Optimize sensors update (#31)

* Optimize sensors update

* fix sensors update after first update

custom_components/grocy/__init__.py

@@ -23,7 +23,7 @@
                     REQUIRED_FILES, SHOPPING_LIST_NAME, STARTUP, STOCK_NAME,
                     VERSION)
 
-MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=300)
+MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=60)
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -172,12 +172,23 @@ def __init__(self, hass, client):
             EXPIRED_PRODUCTS_NAME : self.async_update_expired_products,
             MISSING_PRODUCTS_NAME : self.async_update_missing_products,
         }
+        self.sensor_update_dict = { STOCK_NAME : None,
+            CHORES_NAME : None,
+            SHOPPING_LIST_NAME : None,
+            EXPIRING_PRODUCTS_NAME : None,
+            EXPIRED_PRODUCTS_NAME : None,
+            MISSING_PRODUCTS_NAME : None,
+        }
 
     async def async_update_data(self, sensor_type):
         """Update data."""
-        if sensor_type in self.sensor_types_dict:
-            # This is where the main logic to update platform data goes.
-            self.hass.async_create_task(self.sensor_types_dict[sensor_type]())
+        sensor_update = self.sensor_update_dict[sensor_type]        
+        db_changed = await self.hass.async_add_executor_job(self.client.get_last_db_changed)
+        if db_changed != sensor_update:
+            self.sensor_update_dict[sensor_type] = db_changed
+            if sensor_type in self.sensor_types_dict:
+                # This is where the main logic to update platform data goes.
+                self.hass.async_create_task(self.sensor_types_dict[sensor_type]())
 
     @Throttle(MIN_TIME_BETWEEN_UPDATES)
     async def async_update_stock(self):