Use a node domain per message to stabilize the server

src/node/handler/PadMessageHandler.js

@@ -35,6 +35,7 @@ var messageLogger = log4js.getLogger("message");
 var accessLogger = log4js.getLogger("access");
 var _ = require('underscore');
 var hooks = require("ep_etherpad-lite/static/js/pluginfw/hooks.js");
+var domain = require("domain");
 
 /**
  * A associative array that saves informations about a session
@@ -149,6 +150,13 @@ exports.handleMessage = function(client, message)
     return;
   }
   
+  var msgDomain = domain.create()
+  msgDomain.on('error', function(er) {
+    messageLogger.warn('Error in message:')
+    messageLogger.warn(er.stack? er.stack : er)
+    msgDomain.dispose()
+  })
+  msgDomain.run(function() {
     var handleMessageHook = function(callback){
       var dropMessage = false;
       
@@ -234,6 +242,7 @@ exports.handleMessage = function(client, message)
         finalHandler
       ]);
     }
+  });
 }