trunk/public_html/meteor.js

/*
stream: xhrinteractive, iframe, serversent
longpoll
smartpoll
simplepoll
*/

Meteor = {

        callbacks: {
                process: function() {},
                reset: function() {},
                eof: function() {},
                statuschanged: function() {},
                changemode: function() {}
        },
        channelcount: 0,
        channels: {},
        debugmode: false,
        frameref: null,
        host: null,
        hostid: null,
        maxpollfreq: 60000,
        minpollfreq: 2000,
        mode: "stream",
        pingtimeout: 20000,
        pingtimer: null,
        pollfreq: 5000,
        port: 80,
        polltimeout: 30000,
        recvtimes: [],
        status: 0,
        updatepollfreqtimer: null,

        register: function(ifr) {
                ifr.p = Meteor.process;
                ifr.r = Meteor.reset;
                ifr.eof = Meteor.eof;
                clearTimeout(Meteor.frameloadtimer);
                Meteor.setstatus(4);
                Meteor.log("Frame registered");
        },

        joinChannel: function(channelname, backtrack) {
                if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
                Meteor.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
                Meteor.log("Joined channel "+channelname);
                Meteor.channelcount++;
                if (Meteor.status != 0) Meteor.connect();
        },

        leaveChannel: function(channelname) {
                if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
                delete Meteor.channels[channelname];
                Meteor.log("Left channel "+channelname);
                if (Meteor.status != 0) Meteor.connect();
                Meteor.channelcount--;
        },

        connect: function() {
                Meteor.log("Connecting");
                if (!Meteor.host) throw "Meteor host not specified";
                if (isNaN(Meteor.port)) throw "Meteor port not specified";
                if (!Meteor.channelcount) throw "No channels specified";
                if (Meteor.status) Meteor.disconnect();
                Meteor.setstatus(1);
                var now = new Date();
                var t = now.getTime();
                if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
                document.domain = Meteor.extract_xss_domain(document.domain);
                if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
                Meteor.log("Selected "+Meteor.mode+" transport");
                if (Meteor.mode=="xhrinteractive" || Meteor.mode=="iframe" || Meteor.mode=="serversent") {
                        if (Meteor.mode == "iframe") {
                                Meteor.loadFrame(Meteor.getSubsUrl());
                        } else {
                                Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
                        }
                        clearTimeout(Meteor.pingtimer);
                        Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);

                } else {
                        Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
                        Meteor.recvtimes[0] = t;
                        if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
                        if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 2500);
                        if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
                }
                Meteor.lastrequest = t;
        },

        disconnect: function() {
                if (Meteor.status) {
                        if (typeof(Meteor.frameref)=="iframe") Meteor.frameref.setAttribute("src", "about:blank");
                        Meteor.frameref = null;
                        clearTimeout(Meteor.pingtimer);
                        clearTimeout(Meteor.updatepollfreqtimer);
                        clearTimeout(Meteor.frameloadtimer);
                        if (typeof CollectGarbage == 'function') CollectGarbage();
                        Meteor.setstatus(0);
                }
        },
        
        selectStreamTransport: function() {
                try {
                        var test = ActiveXObject;
                        return "iframe";
                } catch (e) {}
                if ((typeof window.addEventStream) == "function") return "iframe";
                return "xhrinteractive";
        },

        getSubsUrl: function() {
                var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
                for (var c in Meteor.channels) {
                        surl += "/"+c;
                        if (Meteor.channels[c].lastmsgreceived > 0) {
                                surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
                        } else if (Meteor.channels[c].backtrack > 0) {
                                surl += ".b"+Meteor.channels[c].backtrack;
                        } else if (Meteor.channels[c].backtrack < 0 || isNaN(Meteor.channels[c].backtrack)) {
                                surl += ".h";
                        }
                }
                return surl;
        },

