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andrew.betts |
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// Set domain at highest level |
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var domainparts = document.domain.split("."); |
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document.domain = domainparts[domainparts.length-2]+"."+domainparts[domainparts.length-1]; |
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Function.prototype.bind = function(obj) { |
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var method = this, |
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temp = function() { |
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return method.apply(obj, arguments); |
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}; |
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return temp; |
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} |
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Function.prototype.andThen=function(g) { |
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var f=this; |
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var a=this.arguments |
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return function(args) { |
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f(a);g(args); |
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} |
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}; |
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function Meteor(instID) { |
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this.lastmsgreceived = -1; |
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this.transferDoc = false; |
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this.pingtimer = false; |
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this.updatepollfreqtimer = false; |
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this.lastrequest = 0; |
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this.recvtimes = new Array(); |
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this.MHostId = false; |
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this.callback_process = function() {}; |
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this.callback_reset = function() {}; |
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this.callback_eof = function() {}; |
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this.callback_changemode = function() {}; |
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this.persist = true; |
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// Documented public properties |
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this.channel = false; |
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this.subdomain = "data"; |
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this.dynamicpageaddress = "push"; |
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this.backtrack = 0; |
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this.smartpoll = true; |
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this.pollfreq = 2000; |
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this.minpollfreq = 2000; |
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this.mode = "stream"; |
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this.polltimeout=30000; |
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this.maxmessages=0; |
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this.pingtimeout = 10000; |
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// Set or retrieve host id. Cookie takes this form: |
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// MeteorID=123:6356353/124:098320454; |
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var MeteIds = Meteor.readCookie("MeteorID"); |
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var regex1 = new RegExp("^([0-9\:\/M]+\/)*"+instID+"\:([^\/]+)(\/[0-9\:\/M]+)*$"); |
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var regex2 = new RegExp("^([0-9\:\/M]+\/)*M\:([^\/]+)(\/[0-9\:\/M]+)*$"); |
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if (typeof(instID) == "Number" && regex1.exec(MeteIds)) { |
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this.MHostId = ma[2]; |
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} else if (typeof(instID) == "Number") { |
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this.MHostId = Math.floor(Math.random()*1000000); |
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var newcookie = (MeteIds)?MeteIds+"/":""; |
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newcookie += instID+":"+this.MHostId; |
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Meteor.createCookie("MeteorID", newcookie); |
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} else if (ma = regex2.exec(MeteIds)) { |
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this.MHostId = ma[2]; |
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} else { |
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this.MHostId = Math.floor(Math.random()*1000000); |
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var newcookie = (MeteIds)?MeteIds+"/":""; |
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newcookie += "M:"+this.MHostId; |
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Meteor.createCookie("MeteorID", newcookie); |
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} |
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this.instID = (typeof(instID) != "undefined") ? instID : 0; |
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} |
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Meteor.instances = new Array(); |
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Meteor.servertimeoffset = 0; |
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Meteor.create = function(instID) { |
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if (!instID) instID = 0; |
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Meteor.instances[instID] = new Meteor(instID); |
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return Meteor.instances[instID]; |
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} |
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Meteor.register = function(ifr) { |
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instid = new String(ifr.window.frameElement.id); |
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instid = instid.replace("meteorframe_", ""); |
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ifr.p = this.instances[instid].process.bind(this.instances[instid]); |
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ifr.r = this.instances[instid].reset.bind(this.instances[instid]); |
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ifr.eof = this.instances[instid].eof.bind(this.instances[instid]); |
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ifr.get = this.instances[instid].get.bind(this.instances[instid]); |
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ifr.increasepolldelay = this.instances[instid].increasepolldelay.bind(this.instances[instid]); |
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} |
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Meteor.setServerTime = function(timestamp) { |
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var now = new Date(); |
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var clienttime = (now.getTime() / 1000); |
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Meteor.servertimeoffset = timestamp - clienttime; |
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} |
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Meteor.prototype.start = function() { |
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this.persist = (this.maxmessages)?1:0; |
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this.smartpoll = (this.smartpoll)?1:0; |
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this.mode = (this.mode=="stream")?"stream":"poll"; |
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if (!this.subdomain || !this.channel) throw "Channel or Meteor subdomain host not specified"; |
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var now = new Date(); |
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var t = now.getTime(); |
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if (typeof(this.transferDoc)=="object") { |
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this.transferDoc.open(); |
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this.transferDoc.close(); |
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delete this.transferDoc; |
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} |
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if (document.getElementById("meteorframe_"+this.instID)) { |
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document.body.removeChild(document.getElementById("meteorframe_"+this.instID)); |
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} |
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if (this.mode=="stream") { |
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if (document.all) { |
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this.transferDoc = new ActiveXObject("htmlfile"); |
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this.transferDoc.open(); |
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this.transferDoc.write("<html>"); |
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this.transferDoc.write("<script>document.domain=\""+(document.domain)+"\";</"+"script>"); |
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this.transferDoc.write("</html>"); |
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var selfref = this; |
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this.transferDoc.parentWindow.Meteor = Meteor; |
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this.transferDoc.close(); |
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var ifrDiv = this.transferDoc.createElement("div"); |
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this.transferDoc.appendChild(ifrDiv); |
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var url = "http://"+this.subdomain+"."+location.hostname+"/"+this.dynamicpageaddress+"?channel="+this.channel+"&id="+this.MHostId; |
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if (this.lastmsgreceived >= 0) { |
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url += "&restartfrom="+this.lastmsgreceived; |
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} else if (this.backtrack > 0) { |
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url += "&backtrack="+this.backtrack; |
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} else if (this.backtrack < 0 || isNaN(this.backtrack)) { |
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url += "&restartfrom="; |
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} |
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ifrDiv.innerHTML = "<iframe id=\"meteorframe_"+this.instID+"\" src=\""+url+"&nocache="+t+"\" style=\"display: none;\"></iframe>"; |
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} else { |
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var ifr = document.createElement("IFRAME"); |
