Added exceptions to exchange.interest_rate

freqtrade/exchange/exchange.py

@@ -1562,13 +1562,22 @@ class Exchange:
         is_short: bool
     ) -> Tuple[float, float]:
         """
+            Gets the rate of interest for borrowed currency when margin trading
             :param pair: base/quote currency pair
             :param maker_or_taker: "maker" if limit order, "taker" if market order
             :param is_short: True if requesting base interest, False if requesting quote interest
             :return: (open_interest, rollover_interest)
         """
-        # TODO-lev: implement
-        return (0.0005, 0.0005)
+        try:
+            # TODO-lev: implement, currently there is no ccxt method for this
+            return (0.0005, 0.0005)
+        except ccxt.DDoSProtection as e:
+            raise DDosProtection(e) from e
+        except (ccxt.NetworkError, ccxt.ExchangeError) as e:
+            raise TemporaryError(
+                f'Could not set leverage due to {e.__class__.__name__}. Message: {e}') from e
+        except ccxt.BaseError as e:
+            raise OperationalException(e) from e
 
     @retrier
     def fill_leverage_brackets(self):