        loadFrame: function(url) {
                Meteor.frameref = null;
                try {
                        var transferDoc = new ActiveXObject("htmlfile");
                        transferDoc.open();
                        transferDoc.write("<html><script>");
                        transferDoc.write("document.domain=\""+(document.domain)+"\";");
                        transferDoc.write("</"+"script></html>");
                        transferDoc.parentWindow.Meteor = Meteor;
                        transferDoc.close();
                        var ifrDiv = transferDoc.createElement("div");
                        transferDoc.appendChild(ifrDiv);
                        ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
                        Meteor.frameref = transferDoc;
                } catch (e) {
                        var ifr = document.createElement("IFRAME");
                        ifr.style.width = "10px";
                        ifr.style.height = "10px";
                        ifr.style.border = "none";
                        ifr.style.position = "absolute";
                        ifr.style.top = "-10px";
                        ifr.style.marginTop = "-10px";
                        ifr.style.zIndex = "-20";
                        ifr.Meteor = Meteor;
                        ifr.setAttribute("src", url);
                        document.body.appendChild(ifr);
                        Meteor.frameref = ifr;
                }
                Meteor.log("Loading URL '"+url+"' into frame...");
                Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
        },

        pollmode: function() {
                Meteor.log("Ping timeout");
                Meteor.mode="smartpoll";
                clearTimeout(Meteor.pingtimer);
                Meteor.connect();
                Meteor.callbacks["changemode"]("poll");
                Meteor.lastpingtime = false;
        },

        process: function(id, channel, data) {
                if (id == -1) {
                        Meteor.log("Ping");
                        Meteor.ping();
                } else if (typeof(Meteor.channels[channel]) != "undefined" && id > Meteor.channels[channel].lastmsgreceived) {
                        Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
                        Meteor.callbacks["process"](data);
                        Meteor.channels[channel].lastmsgreceived = id;
                        if (Meteor.mode=="smartpoll") {
                                var now = new Date();
                                Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
                                while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
                        }
                }
                Meteor.setstatus(5);
        },

        ping: function() {
                if (Meteor.pingtimer) {
                        clearTimeout(Meteor.pingtimer);
                        Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
                        var now = new Date();
                        Meteor.lastpingtime = now.getTime();
                }
                Meteor.setstatus(5);
        },

        reset: function() {
                Meteor.log("Stream reset");
                Meteor.ping();
                Meteor.callbacks["reset"]();
                var now = new Date();
                var t = now.getTime();
                var x = Meteor.pollfreq - (t-Meteor.lastrequest);
                if (x < 10) x = 10;
                setTimeout(Meteor.connect, x);
        },

        eof: function() {
                Meteor.callbacks["eof"]();
        },

        updatepollfreq: function() {
                var now = new Date();
                var t = now.getTime();
                var avg = 0;
                for (var i=1; i<Meteor.recvtimes.length; i++) {
                        avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
                }
                avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
                avg /= Meteor.recvtimes.length;
                var target = avg/2;
                if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
                if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
        },

        registerEventCallback: function(evt, funcRef) {
                Function.prototype.andThen=function(g) {
                        var f=this;
                        var a=Meteor.arguments
                        return function(args) {
                                f(a);g(args);
                        }
                };
                if (typeof Meteor.callbacks[evt] == "function") {
                        Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
                } else {
                        Meteor.callbacks[evt] = funcRef;
                }
        },

        frameloadtimeout: function() {
                Meteor.log("Frame load timeout");
                if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
                Meteor.setstatus(3);
                setTimeout(Meteor.connect, 5000);
        },

        extract_xss_domain: function(old_domain) {
                if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
                domain_pieces = old_domain.split('.');
                return domain_pieces.slice(-2, domain_pieces.length).join(".");
        },

        setstatus: function(newstatus) {
                // Statuses:    0 = Uninitialised,
                //                              1 = Loading stream,
                //                              2 = Loading controller frame,
                //                              3 = Controller frame timeout, retrying.
                //                              4 = Controller frame loaded and ready
                //                              5 = Receiving data

                if (Meteor.status != newstatus) {
                        Meteor.status = newstatus;
                        Meteor.callbacks["statuschanged"](newstatus);
                }
        },

        log: function(logstr) {
                if (Meteor.debugmode) {
                        if (window.console) {
                                window.console.log(logstr);
                        } else if (document.getElementById("meteorlogoutput")) {
                                document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
                        }
                }
        }
}

