Added exceptions to exchange.interest_rate

freqtrade/exchange/exchange.py

@@ -1529,13 +1529,22 @@ 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):

tests/exchange/test_exchange.py

@@ -2980,6 +2980,30 @@ def test_get_interest_rate(
         pair, maker_or_taker, is_short) == (borrow_rate, interest_rate)
 
 
+@pytest.mark.parametrize("exchange_name", [("binance"), ("ftx"), ("kraken")])
+@pytest.mark.parametrize("maker_or_taker", [("maker"), ("taker")])
+@pytest.mark.parametrize("is_short", [(True), (False)])
+def test_get_interest_rate_exceptions(mocker, default_conf, exchange_name, maker_or_taker, is_short):
+
+    # api_mock = MagicMock()
+    # # TODO-lev: get_interest_rate currently not implemented on CCXT, so this may need to be renamed
+    # api_mock.get_interest_rate = MagicMock()
+    # type(api_mock).has = PropertyMock(return_value={'getInterestRate': True})
+
+    # ccxt_exceptionhandlers(
+    #     mocker,
+    #     default_conf,
+    #     api_mock,
+    #     exchange_name,
+    #     "get_interest_rate",
+    #     "get_interest_rate",
+    #     pair="XRP/USDT",
+    #     is_short=is_short,
+    #     maker_or_taker="maker_or_taker"
+    # )
+    return
+
+
 @pytest.mark.parametrize("collateral", [
     (Collateral.CROSS),
     (Collateral.ISOLATED)