Node.js NodeJS：处理突然的云发布/订阅删除

我正在开发一个NodeJS应用程序，它监听谷歌云发布/订阅。 这是我的相关代码：

const messageHandler = message => {
    console.log(message.id);
};
subscription.on("message", messageHandler);

作为系统体系结构的一部分，订阅可能会突然被外部资源删除，在这种情况下，我的应用程序会因以下错误日志而崩溃：

events.js:174
  throw er; // Unhandled 'error' event
  ^

Error: Resource not found (resource=projects/proj-name/subscriptions/subscription-name).
    at MessageStream._onEnd (/Users/admin/Projects/proj-name/socket_server/node_modules/@google-cloud/pubsub/build/src/message-stream.js:244:26)
    at MessageStream._onStatus (/Users/admin/Projects/proj-name/node_modules/@google-cloud/pubsub/build/src/message-stream.js:281:18)
    at ClientDuplexStreamImpl.stream.on.once.status (/Users/admin/Projects/proj-name/node_modules/@google-cloud/pubsub/build/src/message-stream.js:146:44)
    at Object.onceWrapper (events.js:286:20)
    at ClientDuplexStreamImpl.emit (events.js:198:13)
    at Object.onReceiveStatus (/Users/admin/Projects/proj-name/node_modules/@grpc/grpc-js/build/src/client.js:389:24)
    at Object.onReceiveStatus (/Users/admin/Projects/proj-name/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:299:181)
    at process.nextTick (/Users/admin/Projects/proj-name/node_modules/@grpc/grpc-js/build/src/call-stream.js:130:78)
    at process._tickCallback (internal/process/next_tick.js:61:11)
Emitted 'error' event at:
    at Subscriber.Subscription._subscriber.on.err (/Users/admin/Projects/proj-name/node_modules/@google-cloud/pubsub/build/src/subscription.js:198:38)
    at Subscriber.emit (events.js:198:13)
    at MessageStream._stream.on.err (/Users/admin/Projects/proj-name/node_modules/@google-cloud/pubsub/build/src/subscriber.js:328:38)
    at MessageStream.emit (events.js:198:13)
    at emitErrorNT (internal/streams/destroy.js:91:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)

有没有办法优雅地处理这种删除？

---

谢谢

您可以查看pub/sub doc以了解更多信息

脚本的实现持续侦听错误或消息，直到达到分配的超时

顺便说一句，您应该设置一个新订户并重置侦听，或者重新创建已删除的订户并侦听主题

以下是中的代码段：

下面是我做的一个测试：

---

嗨，这真是太棒了！谢谢

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const subscriptionName = 'YOUR_SUBSCRIPTION_NAME';
// const timeout = 10;

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

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

function listenForErrors() {
  // References an existing subscription
  const subscription = pubSubClient.subscription(subscriptionName);

  // Create an event handler to handle messages
  const messageHandler = function (message) {
    // Do something with the message
    console.log(`Message: ${message}`);

    // "Ack" (acknowledge receipt of) the message
    message.ack();
  };

  // Create an event handler to handle errors
  const errorHandler = function (error) {
    // Do something with the error
    console.error(`ERROR: ${error}`);
    throw error;
  };

  // Listen for new messages/errors until timeout is hit
  subscription.on('message', messageHandler);
  subscription.on('error', errorHandler);

  setTimeout(() => {
    subscription.removeListener('message', messageHandler);
    subscription.removeListener('error', errorHandler);
  }, timeout * 1000);
}

listenForErrors();