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: 3000,
        port: 80,
        polltimeout: 30000,
        recvtimes: [],
        status: 0,
        updatepollfreqtimer: null,

        register: function(ifr) {
                ifr.p = Meteor.process;
                ifr.r = Meteor.reset;
                ifr.eof = Meteor.eof;
                ifr.ch = Meteor.channelInfo;
                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) {
                        clearTimeout(Meteor.pingtimer);
                        clearTimeout(Meteor.updatepollfreqtimer);
                        clearTimeout(Meteor.frameloadtimer);
                        if (typeof CollectGarbage == 'function') CollectGarbage();
                        if (Meteor.status != 6) Meteor.setstatus(0);
                        Meteor.log("Disconnected");
                }
        },
        
        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";
                        }
                }
                var now = new Date();
                surl += "?nc="+now.getTime();
                return surl;
        },

        loadFrame: function(url) {
                try {
                        if (!Meteor.frameref) {
                                var transferDoc = new ActiveXObject("htmlfile");
                                Meteor.frameref = transferDoc;
                        }
                        Meteor.frameref.open();
                        Meteor.frameref.write("<html><script>");
                        Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
                        Meteor.frameref.write("</"+"script></html>");
                        Meteor.frameref.parentWindow.Meteor = Meteor;
                        Meteor.frameref.close();
                        var ifrDiv = Meteor.frameref.createElement("div");
                        Meteor.frameref.appendChild(ifrDiv);
                        ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
                } catch (e) {
                        if (!Meteor.frameref) {
                                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;
                                document.body.appendChild(ifr);
                                Meteor.frameref = ifr;
                        }
                        Meteor.frameref.setAttribute("src", url);
                }
                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.callbacks["changemode"]("poll");
                Meteor.lastpingtime = false;
                Meteor.connect();
        },

        process: function(id, channel, data) {
                if (id == -1) {
                        Meteor.log("Ping");
                        Meteor.ping();
                } else if (typeof(Meteor.channels[channel]) != "undefined") {
                        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() {
                if (Meteor.status != 6) {
                        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.log("Received end of stream, will not reconnect");
                Meteor.callbacks["eof"]();
                Meteor.setstatus(6);
                Meteor.disconnect();
        },

        channelInfo: function(channel, id) {
                Meteor.channels[channel].lastmsgreceived = id;
                Meteor.log("Received channel info for channel "+channel+": resume from "+id);
        },

        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);
                Meteor.pollmode();
        },

        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
                //                              6 = End of stream, will not reconnect

