'use strict';
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const net = require('net'),
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tls = require('tls'),
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fs = require('fs'),
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dgram = require('dgram'),
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EventParser = require('../entities/EventParser.js'),
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Message = require('js-message'),
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Events = require('event-pubsub');
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let eventParser = new EventParser();
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class Server extends Events{
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constructor(path,config,log,port){
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super();
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Object.assign(
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this,
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{
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config : config,
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path : path,
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port : port,
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udp4 : false,
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udp6 : false,
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log : log,
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server : false,
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sockets : [],
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emit : emit,
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broadcast : broadcast
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}
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);
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eventParser=new EventParser(this.config);
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this.on(
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'close',
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serverClosed.bind(this)
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);
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}
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onStart(socket){
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this.trigger(
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'start',
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socket
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);
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}
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stop(){
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this.server.close();
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}
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start(){
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if(!this.path){
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this.log('Socket Server Path not specified, refusing to start');
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return;
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}
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if(this.config.unlink){
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fs.unlink(
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this.path,
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startServer.bind(this)
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);
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}else{
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startServer.bind(this)();
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}
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}
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}
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function emit(socket, type, data){
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this.log('dispatching event to socket', ' : ', type, data);
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let message=new Message;
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message.type=type;
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message.data=data;
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if(this.config.rawBuffer){
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this.log(this.config.encoding)
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message=Buffer.from(type,this.config.encoding);
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}else{
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message=eventParser.format(message);
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}
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if(this.udp4 || this.udp6){
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if(!socket.address || !socket.port){
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this.log('Attempting to emit to a single UDP socket without supplying socket address or port. Redispatching event as broadcast to all connected sockets');
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this.broadcast(type,data);
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return;
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}
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this.server.write(
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message,
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socket
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);
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return;
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}
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socket.write(message);
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}
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function broadcast(type,data){
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this.log('broadcasting event to all known sockets listening to ', this.path,' : ', ((this.port)?this.port:''), type, data);
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let message=new Message;
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message.type=type;
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message.data=data;
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if(this.config.rawBuffer){
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message=Buffer.from(type,this.config.encoding);
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}else{
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message=eventParser.format(message);
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}
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if(this.udp4 || this.udp6){
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for(let i=1, count=this.sockets.length; i<count; i++){
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this.server.write(message,this.sockets[i]);
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}
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}else{
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for(let i=0, count=this.sockets.length; i<count; i++){
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this.sockets[i].write(message);
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}
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}
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}
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function serverClosed(){
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for(let i=0, count=this.sockets.length; i<count; i++){
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let socket=this.sockets[i];
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let destroyedSocketId=false;
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if(socket){
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if(socket.readable){
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continue;
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}
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}
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if(socket.id){
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destroyedSocketId=socket.id;
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}
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this.log('socket disconnected',destroyedSocketId.toString());
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if(socket && socket.destroy){
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socket.destroy();
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}
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this.sockets.splice(i,1);
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this.publish('socket.disconnected', socket, destroyedSocketId);
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return;
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}
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}
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function gotData(socket,data,UDPSocket){
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let sock=((this.udp4 || this.udp6)? UDPSocket : socket);
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if(this.config.rawBuffer){
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data=Buffer.from(data,this.config.encoding);
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this.publish(
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'data',
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data,
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sock
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);
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return;
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}
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if(!sock.ipcBuffer){
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sock.ipcBuffer='';
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}
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data=(sock.ipcBuffer+=data);
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if(data.slice(-1)!=eventParser.delimiter || data.indexOf(eventParser.delimiter) == -1){
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this.log('Messages are large, You may want to consider smaller messages.');
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return;
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}
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sock.ipcBuffer='';
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data=eventParser.parse(data);
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while(data.length>0){
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let message=new Message;
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message.load(data.shift());
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// Only set the sock id if it is specified.
