<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
-
<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+ reliable-chat - multipath chat
+ Copyright (C) 2012 Scott Worley <sworley@chkno.net>
+ Copyright (C) 2012 Jason Hibbs <skitch@gmail.com>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+-->
<head>
<title>Reliable Chat</title>
<style type="text/css"><!--/*--><![CDATA[/*><!--*/
<script type="text/javascript"><!--//--><![CDATA[//><!--
var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];
- var session = Math.random();
- var seen = {};
+ var session = Math.random(); // For outgoing message IDs
+ var since = {}; // server -> time: For fetch?since=
+ var seen = {}; // seen_key -> message
+ // Messages have these fields:
+ // Time: The server timestamp of the first copy to arrive
+ // ID: Some unique string for deduping
+ // Text: The text of the message
+ // ServerTimes: server -> timestamp
+ // UI: The DOM node for this message in the UI
function rcnick() {
var nick = localStorage.getItem("nick");
}
}
+ function rcformattime(t) {
+ var d = t.getDay();
+ d = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][d];
+ var h = t.getHours();
+ var m = t.getMinutes();
+ var s = t.getSeconds();
+ function pad(x) {
+ return (x < 10 ? "0" : "") + x;
+ }
+ return d + " " + pad(h) + ":" + pad(m) + ":" + pad(s);
+ }
+
function rcaddmessagetohistory(message) {
- var d = document.createElement("div");
- d.appendChild(document.createTextNode(message));
+ message.UI = document.createElement("div");
+ var text = (message.Time ? rcformattime(message.Time) : "") + " " + message.Text;
+ message.UI.appendChild(document.createTextNode(text));
var h = document.getElementById("history");
- h.appendChild(d);
+ h.appendChild(message.UI);
window.scrollTo(0, document.body.scrollHeight);
- return d;
}
function make_seen_key(id, text) {
return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
}
- function receiveMessage(server, time, id, text) {
- var seen_key = make_seen_key(id, text);
- if (!(seen_key in seen)) {
- seen[seen_key] = true;
- rcaddmessagetohistory(text);
- for (var i in servers) {
- rcchangeserverstatus(servers[i], "sad");
+ function rcreceivemessages(server, messages) {
+ for (var i in messages) {
+ var m = messages[i];
+ m.Time = new Date(m.Time);
+ var seen_key = make_seen_key(m.ID, m.Text);
+ if (seen_key in seen) {
+ seen[seen_key].ServerTimes[server] = m.Time;
+ } else {
+ m.ServerTimes = {server: m.Time};
+ seen[seen_key] = m;
+ rcaddmessagetohistory(m);
+ for (var i in servers) {
+ rcchangeserverstatus(servers[i], "sad");
+ }
}
+ rcchangeserverstatus(server, "happy");
}
- rcchangeserverstatus(server, "happy");
}
- function receiveMessageEvent(event)
- {
- for (var i in servers) {
- if (event.origin === rcserverbase(servers[i])) {
- messages = JSON.parse(event.data);
- for (var j in messages) {
- if ('Time' in messages[j] &&
- 'ID' in messages[j] &&
- 'Text' in messages[j]) {
- receiveMessage(servers[i], messages[j]['Time'], messages[j]['ID'], messages[j]['Text']);
+ function rcfetch(server) {
+ var delay = 10000; // TODO: Exponential backoff
+ var xhr = new XMLHttpRequest();
+ xhr.onreadystatechange = function() {
+ if (this.readyState == this.DONE) {
+ if (this.status == 200) {
+ var rtxt = this.responseText;
+ if (rtxt != null) {
+ var messages = JSON.parse(rtxt);
+ if (messages != null) {
+ delay = 40;
+ if (messages.length >= 1 && "Time" in messages[messages.length-1]) {
+ since[server] = messages[messages.length-1].Time;
+ }
+ rcreceivemessages(server, messages);
+ }
}
}
+ window.setTimeout(rcfetch, delay, server);
}
}
+ var uri = rcserverbase(server) + "/fetch";
+ if (server in since) {
+ uri += '?since="' + since[server] + '"';
+ }
+ xhr.open("GET", uri);
+ xhr.send();
}
function rcconnect() {
- window.addEventListener("message", receiveMessageEvent, false);
for (var i in servers) {
- // Create a hidden iframe for same-origin workaround
- var iframe = document.createElement("iframe");
- iframe.setAttribute("src", rcserverbase(servers[i]) + "/frame");
- document.body.insertBefore(iframe, document.body.firstChild);
+ rcfetch(servers[i]);
// Status bar entry
var status_indicator = document.createElement("span");
status_indicator.appendChild(document.createTextNode(servers[i]));
status_indicator.setAttribute("class", "sad");
document.getElementById("status").appendChild(status_indicator);
}
- if (rcnick() == 'anonymous') {
- rcaddmessagetohistory("-!- Set your nick with /nick");
- }
}
function rcsend(d, message) {
var id = new Date().getTime() + "-" + session + "-" + Math.random();
- seen[make_seen_key(id, message)] = true;
+ seen[make_seen_key(id, message)] = message;
var path = "/speak" +
"?id=" + encodeURIComponent(id) +
"&text=" + encodeURIComponent(message);
}
}
+ function rcinput(input) {
+ var message;
+ var re = /^\/([a-z]+) (.*)/
+ var match = re.exec(input);
+ if (match && match[1] == 'me') {
+ message = "* " + rcnick() + " " + match[2];
+ } else if (match && match[1] == 'nick') {
+ message = "*** " + rcnick() + " is now known as " + match[2];
+ rcsetnick(match[2]);
+ } else {
+ message = "<" + rcnick() + "> " + input;
+ }
+
+ var m = {'Text': message};
+ rcaddmessagetohistory(m);
+ rcsend(m.UI, m);
+ }
+
function rckeydown(event) {
if (event.keyCode == 13) {
- var input = document.input.say.value;
+ rcinput(document.input.say.value);
document.input.say.value = "";
- // Check nick change
- var message;
- var re = /^\/nick (.*)/;
- var match = re.exec(input);
- if (match) {
- message = "*** " + rcnick() + " is now known as " + match[1];
- rcsetnick(match[1]);
- } else {
- message = "<" + rcnick() + "> " + input;
- }
-
- // /me support
- var message;
- var re = /^\/me (.*)/;
- var match = re.exec(input);
- var inputme = input.substring(4);
- if (match) {
- message = "* " + rcnick() + " " + inputme;
- } else {
- message = "<" + rcnick() + "> " + input;
- }
-
- // Remind people to set their nick
- if (rcnick() == 'anonymous') {
- rcaddmessagetohistory("-!- Set your nick with /nick");
- }
-
- // Say the message
- var d = rcaddmessagetohistory(message);
- rcsend(d, message);
}
}
//--><!]]></script>
projects / reliable-chat / blobdiff