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/* |
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stream: xhrinteractive, iframe, serversent |
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longpoll |
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smartpoll |
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simplepoll |
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*/ |
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|
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Meteor = { |
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|
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callbacks: { |
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process: function() {}, |
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reset: function() {}, |
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eof: function() {}, |
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statuschanged: function() {}, |
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changemode: function() {} |
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}, |
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channelcount: 0, |
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channels: {}, |
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debugmode: false, |
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frameref: null, |
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host: null, |
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hostid: null, |
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maxpollfreq: 60000, |
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minpollfreq: 2000, |
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mode: "stream", |
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pingtimeout: 20000, |
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pingtimer: null, |
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pollfreq: 3000, |
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port: 80, |
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polltimeout: 30000, |
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recvtimes: [], |
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status: 0, |
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updatepollfreqtimer: null, |
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|
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register: function(ifr) { |
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ifr.p = Meteor.process; |
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ifr.r = Meteor.reset; |
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ifr.eof = Meteor.eof; |
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ifr.ch = Meteor.channelInfo; |
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clearTimeout(Meteor.frameloadtimer); |
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Meteor.setstatus(4); |
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Meteor.log("Frame registered"); |
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}, |
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|
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joinChannel: function(channelname, backtrack) { |
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if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed"; |
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Meteor.channels[channelname] = {backtrack:backtrack}; |
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Meteor.log("Joined channel "+channelname); |
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Meteor.channelcount++; |
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if (Meteor.status != 0) Meteor.connect(); |
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}, |
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|
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leaveChannel: function(channelname) { |
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if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed"; |
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delete Meteor.channels[channelname]; |
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Meteor.log("Left channel "+channelname); |
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Meteor.channelcount--; |
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if (Meteor.channelcount && Meteor.status != 0) Meteor.connect(); |
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else Meteor.disconnect(); |
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}, |
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|
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connect: function() { |
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Meteor.log("Connecting"); |
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if (!Meteor.host) throw "Meteor host not specified"; |
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if (isNaN(Meteor.port)) throw "Meteor port not specified"; |
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if (!Meteor.channelcount) throw "No channels specified"; |
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if (Meteor.status) Meteor.disconnect(); |
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Meteor.setstatus(1); |
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var now = new Date(); |
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var t = now.getTime(); |
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if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000) |
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document.domain = Meteor.extract_xss_domain(document.domain); |
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if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport(); |
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Meteor.log("Selected "+Meteor.mode+" transport"); |
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if (Meteor.mode=="xhrinteractive" || Meteor.mode=="iframe" || Meteor.mode=="serversent") { |
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if (Meteor.mode == "iframe") { |
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Meteor.loadFrame(Meteor.getSubsUrl()); |
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} else { |
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Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html"); |
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} |
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clearTimeout(Meteor.pingtimer); |
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Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout); |
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|
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} else { |
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Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html"); |
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Meteor.recvtimes[0] = t; |
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if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer); |
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if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 2500); |
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if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq; |
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} |
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Meteor.lastrequest = t; |
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}, |
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|
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disconnect: function() { |
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if (Meteor.status) { |
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clearTimeout(Meteor.pingtimer); |
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clearTimeout(Meteor.updatepollfreqtimer); |
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clearTimeout(Meteor.frameloadtimer); |
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if (typeof CollectGarbage == 'function') CollectGarbage(); |
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if (Meteor.status != 6) Meteor.setstatus(0); |
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try { |
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Meteor.frameref.open(); |
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Meteor.frameref.close(); |
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} catch (e) { |
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Meteor.frameref.parentNode.removeChild(Meteor.frameref); |
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} |
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delete Meteor.frameref; |
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Meteor.log("Disconnected"); |
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} |
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}, |
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|
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selectStreamTransport: function() { |
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try { |
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var test = ActiveXObject; |
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return "iframe"; |
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} catch (e) {} |
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if ((typeof window.addEventStream) == "function") return "iframe"; |
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return "xhrinteractive"; |
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}, |
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|
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getSubsUrl: function() { |
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var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode; |
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for (var c in Meteor.channels) { |
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surl += "/"+c; |
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if (typeof Meteor.channels[c].lastmsgreceived != 'undefined' && Meteor.channels[c].lastmsgreceived >= 0) { |
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surl += ".r"+(Meteor.channels[c].lastmsgreceived+1); |
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} else if (Meteor.channels[c].backtrack > 0) { |
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surl += ".b"+Meteor.channels[c].backtrack; |
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} else if (Meteor.channels[c].backtrack != undefined) { |
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surl += ".h"; |
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} |
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} |
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var now = new Date(); |
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surl += "?nc="+now.getTime(); |
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return surl; |
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}, |
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|
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loadFrame: function(url) { |
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try { |
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if (!Meteor.frameref) { |
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var transferDoc = new ActiveXObject("htmlfile"); |
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Meteor.frameref = transferDoc; |
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} |
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Meteor.frameref.open(); |
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Meteor.frameref.write("<html><script>"); |
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Meteor.frameref.write("document.domain=\""+(document.domain)+"\";"); |
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Meteor.frameref.write("</"+"script></html>"); |
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Meteor.frameref.parentWindow.Meteor = Meteor; |
