[doc] Added examples/latent-websocket-proxy.js

examples/latent-websocket-proxy.js

+/*
+  standalone-websocket-proxy.js: Example of proxying websockets over HTTP with a standalone HTTP server.
+
+  Copyright (c) 2010 Charlie Robbins, Mikeal Rogers, Fedor Indutny, & Marak Squires.
+
+  Permission is hereby granted, free of charge, to any person obtaining
+  a copy of this software and associated documentation files (the
+  "Software"), to deal in the Software without restriction, including
+  without limitation the rights to use, copy, modify, merge, publish,
+  distribute, sublicense, and/or sell copies of the Software, and to
+  permit persons to whom the Software is furnished to do so, subject to
+  the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+var sys = require('sys'),
+    http = require('http'),
+    colors = require('colors'),
+    websocket = require('./../vendor/websocket'),
+    httpProxy = require('./../lib/node-http-proxy');
+
+try {
+  var utils = require('socket.io/lib/socket.io/utils'),
+      io = require('socket.io');
+}
+catch (ex) {
+  console.error('Socket.io is required for this example:');
+  console.error('npm ' + 'install'.green + ' socket.io@0.6.18'.magenta);
+  process.exit(1);
+}
+
+//
+// Create the target HTTP server
+//
+var server = http.createServer(function (req, res) {
+  res.writeHead(200);
+  res.end();
+});
+
+server.listen(8080);
+
+//
+// Setup socket.io on the target HTTP server
+//
+var socket = io.listen(server);
+socket.on('connection', function (client) {
+  sys.debug('Got websocket connection');
+
+  client.on('message', function (msg) {
+    sys.debug('Got message from client: ' + msg);
+  });
+
+  socket.broadcast('from server');
+});
+
+//
+// Setup our server to proxy standard HTTP requests
+//
+var proxy = new httpProxy.HttpProxy();
+var proxyServer = http.createServer(function (req, res) {
+  proxy.proxyRequest(req, res, {
+    host: 'localhost', 
+    port: 8080
+  })
+});
+
+//
+// Listen to the `upgrade` event and proxy the 
+// WebSocket requests as well.
+//
+proxyServer.on('upgrade', function (req, socket, head) {
+  var buffer = proxy.buffer(socket);
+  
+  setTimeout(function () {
+    proxy.proxyWebSocketRequest(req, socket, head, {
+      port: 8080,
+      host: 'localhost',
+      buffer: buffer
+    });
+  }, 1000);
+});
+
+proxyServer.listen(8081);
+
+//
+// Setup the web socket against our proxy
+//
+var ws = new websocket.WebSocket('ws://localhost:8081/socket.io/websocket/', 'borf');
+
+ws.on('open', function () {
+  ws.send(utils.encode('from client'));
+});
+
+ws.on('message', function (msg) {
+  sys.debug('Got message: ' + utils.decode(msg));
+});