improve performance & debug

libs/car.py

@@ -42,7 +42,7 @@ class Car:
         if self.status is not None:
             return self.status
         logger.error("status of %s is None", self.vin)
-        raise ValueError("status of %s is None")
+        raise ValueError("status of {} is None".format(self.vin))
 
     @classmethod
     def from_json(cls, data: dict):
@@ -82,7 +82,7 @@ class Car:
 class Cars(list):
     def __init__(self, *args):
         list.__init__(self, *args)
-        self.config_filename = "../cars.json"
+        self.config_filename = "cars.json"
 
     def get_car_by_vin(self, vin) -> Car:
         for car in self:

libs/charging.py

@@ -1,4 +1,3 @@
-import traceback
 from datetime import datetime
 from sqlite3 import IntegrityError
 
@@ -11,7 +10,7 @@ from web.db import Database
 
 
 class Charging:
-    elec_price: ElecPrice = None
+    elec_price: ElecPrice = ElecPrice(None)
 
     @staticmethod
     def get_chargings(mini=None, maxi=None) -> List[dict]:
@@ -78,6 +77,6 @@ class Charging:
 
                     Charging.update_chargings(conn, start_at, charge_date, level, co2_per_kw, consumption_kw, car.vin)
             except TypeError:
-                logger.debug("battery table is probably empty : %s", traceback.format_exc())
+                logger.debug("battery table is probably empty :", exc_info=True)
         conn.commit()
         conn.close()

libs/elec_price.py

@@ -54,14 +54,15 @@ class ElecPrice:
     def get_price(self, start, end, consumption):
         prices = []
         date = start
-        while date < end:
-            prices.append(self.get_instant_price(date))
-            date = date + timedelta(minutes=30)
-        try:
-            res = round(consumption * mean(prices), 2)
-        except TypeError:
-            logger.error("Can't get_price of charge, check config")
-            res = None
+        res = None
+        if not (start is None or end is None):
+            while date < end:
+                prices.append(self.get_instant_price(date))
+                date = date + timedelta(minutes=30)
+            try:
+                res = round(consumption * mean(prices), 2)
+            except TypeError:
+                logger.error("Can't get_price of charge, check config")
         return res
 
     def is_enable(self):