创建推送订阅

使用推送端点创建推送订阅。

深入探索

如需查看包含此代码示例的详细文档，请参阅以下内容：

• 创建和使用订阅

代码示例

C++

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 C++ 设置说明进行操作。如需了解详情，请参阅 Pub/Sub C++ API 参考文档。

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namespace pubsub = ::google::cloud::pubsub;
[](pubsub::SubscriptionAdminClient client, std::string const& project_id,
   std::string const& topic_id, std::string const& subscription_id,
   std::string const& endpoint) {
  auto sub = client.CreateSubscription(
      pubsub::Topic(project_id, std::move(topic_id)),
      pubsub::Subscription(project_id, std::move(subscription_id)),
      pubsub::SubscriptionBuilder{}.set_push_config(
          pubsub::PushConfigBuilder{}.set_push_endpoint(endpoint)));
  if (sub.status().code() == google::cloud::StatusCode::kAlreadyExists) {
    std::cout << "The subscription already exists\n";
    return;
  }
  if (!sub) throw std::move(sub).status();

  std::cout << "The subscription was successfully created: "
            << sub->DebugString() << "\n";
}

C#

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 C# 设置说明进行操作。如需了解详情，请参阅 Pub/Sub C# API 参考文档。

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using Google.Cloud.PubSub.V1;

public class CreatePushSubscriptionSample
{
    public Subscription CreatePushSubscription(string projectId, string topicId, string subscriptionId, string pushEndpoint)
    {
        SubscriberServiceApiClient subscriber = SubscriberServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);

        PushConfig pushConfig = new PushConfig { PushEndpoint = pushEndpoint };

        // The approximate amount of time in seconds (on a best-effort basis) Pub/Sub waits for the
        // subscriber to acknowledge receipt before resending the message.
        var ackDeadlineSeconds = 60;
        var subscription = subscriber.CreateSubscription(subscriptionName, topicName, pushConfig, ackDeadlineSeconds);
        return subscription;
    }
}

Go

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Go 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Go API 参考文档。

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import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/pubsub"
)

func createWithEndpoint(w io.Writer, projectID, subID string, topic *pubsub.Topic, endpoint string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	// topic of type https://godoc.org/cloud.google.com/go/pubsub#Topic
	// endpoint := "https://my-test-project.appspot.com/push"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %v", err)
	}
	defer client.Close()

	sub, err := client.CreateSubscription(ctx, subID, pubsub.SubscriptionConfig{
		Topic:       topic,
		AckDeadline: 10 * time.Second,
		PushConfig:  pubsub.PushConfig{Endpoint: endpoint},
	})
	if err != nil {
		return fmt.Errorf("CreateSubscription: %v", err)
	}
	fmt.Fprintf(w, "Created subscription: %v\n", sub)
	return nil
}

Java

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Java 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Java API 参考文档。

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import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.pubsub.v1.PushConfig;
import com.google.pubsub.v1.Subscription;
import com.google.pubsub.v1.SubscriptionName;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class CreatePushSubscriptionExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String subscriptionId = "your-subscription-id";
    String topicId = "your-topic-id";
    String pushEndpoint = "https://my-test-project.appspot.com/push";

    createPushSubscriptionExample(projectId, subscriptionId, topicId, pushEndpoint);
  }

  public static void createPushSubscriptionExample(
      String projectId, String subscriptionId, String topicId, String pushEndpoint)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      SubscriptionName subscriptionName = SubscriptionName.of(projectId, subscriptionId);
      PushConfig pushConfig = PushConfig.newBuilder().setPushEndpoint(pushEndpoint).build();

      // Create a push subscription with default acknowledgement deadline of 10 seconds.
      // Messages not successfully acknowledged within 10 seconds will get resent by the server.
      Subscription subscription =
          subscriptionAdminClient.createSubscription(subscriptionName, topicName, pushConfig, 10);
      System.out.println("Created push subscription: " + subscription.getName());
    }
  }
}

Node.js

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/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createPushSubscription(topicNameOrId, subscriptionNameOrId) {
  const options = {
    pushConfig: {
      // Set to an HTTPS endpoint of your choice. If necessary, register
      // (authorize) the domain on which the server is hosted.
      pushEndpoint: `https://${pubSubClient.projectId}.appspot.com/push`,
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);
  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

Node.js

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/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createPushSubscription(
  topicNameOrId: string,
  subscriptionNameOrId: string
) {
  const options: CreateSubscriptionOptions = {
    pushConfig: {
      // Set to an HTTPS endpoint of your choice. If necessary, register
      // (authorize) the domain on which the server is hosted.
      pushEndpoint: `https://${pubSubClient.projectId}.appspot.com/push`,
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);
  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

PHP

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 PHP 设置说明进行操作。如需了解详情，请参阅 Pub/Sub PHP API 参考文档。

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use Google\Cloud\PubSub\PubSubClient;

/**
 * Creates a Pub/Sub push subscription.
 *
 * @param string $projectId  The Google project ID.
 * @param string $topicName  The Pub/Sub topic name.
 * @param string $subscriptionName  The Pub/Sub subscription name.
 * @param string $endpoint  The endpoint for the push subscription.
 */
function create_push_subscription($projectId, $topicName, $subscriptionName, $endpoint)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    $topic = $pubsub->topic($topicName);
    $subscription = $topic->subscription($subscriptionName);
    $subscription->create([
        'pushConfig' => ['pushEndpoint' => $endpoint]
    ]);

    printf('Subscription created: %s' . PHP_EOL, $subscription->name());
}

Python

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Python 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Python API 参考文档。

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from google.cloud import pubsub_v1

# TODO(developer)
# project_id = "your-project-id"
# topic_id = "your-topic-id"
# subscription_id = "your-subscription-id"
# endpoint = "https://my-test-project.appspot.com/push"

publisher = pubsub_v1.PublisherClient()
subscriber = pubsub_v1.SubscriberClient()
topic_path = publisher.topic_path(project_id, topic_id)
subscription_path = subscriber.subscription_path(project_id, subscription_id)

push_config = pubsub_v1.types.PushConfig(push_endpoint=endpoint)

# Wrap the subscriber in a 'with' block to automatically call close() to
# close the underlying gRPC channel when done.
with subscriber:
    subscription = subscriber.create_subscription(
        request={
            "name": subscription_path,
            "topic": topic_path,
            "push_config": push_config,
        }
    )

print(f"Push subscription created: {subscription}.")
print(f"Endpoint for subscription is: {endpoint}")

Ruby

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Ruby 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Ruby API 参考文档。

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# topic_id          = "your-topic-id"
# subscription_id   = "your-subscription-id"
# endpoint          = "https://your-test-project.appspot.com/push"
require "google/cloud/pubsub"

pubsub = Google::Cloud::Pubsub.new

topic        = pubsub.topic topic_id
subscription = topic.subscribe subscription_id,
                               endpoint: endpoint

puts "Push subscription #{subscription_id} created."

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。