/
reflector.js
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/
reflector.js
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var domain = require("domain");
var winston = require("winston");
var connect = require("connect");
var serveStatic = require("serve-static");
var serveIndex = require("serve-index");
var WebSocketServer = require('ws').Server;
var http = require("http");
var config = require("./config.js");
// Constants
////////////
var STATIC_DIR = "www";
// Logger configuration
///////////////////////
var logger = winston;
logger.clear();
logger.add(winston.transports.Console, {level: config.log.level, colorize: 'true'});
logger.setLevels(winston.config.npm.levels); // silly, debug, verbose, info, warn, error
// Setting-up the http server
/////////////////////////////
var app = connect();
app.use(serveStatic(STATIC_DIR));
app.use(serveIndex(STATIC_DIR));
var httpServer = http.createServer(app);
httpServer.on("listening", function() {
logger.info("Orca reflector signalization server started on port %s", config.server.port);
});
// Run the http server and handle errors
////////////////////////////////////////
var errorDomain = domain.create();
errorDomain.on('error', function(err) {
if(err.code === "EADDRINUSE") {
logger.error("Port %s is already in use, stopping.", config.server.port);
}
else {
logger.error(err);
}
});
errorDomain.run(function() {
httpServer.listen(config.server.port);
});
// Setting-up the reflector on top of WebSocket
///////////////////////////////////////////////
var wsRegistrar = new WebSocketServer({ server: httpServer });
wsRegistrar.on('connection', function(conn) {
logger.verbose("New client connected from %s:%s", conn._socket.remoteAddress, conn._socket.remotePort);
conn.isWho = null;
conn.on('message', function(message) {
logger.silly("Message received from %s:%s: %s", conn._socket.remoteAddress, conn._socket.remotePort, message);
messageHandler(message, conn);
});
conn.on('close', function() {
logger.verbose("Connection closed from %s:%s.", conn._socket.remoteAddress, conn._socket.remotePort);
closeHandler(conn);
});
});
// WebSocket / signal
/////////////////////
var registrar = Object.create(null);
function messageHandler(message, conn) {
try {
message = JSON.parse(message);
}
catch(e) {
logger.warn("JSON parsing error: " + e);
sendMessage("400/json", conn);
return;
}
if (! ("method" in message) ) {
logger.warn("Bad message received: " + message);
sendMessage("400/no-method", conn);
return;
}
switch(message.method) {
case "REGISTER":
if (conn.isWho !== null) {
sendMessage('REGISTER/200/already-registered', conn);
return;
}
if(! ("from" in message)) {
sendMessage("REGISTER/400/no-from", conn);
return;
}
if (message.from.length == 0) {
sendMessage("REGISTER/400/empty-from", conn);
return;
}
if (message.from in registrar) {
//sendMessage('REGISTER/400/duplicate-id', conn);
//return;
//close old client websocket
var oldConnection = registrar[message.from];
registrar[message.from] = conn;
oldConnection.close();
}
registrar[message.from] = conn;
conn.isWho = message.from;
logger.verbose("%s:%s registered as %s.", conn._socket.remoteAddress, conn._socket.remotePort, conn.isWho);
sendMessage('REGISTER/200/OK', conn);
break;
default:
if (conn.isWho === null) {
sendMessage(message.method+'/400/not-registered', conn);
return;
}
if ( ('to' in message) && !('from' in message)) {
sendMessage(message.method+'/400/no-from', conn);
return;
}
if ( ('to' in message) && (message.from != conn.isWho)) {
sendMessage(message.method+'/400/bad-from', conn);
return;
}
if (message.to === conn.isWho) {
sendMessage(message.method+'/400/oneself-forbidden', conn);
return;
}
if (message.to in registrar) {
registrar[message.to].send(JSON.stringify(message), sendCallback);
}
else {
sendMessage(message.method+'/400/peer-unavailable', conn);
}
}
}
function closeHandler(conn) {
if ((conn.isWho !== null) && (conn === registrar[conn.isWho])) {
delete registrar[conn.isWho];
}
}
function sendMessage(code, conn) {
var msg = {
method: code,
};
conn.send(JSON.stringify(msg), sendCallback);
}
// Errors (both immediate and async write errors) can be detected in an optional callback.
// The callback is also the only way of being notified that data has actually been sent.
var sendCallback = function(error) {
// if error is null, the send has been completed,
// otherwise the error object will indicate what failed.
if (error) {
logger.warn('[ ] sending error: '+error);
return;
}
logger.verbose('[ ] sending success');
};