mongo连接失败时如何让节点退出 [英] How to get node to exit when mongo connect fails

问题描述

如果我的 Node JS 应用无法连接到 Mongo，我希望它立即退出.我正在使用 mongodb 节点库.

I'd like my Node JS app to exit immediately if it can't connect to Mongo. I'm using the mongodb node library.

我已将代码缩减为

const {MongoClient} = require('mongodb');
MongoClient.connect('mongodb://localhost:27017');

如果 Mongo 未运行，我会收到带有 ECONNREFUSED 的 UnhandledPromiseRejectionWarning，这是我完全预料到的，但随后程序挂起并且永不退出.这是 Node 版本 10.0.0.

If Mongo is not running, I get an UnhandledPromiseRejectionWarning with ECONNREFUSED, which I fully expect, but then the program hangs and never exits. This is with Node version 10.0.0.

由于连接从未成功，我没有要关闭的连接句柄.我尝试了各种方法来catch被拒绝的承诺，但我一直没有成功让程序退出.

Since the connection never succeeded I don't have a connection handle to close. I've tried various ways to catch the rejected promise, but I have been unsuccessful in getting the program to exit.

在这种情况下，我需要做什么来关闭 MongoClient 并使程序退出?

What do I need to do to shut down the MongoClient and make the program exit in this case?

推荐答案

您的应用程序保持活动状态，因为它正在尝试 重新连接.您可以尝试禁用重新连接:

Your application is remaining alive because it is trying to reconnect. You can try disabling the recconect:

MongoClient.connect('mongodb://localhost:27017', {
  autoReconnect: false
}, (err, client) => {
  if (client) client.close();
});

或者，您可以使用 process.exit(1)杀死程序.

Or, you can terminate the process using process.exit(1) to kill the program.

const {
  MongoClient
} = require('mongodb');

// Callback syntax
MongoClient.connect('mongodb://localhost:27017', (err, db) => {
  if (err) process.exit(1);
});

// Promise syntax
MongoClient
  .connect('mongodb://localhost:27017')
  .catch(err => {
    process.exit(1);
  });

// Async/await syntax
(async function() {
  let db;
  try {
    db = await MongoClient.connect('mongodb://localhost:27017');
  } catch (err) {
    process.exit(1);
  }
}());

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