From 33229c91cb160f836eecf28d4949e519034b6339 Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Sat, 26 Mar 2022 13:53:36 +0100
Subject: [PATCH] Add fetch_trading_fees endpoint

---
 freqtrade/exchange/exchange.py  | 21 ++++++++++++
 tests/exchange/test_exchange.py | 58 +++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index e27a56aff..1d4fc8337 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -1299,6 +1299,27 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
 
+    @retrier
+    def fetch_trading_fees(self) -> Dict[str, Any]:
+        """
+        Fetch user account trading fees
+        Can be cached, should not update often.
+        """
+        if (self._config['dry_run'] or self.trading_mode != TradingMode.FUTURES
+                or not self.exchange_has('fetchTradingFees')):
+            return {}
+        try:
+            trading_fees: Dict[str, Any] = self._api.fetch_trading_fees()
+            self._log_exchange_response('fetch_trading_fees', trading_fees)
+            return trading_fees
+        except ccxt.DDoSProtection as e:
+            raise DDosProtection(e) from e
+        except (ccxt.NetworkError, ccxt.ExchangeError) as e:
+            raise TemporaryError(
+                f'Could not fetch trading fees due to {e.__class__.__name__}. Message: {e}') from e
+        except ccxt.BaseError as e:
+            raise OperationalException(e) from e
+
     @retrier
     def fetch_bids_asks(self, symbols: List[str] = None, cached: bool = False) -> Dict:
         """
diff --git a/tests/exchange/test_exchange.py b/tests/exchange/test_exchange.py
index 815ebcec2..d19baf39a 100644
--- a/tests/exchange/test_exchange.py
+++ b/tests/exchange/test_exchange.py
@@ -1624,6 +1624,64 @@ def test_fetch_positions(default_conf, mocker, exchange_name):
                            "fetch_positions", "fetch_positions")
 
 
+def test_fetch_trading_fees(default_conf, mocker):
+    api_mock = MagicMock()
+    tick = {
+        '1INCH/USDT:USDT': {
+            'info': {'user_id': '6266643',
+                     'taker_fee': '0.0018',
+                     'maker_fee': '0.0018',
+                     'gt_discount': False,
+                     'gt_taker_fee': '0',
+                     'gt_maker_fee': '0',
+                     'loan_fee': '0.18',
+                     'point_type': '1',
+                     'futures_taker_fee': '0.0005',
+                     'futures_maker_fee': '0'},
+            'symbol': '1INCH/USDT:USDT',
+            'maker': 0.0,
+            'taker': 0.0005},
+        'ETH/USDT:USDT': {
+            'info': {'user_id': '6266643',
+                     'taker_fee': '0.0018',
+                     'maker_fee': '0.0018',
+                     'gt_discount': False,
+                     'gt_taker_fee': '0',
+                     'gt_maker_fee': '0',
+                     'loan_fee': '0.18',
+                     'point_type': '1',
+                     'futures_taker_fee': '0.0005',
+                     'futures_maker_fee': '0'},
+            'symbol': 'ETH/USDT:USDT',
+            'maker': 0.0,
+            'taker': 0.0005}
+    }
+    exchange_name = 'gateio'
+    default_conf['dry_run'] = False
+    default_conf['trading_mode'] = TradingMode.FUTURES
+    default_conf['margin_mode'] = MarginMode.ISOLATED
+    api_mock.fetch_trading_fees = MagicMock(return_value=tick)
+    mocker.patch('freqtrade.exchange.Exchange.exchange_has', return_value=True)
+    exchange = get_patched_exchange(mocker, default_conf, api_mock, id=exchange_name)
+    # retrieve original ticker
+    tradingfees = exchange.fetch_trading_fees()
+
+    assert '1INCH/USDT:USDT' in tradingfees
+    assert 'ETH/USDT:USDT' in tradingfees
+    assert api_mock.fetch_trading_fees.call_count == 1
+
+    api_mock.fetch_trading_fees.reset_mock()
+
+    ccxt_exceptionhandlers(mocker, default_conf, api_mock, exchange_name,
+                           "fetch_trading_fees", "fetch_trading_fees")
+
+    api_mock.fetch_trading_fees = MagicMock(return_value={})
+    exchange = get_patched_exchange(mocker, default_conf, api_mock, id=exchange_name)
+    exchange.fetch_trading_fees()
+    mocker.patch('freqtrade.exchange.Exchange.exchange_has', return_value=True)
+    assert exchange.fetch_trading_fees() == {}
+
+
 def test_fetch_bids_asks(default_conf, mocker):
     api_mock = MagicMock()
     tick = {'ETH/BTC': {