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index.js
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index.js
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var cluster = require('cluster');
var net = require('net');
var urlHelper = require('url');
var qs = require('querystring');
var sio = require('socket.io');
var express = require('express');
var port = 9001;
var num_processes = require('os').cpus().length;
if (cluster.isMaster) {
var workers = [];
for (var i = 0; i < num_processes; i++) {
workers[i] = cluster.fork();
}
// Create the outside facing server listening on our port.
var server = net.createServer({ pauseOnConnect: true }, function(socket) {
socket.on('readable', function () {
var buffer = socket.read();
if (!buffer) {
return
}
var headers = buffer.toString();
var to = headers.indexOf('HTTP');
// Quick & dirty way to get query string params
console.log(headers.substr(0, to));
var url = headers.substr(0, to).replace('GET /','http://').replace('POST /', 'http://');
var queryParams = qs.parse(urlHelper.parse(url).query);
var index = queryParams.userId % num_processes;
var worker = workers[index];
worker.send({
type:'sticky-session:connection',
buffer: buffer.toString()
}, socket);
});
}).listen(port);
} else {
// Group sockets on userId
var sessions = [];
// Note we don't use a port here because the master listens on it for us.
// Here you might use middleware, attach routes, etc.
// Don't expose our internal server to the outside.
var app = new express();
var server = app.listen(0, 'localhost');
var io = sio(server);
// Here you might use Socket.IO middleware for authorization etc.
io.use(function(socket, next) {
var userId = socket.handshake.query.userId;
// make sure the handshake data looks good as before
// if error do this:
// next(new Error('not authorized'));
// else just call next
if (sessions.hasOwnProperty(userId)) {
if (sessions[userId].length >= 5) {
next(new Error('Too many sessions per one account'));
return;
}
sessions[userId].push(socket);
} else {
sessions[userId] = [socket];
}
next();
});
io.sockets.on('connection', function (socket) {
var userId = socket.handshake.query.userId;
socket.emit('this', 'Hello [' + userId + ']!');
console.log(process.pid + ': I received connect from ', userId, ' and say hello!');
socket.on('request', function (userId, data) {
console.log(process.pid + ': I received request from ', userId, ' saying ', data);
if (! sessions.hasOwnProperty(userId)) {
return;
}
sessions[userId].forEach(function(v,i){
v.emit('response', data);
})
});
socket.on('disconnect', function () {
var login = socket.handshake.query.userId;
if (! sessions.hasOwnProperty(userId)) {
return;
}
var i = sessions[userId].indexOf(socket);
if (i != -1) {
sessions[userId].splice(i, 1);
}
console.log(process.pid + ': The user: '+ userId + ' disconnected ('+socket.id+')');
});
});
// Listen to messages sent from the master. Ignore everything else.
process.on('message', function(message, socket) {
if (message.type !== 'sticky-session:connection') {
return;
}
// Emulate a connection event on the server by emitting the
// event with the connection the master sent us.
server.emit('connection', socket);
// Call data event for socket with first chunk of client request
var buffer = Buffer.from(message.buffer);
socket.emit('data', buffer);
socket.resume();
});
}