Cette page a été traduite par l'API Cloud Translation.

Créer un sujet Lite

Créez un sujet Lite à partition unique et configurez sa période de conservation, le stockage par partition et le facteur de scaling du débit de publication.

En savoir plus

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

Créer et gérer des sujets Lite

Exemple de code

Go

Pour vous authentifier auprès de Pub/Sub Lite, configurez le service 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/pubsublite"
)

func createTopic(w io.Writer, projectID, region, location, topicID, reservation string) error {
	// projectID := "my-project-id"
	// region := "us-central1" // see https://cloud.google.com/pubsub/lite/docs/locations
	// NOTE: location can be either a region ("us-central1") or a zone ("us-central1-a")
	// For a list of valid locations, see https://cloud.google.com/pubsub/lite/docs/locations.
	// location := "us-central1"
	// topicID := "my-topic"
	// reservation := "projects/my-project-id/reservations/my-reservation"
	ctx := context.Background()
	client, err := pubsublite.NewAdminClient(ctx, region)
	if err != nil {
		return fmt.Errorf("pubsublite.NewAdminClient: %w", err)
	}
	defer client.Close()

	const gib = 1 << 30

	topicPath := fmt.Sprintf("projects/%s/locations/%s/topics/%s", projectID, location, topicID)
	// For ranges of fields in TopicConfig, see https://pkg.go.dev/cloud.google.com/go/pubsublite/#TopicConfig
	topic, err := client.CreateTopic(ctx, pubsublite.TopicConfig{
		Name:                       topicPath,
		PartitionCount:             2, // Must be >= 1 and cannot decrease after creation.
		PublishCapacityMiBPerSec:   4,
		SubscribeCapacityMiBPerSec: 8,
		PerPartitionBytes:          30 * gib,
		RetentionDuration:          pubsublite.InfiniteRetention,
		ThroughputReservation:      reservation,
	})
	if err != nil {
		return fmt.Errorf("client.CreateTopic got err: %w", err)
	}
	fmt.Fprintf(w, "Created topic: %#v\n", topic)
	return nil
}

Java

import com.google.api.gax.rpc.AlreadyExistsException;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.CloudRegion;
import com.google.cloud.pubsublite.CloudRegionOrZone;
import com.google.cloud.pubsublite.CloudZone;
import com.google.cloud.pubsublite.ProjectNumber;
import com.google.cloud.pubsublite.ReservationName;
import com.google.cloud.pubsublite.ReservationPath;
import com.google.cloud.pubsublite.TopicName;
import com.google.cloud.pubsublite.TopicPath;
import com.google.cloud.pubsublite.proto.Topic;
import com.google.cloud.pubsublite.proto.Topic.PartitionConfig;
import com.google.cloud.pubsublite.proto.Topic.PartitionConfig.Capacity;
import com.google.cloud.pubsublite.proto.Topic.ReservationConfig;
import com.google.cloud.pubsublite.proto.Topic.RetentionConfig;
import com.google.protobuf.util.Durations;
import java.util.concurrent.ExecutionException;

public class CreateTopicExample {

  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String cloudRegion = "your-cloud-region";
    char zoneId = 'a';
    String topicId = "your-topic-id";
    String reservationId = "your-reservation-id";
    long projectNumber = Long.parseLong("123456789");
    int partitions = 1;
    // True if using a regional location. False if using a zonal location.
    // https://cloud.google.com/pubsub/lite/docs/topics
    boolean regional = false;

    createTopicExample(
        cloudRegion, zoneId, projectNumber, topicId, reservationId, partitions, regional);
  }

  public static void createTopicExample(
      String cloudRegion,
      char zoneId,
      long projectNumber,
      String topicId,
      String reservationId,
      int partitions,
      boolean regional)
      throws Exception {

    ReservationPath reservationPath =
        ReservationPath.newBuilder()
            .setProject(ProjectNumber.of(projectNumber))
            .setLocation(CloudRegion.of(cloudRegion))
            .setName(ReservationName.of(reservationId))
            .build();

    CloudRegionOrZone location;
    if (regional) {
      location = CloudRegionOrZone.of(CloudRegion.of(cloudRegion));
    } else {
      location = CloudRegionOrZone.of(CloudZone.of(CloudRegion.of(cloudRegion), zoneId));
    }

