.

sampler = ParentBased(root=TraceIdRatioBased(1))
trace.set_tracer_provider(TracerProvider(sampler=sampler))

# Export to Google Trace.
cloud_trace_exporter = CloudTraceSpanExporter(
    project_id=trace_project_id,
)
trace.get_tracer_provider().add_span_processor(
    BatchSpanProcessor(cloud_trace_exporter)
)

# Set the `enable_open_telemetry_tracing` option to True when creating
# the publisher client. This in itself is necessary and sufficient for
# the library to export OpenTelemetry traces. However, where the traces
# must be exported to needs to be configured based on your OpenTelemetry
# set up. Refer: https://opentelemetry.io/docs/languages/python/exporters/
publisher = PublisherClient(
    publisher_options=PublisherOptions(
        enable_open_telemetry_tracing=True,
    ),
)

# The `topic_path` method creates a fully qualified identifier
# in the form `projects/{project_id}/topics/{topic_id}`
topic_path = publisher.topic_path(topic_project_id, topic_id)
# Publish messages.
for n in range(1, 10):
    data_str = f"Message number {n}"
    # Data must be a bytestring
    data = data_str.encode("utf-8")
    # When you publish a message, the client returns a future.
    future = publisher.publish(topic_path, data)
    print(future.result())

print(f"Published messages to {topic_path}.")

Étapes suivantes

Pour rechercher et filtrer des exemples de code pour d'autres produits Google Cloud, consultez l'explorateur d'exemples Google Cloud.