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Feed the median-timestamp updates back into the UI
[reliable-chat] / webclient / rc.html
diff --git a/webclient/rc.html b/webclient/rc.html
index 591bd212345b9b21617117f3b7e2b393f9f46949..4137de1d2c06c8613a5ecf040bcc0c1ee5ea12c5 100644 (file)
--- a/webclient/rc.html
+++ b/webclient/rc.html
@@ -1,25 +1,97 @@
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
 <!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">
 <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[/*><!--*/
 <head>
  <title>Reliable Chat</title>
   <style type="text/css"><!--/*--><![CDATA[/*><!--*/
-       html, body, #outer-table, #history { width: 99.9%; height: 100%; margin: 0; padding: 0 }
-       #status { background-color: #eef }
+       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% }
        #say { width: 100% }
-       #history { vertical-align: bottom }
+       #history {
+               padding: 0px 5px 55px 5px;
+               vertical-align: bottom
+       }
+       .timestamp {
+               margin-right: 0.8em;
+       }
        img { width: 1px; height: 1px; }
        iframe { display: none }
        img { width: 1px; height: 1px; }
        iframe { display: none }
-       #status span { margin-right: 2em }
-       #status span.sad { background-color: #fee }
-       #status span.happy { background-color: #efe }
+       #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'];
 
   /*]]>*/--></style>
   <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
+       var history = [];  // List of messages sorted by Time
+       // 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");
 
        function rcnick() {
                var nick = localStorage.getItem("nick");
@@ -52,71 +124,154 @@
                }
        }
 
                }
        }
 
+       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) {
        function rcaddmessagetohistory(message) {
-               var d = document.createElement("div");
-               d.appendChild(document.createTextNode(message));
+               var message_i;
+               if (message.Time) {
+                       for (var i = history.length - 1; ; i--) {
+                               if (i < 0 || (history[i].Time && message.Time >= history[i].Time)) {
+                                       message_i = i+1;
+                                       history.splice(message_i, 0, message);
+                                       break;
+                               }
+                       }
+               } else {
+                       history.push(message);
+                       message_i = history.length-1;
+               }
+
+               if (!message.UI) {
+                       var timestamp_text = message.Time ? rcformattime(message.Time) : "";
+                       var timestamp = document.createElement("span");
+                       timestamp.setAttribute("class", "timestamp");
+                       timestamp.appendChild(document.createTextNode(timestamp_text));
+                       message.UI = document.createElement("div");
+                       message.UI.appendChild(timestamp);
+                       message.UI.appendChild(document.createTextNode(message.Text));
+               }
                var h = document.getElementById("history");
                var h = document.getElementById("history");
-               h.appendChild(d);
+               if (message_i + 1 < history.length) {
+                       h.insertBefore(message.UI, history[message_i + 1].UI);
+               } else {
+                       h.appendChild(message.UI);
+               }
                window.scrollTo(0, document.body.scrollHeight);
                window.scrollTo(0, document.body.scrollHeight);
-               return d;
        }
 
        function make_seen_key(id, text) {
                return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
        }
 
        }
 
        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 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();
+               if (times.length % 2) {
+                       message.Time = times[(times.length-1)/2];
+               } else {
+                       var middle = times.length/2;
+                       var difference = times[middle].getTime() - times[middle-1].getTime();
+                       message.Time = new Date(times[middle-1].getTime() + difference/2);
+               }
+
+               // This may have broken history's in-sorted-order invariant
+               var hi = history.indexOf(message);
+               if ((history[hi-1] && history[hi-1].Time > message.Time) ||
+                   (history[hi+1] && history[hi+1].Time < message.Time)) {
+                       history.splice(hi,1);
+                       rcaddmessagetohistory(message);
+               }
+
+               // Update the UI
+               var spans = message.UI.getElementsByTagName("span");
+               for (var i in spans) {
+                       if (spans[i].getAttribute && spans[i].getAttribute("class") == "timestamp") {
+                               spans[i].firstChild.data = rcformattime(message.Time);
+                       }
+               }
+       }
+
+       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 = {};
+                               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() {
        }
 
        function rcconnect() {
-               window.addEventListener("message", receiveMessageEvent, false);  
                for (var i in servers) {
                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);
                }
                        // 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) {
        }
 
        function rcsend(d, message) {
-               var id = new Date().getTime() + "-" + session + "-" + Math.random();
-               seen[make_seen_key(id, message)] = true;
+               message.ID = new Date().getTime() + "-" + session + "-" + Math.random();
+               seen[make_seen_key(message.ID, message.Text)] = message;
                var path = "/speak" +
                var path = "/speak" +
-                       "?id=" + encodeURIComponent(id) +
-                       "&text=" + encodeURIComponent(message);
+                       "?id=" + encodeURIComponent(message.ID) +
+                       "&text=" + encodeURIComponent(message.Text);
                for (var i in servers) {
                        var uri = rcserverbase(servers[i]) + path;
                        var img = document.createElement("img");
                for (var i in servers) {
                        var uri = rcserverbase(servers[i]) + path;
                        var img = document.createElement("img");
@@ -125,30 +280,29 @@
                }
        }
 
                }
        }
 
+       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, 'ServerTimes': {}};
+               rcaddmessagetohistory(m);
+               rcsend(m.UI, m);
+       }
+
        function rckeydown(event) {
                if (event.keyCode == 13) {
        function rckeydown(event) {
                if (event.keyCode == 13) {
-                       var input = document.input.say.value;
+                       rcinput(document.input.say.value);
                        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;
-                       }
-
-                       // Say the message
-                       var d = rcaddmessagetohistory(message);
-                       rcsend(d, message);
-
-                       // Remind people to set their nick
-                       if (rcnick() == 'anonymous') {
-                               rcaddmessagetohistory("-!- Set your nick with /nick");
-                       }
                }
        }
   //--><!]]></script>
                }
        }
   //--><!]]></script>
@@ -156,12 +310,15 @@
 </head>
 
 <body onload="rcconnect()">
 </head>
 
 <body onload="rcconnect()">
-       <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" autocomplete="off">
-                       <input id="say" onkeydown="return rckeydown(event)" autocomplete="off"></input>
-                       </form></td></tr>
-       </table>
+       <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>
 </body>
 </html>
Reliable Chat