本页面上的部分或全部信息可能不适用于 Trusted Cloud by S3NS。如需了解详情，请参阅与 Google Cloud 的区别。

此页面由 Cloud Translation API 翻译。

列出订阅

您可以使用Trusted Cloud 控制台、Google Cloud CLI、客户端库或 Pub/Sub API 列出 Trusted Cloud 项目中的订阅。

准备工作

了解订阅。
创建以下订阅之一：拉取订阅、推送订阅或 BigQuery。

所需的角色和权限

如需获得列出和管理订阅所需的权限，请让您的管理员为您授予主题或项目的 Pub/Sub Editor (roles/pubsub.editor) IAM 角色。如需详细了解如何授予角色，请参阅管理对项目、文件夹和组织的访问权限。

此预定义角色包含列出订阅和管理订阅所需的权限。如需查看所需的确切权限，请展开所需权限部分：

所需权限

如需列出和管理订阅，您需要具备以下权限：

从订阅中拉取： pubsub.subscriptions.consume
创建订阅： pubsub.subscriptions.create
删除订阅： pubsub.subscriptions.delete
获取订阅： pubsub.subscriptions.get
列出订阅： pubsub.subscriptions.list
更新订阅： pubsub.subscriptions.update
将订阅附加到主题： pubsub.topics.attachSubscription
获取订阅的 IAM 政策： pubsub.subscriptions.getIamPolicy
为订阅配置 IAM 政策： pubsub.subscriptions.setIamPolicy

您也可以使用自定义角色或其他预定义角色来获取这些权限。

列出订阅

您可以使用Trusted Cloud 控制台、Google Cloud CLI、客户端库或 Pub/Sub API 列出 Trusted Cloud 项目中的订阅。

控制台

要列出项目中的订阅，请转到订阅页面。

前往“订阅”页面

您订阅的频道会列在该页面上的表格中。

gcloud

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.
如需列出 Trusted Cloud 项目中的订阅，请运行 gcloud pubsub subscriptions list 命令：
```
gcloud pubsub subscriptions list [--project=PROJECT_ID]
```

REST

如需列出项目中的订阅，请使用 projects.subscriptions.list 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。

GET https://pubsub.googleapis.com/v1/projects/PROJECT_ID/subscriptions
Authorization: Bearer ACCESS_TOKEN

其中：

PROJECT_ID 是项目 ID。

回答：

{
"subscriptions": [
{
  "name": "projects/PROJECT_ID/topics/mysubscription1",
  "topic": "projects/PROJECT_ID/topics/TOPIC_ID",
  "pushConfig": {},
  "ackDeadlineSeconds": 10,
  "retainAckedMessages": true,
  "messageRetentionDuration": "604800s",
  "expirationPolicy": {}
},
{
  "name": "projects/PROJECT_ID/topics/mysubscription2",
  "topic": "projects/PROJECT_ID/topics/TOPIC_ID",
  "pushConfig": {
    "pushEndpoint": "https://PROJECT_ID.appspot.com/myhandler",
    "attributes": {
      "x-goog-version": "v1"
    }
  },
  "ackDeadlineSeconds": 10,
  "retainAckedMessages": true,
  "messageRetentionDuration": "604800s",
  "expirationPolicy": {}
}
]
}

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;
[](pubsub_admin::SubscriptionAdminClient client,
   std::string const& project_id) {
  int count = 0;
  google::pubsub::v1::ListSubscriptionsRequest request;
  request.set_project(google::cloud::Project(project_id).FullName());
  for (auto& subscription : client.ListSubscriptions(request)) {
    if (!subscription) throw std::move(subscription).status();
    std::cout << "Subscription Name: " << subscription->name() << "\n";
    ++count;
  }
  if (count == 0) {
    std::cout << "No subscriptions found in project " << project_id << "\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.Api.Gax.ResourceNames;
using Google.Cloud.PubSub.V1;
using System.Collections.Generic;

public class ListSubscriptionsSample
{
    public IEnumerable<Subscription> ListSubscriptions(string projectId)
    {
        SubscriberServiceApiClient subscriber = SubscriberServiceApiClient.Create();
        ProjectName projectName = ProjectName.FromProject(projectId);
        var subscriptions = subscriber.ListSubscriptions(projectName);
        return subscriptions;
    }
}

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"

	"cloud.google.com/go/pubsub/v2"
	"cloud.google.com/go/pubsub/v2/apiv1/pubsubpb"
	"google.golang.org/api/iterator"
)

func list(projectID string) ([]*pubsubpb.Subscription, error) {
	// projectID := "my-project-id"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	var subs []*pubsubpb.Subscription
	req := &pubsubpb.ListSubscriptionsRequest{
		Project: fmt.Sprintf("projects/%s", projectID),
	}
	it := client.SubscriptionAdminClient.ListSubscriptions(ctx, req)
	for {
		s, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return nil, fmt.Errorf("Next: %w", err)
		}
		subs = append(subs, s)
	}
	return subs, 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.ProjectName;
import com.google.pubsub.v1.Subscription;
import java.io.IOException;

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

    listSubscriptionInProjectExample(projectId);
  }

  public static void listSubscriptionInProjectExample(String projectId) throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      ProjectName projectName = ProjectName.of(projectId);
      for (Subscription subscription :
          subscriptionAdminClient.listSubscriptions(projectName).iterateAll()) {
        System.out.println(subscription.getName());
      }
      System.out.println("Listed all the subscriptions in the project.");
    }
  }
}

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。

// 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 listSubscriptions() {
  // Lists all subscriptions in the current project
  const [subscriptions] = await pubSubClient.getSubscriptions();
  console.log('Subscriptions:');
  subscriptions.forEach(subscription => console.log(subscription.name));
}

