Show app disk usage in storage tab

src/views/app.js

@@ -52,6 +52,8 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
     $scope.groups = [];
     $scope.users = [];
     $scope.backupConfig = null;
+    $scope.diskUsage = 0;
+    $scope.diskUsageDate = 0;
 
     $scope.APP_TYPES = APP_TYPES;
     $scope.HOST_PORT_MIN = 1;
@@ -1931,6 +1933,28 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
         });
     }
 
+    function fetchDiskUsage(callback) {
+        $scope.diskUsage = 0;
+
+        Client.diskUsage(function (error, result) {
+            if (error) return callback(error);
+
+            $scope.diskUsageDate = result.usage.ts;
+
+            for (var diskName in result.usage.disks) {
+                var disk = result.usage.disks[diskName];
+                var content =  disk.contents.find(function (c) { return c.id === appId; });
+
+                if (content) {
+                    $scope.diskUsage = content.usage;
+                    break;
+                }
+            }
+
+            callback();
+        });
+    }
+
     function getDomains(callback) {
         Client.getDomains(function (error, result) {
             if (error) return callback(error);
@@ -2075,6 +2099,7 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
             async.series([
                 fetchUsers,
                 fetchGroups,
+                fetchDiskUsage,
                 getDomains,
                 getVolumes,
                 getBackupConfig