208 lines
7.4 KiB
Python
208 lines
7.4 KiB
Python
# pragma pylint: disable=W0603
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""" Wallet """
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import logging
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from copy import deepcopy
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from typing import Any, Dict, NamedTuple
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import arrow
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from freqtrade.constants import UNLIMITED_STAKE_AMOUNT
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from freqtrade.exceptions import DependencyException
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from freqtrade.exchange import Exchange
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from freqtrade.persistence import LocalTrade, Trade
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from freqtrade.state import RunMode
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logger = logging.getLogger(__name__)
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# wallet data structure
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class Wallet(NamedTuple):
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currency: str
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free: float = 0
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used: float = 0
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total: float = 0
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class Wallets:
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def __init__(self, config: dict, exchange: Exchange, log: bool = True) -> None:
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self._config = config
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self._log = log
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self._exchange = exchange
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self._wallets: Dict[str, Wallet] = {}
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self.start_cap = config['dry_run_wallet']
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self._last_wallet_refresh = 0
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self.update()
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def get_free(self, currency: str) -> float:
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balance = self._wallets.get(currency)
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if balance and balance.free:
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return balance.free
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else:
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return 0
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def get_used(self, currency: str) -> float:
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balance = self._wallets.get(currency)
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if balance and balance.used:
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return balance.used
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else:
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return 0
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def get_total(self, currency: str) -> float:
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balance = self._wallets.get(currency)
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if balance and balance.total:
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return balance.total
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else:
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return 0
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def _update_dry(self) -> None:
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"""
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Update from database in dry-run mode
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- Apply apply profits of closed trades on top of stake amount
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- Subtract currently tied up stake_amount in open trades
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- update balances for currencies currently in trades
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"""
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# Recreate _wallets to reset closed trade balances
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_wallets = {}
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open_trades = Trade.get_trades_proxy(is_open=True)
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# If not backtesting...
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# TODO: potentially remove the ._log workaround to determine backtest mode.
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if self._log:
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closed_trades = Trade.get_trades_proxy(is_open=False)
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tot_profit = sum([trade.close_profit_abs for trade in closed_trades])
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else:
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tot_profit = LocalTrade.total_profit
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tot_in_trades = sum([trade.stake_amount for trade in open_trades])
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current_stake = self.start_cap + tot_profit - tot_in_trades
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_wallets[self._config['stake_currency']] = Wallet(
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self._config['stake_currency'],
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current_stake,
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0,
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current_stake
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)
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for trade in open_trades:
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curr = self._exchange.get_pair_base_currency(trade.pair)
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_wallets[curr] = Wallet(
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curr,
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trade.amount,
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0,
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trade.amount
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)
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self._wallets = _wallets
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def _update_live(self) -> None:
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balances = self._exchange.get_balances()
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for currency in balances:
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self._wallets[currency] = Wallet(
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currency,
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balances[currency].get('free', None),
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balances[currency].get('used', None),
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balances[currency].get('total', None)
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)
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# Remove currencies no longer in get_balances output
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for currency in deepcopy(self._wallets):
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if currency not in balances:
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del self._wallets[currency]
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def update(self, require_update: bool = True) -> None:
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"""
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Updates wallets from the configured version.
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By default, updates from the exchange.
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Update-skipping should only be used for user-invoked /balance calls, since
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for trading operations, the latest balance is needed.
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:param require_update: Allow skipping an update if balances were recently refreshed
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"""
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if (require_update or (self._last_wallet_refresh + 3600 < arrow.utcnow().int_timestamp)):
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if (not self._config['dry_run'] or self._config.get('runmode') == RunMode.LIVE):
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self._update_live()
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else:
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self._update_dry()
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if self._log:
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logger.info('Wallets synced.')
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self._last_wallet_refresh = arrow.utcnow().int_timestamp
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def get_all_balances(self) -> Dict[str, Any]:
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return self._wallets
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def _get_available_stake_amount(self) -> float:
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"""
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Return the total currently available balance in stake currency,
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respecting tradable_balance_ratio.
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Calculated as
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(<open_trade stakes> + free amount ) * tradable_balance_ratio - <open_trade stakes>
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"""
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val_tied_up = Trade.total_open_trades_stakes()
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# Ensure <tradable_balance_ratio>% is used from the overall balance
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# Otherwise we'd risk lowering stakes with each open trade.
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# (tied up + current free) * ratio) - tied up
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available_amount = ((val_tied_up + self.get_free(self._config['stake_currency'])) *
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self._config['tradable_balance_ratio']) - val_tied_up
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return available_amount
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def _calculate_unlimited_stake_amount(self, free_open_trades: int) -> float:
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"""
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Calculate stake amount for "unlimited" stake amount
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:return: 0 if max number of trades reached, else stake_amount to use.
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"""
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if not free_open_trades:
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return 0
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available_amount = self._get_available_stake_amount()
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return available_amount / free_open_trades
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def _check_available_stake_amount(self, stake_amount: float) -> float:
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"""
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Check if stake amount can be fulfilled with the available balance
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for the stake currency
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:return: float: Stake amount
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:raise: DependencyException if balance is lower than stake-amount
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"""
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available_amount = self._get_available_stake_amount()
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if self._config['amend_last_stake_amount']:
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# Remaining amount needs to be at least stake_amount * last_stake_amount_min_ratio
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# Otherwise the remaining amount is too low to trade.
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if available_amount > (stake_amount * self._config['last_stake_amount_min_ratio']):
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stake_amount = min(stake_amount, available_amount)
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else:
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stake_amount = 0
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if available_amount < stake_amount:
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raise DependencyException(
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f"Available balance ({available_amount} {self._config['stake_currency']}) is "
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f"lower than stake amount ({stake_amount} {self._config['stake_currency']})"
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)
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return stake_amount
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def get_trade_stake_amount(self, pair: str, free_open_trades: int, edge=None) -> float:
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"""
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Calculate stake amount for the trade
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:return: float: Stake amount
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:raise: DependencyException if the available stake amount is too low
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"""
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stake_amount: float
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# Ensure wallets are uptodate.
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self.update()
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if edge:
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stake_amount = edge.stake_amount(
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pair,
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self.get_free(self._config['stake_currency']),
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self.get_total(self._config['stake_currency']),
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Trade.total_open_trades_stakes()
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)
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else:
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stake_amount = self._config['stake_amount']
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if stake_amount == UNLIMITED_STAKE_AMOUNT:
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stake_amount = self._calculate_unlimited_stake_amount(free_open_trades)
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return self._check_available_stake_amount(stake_amount)
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