Add servertime

Meteor currently added localforage twice.. #176

Author: Morten Henriksen

lib/client/ground.db.js

@@ -23,6 +23,7 @@ Ground = {};
 
 import localforage from 'localforage';
 import { ProgressCount } from './pending.jobs';
+import ServerTime from './servertime';
 
 function strId(id) {
   if (id && id._str) {

lib/client/servertime.js

@@ -0,0 +1,44 @@
+////////////////////////// GET SERVER TIME DIFFERENCE //////////////////////////
+import localforage from 'localforage';
+
+ServerTime = {};
+
+ServerTime._serverTimeDiff = 0; // Time difference in ms
+
+ServerTime.now = function() {
+  return Date.now() + ServerTime._serverTimeDiff;
+};
+
+// At server startup we figure out the time difference between server and
+// client time - this includes lag and timezone
+
+// Use the ground store to handle storage for us
+var _storage = localforage.createInstance({
+  name: 'ServerTime',
+  version: 1.0,
+});
+
+// Initialize the ServerTime._serverTimeDiff
+_storage.getItem('diff', function(err, time) {
+  if (!err) {
+
+    // Set the time
+    ServerTime._serverTimeDiff = time || 0;
+  }
+
+});
+
+// Call the server method an get server time
+// XXX: Use http call instead creating less overhead
+Meteor.call('getServerTime', function(error, result) {
+  if (!error) {
+    // Update our server time diff
+    ServerTime._serverTimeDiff = result - Date.now();// - lag or/and timezone
+    // Update the localstorage
+    _storage.setItem('diff', ServerTime._serverTimeDiff, function(/* err, result */) {
+      // XXX:
+    });
+  }
+}); // EO Server call
+
+export default ServerTime;

lib/server/ground.db.js

@@ -1,3 +1,5 @@
+import ServerTime from './servertime';
+
 Ground = {};
 
 Ground.Collection = class GroundCollection {

lib/server/servertime.js

@@ -0,0 +1,17 @@
+////////////////////////// GET SERVER TIME DIFFERENCE //////////////////////////
+
+ServerTime = {};
+
+// XXX: TODO use a http rest point instead - creates less overhead
+Meteor.methods({
+  'getServerTime': function() {
+    return Date.now();
+  }
+});
+
+// Unify client / server api
+ServerTime.now = function() {
+  return Date.now();
+};
+
+export default ServerTime;

package.js

@@ -16,7 +16,7 @@ Package.onUse(function (api) {
   api.use([
     'underscore',
     'ejson',
-    'ground:[email protected]',
+    // 'ground:[email protected]', // now embedded due to #176
     'raix:[email protected]',
   ], ['client', 'server']);