如何在 node.js 中阻止 server.js

Question

Problem statement

I have server.js in which I have a config file

My server.js

1. Some imports

2. require config.js -> api call to get config /promise call

3. Server start using value in config

4. Before I get config, server tries to start and crash as config is empty.

How do I block process to go beyond config.js step

Answer 1

在承诺完成之前，您无法启动服务器，因此您实际上拥有非空配置。

Answer 2

I don't know if I understand completely your situation. But, if you want to start your server after the request you can use the then or async / await to do that. Considere this simple snippet:

const express = require('express');
const app = express();
const getConfig = require('./config');

const expressConfigs = (app, config) => {
  app.get('/', (req, res) =>  {
    res.send('Hello World!');
  });

  app.listen(config.port, () => {
    console.log(`Example app listening on port ${config.port}!`);
  });
};

(async () => {
  const config = await getConfig();
  expressConfigs(app, config);
})();

OBS: config soube export one Promise, you could use node-fetch for that.