Started on node.js+socket.io+mongoDB on the backend for more responsivnes

server/node_modules/socket.io/lib/client.js

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+
+/**
+ * Module dependencies.
+ */
+
+var parser = require('socket.io-parser');
+var debug = require('debug')('socket.io:client');
+
+/**
+ * Module exports.
+ */
+
+module.exports = Client;
+
+/**
+ * Client constructor.
+ *
+ * @param {Server} server instance
+ * @param {Socket} connection
+ * @api private
+ */
+
+function Client(server, conn){
+  this.server = server;
+  this.conn = conn;
+  this.encoder = new parser.Encoder();
+  this.decoder = new parser.Decoder();
+  this.id = conn.id;
+  this.request = conn.request;
+  this.setup();
+  this.sockets = [];
+  this.nsps = {};
+  this.connectBuffer = [];
+}
+
+/**
+ * Sets up event listeners.
+ *
+ * @api private
+ */
+
+Client.prototype.setup = function(){
+  this.onclose = this.onclose.bind(this);
+  this.ondata = this.ondata.bind(this);
+  this.onerror = this.onerror.bind(this);
+  this.ondecoded = this.ondecoded.bind(this);
+
+  this.decoder.on('decoded', this.ondecoded);
+  this.conn.on('data', this.ondata);
+  this.conn.on('error', this.onerror);
+  this.conn.on('close', this.onclose);
+};
+
+/**
+ * Connects a client to a namespace.
+ *
+ * @param {String} namespace name
+ * @api private
+ */
+
+Client.prototype.connect = function(name){
+  debug('connecting to namespace %s', name);
+  if (!this.server.nsps[name]) {
+    this.packet({ type: parser.ERROR, nsp: name, data : 'Invalid namespace'});
+    return;
+  }
+  var nsp = this.server.of(name);
+  if ('/' != name && !this.nsps['/']) {
+    this.connectBuffer.push(name);
+    return;
+  }
+
+  var self = this;
+  var socket = nsp.add(this, function(){
+    self.sockets.push(socket);
+    self.nsps[nsp.name] = socket;
+
+    if ('/' == nsp.name && self.connectBuffer.length > 0) {
+      self.connectBuffer.forEach(self.connect, self);
+      self.connectBuffer = [];
+    }
+  });
+};
+
+/**
+ * Disconnects from all namespaces and closes transport.
+ *
+ * @api private
+ */
+
+Client.prototype.disconnect = function(){
+  var socket;
+  // we don't use a for loop because the length of
+  // `sockets` changes upon each iteration
+  while (socket = this.sockets.shift()) {
+    socket.disconnect();
+  }
+  this.close();
+};
+
+/**
+ * Removes a socket. Called by each `Socket`.
+ *
+ * @api private
+ */
+
+Client.prototype.remove = function(socket){
+  var i = this.sockets.indexOf(socket);
+  if (~i) {
+    var nsp = this.sockets[i].nsp.name;
+    this.sockets.splice(i, 1);
+    delete this.nsps[nsp];
+  } else {
+    debug('ignoring remove for %s', socket.id);
+  }
+};
+
+/**
+ * Closes the underlying connection.
+ *
+ * @api private
+ */
+
+Client.prototype.close = function(){
+  if ('open' == this.conn.readyState) {
+    debug('forcing transport close');
+    this.conn.close();
+    this.onclose('forced server close');
+  }
+};
+
+/**
+ * Writes a packet to the transport.
+ *
+ * @param {Object} packet object
+ * @param {Boolean} whether packet is already encoded
+ * @param {Boolean} whether packet is volatile
+ * @api private
+ */
+
+Client.prototype.packet = function(packet, preEncoded, volatile){
+  var self = this;
+
+  // this writes to the actual connection
+  function writeToEngine(encodedPackets) {
+    if (volatile && !self.conn.transport.writable) return;
+    for (var i = 0; i < encodedPackets.length; i++) {
+      self.conn.write(encodedPackets[i]);
+    }
+  }
+
+  if ('open' == this.conn.readyState) {
+    debug('writing packet %j', packet);
+    if(!preEncoded) { // not broadcasting, need to encode
+      this.encoder.encode(packet, function (encodedPackets) { // encode, then write results to engine
+        writeToEngine(encodedPackets);
+      });
+    } else { // a broadcast pre-encodes a packet
+      writeToEngine(packet);
+    }
+  } else {
+    debug('ignoring packet write %j', packet);
+  }
+};
+
+/**
+ * Called with incoming transport data.
+ *
+ * @api private
+ */
+
+Client.prototype.ondata = function(data){
+  // try/catch is needed for protocol violations (GH-1880)
+  try {
+    this.decoder.add(data);
+  } catch(e) {
+    this.onerror(e);
+  }
+};
+
+/**
+ * Called when parser fully decodes a packet.
+ *
+ * @api private
+ */
+
+Client.prototype.ondecoded = function(packet) {
+  if (parser.CONNECT == packet.type) {
+    this.connect(packet.nsp);
+  } else {
+    var socket = this.nsps[packet.nsp];
+    if (socket) {
+      socket.onpacket(packet);
+    } else {
+      debug('no socket for namespace %s', packet.nsp);
+    }
+  }
+};
+
+/**
+ * Handles an error.
+ *
+ * @param {Objcet} error object
+ * @api private
+ */
+
+Client.prototype.onerror = function(err){
+  this.sockets.forEach(function(socket){
+    socket.onerror(err);
+  });
+  this.onclose('client error');
+};
+
+/**
+ * Called upon transport close.
+ *
+ * @param {String} reason
+ * @api private
+ */
+
+Client.prototype.onclose = function(reason){
+  debug('client close with reason %s', reason);
+
+  // ignore a potential subsequent `close` event
+  this.destroy();
+
+  // `nsps` and `sockets` are cleaned up seamlessly
+  var socket;
+  while (socket = this.sockets.shift()) {
+    socket.onclose(reason);
+  }
+
+  this.decoder.destroy(); // clean up decoder
+};
+
+/**
+ * Cleans up event listeners.
+ *
+ * @api private
+ */
+
+Client.prototype.destroy = function(){
+  this.conn.removeListener('data', this.ondata);
+  this.conn.removeListener('error', this.onerror);
+  this.conn.removeListener('close', this.onclose);
+  this.decoder.removeListener('decoded', this.ondecoded);
+};