]> git.scottworley.com Git - reliable-chat/blobdiff - webclient/rc.html
Calculate the median of the server timestamps
[reliable-chat] / webclient / rc.html
index 38129b753a61f62ac974c686bbcc08c1c33a3ac5..988f1fb558be441382764d7c8e435241309bd397 100644 (file)
 <!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>
- <link rel="stylesheet" title="Default style" href="rc.css" type="text/css"/>
- <script type="text/javascript" src="rc.js"></script>
+  <style type="text/css"><!--/*--><![CDATA[/*><!--*/
+       html, body {
+               width: 99.9%;
+               height: 100%;
+               margin: 0;
+               padding: 0;
+               background-color: #293134;
+               color: silver;
+               font-family: monospace;
+       }
+       #container {
+               height: 100%;
+       }
+       #status {
+               width: 100%;
+               text-align: right;
+               background-color: #293134;
+               padding: 5px 5px 5px 0px;
+       }
+       #client {
+               width: 98.5%;
+               padding: 0px 0px 0px 5px;
+               height: 50px;
+               position: fixed;
+               bottom: 0;
+       }
+       #input {
+               width: 100%;
+               background-color: #293134;
+       }
+       #say { width: 100% }
+       #history {
+               padding: 0px 5px 55px 5px;
+               vertical-align: bottom
+       }
+       img { width: 1px; height: 1px; }
+       iframe { display: none }
+       #status span { margin-right: 10px; }
+       #status span.sad {
+               background-color: #f00;
+               color: #fff;
+               border: 1px solid black;
+               border-radius: 5px;
+               padding-left: 5px;
+               padding-right: 5px;
+       }
+       #status span.happy {
+               background-color: #0f0;
+               color: #000;
+               border: 1px solid black;
+               border-radius: 5px;
+               padding-left: 5px;
+               padding-right: 5px;
+       }
+  /*]]>*/--></style>
+  <script type="text/javascript"><!--//--><![CDATA[//><!--
+       var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];
+
+       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 timestamp.  Median of ServerTimes
+       //   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");
+               if (nick) {
+                       return nick;
+               }
+               return 'anonymous';
+       }
+
+       function rcsetnick(new_nick) {
+               localStorage.setItem("nick", new_nick);
+       }
+
+       function rcserverbase(server) {
+               // Add the default port if server doesn't contain a port number already
+               if (server.indexOf(":") == -1) {
+                       return "http://" + server + ":21059";
+               } else {
+                       return "http://" + server;
+               }
+       }
+
+       function rcchangeserverstatus(server, new_status) {
+               var statusbar = document.getElementById("status");
+               var spans = statusbar.getElementsByTagName("span");
+               for (var i in spans) {
+                       if (spans[i].firstChild && 'data' in spans[i].firstChild && spans[i].firstChild.data == server) {
+                               spans[i].setAttribute("class", new_status);
+                       }
+               }
+       }
+
+       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) {
+               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(message.UI);
+               window.scrollTo(0, document.body.scrollHeight);
+       }
+
+       function make_seen_key(id, text) {
+               return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
+       }
+
+       function rcupdatemessagetime(message) {
+               // Set message.Time to be the median of message.ServerTimes
+               var times = [];
+               for (var i in message.ServerTimes) {
+                       times.push(message.ServerTimes[i]);
+               }
+               times.sort();
+               var middle = times.length/2;
+               if (times.length % 2) {
+                       message.Time = times[middle];
+               } else {
+                       var difference = times[middle].getTime() - times[middle-1].getTime();
+                       message.Time = new Date(times[middle-1].getTime() + difference/2);
+               }
+       }
+
+       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;
+                               rcupdatemessagetime(seen[seen_key]);
+                       } else {
+                               m.ServerTimes = {server: m.Time};
+                               seen[seen_key] = m;
+                               rcaddmessagetohistory(m);
+                               for (var i in servers) {
+                                       rcchangeserverstatus(servers[i], "sad");
+                               }
+                       }
+                       rcchangeserverstatus(server, "happy");
+               }
+       }
+
+       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() {
+               for (var i in servers) {
+                       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);
+               }
+       }
+
+       function rcsend(d, message) {
+               var id = new Date().getTime() + "-" + session + "-" + Math.random();
+               seen[make_seen_key(id, message)] = message;
+               var path = "/speak" +
+                       "?id=" + encodeURIComponent(id) +
+                       "&text=" + encodeURIComponent(message);
+               for (var i in servers) {
+                       var uri = rcserverbase(servers[i]) + path;
+                       var img = document.createElement("img");
+                       img.setAttribute("src", uri);
+                       d.appendChild(img);
+               }
+       }
+
+       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) {
+                       rcinput(document.input.say.value);
+                       document.input.say.value = "";
+                       
+               }
+       }
+  //--><!]]></script>
+
 </head>
 
-<body>
-       <table id="outer-table">
-               <tr><td id="history"></td></tr>
-               <tr><td id="status">&nbsp;</td></tr>
-               <tr><td><form name="input" onsubmit="return false"><input id="say" onkeydown="return rckeydown(event)"></input></form></td></tr>
-       </table>
+<body onload="rcconnect()">
+       <div id="container">
+               <div id="history"></div>
+               <div id="client">
+                       <div id="input">
+                               <form name="input" onsubmit="return false" autocomplete="off">
+                                       <input id="say" onkeydown="return rckeydown(event)" autocomplete="off" autofocus="autofocus"></input>
+                               </form></div>
+                       <div id="status">&nbsp;</div>
+               </div>
+       </div>
 </body>
 </html>