hardened calendar module

modules/calendar.js

@@ -100,16 +100,23 @@ function getData(count, cb) {
 }
 
 module.exports = function (io) {
-    io.on('connect', function (sock) {
-        sock.emit('calendar', Mustache.render(TEMPLATE, CALENDAR));
-    });
-    function update() {
+    function update(firstRunCallback) {
         getData(8, function (data) {
             CALENDAR = data;
             io.emit('calendar', Mustache.render(TEMPLATE, CALENDAR));
+            if (firstRunCallback) {
+                firstRunCallback()
+                firstRunCallback = null;
+            }
         });
     }
-    update();
+    update(function () {
+        var pushToClients = function (sock) {
+            sock.emit('calendar', Mustache.render(TEMPLATE, CALENDAR));
+        });
+        io.on('connect', pushToClients);
+        pushToClients(io);
+    });
     setInterval(update, 600000);
 }