Add prep functions to exchange

freqtrade/exchange/binance.py

@@ -1,6 +1,6 @@
 """ Binance exchange subclass """
 import logging
-from typing import Dict
+from typing import Dict, Optional
 
 import ccxt
 
@@ -90,3 +90,104 @@ class Binance(Exchange):
                 f'Could not place sell order due to {e.__class__.__name__}. Message: {e}') from e
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
+
+    def transfer(self, asset: str, amount: float, frm: str, to: str, pair: Optional[str]):
+        res = self._api.sapi_post_margin_isolated_transfer({
+            "asset": asset,
+            "amount": amount,
+            "transFrom": frm,
+            "transTo": to,
+            "symbol": pair
+        })
+        logger.info(f"Transfer response: {res}")
+
+    def borrow(self, asset: str, amount: float, pair: str):
+        res = self._api.sapi_post_margin_loan({
+            "asset": asset,
+            "isIsolated": True,
+            "symbol": pair,
+            "amount": amount
+        })  # borrow from binance
+        logger.info(f"Borrow response: {res}")
+
+    def repay(self, asset: str, amount: float, pair: str):
+        res = self._api.sapi_post_margin_repay({
+            "asset": asset,
+            "isIsolated": True,
+            "symbol": pair,
+            "amount": amount
+        })  # borrow from binance
+        logger.info(f"Borrow response: {res}")
+
+    def setup_leveraged_enter(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        if not quote_currency or not is_short:
+            raise OperationalException(
+                "quote_currency and is_short are required arguments to setup_leveraged_enter"
+                " when trading with leverage on binance"
+            )
+        open_rate = 2  # TODO-mg: get the real open_rate, or real stake_amount
+        stake_amount = amount * open_rate
+        if is_short:
+            borrowed = stake_amount * ((leverage-1)/leverage)
+        else:
+            borrowed = amount
+
+        self.transfer(  # Transfer to isolated margin
+            asset=quote_currency,
+            amount=stake_amount,
+            frm='SPOT',
+            to='ISOLATED_MARGIN',
+            pair=pair
+        )
+
+        self.borrow(
+            asset=quote_currency,
+            amount=borrowed,
+            pair=pair
+        )  # borrow from binance
+
+    def complete_leveraged_exit(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+
+        if not quote_currency or not is_short:
+            raise OperationalException(
+                "quote_currency and is_short are required arguments to setup_leveraged_enter"
+                " when trading with leverage on binance"
+            )
+
+        open_rate = 2  # TODO-mg: get the real open_rate, or real stake_amount
+        stake_amount = amount * open_rate
+        if is_short:
+            borrowed = stake_amount * ((leverage-1)/leverage)
+        else:
+            borrowed = amount
+
+        self.repay(
+            asset=quote_currency,
+            amount=borrowed,
+            pair=pair
+        )  # repay binance
+
+        self.transfer(  # Transfer to isolated margin
+            asset=quote_currency,
+            amount=stake_amount,
+            frm='ISOLATED_MARGIN',
+            to='SPOT',
+            pair=pair
+        )
+
+    def apply_leverage_to_stake_amount(self, stake_amount: float, leverage: float):
+        return stake_amount / leverage

freqtrade/exchange/bittrex.py

@@ -1,8 +1,9 @@
 """ Bittrex exchange subclass """
 import logging
-from typing import Dict
+from typing import Dict, Optional
 
 from freqtrade.exchange import Exchange
+from freqtrade.exceptions import OperationalException
 
 
 logger = logging.getLogger(__name__)
@@ -23,3 +24,23 @@ class Bittrex(Exchange):
         },
         "l2_limit_range": [1, 25, 500],
     }
+
+    def setup_leveraged_enter(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        raise OperationalException("Bittrex does not support leveraged trading")
+
+    def complete_leveraged_exit(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        raise OperationalException("Bittrex does not support leveraged trading")

freqtrade/exchange/exchange.py

@@ -189,6 +189,7 @@ class Exchange:
             'secret': exchange_config.get('secret'),
             'password': exchange_config.get('password'),
             'uid': exchange_config.get('uid', ''),
+            'options': exchange_config.get('options', {})
         }
         if ccxt_kwargs:
             logger.info('Applying additional ccxt config: %s', ccxt_kwargs)
@@ -540,8 +541,9 @@ class Exchange:
         else:
             return 1 / pow(10, precision)
 