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。

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

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

async function listSubscriptions() {
  // Lists all subscriptions in the current project
  const [subscriptions] = await pubSubClient.getSubscriptions();
  console.log('Subscriptions:');
  subscriptions.forEach((subscription: Subscription) =>
    console.log(subscription.name),
  );
}

PHP

在尝试此示例之前，请按照《快速入门：使用客户端库》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。

use Google\Cloud\PubSub\PubSubClient;

/**
 * Lists all Pub/Sub subscriptions.
 *
 * @param string $projectId  The Google project ID.
 */
function list_subscriptions($projectId)
{
    $pubsub = new PubSubClient([
        'projectId' => $projectId,
    ]);
    foreach ($pubsub->subscriptions() as $subscription) {
        printf('Subscription: %s' . PHP_EOL, $subscription->name());
    }
}

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"

subscriber = pubsub_v1.SubscriberClient()
project_path = f"projects/{project_id}"

# Wrap the subscriber in a 'with' block to automatically call close() to
# close the underlying gRPC channel when done.
with subscriber:
    for subscription in subscriber.list_subscriptions(
        request={"project": project_path}
    ):
        print(subscription.name)

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。


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

subscriptions = subscription_admin.list_subscriptions \
  project: pubsub.project_path

puts "Subscriptions:"
subscriptions.each do |subscription|
  puts subscription.name
end

列出主题的订阅

您可以使用 Trusted Cloud 控制台、Google Cloud CLI 或 Pub/Sub API 列出对主题的订阅。

控制台

在 Trusted Cloud 控制台中，前往主题页面。
转到“主题”
选择主题 ID 以打开主题详细信息页面。页面的订阅部分包含对主题的订阅列表。

gcloud

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.
如需列出 Trusted Cloud 项目中的订阅，请运行 gcloud pubsub topics list-subscriptions 命令：
```
gcloud pubsub topics list-subscriptions TOPIC_ID
```

REST

如需列出主题中的订阅，请使用 projects.subscriptions.list 方法：

请求：

GET https://pubsub.googleapis.com/v1/projects/PROJECT_ID/topics/TOPIC_ID/subscriptions
Authorization: Bearer ACCESS_TOKEN

其中：

PROJECT_ID 是项目 ID。
TOPIC_ID 是主题 ID。

回答：

{
"subscriptions": [
"projects/PROJECT_ID/subscriptions/mysubscription1",
"projects/PROJECT_ID/subscriptions/mysubscription2"
]
}

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::TopicAdminClient client, std::string const& project_id,
   std::string const& topic_id) {
  auto const topic = pubsub::Topic(project_id, topic_id);
  std::cout << "Subscription list for topic " << topic << ":\n";
  for (auto& name : client.ListTopicSubscriptions(topic.FullName())) {
    if (!name) throw std::move(name).status();
    std::cout << "  " << *name << "\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;
using System.Collections.Generic;

public class ListSubscriptionsInTopicSample
{
    public IEnumerable<string> ListSubscriptionsInTopic(string projectId, string topicId)
    {
        PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        IEnumerable<string> subscriptions = publisher.ListTopicSubscriptions(topicName);
        return subscriptions;
    }
}

Go

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/api/iterator"
)

func listSubscriptions(w io.Writer, projectID, topicID string) error {
	// projectID := "my-project-id"
	// topicName := "projects/sample-248520/topics/ocr-go-test-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	req := &pubsubpb.ListTopicSubscriptionsRequest{
		Topic: fmt.Sprintf("projects/%s/topics/%s", projectID, topicID),
	}
	it := client.TopicAdminClient.ListTopicSubscriptions(ctx, req)
	for {
		sub, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("error listing topic subscriptions: %w", err)
		}
		fmt.Fprintf(w, "got subscription: %s\n", sub)
	}
	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.TopicAdminClient;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class ListSubscriptionsInTopicExample {
  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";

    listSubscriptionInTopicExample(projectId, topicId);
  }

  public static void listSubscriptionInTopicExample(String projectId, String topicId)
      throws IOException {
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      for (String subscription : topicAdminClient.listTopicSubscriptions(topicName).iterateAll()) {
        System.out.println(subscription);
      }
      System.out.println("Listed all the subscriptions in the topic.");
    }
  }
}

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 this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_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 listTopicSubscriptions(topicNameOrId) {
  // Lists all subscriptions for the topic
  const [subscriptions] = await pubSubClient
    .topic(topicNameOrId)
    .getSubscriptions();

  console.log(`Subscriptions for ${topicNameOrId}:`);
  subscriptions.forEach(subscription => console.log(subscription.name));
}

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 this variable before running the sample.
 */
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';

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

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

async function listTopicSubscriptions(topicNameOrId: string) {
  // Lists all subscriptions for the topic
  const [subscriptions] = await pubSubClient
    .topic(topicNameOrId)
    .getSubscriptions();

  console.log(`Subscriptions for ${topicNameOrId}:`);
  subscriptions.forEach((subscription: Subscription) =>
    console.log(subscription.name),
  );
}

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"

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_id)

response = publisher.list_topic_subscriptions(request={"topic": topic_path})
for subscription in response:
    print(subscription)

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。

# topic_id = "your-topic-id"

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

response = topic_admin.list_topic_subscriptions \
  topic: pubsub.topic_path(topic_id)

puts "Subscriptions in topic #{topic_id}:"
response.subscriptions.each do |subscription_name|
  puts subscription_name
end

后续步骤

使用 gcloud 命令创建或修改订阅。
使用 REST API 创建或修改订阅。