Forward request to ws client and wait for response Express

Question

I\'m trying to build an endpoint that will receive a request, emit the request data to a WebSocket client, wait for an event, then send back the response using express + soc

Answer 1

Keep an array of express responses and set an id to each request. So it can be used later and delete if needed.

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var timeout = require('connect-timeout');
var uuid = require('uuidv4');
var _ = require('lodash');

app.use(timeout('10s'));

app.get('/', (req, res) => {
    res.sendFile(__dirname + '/index.html');
});

let responses = []

io.on('connection', (socket) => {
    socket.on('res', (e) => {
        var obj = _.find(responses, r => r.id === e.id);
        obj.res.send(e)
        _.remove(responses, r => r.id === e.id);
    })
})

app.get('/endpoint', (req, res) => {
    const id = uuid()
    io.emit('req', { id, ip: req.ip, header: req.headers, method: req.method });
    responses.push({ id, res })
});

http.listen(3000);