node-ipc/lib/socketServer.js

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var net = require('net'),
fs = require('fs'),
dgram = require('dgram'),
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eventParser = require('../lib/eventParser.js'),
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pubsub = require('event-pubsub');
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function emit(socket, type, data){
if(!data)
data=false;
this.log('dispatching event to socket'.debug, ' : ', type.data, data);
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var event={
type:type,
data:data
}
if(this.udp4 || this.udp6){
if(!socket.address || !socket.port){
this.log('Attempting to emit to a single UDP socket without supplying socket address or port. Redispatching event as broadcast to all connected sockets');
this.broadcast(type,data);
return;
}
this.server.write(
eventParser.format(
event
),
socket
)
return;
};
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socket.write(
eventParser.format(
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event
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)
);
};
function broadcast(type,data){
this.log('broadcasting event to all known sockets listening to '.debug, this.path.variable,' : ', ((this.port)?this.port:''), type, data);
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if(!data)
data=false;
var e=eventParser.format(
{
type:type,
data:data
}
);
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if(this.udp4 || this.udp6){
for(var i=1, count=this.sockets.length; i<count; i++){
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this.server.write(e,this.sockets[i]);
}
}else{
for(var i=0, count=this.sockets.length; i<count; i++){
this.sockets[i].write(e);
}
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}
};
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function init(path,config,log,port){
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var server={
config : config,
path : path,
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port : port,
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udp4 : false,
udp6 : false,
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log : log,
server : false,
sockets : [],
emit : emit,
broadcast : broadcast,
define : {
listen : {
'get.events.broadcasting' : 'does not require any special paramaters',
'get.events.listening' : 'does not require any special paramaters'
},
broadcast : {
'events.broadcasting' : 'data.events is a JSON object of event definitions by type '+config.id+' will broadcast on '+path,
'events.listening' : 'data.events is a JSON object of event definitions by type '+config.id+' is listening for on '+path
}
},
onStart : function(socket){
this.trigger(
'start',
socket
);
},
start : function(){
if(!this.path){
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server.log('Socket Server Path not specified, refusing to start'.warn);
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return;
}
fs.unlink(
this.path,
(
function(server){
return function () {
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server.log('starting server on '.debug,server.path.variable,((server.port)?':'+server.port:'').variable);
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if(!server.udp4 && !server.udp6){
server.server=net.createServer(
serverCreated
);
}else{
function UDPWrite(message,socket){
var data=new Buffer(message, server.config.encoding);
server.server.send(
data,
0,
data.length,
socket.port,
socket.address,
function(err, bytes) {
if(err){
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server.trigger(
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'error',
function(err){
server.trigger('error',err);
}
);
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}
}
);
}
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server.server=dgram.createSocket(
((server.udp4)? 'udp4':'udp6')
);
server.server.write=UDPWrite;
server.server.on(
'listening',
function () {
serverCreated(server.server)
}
);
}
function serverCreated(socket) {
server.sockets.push(socket);
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if(socket.setEncoding)
socket.setEncoding(server.config.encoding);
server.log('## socket connection to server detected ##'.rainbow);
socket.on(
'close',
function(socket){
server.trigger(
'close',
socket
);
}
);
socket.on(
'error',
function(err){
server.trigger('error',err);
}
);
socket.on(
'data',
function(data,UDPSocket){
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if(!this.ipcBuffer)
this.ipcBuffer='';
data=(this.ipcBuffer+=data);
if(data.slice(-1)!=eventParser.delimiter){
server.log('Socket buffer size exceeded, consider smaller messages or a larger buffer.'.warn, 'Implementing software buffer expansion for this message.'.notice);
return;
}
this.ipcBuffer='';
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data=eventParser.parse(data);
var sock=((server.udp4 || server.udp6)? UDPSocket : socket);
while(data.length>0){
var e=JSON.parse(data.shift());
server.log('received event of : '.debug,e.type.data,e.data);
if(e.data.id)
sock.id=e.data.id;
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server.trigger(
e.type,
e.data,
sock
);
}
}
);
socket.on(
'message',
function(msg,rinfo) {
if (!rinfo)
return;
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server.log('Received UDP message from '.debug, rinfo.address.variable, rinfo.port);
socket.emit('data',msg.toString(),rinfo);
}
);
server.trigger(
'connect',
socket
);
server.trigger(
'get.events.broadcasting',
socket
);
server.trigger(
'get.events.listening',
socket
);
}
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function started(socket){
server.onStart(socket)
}
if(!port){
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server.log('starting server as'.debug, 'Unix Socket'.variable);
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server.server.listen(
server.path,
started
);
server.server.maxConnections=server.maxConnections;
return;
}
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if(!server.udp4 && !server.udp4){
server.log('starting server as'.debug, 'TCP'.variable);
server.server.listen(
server.port,
server.path,
started
);
return;
}
server.log('starting server as'.debug,((server.udp4)? 'udp4':'udp6').variable);
server.server.bind(
server.port,
server.path
);
started(
{
address : server.path,
port : server.port
}
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);
}
}
)(this)
);
}
};
new pubsub(server);
server.on(
'get.events.broadcasting',
function(socket){
server.emit(
socket,
'events.broadcasting',
{
id : server.config.id,
events : server.define.broadcast
}
);
}
);
server.on(
'get.events.listening',
function(socket){
server.emit(
socket,
'events.listening',
{
id : server.config.id,
events : server.define.listen,
}
);
}
)
server.on(
'close',
function(){
for(var i=0, count=server.sockets.length; i<count; i++){
var socket=server.sockets[i];
var destroyedSocketId=null;
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if(socket){
if(socket.readable)
continue;
}
if(socket.id)
destroyedSocketId=socket.id;
server.log('socket disconnected'.notice,' '+destroyedSocketId.variable);
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if(socket)
socket.destroy();
server.sockets.splice(i,1);
server.trigger('socket.disconnected', socket, destroyedSocketId);
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return;
}
}
);
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return server;
}
module.exports=init;