stable/freqtrade/exchange/kraken.py

""" Kraken exchange subclass """
import logging
from typing import Any, Dict, List

import ccxt
from datetime import time
from freqtrade.exceptions import (DDosProtection, InsufficientFundsError, InvalidOrderException,
                                  OperationalException, TemporaryError)
from freqtrade.exchange import Exchange, hours_to_time
from freqtrade.exchange.common import retrier


logger = logging.getLogger(__name__)


class Kraken(Exchange):

    _params: Dict = {"trading_agreement": "agree"}
    _ft_has: Dict = {
        "stoploss_on_exchange": True,
        "ohlcv_candle_limit": 720,
        "trades_pagination": "id",
        "trades_pagination_arg": "since",
    }
    funding_fee_times: List[time] = hours_to_time([0, 4, 8, 12, 16, 20])

    def market_is_tradable(self, market: Dict[str, Any]) -> bool:
        """
        Check if the market symbol is tradable by Freqtrade.
        Default checks + check if pair is darkpool pair.
        """
        parent_check = super().market_is_tradable(market)

        return (parent_check and
                market.get('darkpool', False) is False)

    @retrier
    def get_balances(self) -> dict:
        if self._config['dry_run']:
            return {}

        try:
            balances = self._api.fetch_balance()
            # Remove additional info from ccxt results
            balances.pop("info", None)
            balances.pop("free", None)
            balances.pop("total", None)
            balances.pop("used", None)

            orders = self._api.fetch_open_orders()
            order_list = [(x["symbol"].split("/")[0 if x["side"] == "sell" else 1],
                           x["remaining"] if x["side"] == "sell" else x["remaining"] * x["price"],
                           # Don't remove the below comment, this can be important for debugging
                           # x["side"], x["amount"],
                           ) for x in orders]
            for bal in balances:
                if not isinstance(balances[bal], dict):
                    continue
                balances[bal]['used'] = sum(order[1] for order in order_list if order[0] == bal)
                balances[bal]['free'] = balances[bal]['total'] - balances[bal]['used']

            return balances
        except ccxt.DDoSProtection as e:
            raise DDosProtection(e) from e
        except (ccxt.NetworkError, ccxt.ExchangeError) as e:
            raise TemporaryError(
                f'Could not get balance due to {e.__class__.__name__}. Message: {e}') from e
        except ccxt.BaseError as e:
            raise OperationalException(e) from e

    def stoploss_adjust(self, stop_loss: float, order: Dict) -> bool:
        """
        Verify stop_loss against stoploss-order value (limit or price)
        Returns True if adjustment is necessary.
        """
        return (order['type'] in ('stop-loss', 'stop-loss-limit')
                and stop_loss > float(order['price']))

    @retrier(retries=0)
    def stoploss(self, pair: str, amount: float, stop_price: float, order_types: Dict) -> Dict:
        """
        Creates a stoploss market order.
        Stoploss market orders is the only stoploss type supported by kraken.
        """
        params = self._params.copy()

        if order_types.get('stoploss', 'market') == 'limit':
            ordertype = "stop-loss-limit"
            limit_price_pct = order_types.get('stoploss_on_exchange_limit_ratio', 0.99)
            limit_rate = stop_price * limit_price_pct
            params['price2'] = self.price_to_precision(pair, limit_rate)
        else:
            ordertype = "stop-loss"

        stop_price = self.price_to_precision(pair, stop_price)

        if self._config['dry_run']:
            dry_order = self.create_dry_run_order(
                pair, ordertype, "sell", amount, stop_price)
            return dry_order

        try:
            amount = self.amount_to_precision(pair, amount)

            order = self._api.create_order(symbol=pair, type=ordertype, side='sell',
                                           amount=amount, price=stop_price, params=params)
            self._log_exchange_response('create_stoploss_order', order)
            logger.info('stoploss order added for %s. '
                        'stop price: %s.', pair, stop_price)
            return order
        except ccxt.InsufficientFunds as e:
            raise InsufficientFundsError(
                f'Insufficient funds to create {ordertype} sell order on market {pair}. '
                f'Tried to create stoploss with amount {amount} at stoploss {stop_price}. '
                f'Message: {e}') from e
        except ccxt.InvalidOrder as e:
            raise InvalidOrderException(
                f'Could not create {ordertype} sell order on market {pair}. '
                f'Tried to create stoploss with amount {amount} at stoploss {stop_price}. '
                f'Message: {e}') from e
        except ccxt.DDoSProtection as e:
            raise DDosProtection(e) from e
        except (ccxt.NetworkError, ccxt.ExchangeError) as e:
            raise TemporaryError(
                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