annotate nodescore.js @ 44:8fc7155aa3ac

update presentation

/*
////////////////////////////////////////////

nodescore server
nodescore.kiben.net
[e-mail]

////////////////////////////////////////////
*/
var sio = require('socket.io')
, http = require('http')
, fs = require('fs')
, static = require('node-static');
// run webserver serving static html
////////////////////////////////////////////
var clientFiles = new static.Server('./www');
var httpServer = http.createServer(
    function(request, response) {
	request.addListener('end', function () {
	    clientFiles.serve(request, response);	    
	    process.setMaxListeners(0);
	});    
    });

httpServer.listen(8889);


var pinging=0
console.log("ping set to 0")

////////////////////////////////////////////
// connect to websockets 
////////////////////////////////////////////

var io = sio.listen(httpServer)
, nicknames = {};

io.set('log level', 3); // reduce logging

io.sockets.on('connection', function (socket) {

    socket.on('nickname', function (nick, fn) {
	if (nicknames[nick]) {
	    fn(true);
	} else {
	    fn(false);
	    nicknames[nick] = socket.nickname = nick;
	    socket.broadcast.emit('announcement', nick + ' connected');
	    io.sockets.emit('nicknames', nicknames);
	}
    });  

    /// chat user messages to screens and to log file
    // date format for filename

    var da = new Date(); var dtstring = da.getFullYear()+ '-' + da.getMonth()+ '-' + da.getDate();

    ////////////////////////
    /// log messages to file
    socket.on('user message', function (msg) {
	fs.open('logs/chatlog-'+dtstring+'.txt', 'a', 666, function( e, id ) {	
	    //time format for message stamp
	    var dt = new Date();var timestring = dt.getHours() + ':' + dt.getMinutes() + ':' + dt.getSeconds();
	    
	    socket.broadcast.emit('user message', socket.nickname, msg);
	    
	    var fs = require('fs'), str = msg;
	    fs.write( id, timestring+" " + socket.nickname + ": "+ msg+"\n", null, 'utf8', function(){});
	});	
    });
    
    ////////////////////////////////////////////
    // metronome
    ////////////////////////////////////////////
    
    socket.on('metroStop', stopMetro)
    function stopMetro () {
	metroState=0;
    };
    
    ////////////////////////////////////////////
    // Chronometer
    ////////////////////////////////////////////

    // number padding: 0 to 00

    function pad(number) { return (number < 10 ? '0' : '') + number }
    
    // the chronometer initial states
    var chronstate = 0; var zecsec = 0; var seconds = 0; 
    var mins = 0; var hours = 0;
    
    var dater
    function dateTime() { 
	dater = setInterval( function () {
	    var datetime= new Date(); 
	    var now=datetime.toString()
	    socket.broadcast.emit("dateTime", now);
 	    socket.emit("dateTime", now);
	}, 1000)}
   
    clearInterval(dater);
    dateTime()
    
    function chronometer() {
	
	if (chronstate==1){
	    zecsec += 1;       // set tenths of a second
	    if(zecsec > 9) { zecsec = 0; seconds += 1;}
	    if(seconds > 59) { seconds = 0;mins += 1;}
	    if(mins > 59) { mins = 0; hours += 1; }
	    var chron = pad(hours) +":"+pad(mins)+ ':'+ pad(seconds)+ ":"+ zecsec
	    setTimeout(function(){chronometer()}, 100);
	    socket.broadcast.emit('chronFromServer', chron)
	    socket.emit('chronFromServer', chron)
	}
    }

    socket.on('startChr', function () { startChr();}); 
    // if not already started start the chronometer    
    function startChr() { if (chronstate !== 1) { 
	chronstate = 1; chronometer();} 
			}
    
    socket.on('stopChr', function () { stopChr();} );    
    function stopChr() {  chronstate = 0; }  
    // stop the chronometer
   
    socket.on('resetChr', function () { resetChr();});
    function resetChr() {//clearInterval();
			   chronstate = 0;
			   zecsec = 0; seconds = 0; 
			    mins = 0; hours = 0; 
			    chronstate = 0; 
			   var chron = pad(hours) +":"+pad(mins)+ ':'+ pad(seconds)+ ":"+ zecsec
			   // send 0.0.0 values to display
			   socket.broadcast.emit('chronFromServer', chron)
			   socket.emit('chronFromServer', chron)
			}
   
