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/**
* Module dependencies.
*/
var parser = require('socket.io-parser');
var debug = require('debug')('socket.io:client');
var url = require('url');
/**
* Module exports.
*/
module.exports = Client;
/**
* Client constructor.
*
* @param {Server} server instance
* @param {Socket} conn
* @api private
*/
function Client(server, conn){
this.server = server;
this.conn = conn;
this.encoder = server.encoder;
this.decoder = new server.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} name namespace
* @api private
*/
Client.prototype.connect = function(name, query){
debug('connecting to namespace %s', name);
var nsp = this.server.nsps[name];
if (!nsp) {
this.packet({ type: parser.ERROR, nsp: name, data : 'Invalid namespace'});
return;
}
if ('/' != name && !this.nsps['/']) {
this.connectBuffer.push(name);
return;
}
var self = this;
var socket = nsp.add(this, query, function(){
self.sockets[socket.id] = 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(){
for (var id in this.sockets) {
if (this.sockets.hasOwnProperty(id)) {
this.sockets[id].disconnect();
}
}
this.sockets = {};
this.close();
};
/**
* Removes a socket. Called by each `Socket`.
*
* @api private
*/
Client.prototype.remove = function(socket){
if (this.sockets.hasOwnProperty(socket.id)) {
var nsp = this.sockets[socket.id].nsp.name;
delete this.sockets[socket.id];
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 {Object} opts
* @api private
*/
Client.prototype.packet = function(packet, opts){
opts = opts || {};
var self = this;
// this writes to the actual connection
function writeToEngine(encodedPackets) {
if (opts.volatile && !self.conn.transport.writable) return;
for (var i = 0; i < encodedPackets.length; i++) {
self.conn.write(encodedPackets[i], { compress: opts.compress });
}
}
if ('open' == this.conn.readyState) {
debug('writing packet %j', packet);
if (!opts.preEncoded) { // not broadcasting, need to encode
this.encoder.encode(packet, writeToEngine); // encode, then write results to engine
} 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(url.parse(packet.nsp).pathname, url.parse(packet.nsp, true).query);
} else {
var socket = this.nsps[packet.nsp];
if (socket) {
process.nextTick(function() {
socket.onpacket(packet);
});
} else {
debug('no socket for namespace %s', packet.nsp);
}
}
};
/**
* Handles an error.
*
* @param {Object} err object
* @api private
*/
Client.prototype.onerror = function(err){
for (var id in this.sockets) {
if (this.sockets.hasOwnProperty(id)) {
this.sockets[id].onerror(err);
}
}
this.conn.close();
};
/**
* 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
for (var id in this.sockets) {
if (this.sockets.hasOwnProperty(id)) {
this.sockets[id].onclose(reason);
}
}
this.sockets = {};
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);
};
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