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Meteor.frameref.close(); |
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var ifrDiv = Meteor.frameref.createElement("div"); |
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Meteor.frameref.appendChild(ifrDiv); |
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ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>"; |
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} catch (e) { |
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if (!Meteor.frameref) { |
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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.Meteor = Meteor; |
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document.body.appendChild(ifr); |
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Meteor.frameref = ifr; |
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} |
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Meteor.frameref.setAttribute("src", url); |
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} |
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Meteor.log("Loading URL '"+url+"' into frame..."); |
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Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000); |
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}, |
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|
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pollmode: function() { |
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Meteor.log("Ping timeout"); |
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Meteor.mode="smartpoll"; |
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clearTimeout(Meteor.pingtimer); |
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Meteor.callbacks["changemode"]("poll"); |
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Meteor.lastpingtime = false; |
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Meteor.connect(); |
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}, |
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|
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process: function(id, channel, data) { |
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if (id == -1) { |
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Meteor.log("Ping"); |
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Meteor.ping(); |
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} else if (typeof(Meteor.channels[channel]) != "undefined") { |
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Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data); |
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Meteor.callbacks["process"](data); |
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Meteor.channels[channel].lastmsgreceived = id; |
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if (Meteor.mode=="smartpoll") { |
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var now = new Date(); |
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Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime(); |
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while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift(); |
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} |
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} |
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Meteor.setstatus(5); |
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}, |
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|
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ping: function() { |
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if (Meteor.pingtimer) { |
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clearTimeout(Meteor.pingtimer); |
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Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout); |
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var now = new Date(); |
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Meteor.lastpingtime = now.getTime(); |
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} |
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Meteor.setstatus(5); |
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}, |
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|
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reset: function() { |
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if (Meteor.status != 6) { |
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Meteor.log("Stream reset"); |
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Meteor.ping(); |
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Meteor.callbacks["reset"](); |
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var now = new Date(); |
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var t = now.getTime(); |
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var x = Meteor.pollfreq - (t-Meteor.lastrequest); |
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if (x < 10) x = 10; |
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setTimeout(Meteor.connect, x); |
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} |
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}, |
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|
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eof: function() { |
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Meteor.log("Received end of stream, will not reconnect"); |
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Meteor.callbacks["eof"](); |
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Meteor.setstatus(6); |
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Meteor.disconnect(); |
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}, |
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|
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channelInfo: function(channel, id) { |
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Meteor.channels[channel].lastmsgreceived = id; |
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Meteor.log("Received channel info for channel "+channel+": resume from "+id); |
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}, |
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|
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updatepollfreq: function() { |
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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<Meteor.recvtimes.length; i++) { |
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avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]); |
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} |
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avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]); |
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avg /= Meteor.recvtimes.length; |
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var target = avg/2; |
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if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9); |
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if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05); |
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}, |
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|
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registerEventCallback: function(evt, funcRef) { |
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Function.prototype.andThen=function(g) { |
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var f=this; |
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var a=Meteor.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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if (typeof Meteor.callbacks[evt] == "function") { |
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Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef); |
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} else { |
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Meteor.callbacks[evt] = funcRef; |
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} |
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}, |
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|
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frameloadtimeout: function() { |
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Meteor.log("Frame load timeout"); |
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if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer); |
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Meteor.setstatus(3); |
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Meteor.pollmode(); |
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}, |
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|
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extract_xss_domain: function(old_domain) { |
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if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain; |
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domain_pieces = old_domain.split('.'); |
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return domain_pieces.slice(-2, domain_pieces.length).join("."); |
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}, |
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|
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setstatus: function(newstatus) { |
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// Statuses: 0 = Uninitialised, |
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// 1 = Loading stream, |
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// 2 = Loading controller frame, |
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// 3 = Controller frame timeout, retrying. |
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// 4 = Controller frame loaded and ready |
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// 5 = Receiving data |
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// 6 = End of stream, will not reconnect |
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|
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if (Meteor.status != newstatus) { |
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Meteor.status = newstatus; |
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Meteor.callbacks["statuschanged"](newstatus); |
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} |
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}, |
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|
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log: function(logstr) { |
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if (Meteor.debugmode) { |
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if (window.console) { |
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window.console.log(logstr); |
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} else if (document.getElementById("meteorlogoutput")) { |
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document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>"; |
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} |
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} |
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} |
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} |
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|
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var oldonunload = window.onunload; |
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if (typeof window.onunload != 'function') { |
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window.onunload = Meteor.disconnect; |
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} else { |
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window.onunload = function() { |
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if (oldonunload) oldonunload(); |
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Meteor.disconnect(); |
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} |
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} |
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