    ////////////////////////////////////////////
    // magic square sequencer
    ////////////////////////////////////////////

    var sequencerState = 0;

    var srcsqr = []
    srcsqr[0] = [22,21,24,25,06,07];
    srcsqr[1] = [20,23,27,26,05,04];
    srcsqr[2] = [03,00,17,16,35,34];
    srcsqr[3] = [01,02,19,18,33,32];

    var seqA = { metrobeat:0, voice:1, name: "A", counter: 0, mm: 60, beatsinbar: 4, durations: srcsqr[0], units: [1,2,3,1,2,4]};
    var seqB = { metrobeat:0, voice:2, name: "B", counter: 0, mm: 120, beatsinbar: 4, durations: srcsqr[1], units: [3,2,1,1,2,3]};
    var seqC = { metrobeat:0, voice:3, name: "C", counter: 0, mm: 90, beatsinbar: 4, durations: srcsqr[2], units: [4,5,6,5,4,2]};
    var seqD = { metrobeat:0, voice:4, name: "D", counter: 0, mm: 105, beatsinbar: 4, durations: srcsqr[3], units: [2,3,4,2,3,1]};
    
     var countdowntick = function(seq){

	// var tempoms = Math.floor(60000/seq.mm)
	 var tempoms = Math.floor(60000/seq.mm)
	 console.log(tempoms)
	 var timemultiplier=1
	 var outcount = 4; var incount=4;
	 var time = ((seq.durations[seq.counter]+1) *timemultiplier) + 30000 + (outcount*tempoms);
	 var time = Math.floor(time)
	 var ztime = time; 
	 var totaltime = Math.floor(time/tempoms)
	 var unit = seq.units[seq.counter];
	 
	 // initiate first page here
	 socket.broadcast.emit("pageFlipfromserver", seq.voice, unit, time, seq.mm,seq.counter);
	 socket.emit("pageFlipfromserver", seq.voice, unit, time, seq.mm,seq.counter);
	 
	 function sequenCer() {
	 //    console.log(ztime)
	     if (ztime >= 0 ){
		 
		// basic unit is still the second/1000ms - change this to tempoms? no i dont think so
		// count in and count out
		////////////////////////////////////////////
		
		 var counter = Math.floor(ztime/tempoms)
		 //console.log(counter)
		 if (counter >= 0 ){
		     socket.broadcast.emit('counterText', seq.voice, seq.counter, counter);
		     socket.emit('counterText', seq.voice, seq.counter, counter);
		     
		     if (counter <= outcount ) {              
			 socket.broadcast.emit('countinFromServer', seq.voice, counter, "","stop in: ", "red", "transparent");
		     }
		     
		     if (counter > (totaltime)-incount  && counter <= totaltime ) {
			 socket.broadcast.emit('countinFromServer', seq.voice, counter-(totaltime-incount), "","play in: ", "green","transparent");
			 socket.emit('countinFromServer', seq.voice, counter-(totaltime-incount), "","play in: ", "green","transparent");
			 
		     }
		     
		     if (counter == (totaltime)-incount ) {
			 socket.broadcast.emit('countinFromServer', seq.voice, "+", "","playing.. ", "green","transparent");
			socket.emit('countinFromServer', seq.voice, "+", "","playing.. ", "green","transparent");
		     }
		     
		     // remove displayed number with " " at end of both countin/out
		     
		     if (counter == 0 ) {
			 socket.broadcast.emit('countinFromServer', seq.voice, "", "","", "green","transparent");
			 socket.broadcast.emit('counterText', seq.voice, seq.counter, "");
			 socket.emit('counterText', seq.voice, seq.counter, "");
		     }
		 }		    
				