-    def get_min_pair_stake_amount(self, pair: str, price: float,
-                                  stoploss: float) -> Optional[float]:
+    def get_min_pair_stake_amount(self, pair: str, price: float, stoploss: float,
+                                  leverage: Optional[float] = 1.0) -> Optional[float]:
+        # TODO-mg: Using leverage makes the min stake amount lower (on binance at least)
         try:
             market = self.markets[pair]
         except KeyError:
@@ -575,7 +577,20 @@ class Exchange:
         # The value returned should satisfy both limits: for amount (base currency) and
         # for cost (quote, stake currency), so max() is used here.
         # See also #2575 at github.
-        return max(min_stake_amounts) * amount_reserve_percent
+        return self.apply_leverage_to_stake_amount(
+            max(min_stake_amounts) * amount_reserve_percent,
+            leverage or 1.0
+        )
+
+    def apply_leverage_to_stake_amount(self, stake_amount: float, leverage: float):
+        """
+        #* Should be implemented by child classes if leverage affects the stake_amount
+        Takes the minimum stake amount for a pair with no leverage and returns the minimum
+        stake amount when leverage is considered
+        :param stake_amount: The stake amount for a pair before leverage is considered
+        :param leverage: The amount of leverage being used on the current trade
+        """
+        return stake_amount
 
     # Dry-run methods
 
@@ -713,6 +728,15 @@ class Exchange:
             raise InvalidOrderException(
                 f'Tried to get an invalid dry-run-order (id: {order_id}). Message: {e}') from e
 
+    def get_max_leverage(self, pair: str, stake_amount: float, price: float) -> float:
+        """
+        Gets the maximum leverage available on this pair that is below the config leverage
+        but higher than the config min_leverage
+        """
+
+        raise OperationalException(f"Leverage is not available on {self.name} using freqtrade")
+        return 1.0
+
     # Order handling
 
     def create_order(self, pair: str, ordertype: str, side: str, amount: float,
@@ -737,6 +761,7 @@ class Exchange:
             order = self._api.create_order(pair, ordertype, side,
                                            amount, rate_for_order, params)
             self._log_exchange_response('create_order', order)
+
             return order
 
         except ccxt.InsufficientFunds as e:
@@ -757,6 +782,26 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
 
+    def setup_leveraged_enter(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        raise OperationalException(f"Leverage is not available on {self.name} using freqtrade")
+
+    def complete_leveraged_exit(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        raise OperationalException(f"Leverage is not available on {self.name} using freqtrade")
+
     def stoploss_adjust(self, stop_loss: float, order: Dict) -> bool:
         """
         Verify stop_loss against stoploss-order value (limit or price)
@@ -1525,6 +1570,9 @@ class Exchange:
             self._async_get_trade_history(pair=pair, since=since,
                                           until=until, from_id=from_id))
 
+    def transfer(self, asset: str, amount: float, frm: str, to: str, pair: Optional[str]):
+        self._api.transfer(asset, amount, frm, to)
+
 
 def is_exchange_known_ccxt(exchange_name: str, ccxt_module: CcxtModuleType = None) -> bool:
     return exchange_name in ccxt_exchanges(ccxt_module)

freqtrade/exchange/kraken.py

@@ -1,6 +1,6 @@
 """ Kraken exchange subclass """
 import logging
-from typing import Any, Dict
+from typing import Any, Dict, Optional
 
 import ccxt
 
@@ -124,3 +124,23 @@ class Kraken(Exchange):
                 f'Could not place sell order due to {e.__class__.__name__}. Message: {e}') from e
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
+
+    def setup_leveraged_enter(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        return
+
+    def complete_leveraged_exit(
+        self,
+        pair: str,
+        leverage: float,
+        amount: float,
+        quote_currency: Optional[str],
+        is_short: Optional[bool]
+    ):
+        return