[examples] updated balancer examples

Author: cronopio

examples/balancer/simple-balancer-with-websockets.js

@@ -0,0 +1,58 @@
+var http = require('http'),
+    httpProxy = require('../../lib/http-proxy');
+
+//
+// A simple round-robin load balancing strategy.
+// 
+// First, list the servers you want to use in your rotation.
+//
+var addresses = [
+  {
+    host: 'ws1.0.0.0',
+    port: 80
+  },
+  {
+    host: 'ws2.0.0.0',
+    port: 80
+  }
+];
+
+//
+// Create a HttpProxy object for each target
+//
+
+var proxies = addresses.map(function (target) {
+  return new httpProxy.createProxyServer({
+    target: target
+  });
+});
+
+//
+// Get the proxy at the front of the array, put it at the end and return it
+// If you want a fancier balancer, put your code here
+//
+
+function nextProxy() {
+  var proxy = proxies.shift();
+  proxies.push(proxy);
+  return proxy;
+}
+
+// 
+// Get the 'next' proxy and send the http request 
+//
+
+var server = http.createServer(function (req, res) {    
+  nextProxy().web(req, res);
+});
+
+// 
+// Get the 'next' proxy and send the upgrade request 
+//
+
+server.on('upgrade', function (req, socket, head) {
+  nextProxy().ws(req, socket, head);
+});
+
+server.listen(8080);  
+  

examples/balancer/simple-balancer.js

@@ -0,0 +1,38 @@
+var http = require('http'),
+    httpProxy = require('../../lib/http-proxy');
+//
+// A simple round-robin load balancing strategy.
+// 
+// First, list the servers you want to use in your rotation.
+//
+var addresses = [
+  {
+    host: 'ws1.0.0.0',
+    port: 80
+  },
+  {
+    host: 'ws2.0.0.0',
+    port: 80
+  }
+];
+var proxy = httpProxy.createServer();
+
+http.createServer(function (req, res) {
+  //
+  // On each request, get the first location from the list...
+  //
+  var target = { target: addresses.shift() };
+
+  //
+  // ...then proxy to the server whose 'turn' it is...
+  //
+  console.log('balancing request to: ', target);
+  proxy.web(req, res, target);
+
+  //
+  // ...and then the server you just used becomes the last item in the list.
+  //
+  addresses.push(target);
+}).listen(8000);
+
+// Rinse; repeat; enjoy.