		 // on each beat do:
		 
		 // push out the pulse to metronome	
		 seq.metrobeat = (seq.metrobeat+1)%seq.beatsinbar ;
     		 socket.broadcast.emit('metroPulse', tempoms, seq.voice,seq.metrobeat); 
		 socket.emit('metroPulse', tempoms, seq.voice,seq.metrobeat);
	     }
	     
	     // flip the page 
	     if (counter == 0){

		 seq.counter = (seq.counter + 1) % seq.durations.length	    		
		socket.broadcast.emit("pageFlipfromserver", seq.voice, unit, time, seq.mm,seq.counter);
		 //delete tockTock;	
		 step(seq);     
	     }
	     
	     // decrement the time 
	     ztime -= tempoms
	 }
	 
	 var pulse = setInterval(sequenCer, tempoms);
	 
	 socket.on('stopSeq', function () {
	     //donaldduck = mickeymouse + 7
	     sequenCer.clearInterval
	     console.log("sequencer stopping...")	    
	     // grrr why wont this clearInterval work
	     sequencerState = 0
	     clearInterval(pulse)
	     stopChr();
	 });
     };
    
    ////////////////
    
    socket.on('startSeq', function () { 
	if (sequencerState == 0) { 
	    console.log("sequencer starting...")	    
	    startChr();

//////////////////////////////////////////////////////////////////

	    step(seqA);step(seqB); step(seqC); step(seqD);	    
	    ztime =-1;
	}
	else console.log("sequencer already started...")
    });
    
    step = function (seq) {
	//clearInterval(seq.boo);
	//clearInterval(countdowntick);
	countdowntick(seq)
	sequencerState=1;
    };
    
    socket.on('resetSeq', function () { 
	console.log("reset")
	resetChr();		
    });

    
    ////////////////////////////////////////////  
    // some latency calculations
    ///////////////////////////////////////////
    
    /*
      a ping is periodically broadcast to all connected clients each
      connected returns a pong to the server via an "emit" and in turn
      the server returns each unique client a report of the latency
      via another emit - the emit only sends to the source of the
      request, whereas the broadcast.emit..  broadcasts.. ie to all
      connected clients
      
      TODO: smooth range and average out results to remove erratic ping
      times.

      TODO:
      The result then needs to be used to stagger outgoing messages to
      compensate for latency - how much compensation is more connected
      to the time that any audio/video feed needs to encode/decode as
      the latency of the route from node A to node B is inavoidable?!
      so maybe latency is irrelevant in this context - we just need to
      stagger signals according to encoding decoding times.. hmmm
    */


// periodically broadcast a ping
    function serverTime(freq) {
	if (pinging==0){ st = setInterval(function() {
	    var pinging=1;
	    var d = new Date(); var n = d.getTime(); 
	    socket.emit("timeFromServer", n); 
	}, 1000);   } else console.log("already pinging")
    }
    // receive the pong calculate the latency and
    // return the response to the client

    socket.on("clientTimeResponse", function(x) {
	var d = new Date(); var n = d.getTime();
	var latency = (n-x)/2;
	//console.log("SERVERTIME:"+x + " LATENCY:" + latency);
	socket.emit("latencyFromServer", latency);
    });	      
    
    // this is the trigger from the control client to start the process
    // maybe remove this and have latency connections constantly running
    
    /*
      socket.on("getLatencies", function(x){
      serverTime(x);
      });
    */
    
    serverTime(1000);
    
    socket.on('disconnect', function(client) {	
	console.log(socket.nickname + " is gone..." )
	clearInterval(st);
	
	if (!socket.nickname) return;
	
	delete nicknames[socket.nickname];
	socket.broadcast.emit('announcement', socket.nickname + ' disconnected');
	socket.broadcast.emit('nicknames', nicknames);
    });

});