                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	andrew.betts	39	pollfreq: 3000,
29	andrew.betts	32	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	andrew.betts	53	ifr.ch = Meteor.channelInfo;
40	andrew.betts	32	clearTimeout(Meteor.frameloadtimer);
41			Meteor.setstatus(4);
42			Meteor.log("Frame registered");
43			},
44
45			joinChannel: function(channelname, backtrack) {
46			if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
47			Meteor.channels[channelname] = {backtrack:backtrack, lastmsgreceived:0};
48			Meteor.log("Joined channel "+channelname);
49			Meteor.channelcount++;
50			if (Meteor.status != 0) Meteor.connect();
51			},
52
53			leaveChannel: function(channelname) {
54			if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
55			delete Meteor.channels[channelname];
56			Meteor.log("Left channel "+channelname);
57			if (Meteor.status != 0) Meteor.connect();
58			Meteor.channelcount--;
59			},
60
61			connect: function() {
62			Meteor.log("Connecting");
63			if (!Meteor.host) throw "Meteor host not specified";
64			if (isNaN(Meteor.port)) throw "Meteor port not specified";
65			if (!Meteor.channelcount) throw "No channels specified";
66			if (Meteor.status) Meteor.disconnect();
67			Meteor.setstatus(1);
68			var now = new Date();
69			var t = now.getTime();
70			if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
71			document.domain = Meteor.extract_xss_domain(document.domain);
72			if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
73			Meteor.log("Selected "+Meteor.mode+" transport");
74			if (Meteor.mode=="xhrinteractive" \|\| Meteor.mode=="iframe" \|\| Meteor.mode=="serversent") {
75			if (Meteor.mode == "iframe") {
76			Meteor.loadFrame(Meteor.getSubsUrl());
77			} else {
78			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
79			}
80			clearTimeout(Meteor.pingtimer);
81			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
82
83			} else {
84			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
85			Meteor.recvtimes[0] = t;
86			if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
87			if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 2500);
88			if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
89			}
90			Meteor.lastrequest = t;
91			},
92
93			disconnect: function() {
94			if (Meteor.status) {
95			clearTimeout(Meteor.pingtimer);
96			clearTimeout(Meteor.updatepollfreqtimer);
97			clearTimeout(Meteor.frameloadtimer);
98			if (typeof CollectGarbage == 'function') CollectGarbage();
99	andrew.betts	55	if (Meteor.status != 6) Meteor.setstatus(0);
100			Meteor.log("Disconnected");
101	andrew.betts	32	}
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	andrew.betts	55	var now = new Date();
126			surl += "?nc="+now.getTime();
127	andrew.betts	32	return surl;
128			},
129
130			loadFrame: function(url) {
131			try {
132	andrew.betts	39	if (!Meteor.frameref) {
133			var transferDoc = new ActiveXObject("htmlfile");
134			Meteor.frameref = transferDoc;
135			}
136			Meteor.frameref.open();
137			Meteor.frameref.write("<html><script>");
138			Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
139			Meteor.frameref.write("</"+"script></html>");
140			Meteor.frameref.parentWindow.Meteor = Meteor;
141			Meteor.frameref.close();
142			var ifrDiv = Meteor.frameref.createElement("div");
143			Meteor.frameref.appendChild(ifrDiv);
144	andrew.betts	32	ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
145			} catch (e) {
146	andrew.betts	39	if (!Meteor.frameref) {
147			var ifr = document.createElement("IFRAME");
148			ifr.style.width = "10px";
149			ifr.style.height = "10px";
150			ifr.style.border = "none";
151			ifr.style.position = "absolute";
152			ifr.style.top = "-10px";
153			ifr.style.marginTop = "-10px";
154			ifr.style.zIndex = "-20";
155			ifr.Meteor = Meteor;
156			document.body.appendChild(ifr);
157			Meteor.frameref = ifr;
158			}
159			Meteor.frameref.setAttribute("src", url);
160	andrew.betts	32	}
161			Meteor.log("Loading URL '"+url+"' into frame...");
162			Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
163			},
164
165			pollmode: function() {
166			Meteor.log("Ping timeout");
167	andrew.betts	40	Meteor.mode="smartpoll";
168	andrew.betts	32	clearTimeout(Meteor.pingtimer);
169			Meteor.callbacks["changemode"]("poll");
170			Meteor.lastpingtime = false;
171	andrew.betts	53	Meteor.connect();
172	andrew.betts	32	},
173
174			process: function(id, channel, data) {
175			if (id == -1) {
176			Meteor.log("Ping");
177			Meteor.ping();
178	andrew.betts	53	} else if (typeof(Meteor.channels[channel]) != "undefined") {
179	andrew.betts	32	Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
180			Meteor.callbacks["process"](data);
181			Meteor.channels[channel].lastmsgreceived = id;
182			if (Meteor.mode=="smartpoll") {
183			var now = new Date();
184			Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
185			while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
186			}
187			}
188			Meteor.setstatus(5);
189			},
190
191			ping: function() {
192			if (Meteor.pingtimer) {
193			clearTimeout(Meteor.pingtimer);
194			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
195			var now = new Date();
196			Meteor.lastpingtime = now.getTime();
197			}
198			Meteor.setstatus(5);
199			},
200
201			reset: function() {
202	andrew.betts	55	if (Meteor.status != 6) {
203			Meteor.log("Stream reset");
204			Meteor.ping();
205			Meteor.callbacks["reset"]();
206			var now = new Date();
207			var t = now.getTime();
208			var x = Meteor.pollfreq - (t-Meteor.lastrequest);
209			if (x < 10) x = 10;
210			setTimeout(Meteor.connect, x);
211			}
212	andrew.betts	32	},
213
214			eof: function() {
215	andrew.betts	55	Meteor.log("Received end of stream, will not reconnect");
216	andrew.betts	32	Meteor.callbacks["eof"]();
217	andrew.betts	55	Meteor.setstatus(6);
218	andrew.betts	53	Meteor.disconnect();
219	andrew.betts	32	},
220
221	andrew.betts	53	channelInfo: function(channel, id) {
222			Meteor.channels[channel].lastmsgreceived = id;
223			Meteor.log("Received channel info for channel "+channel+": resume from "+id);
224			},
225
226	andrew.betts	32	updatepollfreq: function() {
227			var now = new Date();
228			var t = now.getTime();
229			var avg = 0;
230			for (var i=1; i<Meteor.recvtimes.length; i++) {
231			avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
232			}
233			avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
234			avg /= Meteor.recvtimes.length;
235			var target = avg/2;
236			if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
237			if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
238			},
239
240			registerEventCallback: function(evt, funcRef) {
241			Function.prototype.andThen=function(g) {
242			var f=this;
243			var a=Meteor.arguments
244			return function(args) {
245			f(a);g(args);
246			}
247			};
248			if (typeof Meteor.callbacks[evt] == "function") {
249			Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
250			} else {
251			Meteor.callbacks[evt] = funcRef;
252			}
253			},
254
255			frameloadtimeout: function() {
256			Meteor.log("Frame load timeout");
257			if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
258			Meteor.setstatus(3);
259	andrew.betts	53	Meteor.pollmode();
260	andrew.betts	32	},
261
262			extract_xss_domain: function(old_domain) {
263			if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
264			domain_pieces = old_domain.split('.');
265			return domain_pieces.slice(-2, domain_pieces.length).join(".");
266			},
267
268			setstatus: function(newstatus) {
269			// Statuses: 0 = Uninitialised,
270			// 1 = Loading stream,
271			// 2 = Loading controller frame,
272			// 3 = Controller frame timeout, retrying.
273			// 4 = Controller frame loaded and ready
274			// 5 = Receiving data
275	andrew.betts	55	// 6 = End of stream, will not reconnect
276	andrew.betts	32
277			if (Meteor.status != newstatus) {
278			Meteor.status = newstatus;
279			Meteor.callbacks["statuschanged"](newstatus);
280			}
281			},
282
283			log: function(logstr) {
284			if (Meteor.debugmode) {
285			if (window.console) {
286			window.console.log(logstr);
287			} else if (document.getElementById("meteorlogoutput")) {
288			document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
289			}
290			}
291			}
292			}
293
294			var oldonunload = window.onunload;
295			if (typeof window.onunload != 'function') {
296			window.onunload = Meteor.disconnect;
297			} else {
298			window.onunload = function() {
299			if (oldonunload) oldonunload();
300			Meteor.disconnect();
301			}
302			}