Add timeout for data fetching. [#34] MDI class fixes

lib/data_model.dart

@@ -13,6 +13,7 @@ class HassioDataModel {
   Completer _fetchCompleter;
   Completer _statesCompleter;
   Completer _servicesCompleter;
+  Timer _fetchingTimer;
 
   Map get entities => _entitiesData;
   Map get services => _servicesData;
@@ -27,10 +28,14 @@ class HassioDataModel {
     if ((_fetchCompleter != null) && (!_fetchCompleter.isCompleted)) {
       debugPrint("Previous fetch is not complited");
     } else {
+      _fetchingTimer = new Timer(new Duration(seconds: 10), () {
+        _fetchCompleter.completeError({"message": "Data fetching timeout."});
+      });
       _fetchCompleter = new Completer();
       _reConnectSocket().then((r) {
         _getData();
       }).catchError((e) {
+        _fetchingTimer.cancel();
         _fetchCompleter.completeError(e);
       });
     }
@@ -56,11 +61,14 @@ class HassioDataModel {
   _getData() {
     _getStates().then((result) {
       _getServices().then((result) {
+        _fetchingTimer.cancel();
         _fetchCompleter.complete();
       }).catchError((e) {
+        _fetchingTimer.cancel();
         _fetchCompleter.completeError(e);
       });
     }).catchError((e) {
+      _fetchingTimer.cancel();
       _fetchCompleter.completeError(e);
     });
   }
@@ -133,8 +141,6 @@ class HassioDataModel {
     }).catchError((e){
       debugPrint("Unable to connect for sending =(");
     });
-
-
   }
 
   void _parseServices(Map data) {
@@ -234,16 +240,16 @@ class HassioDataModel {
 
 class MaterialDesignIcons {
   static Map _defaultIconsByDomains = {
-    "light": 0xf335,
-    "switch": 0xf241,
-    "binary_sensor": 0xf130,
-    "group": 0xf2b1,
-    "sensor": 0xf208,
-    "automation": 0xf411,
-    "script": 0xf219,
-    "input_boolean": 0xf1de,
-    "input_datetime": 0xf953,
-    "sun": 0xf5a8
+    "light": "mdi:lightbulb",
+    "switch": "mdi:flash",
+    "binary_sensor": "mdi:checkbox-blank-circle-outline",
+    "group": "mdi:google-circles-communities",
+    "sensor": "mdi:eye",
+    "automation": "mdi:playlist-play",
+    "script": "mdi:file-document",
+    "input_boolean": "mdi:drawing",
+    "input_datetime": "mdi:clock",
+    "sun": "mdi:white-balance-sunny"
   };
   static Map _iconsDataMap = {
     "mdi:access-point": 0xf002,

lib/main.dart

@@ -77,7 +77,7 @@ class _MainPageState extends State<MainPage> {
     setState(() {
       loading = true;
     });
-    _dataModelErrorMessage = "";
+    _dataModelErrorMessage = null;
     if (_dataModel != null) {
       await _dataModel.fetch().then((result) {
         setState(() {
@@ -189,7 +189,6 @@ class _MainPageState extends State<MainPage> {
 
   List<Widget> buildSingleView(structure) {
       List<Widget> result = [];
-      if (_dataModelErrorMessage.length == 0) {
       structure["standalone"].forEach((entityId) {
         result.add(_buildCard([entityId], ""));
       });
@@ -197,10 +196,7 @@ class _MainPageState extends State<MainPage> {
         result.add(_buildCard(
             group["children"], group["friendly_name"].toString()));
       });
-      } else {
-        //TODO
-        //result.add(Text(_dataModelErrorMessage));
-      }
+
       return result;
   }
 
@@ -283,7 +279,7 @@ class _MainPageState extends State<MainPage> {
           title: _buildTitle()
         ),
         drawer: _buildAppDrawer(),
-        body: Text("Loading... or not...\n\nPlease, restart the app in case of three dots in header starts to freaking you out."),
+        body: Text(_dataModelErrorMessage != null ? "Well... no. There was an error: $_dataModelErrorMessage" : "Loading... or not..."),
         floatingActionButton: new FloatingActionButton(
           onPressed: _refreshData,
           tooltip: 'Increment',