var oldonunload = window.onunload;
if (typeof window.onunload != 'function') {
        window.onunload = Meteor.disconnect;
} else {
        window.onunload = function() {
                if (oldonunload) oldonunload();
                Meteor.disconnect();
        }
}
1	andrew.betts	32	/*
2			stream: xhrinteractive, iframe, serversent
3			longpoll
4			smartpoll
5			simplepoll
6			*/
7
8			Meteor = {
9
10			callbacks: {
11			process: function() {},
12			reset: function() {},
13			eof: function() {},
14			statuschanged: function() {},
15			changemode: function() {}
16			},
17			channelcount: 0,
18			channels: {},
19			debugmode: false,
20			frameref: null,
21			host: null,
22			hostid: null,
23			maxpollfreq: 60000,
24			minpollfreq: 2000,
25			mode: "stream",
26			pingtimeout: 20000,
27			pingtimer: null,
28			pollfreq: 5000,
29			port: 80,
30			polltimeout: 30000,
31			recvtimes: [],
32			status: 0,
33			updatepollfreqtimer: null,
34
35			register: function(ifr) {
36			ifr.p = Meteor.process;
37			ifr.r = Meteor.reset;
38			ifr.eof = Meteor.eof;
39			clearTimeout(Meteor.frameloadtimer);
40			Meteor.setstatus(4);
41			Meteor.log("Frame registered");
42			},
43
44			joinChannel: function(channelname, backtrack) {
45			if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
46			Meteor.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
47			Meteor.log("Joined channel "+channelname);
48			Meteor.channelcount++;
49			if (Meteor.status != 0) Meteor.connect();
50			},
51
52			leaveChannel: function(channelname) {
53			if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
54			delete Meteor.channels[channelname];
55			Meteor.log("Left channel "+channelname);
56			if (Meteor.status != 0) Meteor.connect();
57			Meteor.channelcount--;
58			},
59
60			connect: function() {
61			Meteor.log("Connecting");
62			if (!Meteor.host) throw "Meteor host not specified";
63			if (isNaN(Meteor.port)) throw "Meteor port not specified";
64			if (!Meteor.channelcount) throw "No channels specified";
65			if (Meteor.status) Meteor.disconnect();
66			Meteor.setstatus(1);
67			var now = new Date();
68			var t = now.getTime();
69			if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
70			document.domain = Meteor.extract_xss_domain(document.domain);
71			if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
72			Meteor.log("Selected "+Meteor.mode+" transport");
73			if (Meteor.mode=="xhrinteractive" \|\| Meteor.mode=="iframe" \|\| Meteor.mode=="serversent") {
74			if (Meteor.mode == "iframe") {
75			Meteor.loadFrame(Meteor.getSubsUrl());
76			} else {
77			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
78			}
79			clearTimeout(Meteor.pingtimer);
80			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
81
82			} else {
83			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
84			Meteor.recvtimes[0] = t;
85			if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
86			if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 2500);
87			if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
88			}
89			Meteor.lastrequest = t;
90			},
91
92			disconnect: function() {
93			if (Meteor.status) {
94			if (typeof(Meteor.frameref)=="iframe") Meteor.frameref.setAttribute("src", "about:blank");
95			Meteor.frameref = null;
96			clearTimeout(Meteor.pingtimer);
97			clearTimeout(Meteor.updatepollfreqtimer);
98			clearTimeout(Meteor.frameloadtimer);
99			if (typeof CollectGarbage == 'function') CollectGarbage();
100			Meteor.setstatus(0);
101			}
102			},
103
104			selectStreamTransport: function() {
105			try {
106			var test = ActiveXObject;
107			return "iframe";
108			} catch (e) {}
109			if ((typeof window.addEventStream) == "function") return "iframe";
110			return "xhrinteractive";
111			},
112
113			getSubsUrl: function() {
114			var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
115			for (var c in Meteor.channels) {
116			surl += "/"+c;
117			if (Meteor.channels[c].lastmsgreceived > 0) {
118			surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
119			} else if (Meteor.channels[c].backtrack > 0) {
120			surl += ".b"+Meteor.channels[c].backtrack;
121			} else if (Meteor.channels[c].backtrack < 0 \|\| isNaN(Meteor.channels[c].backtrack)) {
122			surl += ".h";
123			}
124			}
125			return surl;
126			},
127
128			loadFrame: function(url) {
129			Meteor.frameref = null;
130			try {
131			var transferDoc = new ActiveXObject("htmlfile");
132			transferDoc.open();
133			transferDoc.write("<html><script>");
134			transferDoc.write("document.domain=\""+(document.domain)+"\";");
135			transferDoc.write("</"+"script></html>");
136			transferDoc.parentWindow.Meteor = Meteor;
