更改订阅类型

控制台

如需修改订阅，请完成以下步骤。

1. 在 Trusted Cloud 控制台中，前往订阅页面。

   前往“订阅”页面

2. 点击要更新的订阅旁边的 more_vert。
3. 在传送类型中，选择传送选项。
4. 根据需要填写其他订阅属性。
5. 点击更新。

gcloud

1. In the Trusted Cloud console, activate Cloud Shell.

   Activate Cloud Shell

   At the bottom of the Trusted Cloud console, a Cloud Shell session starts and displays a command-line prompt. Cloud Shell is a shell environment with the Google Cloud CLI already installed and with values already set for your current project. It can take a few seconds for the session to initialize.

2. 要修改推送端点网址，请运行 gcloud pubsub subscriptions modify-push-config 命令：

   gcloud pubsub subscriptions modify-push-config SUBSCRIPTION_ID \
     --push-endpoint=PUSH_ENDPOINT

   如果订阅已使用拉取传送，则设置推送端点会将传送方式切换为推送传送。

   您可以通过将推送端点更改为空字符串来将推送切换为拉取。

REST

如需修改订阅的推送配置，请使用 projects.subscriptions.modifyPushConfig 方法：

请求：

必须使用 Authorization 标头中的访问令牌对请求进行身份验证。如需获取当前应用默认凭据的访问令牌，请运行以下命令：gcloud auth application-default print-access-token。

POST https://pubsub.googleapis.com/v1/projects/PROJECT_ID/subscriptions/SUBSCRIPTION_ID:modifyPushConfig
Authorization: Bearer ACCESS_TOKEN
  

请求正文：

{
"pushConfig": {
  "pushEndpoint": "PUSH_ENDPOINT"
}
}

其中：

PROJECT_ID 是项目 ID。

SUBSCRIPTION_ID 是您的订阅 ID。

PUSH_ENDPOINT 是您要用作新推送端点的修改后的网址。例如 https://myproject.appspot.com/myhandler。

回答：

如果请求成功，响应将为空的 JSON 对象。

C++

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

namespace pubsub_admin = ::google::cloud::pubsub_admin;
namespace pubsub = ::google::cloud::pubsub;
[](pubsub_admin::SubscriptionAdminClient client,
   std::string const& project_id, std::string const& subscription_id,
   std::string const& endpoint) {
  google::pubsub::v1::ModifyPushConfigRequest request;
  request.set_subscription(
      pubsub::Subscription(project_id, subscription_id).FullName());
  request.mutable_push_config()->set_push_endpoint(endpoint);
  auto status = client.ModifyPushConfig(request);
  if (!status.ok()) throw std::runtime_error(status.message());

  std::cout << "The subscription push configuration was successfully"
            << " modified\n";
}

C#

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

using Google.Cloud.PubSub.V1;

public class UpdatePushConfigurationSample
{
    public void UpdatePushConfiguration(string projectId, string subscriptionId, string pushEndpoint)
    {
        SubscriberServiceApiClient subscriber = SubscriberServiceApiClient.Create();
        SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);

        PushConfig pushConfig = new PushConfig { PushEndpoint = pushEndpoint };

        subscriber.ModifyPushConfig(subscriptionName, pushConfig);
    }
}

Go

以下示例使用 Go Pub/Sub 客户端库的主要版本 (v2)。如果您仍在使用 v1 库，请参阅迁移到 v2 的指南。如需查看 v1 代码示例的列表，请参阅 已弃用的代码示例。

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub/v2"
	"cloud.google.com/go/pubsub/v2/apiv1/pubsubpb"
	"google.golang.org/protobuf/types/known/fieldmaskpb"
)

func updateEndpoint(w io.Writer, projectID, subscriptionName, endpoint string) error {
	// projectID := "my-project-id"
	// subscriptionName := "projects/my-project/subscriptions/my-sub"
	// 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: %w", err)
	}
	defer client.Close()

	req := &pubsubpb.UpdateSubscriptionRequest{
		Subscription: &pubsubpb.Subscription{
			Name: subscriptionName,
			PushConfig: &pubsubpb.PushConfig{
				PushEndpoint: endpoint,
			},
		},
		UpdateMask: &fieldmaskpb.FieldMask{
			Paths: []string{"push_config"},
		},
	}
	subConfig, err := client.SubscriptionAdminClient.UpdateSubscription(ctx, req)
	if err != nil {
		return fmt.Errorf("Update: %w", err)
	}
	fmt.Fprintf(w, "Updated subscription config: %v\n", subConfig)
	return nil
}

Java

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

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 java.io.IOException;

public class UpdatePushConfigurationExample {
  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 pushEndpoint = "https://my-test-project.appspot.com/push";

    updatePushConfigurationExample(projectId, subscriptionId, pushEndpoint);
  }

  public static void updatePushConfigurationExample(
      String projectId, String subscriptionId, String pushEndpoint) throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      SubscriptionName subscriptionName = SubscriptionName.of(projectId, subscriptionId);
      PushConfig pushConfig = PushConfig.newBuilder().setPushEndpoint(pushEndpoint).build();
      subscriptionAdminClient.modifyPushConfig(subscriptionName, pushConfig);
      Subscription subscription = subscriptionAdminClient.getSubscription(subscriptionName);
      System.out.println(
          "Updated push endpoint to: " + subscription.getPushConfig().getPushEndpoint());
    }
  }
}

Node.js

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

/**
 * 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 modifyPushConfig(topicNameOrId, subscriptionNameOrId) {
  const options = {
    // 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)
    .subscription(subscriptionNameOrId)
    .modifyPushConfig(options);
  console.log(`Modified push config for subscription ${subscriptionNameOrId}.`);
}

Node.ts

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

/**
 * 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 modifyPushConfig(
  topicNameOrId: string,
  subscriptionNameOrId: string,
) {
  const options: CreateSubscriptionOptions = {
    // 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)
    .subscription(subscriptionNameOrId)
    .modifyPushConfig(options);
  console.log(`Modified push config for subscription ${subscriptionNameOrId}.`);
}

Python

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

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"

subscriber = pubsub_v1.SubscriberClient()
subscription_path = subscriber.subscription_path(project_id, subscription_id)

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

subscription = pubsub_v1.types.Subscription(
    name=subscription_path, topic=topic_id, push_config=push_config
)

update_mask = {"paths": {"push_config"}}

# Wrap the subscriber in a 'with' block to automatically call close() to
# close the underlying gRPC channel when done.
with subscriber:
    result = subscriber.update_subscription(
        request={"subscription": subscription, "update_mask": update_mask}
    )

print(f"Subscription updated: {subscription_path}")
print(f"New endpoint for subscription is: {result.push_config}.")

Ruby

以下示例使用 Ruby Pub/Sub 客户端库 v3。如果您仍在使用 v2 库，请参阅 迁移到 v3 的指南。如需查看 Ruby v2 代码示例的列表，请参阅 已弃用的代码示例。

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

# subscription_id   = "your-subscription-id"
# new_endpoint      = "Endpoint where your app receives messages""

pubsub = Google::Cloud::PubSub.new
subscription_admin = pubsub.subscription_admin

subscription = subscription_admin.get_subscription \
  subscription: pubsub.subscription_path(subscription_id)
subscription.push_config = Google::Cloud::PubSub::V1::PushConfig.new \
  push_endpoint: new_endpoint

subscription_admin.update_subscription subscription: subscription,
                                       update_mask: {
                                         paths: ["push_config"]
                                       }

puts "Push endpoint updated."