Add debug facilities in messaging module toggled by GET parameter

www/messaging.js

@@ -1,5 +1,7 @@
 function Messaging(screen) {
   var ws = new WebSocket('ws://' + window.location.hostname + '/play/');
+  var debug = getParameters().debug;
+  var doLog = debug != undefined && debug.match(/^(?:1|t(?:rue)?|v(?:rai)?)$/i);
   var keepAlivePeriod = 20000;
   var routes = {callbacks: [], children: {}};
 
@@ -25,6 +27,15 @@ function Messaging(screen) {
     }
   }
 
+  function getParameters() {
+    var o = {};
+    window.location.search.substr(1).split('&').forEach(function(s) {
+      var t = s.split('=');
+      o[t[0]] = t[1];
+    });
+    return o;
+  }
+
   function addEventListener(path, callback) {
     var route = get(routes, path, true);
     route.callbacks.push(callback);
@@ -44,8 +55,16 @@ function Messaging(screen) {
     } else {
       debug.textContent = event.data;
     }
+    o.direction = 'client < server';
+    log(o);
   };
 
+  function log(message) {
+    if(doLog) {
+      console.log(message);
+    }
+  }
+
   function start() {
     ping();
     addEventListener(["Pong"], ping);
@@ -54,6 +73,8 @@ function Messaging(screen) {
 
   function send(o) {
     ws.send(JSON.stringify(o));
+    o.direction = 'client > server';
+    log(o);
   }
 
   function ping() {