node-ipc/lib/client.js

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var net = require('net'),
tls = require('tls'),
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eventParser = require('../lib/eventParser.js'),
pubsub = require('event-pubsub'),
Message = require('js-message'),
fs = require('fs'),
Queue = require('js-queue');
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function init(config,log){
var client={
config : config,
queue : new Queue,
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socket : false,
connect : connect,
emit : emit,
log : log,
retriesRemaining:config.maxRetries||0
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}
new pubsub(client);
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return client;
}
function emit(type,data){
this.log('dispatching event to '.debug, this.id.variable, this.path.variable,' : ', type.data,',', data);
var message=new Message;
message.type=type;
message.data=data;
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if(this.config.rawBuffer){
message=new Buffer(type,this.encoding);
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}else{
message=eventParser.format(message);
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}
if(!this.config.sync){
this.socket.write(message);
return;
}
this.queue.add(
syncEmit.bind(this,message)
);
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};
function syncEmit(message){
this.log('dispatching event to '.debug, this.id.variable, this.path.variable,' : ', message.data);
this.socket.write(message);
}
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function connect(){
//init client object for scope persistance especially inside of socket events.
var client=this;
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client.log('requested connection to '.debug, client.id.variable, client.path.variable);
if(!this.path){
client.log('\n\n######\nerror: '.error, client.id .info,' client has not specified socket path it wishes to connect to.'.error);
return;
}
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if(!client.port){
client.log('Connecting client on Unix Socket :'.debug, client.path.variable);
var path = client.path;
if (process.platform ==='win32' && !client.path.startsWith('\\\\.\\pipe\\')){
path = path.replace(/^\//, '');
path = path.replace(/\//g, '-');
path= '\\\\.\\pipe\\'+path;
}
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client.socket = net.connect(
{
path: path
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}
);
}else{
if(!client.config.tls){
client.log('Connecting client via TCP to'.debug, client.path.variable ,client.port);
client.socket = net.connect(
{
port:client.port,
host:client.path
}
);
}else{
client.log('Connecting client via TLS to'.debug, client.path.variable ,client.port,client.config.tls);
if(client.config.tls.private){
client.config.tls.key=fs.readFileSync(client.config.tls.private);
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}
if(client.config.tls.public){
client.config.tls.cert=fs.readFileSync(client.config.tls.public);
}
if(client.config.tls.trustedConnections){
if(typeof client.config.tls.trustedConnections === 'string'){
client.config.tls.trustedConnections=[client.config.tls.trustedConnections];
}
client.config.tls.ca=[];
for(var i=0; i<client.config.tls.trustedConnections.length; i++){
client.config.tls.ca.push(
fs.readFileSync(client.config.tls.trustedConnections[i])
);
}
}
client.config.tls.host=client.path;
client.config.tls.port=client.port;
client.socket = tls.connect(
client.config.tls
);
}
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}
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client.socket.setEncoding(this.config.encoding);
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client.socket.on(
'error',
function(err){
client.log('\n\n######\nerror: '.error, err);
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client.trigger('error', err);
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}
);
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client.socket.on(
'connect',
function(){
client.trigger('connect');
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client.retriesRemaining=client.config.maxRetries;
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client.log('retrying reset');
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}
);
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client.socket.on(
'close',
function(){
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client.log('connection closed'.notice ,client.id.variable , client.path.variable, client.retriesRemaining+' tries remaining of '+client.config.maxRetries);
if(
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client.config.stopRetrying || client.retriesRemaining<1
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){
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client.trigger('disconnect');
client.log(
client.config.id.variable,
'exceeded connection rety amount of'.warn,
" or stopRetrying flag set."
);
client.socket.destroy();
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client.trigger('destroy');
client=undefined;
return;
}
client.isRetrying=true;
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setTimeout(
(
function(client){
return function(){
client.retriesRemaining--;
client.isRetrying=false;
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client.connect();
setTimeout(
function(){
if(!client.isRetrying)
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client.retriesRemaining=client.config.maxRetries;
},
100
)
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}
}
)(client),
client.config.retry
);
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client.trigger('disconnect');
}
);
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client.socket.on(
'data',
function(data) {
client.log('## recieved events ##'.rainbow);
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if(client.config.rawBuffer){
client.trigger(
'data',
new Buffer(data,this.encoding)
);
if(!client.config.sync){
return;
}
client.queue.next();
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return;
}
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if(!this.ipcBuffer)
this.ipcBuffer='';
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data=(this.ipcBuffer+=data);
if(data.slice(-1)!=eventParser.delimiter || data.indexOf(eventParser.delimiter) == -1){
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client.log('Implementing larger buffer for this socket message. You may want to consider smaller messages'.notice);
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return;
}
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this.ipcBuffer='';
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var events = eventParser.parse(data);
var eCount = events.length;
for(var i=0; i<eCount; i++){
var message=new Message;
message.load(events[i]);
client.log('detected event of type '.debug, message.type.data, message.data);
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client.trigger(
message.type,
message.data
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);
}
if(!client.config.sync){
return;
}
client.queue.next();
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}
);
}
module.exports=init;