143 lines
5.6 KiB
Python
143 lines
5.6 KiB
Python
""" Binance exchange subclass """
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import logging
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from typing import Dict, Optional
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import ccxt
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from freqtrade.exceptions import (DDosProtection, InsufficientFundsError, InvalidOrderException,
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OperationalException, TemporaryError)
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from freqtrade.exchange import Exchange
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from freqtrade.exchange.common import retrier
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logger = logging.getLogger(__name__)
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class Binance(Exchange):
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_ft_has: Dict = {
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"stoploss_on_exchange": True,
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"order_time_in_force": ['gtc', 'fok', 'ioc'],
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"ohlcv_candle_limit": 1000,
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"trades_pagination": "id",
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"trades_pagination_arg": "fromId",
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"l2_limit_range": [5, 10, 20, 50, 100, 500, 1000],
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}
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def stoploss_adjust(self, stop_loss: float, order: Dict, side: str) -> bool:
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"""
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Verify stop_loss against stoploss-order value (limit or price)
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Returns True if adjustment is necessary.
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:param side: "buy" or "sell"
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"""
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return order['type'] == 'stop_loss_limit' and (
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side == "sell" and stop_loss > float(order['info']['stopPrice']) or
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side == "buy" and stop_loss < float(order['info']['stopPrice'])
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)
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@retrier(retries=0)
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def stoploss(self, pair: str, amount: float,
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stop_price: float, order_types: Dict, side: str) -> Dict:
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"""
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creates a stoploss limit order.
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this stoploss-limit is binance-specific.
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It may work with a limited number of other exchanges, but this has not been tested yet.
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:param side: "buy" or "sell"
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"""
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# Limit price threshold: As limit price should always be below stop-price
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limit_price_pct = order_types.get('stoploss_on_exchange_limit_ratio', 0.99)
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rate = stop_price * limit_price_pct
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ordertype = "stop_loss_limit"
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stop_price = self.price_to_precision(pair, stop_price)
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bad_stop_price = (stop_price <= rate) if side == "sell" else (stop_price >= rate)
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# Ensure rate is less than stop price
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if bad_stop_price:
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raise OperationalException(
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'In stoploss limit order, stop price should be better than limit price')
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if self._config['dry_run']:
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dry_order = self.create_dry_run_order(
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pair, ordertype, side, amount, stop_price)
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return dry_order
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try:
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params = self._params.copy()
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params.update({'stopPrice': stop_price})
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amount = self.amount_to_precision(pair, amount)
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rate = self.price_to_precision(pair, rate)
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order = self._api.create_order(symbol=pair, type=ordertype, side=side,
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amount=amount, price=rate, params=params)
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logger.info('stoploss limit order added for %s. '
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'stop price: %s. limit: %s', pair, stop_price, rate)
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self._log_exchange_response('create_stoploss_order', order)
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return order
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except ccxt.InsufficientFunds as e:
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raise InsufficientFundsError(
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f'Insufficient funds to create {ordertype} {side} order on market {pair}. '
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f'Tried to {side} amount {amount} at rate {rate}. '
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f'Message: {e}') from e
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except ccxt.InvalidOrder as e:
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# Errors:
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# `binance Order would trigger immediately.`
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raise InvalidOrderException(
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f'Could not create {ordertype} {side} order on market {pair}. '
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f'Tried to {side} amount {amount} at rate {rate}. '
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f'Message: {e}') from e
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except ccxt.DDoSProtection as e:
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raise DDosProtection(e) from e
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(
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f'Could not place {side} order due to {e.__class__.__name__}. Message: {e}') from e
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except ccxt.BaseError as e:
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raise OperationalException(e) from e
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def _apply_leverage_to_stake_amount(self, stake_amount: float, leverage: float):
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return stake_amount / leverage
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def fill_leverage_brackets(self):
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"""
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Assigns property _leverage_brackets to a dictionary of information about the leverage
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allowed on each pair
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"""
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try:
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leverage_brackets = self._api.load_leverage_brackets()
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for pair, brackets in leverage_brackets.items:
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self.leverage_brackets[pair] = [
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[
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min_amount,
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float(margin_req)
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] for [
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min_amount,
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margin_req
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] in brackets
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]
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except ccxt.DDoSProtection as e:
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raise DDosProtection(e) from e
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(f'Could not fetch leverage amounts due to'
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f'{e.__class__.__name__}. Message: {e}') from e
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except ccxt.BaseError as e:
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raise OperationalException(e) from e
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def get_max_leverage(self, pair: Optional[str], nominal_value: Optional[float]) -> float:
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"""
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Returns the maximum leverage that a pair can be traded at
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:param pair: The base/quote currency pair being traded
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:nominal_value: The total value of the trade in quote currency (collateral + debt)
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"""
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pair_brackets = self._leverage_brackets[pair]
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max_lev = 1.0
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for [min_amount, margin_req] in pair_brackets:
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if nominal_value >= min_amount:
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max_lev = 1/margin_req
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return max_lev
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