Add maintenance mode and update to gracefully exit process on signal

lib/config.js

@@ -78,10 +78,12 @@ function getserverurl() {
 }
 
 var version = '0.4.0';
+var maintenance = config.maintenance || false;
 var cwd = path.join(__dirname, '..');
 
 module.exports = {
     version: version,
+    maintenance: maintenance,
     debug: debug,
     urlpath: urlpath,
     port: port,

lib/realtime.js

@@ -25,7 +25,9 @@ var realtime = {
     onAuthorizeFail: onAuthorizeFail,
     secure: secure,
     connection: connection,
-    getStatus: getStatus
+    getStatus: getStatus,
+    users: users,
+    notes: notes
 };
 
 function onAuthorizeSuccess(data, accept) {
@@ -70,8 +72,9 @@ function emitCheck(note) {
 }
 
 //actions
-var users = {};
-var notes = {};
+var users, notes;
+realtime.users = users = {};
+realtime.notes = notes = {};
 //update when the note is dirty
 var updater = setInterval(function () {
     async.each(Object.keys(notes), function (key, callback) {
@@ -536,6 +539,7 @@ function ifMayEdit(socket, callback) {
 }
 
 function connection(socket) {
+    if (config.maintenance) return;
     parseNoteIdFromSocket(socket, function (err, noteId) {
         if (err) {
             return failConnection(500, err, socket);