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if (message.data && message.data.id){
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sock.id=message.data.id;
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}
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this.log('received event of : ',message.type,message.data);
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this.publish(
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message.type,
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message.data,
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sock
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);
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}
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}
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function socketClosed(socket){
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this.publish(
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'close',
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socket
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);
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}
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function serverCreated(socket) {
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this.sockets.push(socket);
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if(socket.setEncoding){
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socket.setEncoding(this.config.encoding);
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}
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this.log('## socket connection to server detected ##');
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socket.on(
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'close',
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socketClosed.bind(this)
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);
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socket.on(
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'error',
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function(err){
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this.log('server socket error',err);
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this.publish('error',err);
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}.bind(this)
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);
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socket.on(
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'data',
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gotData.bind(this,socket)
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);
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socket.on(
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'message',
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function(msg,rinfo) {
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if (!rinfo){
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return;
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}
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this.log('Received UDP message from ', rinfo.address, rinfo.port);
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let data;
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if(this.config.rawSocket){
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data=Buffer.from(msg,this.config.encoding);
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}else{
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data=msg.toString();
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}
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socket.emit('data',data,rinfo);
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}.bind(this)
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);
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this.publish(
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'connect',
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socket
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);
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if(this.config.rawBuffer){
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return;
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}
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}
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function startServer() {
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this.log(
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'starting server on ',this.path,
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((this.port)?`:${this.port}`:'')
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);
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if(!this.udp4 && !this.udp6){
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this.log('starting TLS server',this.config.tls);
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if(!this.config.tls){
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this.server=net.createServer(
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serverCreated.bind(this)
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);
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}else{
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startTLSServer.bind(this)();
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}
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}else{
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this.server=dgram.createSocket(
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((this.udp4)? 'udp4':'udp6')
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);
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this.server.write=UDPWrite.bind(this);
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this.server.on(
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'listening',
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function UDPServerStarted() {
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serverCreated.bind(this)(this.server);
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}.bind(this)
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);
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}
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this.server.on(
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'error',
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function(err){
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this.log('server error',err);
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this.publish(
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'error',
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err
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);
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}.bind(this)
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);
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this.server.maxConnections=this.config.maxConnections;
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if(!this.port){
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this.log('starting server as', 'Unix || Windows Socket');
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if (process.platform ==='win32'){
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this.path = this.path.replace(/^\//, '');
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this.path = this.path.replace(/\//g, '-');
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this.path= `\\\\.\\pipe\\${this.path}`;
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}
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this.server.listen({
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path: this.path,
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readableAll: this.config.readableAll,
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writableAll: this.config.writableAll
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}, this.onStart.bind(this));
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return;
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}
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if(!this.udp4 && !this.udp6){
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this.log('starting server as', (this.config.tls?'TLS':'TCP'));
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this.server.listen(
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this.port,
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this.path,
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this.onStart.bind(this)
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);
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return;
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}
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this.log('starting server as',((this.udp4)? 'udp4':'udp6'));
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this.server.bind(
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this.port,
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this.path
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);
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this.onStart(
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{
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address : this.path,
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port : this.port
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}
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);
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}
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function startTLSServer(){
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this.log('starting TLS server',this.config.tls);
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if(this.config.tls.private){
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this.config.tls.key=fs.readFileSync(this.config.tls.private);
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}else{
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this.config.tls.key=fs.readFileSync(`${__dirname}/../local-node-ipc-certs/private/server.key`);
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}
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if(this.config.tls.public){
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this.config.tls.cert=fs.readFileSync(this.config.tls.public);
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}else{
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this.config.tls.cert=fs.readFileSync(`${__dirname}/../local-node-ipc-certs/server.pub`);
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}
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if(this.config.tls.dhparam){
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this.config.tls.dhparam=fs.readFileSync(this.config.tls.dhparam);
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}
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if(this.config.tls.trustedConnections){
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if(typeof this.config.tls.trustedConnections === 'string'){
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this.config.tls.trustedConnections=[this.config.tls.trustedConnections];
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}
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this.config.tls.ca=[];
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for(let i=0; i<this.config.tls.trustedConnections.length; i++){
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this.config.tls.ca.push(
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fs.readFileSync(this.config.tls.trustedConnections[i])
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);
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}
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}
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this.server=tls.createServer(
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this.config.tls,
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serverCreated.bind(this)
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);
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}
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function UDPWrite(message,socket){
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let data=Buffer.from(message, this.config.encoding);
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this.server.send(
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data,
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0,
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data.length,
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socket.port,
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socket.address,
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function(err, bytes) {
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if(err){
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this.log('error writing data to socket',err);
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this.publish(
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'error',
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function(err){
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this.publish('error',err);
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}
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);
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}
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}
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);
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}
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module.exports=Server;
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