metro/webSocketProxy.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
'use strict';
var WebSocketServer = require('ws').Server;
function attachToServer(server, path) {
var wss = new WebSocketServer({
server: server,
path: path
});
var clients = [];
function sendSpecial(message) {
clients.forEach(function (cn) {
try {
cn.send(JSON.stringify(message));
} catch(e) {
console.warn('WARN: ' + e.message);
}
});
}
wss.on('connection', function(ws) {
var id = Math.random().toString(15).slice(10, 20);
sendSpecial({$open: id});
clients.push(ws);
var allClientsExcept = function(ws) {
return clients.filter(function(cn) { return cn !== ws; });
};
ws.onerror = function() {
clients = allClientsExcept(ws);
sendSpecial({$error: id});
};
ws.onclose = function() {
clients = allClientsExcept(ws);
sendSpecial({$close: id});
};
ws.on('message', function(message) {
allClientsExcept(ws).forEach(function(cn) {
try {
// Sometimes this call throws 'not opened'
cn.send(message);
} catch(e) {
console.warn('WARN: ' + e.message);
}
});
});
});
}
module.exports = {
attachToServer: attachToServer
};