HTML中的NodeJS Websocket使用变量（带有express？）

Question

I have been searching for two days now looking for a solution that might work for me. Sadly I have only seen examples and guides on how to setup a websocket server (that sends messages back and forth to clients) and a websocket client (that resides in browser). None of these really work for me, and I am not sure how to achieve what I want here.

Basically I have the following websocket:

require('dotenv').config()

const WebSocket = require('ws');

var connection = new WebSocket('ws://XXX');

connection.onopen = function () {
  connection.send(JSON.stringify({"authenticate":process.env.API}));
  connection.send(JSON.stringify({"XXX":"YYY"}));
  connection.send(JSON.stringify({
    "db" : "unique_id", 
    "query" : { 
        "table" : "users"
    } 
}));  
};
connection.onerror = function (error) {
  console.log('WebSocket Error ' + error);
};

connection.onmessage = function (e) {
  console.log('Server: ' + e.data);
  var myResponse = JSON.parse(e.data);
  var qList = myResponse.results;
};

What I want to do is have my nodeJS-script running, for example an express script with a html page, that also includes the response from onmessage. Why I am complicating this instead of just using the websocket client-side is that I cannot send my auth-code publicly.

Hope I have been clear enough, let me know if you are unsure of my question!

PS. If you think I would be better off using another websocket-script such as Socket.io - I have been looking at them and have not gotten much wiser sadly.

Answer 1

You have a lot of options. Probably the easiest is to export the connection. At the bottom of the file, eg module.exports = connection

Then in the express application, import the connection, eg const connection = require('./path/connection');

Then make a function that calls itself at a given interval and sends the appropriate message.

Then within the Express app you can use something like connection.on('message', (data, flags) => // do stuff);

Your other option is to create a store object. Eg

// ./store.js

class store  {
  constructor() {
    this.wsMaterial = {};
  }

 add(wsInfo) {
    this.wsMaterial[key] = wsInfo

 }

 get store() {
   return this.wsMaterial
 }
}

module.exports = new store()

Then import the store and updated it, eg

// ./websocket file

const store = require('./store');

...

connection.onmessage = function (e) {
  console.log('Server: ' + e.data);
  var myResponse = JSON.parse(e.data);
  var qList = myResponse.results;
  store.add(qList)
};

Then from Express...

// ./express.js

const store = require('./store');

store.get // all of your stuff;