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	/*
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	}