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ifr.style.width = "10px"; |
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ifr.style.height = "10px"; |
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ifr.style.border = "none"; |
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ifr.style.position = "absolute"; |
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ifr.style.top = "-10px"; |
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ifr.style.marginTop = "-10px"; |
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ifr.style.zIndex = "-20"; |
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ifr.id = "meteorframe_"+this.instID; |
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document.body.appendChild(ifr); |
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ifr.src = "http://"+this.subdomain+"."+location.hostname+"/stream.html?nocache="+t; |
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} |
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var f = this.pollmode.bind(this); |
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clearTimeout(this.pingtimer); |
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this.pingtimer = setTimeout(f, this.pingtimeout); |
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} else { |
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var ifr = document.createElement("IFRAME"); |
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ifr.style.width = "10px"; |
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ifr.style.height = "10px"; |
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ifr.style.border = "none"; |
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if (document.all) { |
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ifr.style.display = "none"; |
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} else { |
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ifr.style.position = "absolute"; |
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ifr.style.marginTop = "-10px"; |
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ifr.style.zIndex = "-20"; |
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} |
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ifr.id = "meteorframe_"+this.instID; |
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document.body.appendChild(ifr); |
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ifr.src = "http://"+this.subdomain+"."+location.hostname+"/poll.html?nocache="+t; |
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this.recvtimes[0] = t; |
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if (this.updatepollfreqtimer) clearTimeout(this.updatepollfreqtimer); |
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this.updatepollfreqtimer = setInterval(this.updatepollfreq.bind(this), 2500); |
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} |
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this.lastrequest = t; |
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} |
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Meteor.prototype.pollmode = function() { |
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this.mode="poll"; |
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this.start(); |
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this.callback_changemode("poll"); |
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} |
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Meteor.prototype.process = function(id, data) { |
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if (id > this.lastmsgreceived) { |
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this.callback_process(data); |
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if (id != -1) this.lastmsgreceived = id; |
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if (this.mode=="poll") { |
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var now = new Date(); |
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var t = now.getTime(); |
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this.recvtimes[this.recvtimes.length] = t; |
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while (this.recvtimes.length > 5) this.recvtimes.shift(); |
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} |
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} else if (id == -1) { |
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this.ping(); |
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} |
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} |
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Meteor.prototype.ping = function() { |
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if (this.mode=="stream" && this.pingtimer) { |
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clearTimeout(this.pingtimer); |
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var f = this.pollmode.bind(this); |
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this.pingtimer = setTimeout(f, this.pingtimeout); |
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var now = new Date(); |
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this.lastpingtime = now.getTime(); |
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} |
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} |
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Meteor.prototype.reset = function() { |
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var now = new Date(); |
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var t = now.getTime(); |
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var x = this.pollfreq - (t-this.lastrequest); |
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if (x < 10) x = 10; |
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this.ping(); |
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this.callback_reset(); |
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setTimeout(this.start.bind(this), x); |
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} |
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Meteor.prototype.eof = function() { |
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this.callback_eof(); |
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} |
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Meteor.prototype.get = function(varname) { |
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eval("var a = this."+varname+";"); |
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if (typeof(a) == "undefined") throw "Cannot get value of "+varname; |
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return a; |
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} |
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Meteor.prototype.increasepolldelay = function() { |
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this.pollfreq *= 2; |
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} |
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Meteor.prototype.updatepollfreq = function() { |
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if (this.smartpoll) { |
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var now = new Date(); |
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var t = now.getTime(); |
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var avg = 0; |
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for (var i=1; i<this.recvtimes.length; i++) { |
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var x = (this.recvtimes[i]-this.recvtimes[i-1]); |
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avg += (x>60000)? 60000 : x; |
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} |
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x = (t-this.recvtimes[this.recvtimes.length-1]); |
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avg += (x>180000)? 180000 : x; |
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avg /= this.recvtimes.length; |
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if ((avg/3) < this.pollfreq && (avg/3) >= this.minpollfreq) this.pollfreq = Math.ceil(this.pollfreq*0.9); |
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if ((avg/3) > this.pollfreq) this.pollfreq = Math.floor(this.pollfreq*1.05); |
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} |
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} |
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Meteor.prototype.registerEventCallback = function(evt, funcRef) { |
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if (evt=="process") { |
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this.callback_process = (this.callback_process).andThen(funcRef); |
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} else if (evt=="reset") { |
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this.callback_reset = (this.callback_reset).andThen(funcRef); |
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} else if (evt=="eof") { |
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this.callback_eof = (this.callback_eof).andThen(funcRef); |
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} else if (evt=="changemode") { |
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this.callback_changemode = (this.callback_changemode).andThen(funcRef); |
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} |
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} |
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Meteor.createCookie = function(name,value,days) { |
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if (days) { |
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var date = new Date(); |
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date.setTime(date.getTime()+(days*24*60*60*1000)); |
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var expires = "; expires="+date.toGMTString(); |
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} |
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else var expires = ""; |
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document.cookie = name+"="+value+expires+"; path=/"; |
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} |
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Meteor.readCookie = function(name) { |
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var nameEQ = name + "="; |
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var ca = document.cookie.split(';'); |
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for(var i=0;i < ca.length;i++) { |
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var c = ca[i]; |
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while (c.charAt(0)==' ') c = c.substring(1,c.length); |
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if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length); |
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} |
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return null; |
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} |
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Meteor.eraseCookie = function(name) { |
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createCookie(name,"",-1); |
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} |