    TopicPath topicPath =
        TopicPath.newBuilder()
            .setProject(ProjectNumber.of(projectNumber))
            .setLocation(location)
            .setName(TopicName.of(topicId))
            .build();

    Topic topic =
        Topic.newBuilder()
            .setPartitionConfig(
                PartitionConfig.newBuilder()
                    // Set throughput capacity per partition in MiB/s.
                    .setCapacity(
                        Capacity.newBuilder()
                            // Must be 4-16 MiB/s.
                            .setPublishMibPerSec(4)
                            // Must be 4-32 MiB/s.
                            .setSubscribeMibPerSec(8)
                            .build())
                    .setCount(partitions))
            .setRetentionConfig(
                RetentionConfig.newBuilder()
                    // How long messages are retained.
                    .setPeriod(Durations.fromDays(1))
                    // Set storage per partition to 30 GiB. This must be 30 GiB-10 TiB.
                    // If the number of bytes stored in any of the topic's partitions grows
                    // beyond this value, older messages will be dropped to make room for
                    // newer ones, regardless of the value of `period`.
                    .setPerPartitionBytes(30 * 1024 * 1024 * 1024L))
            .setReservationConfig(
                ReservationConfig.newBuilder()
                    .setThroughputReservation(reservationPath.toString())
                    .build())
            .setName(topicPath.toString())
            .build();

    AdminClientSettings adminClientSettings =
        AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();

    try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
      Topic response = adminClient.createTopic(topic).get();
      if (regional) {
        System.out.println(response.getAllFields() + " (regional topic) created successfully.");
      } else {
        System.out.println(response.getAllFields() + " (zonal topic) created successfully.");
      }
    } catch (ExecutionException e) {
      try {
        throw e.getCause();
      } catch (AlreadyExistsException alreadyExists) {
        System.out.println("This topic already exists.");
      } catch (Throwable throwable) {
        throwable.printStackTrace();
      }
    }
  }
}

Python

from google.api_core.exceptions import AlreadyExists
from google.cloud.pubsublite import AdminClient, Topic
from google.cloud.pubsublite.types import (
    CloudRegion,
    CloudZone,
    ReservationPath,
    TopicPath,
)
from google.protobuf.duration_pb2 import Duration

# TODO(developer):
# project_number = 1122334455
# cloud_region = "us-central1"
# zone_id = "a"
# topic_id = "your-topic-id"
# reservation_id = "your-reservation-id"
# num_partitions = 1
# regional = True

cloud_region = CloudRegion(cloud_region)
reservation_path = ReservationPath(project_number, cloud_region, reservation_id)

topic_path = None
if regional:
    #  A regional topic.
    topic_path = TopicPath(project_number, cloud_region, topic_id)
else:
    #  A zonal topic
    topic_path = TopicPath(
        project_number, CloudZone(cloud_region, zone_id), topic_id
    )

topic = Topic(
    name=str(topic_path),
    partition_config=Topic.PartitionConfig(
        # A topic must have at least one partition.
        count=num_partitions,
        # Set throughput capacity per partition in MiB/s.
        capacity=Topic.PartitionConfig.Capacity(
            # Set publish throughput capacity per partition to 4 MiB/s. Must be >= 4 and <= 16.
            publish_mib_per_sec=4,
            # Set subscribe throughput capacity per partition to 4 MiB/s. Must be >= 4 and <= 32.
            subscribe_mib_per_sec=8,
        ),
    ),
    retention_config=Topic.RetentionConfig(
        # Set storage per partition to 30 GiB. This must be in the range 30 GiB-10TiB.
        # If the number of byptes stored in any of the topic's partitions grows beyond
        # this value, older messages will be dropped to make room for newer ones,
        # regardless of the value of `period`.
        per_partition_bytes=30 * 1024 * 1024 * 1024,
        # Allow messages to be retained for 7 days.
        period=Duration(seconds=60 * 60 * 24 * 7),
    ),
    reservation_config=Topic.ReservationConfig(
        throughput_reservation=str(reservation_path),
    ),
)

client = AdminClient(cloud_region)
try:
    response = client.create_topic(topic)
    if regional:
        print(f"{response.name} (regional topic) created successfully.")
    else:
        print(f"{response.name} (zonal topic) created successfully.")
except AlreadyExists:
    print(f"{topic_path} already exists.")

Étapes suivantes

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