137			transferDoc.close();
138			var ifrDiv = transferDoc.createElement("div");
139			transferDoc.appendChild(ifrDiv);
140			ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
141			Meteor.frameref = transferDoc;
142			} catch (e) {
143			var ifr = document.createElement("IFRAME");
144			ifr.style.width = "10px";
145			ifr.style.height = "10px";
146			ifr.style.border = "none";
147			ifr.style.position = "absolute";
148			ifr.style.top = "-10px";
149			ifr.style.marginTop = "-10px";
150			ifr.style.zIndex = "-20";
151			ifr.Meteor = Meteor;
152			ifr.setAttribute("src", url);
153			document.body.appendChild(ifr);
154			Meteor.frameref = ifr;
155			}
156			Meteor.log("Loading URL '"+url+"' into frame...");
157			Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
158			},
159
160			pollmode: function() {
161			Meteor.log("Ping timeout");
162			Meteor.mode="smartpoll";
163			clearTimeout(Meteor.pingtimer);
164			Meteor.connect();
165			Meteor.callbacks["changemode"]("poll");
166			Meteor.lastpingtime = false;
167			},
168
169			process: function(id, channel, data) {
170			if (id == -1) {
171			Meteor.log("Ping");
172			Meteor.ping();
173			} else if (typeof(Meteor.channels[channel]) != "undefined" && id > Meteor.channels[channel].lastmsgreceived) {
174			Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
175			Meteor.callbacks["process"](data);
176			Meteor.channels[channel].lastmsgreceived = id;
177			if (Meteor.mode=="smartpoll") {
178			var now = new Date();
179			Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
180			while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
181			}
182			}
183			Meteor.setstatus(5);
184			},
185
186			ping: function() {
187			if (Meteor.pingtimer) {
188			clearTimeout(Meteor.pingtimer);
189			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
190			var now = new Date();
191			Meteor.lastpingtime = now.getTime();
192			}
193			Meteor.setstatus(5);
194			},
195
196			reset: function() {
197			Meteor.log("Stream reset");
198			Meteor.ping();
199			Meteor.callbacks["reset"]();
200			var now = new Date();
201			var t = now.getTime();
202			var x = Meteor.pollfreq - (t-Meteor.lastrequest);
203			if (x < 10) x = 10;
204			setTimeout(Meteor.connect, x);
205			},
206
207			eof: function() {
208			Meteor.callbacks["eof"]();
209			},
210
211			updatepollfreq: function() {
212			var now = new Date();
213			var t = now.getTime();
214			var avg = 0;
215			for (var i=1; i<Meteor.recvtimes.length; i++) {
216			avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
217			}
218			avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
219			avg /= Meteor.recvtimes.length;
220			var target = avg/2;
221			if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
222			if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
223			},
224
225			registerEventCallback: function(evt, funcRef) {
226			Function.prototype.andThen=function(g) {
227			var f=this;
228			var a=Meteor.arguments
229			return function(args) {
230			f(a);g(args);
231			}
232			};
233			if (typeof Meteor.callbacks[evt] == "function") {
234			Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
235			} else {
236			Meteor.callbacks[evt] = funcRef;
237			}
238			},
239
240			frameloadtimeout: function() {
241			Meteor.log("Frame load timeout");
242			if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
243			Meteor.setstatus(3);
244			setTimeout(Meteor.connect, 5000);
245			},
246
247			extract_xss_domain: function(old_domain) {
248			if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
249			domain_pieces = old_domain.split('.');
250			return domain_pieces.slice(-2, domain_pieces.length).join(".");
251			},
252
253			setstatus: function(newstatus) {
254			// Statuses: 0 = Uninitialised,
255			// 1 = Loading stream,
256			// 2 = Loading controller frame,
257			// 3 = Controller frame timeout, retrying.
258			// 4 = Controller frame loaded and ready
259			// 5 = Receiving data
260
261			if (Meteor.status != newstatus) {
262			Meteor.status = newstatus;
263			Meteor.callbacks["statuschanged"](newstatus);
264			}
265			},
266
267			log: function(logstr) {
268			if (Meteor.debugmode) {
269			if (window.console) {
270			window.console.log(logstr);
271			} else if (document.getElementById("meteorlogoutput")) {
272			document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
273			}
274			}
275			}
276			}
277
278			var oldonunload = window.onunload;
279			if (typeof window.onunload != 'function') {
280			window.onunload = Meteor.disconnect;
281			} else {
282			window.onunload = function() {
283			if (oldonunload) oldonunload();
284			Meteor.disconnect();
285			}
286			}