474 lines
18 KiB
Python
474 lines
18 KiB
Python
# pragma pylint: disable=W0603
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""" Cryptocurrency Exchanges support """
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import logging
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from random import randint
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from typing import List, Dict, Any, Optional
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from datetime import datetime
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from math import floor, ceil
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import ccxt
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import arrow
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from freqtrade import constants, OperationalException, DependencyException, TemporaryError
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logger = logging.getLogger(__name__)
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API_RETRY_COUNT = 4
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# Urls to exchange markets, insert quote and base with .format()
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_EXCHANGE_URLS = {
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ccxt.bittrex.__name__: '/Market/Index?MarketName={quote}-{base}',
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ccxt.binance.__name__: '/tradeDetail.html?symbol={base}_{quote}'
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}
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def retrier(f):
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def wrapper(*args, **kwargs):
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count = kwargs.pop('count', API_RETRY_COUNT)
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try:
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return f(*args, **kwargs)
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except (TemporaryError, DependencyException) as ex:
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logger.warning('%s() returned exception: "%s"', f.__name__, ex)
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if count > 0:
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count -= 1
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kwargs.update({'count': count})
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logger.warning('retrying %s() still for %s times', f.__name__, count)
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return wrapper(*args, **kwargs)
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else:
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logger.warning('Giving up retrying: %s()', f.__name__)
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raise ex
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return wrapper
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class Exchange(object):
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# Current selected exchange
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_api: ccxt.Exchange = None
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_conf: Dict = {}
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_cached_ticker: Dict[str, Any] = {}
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# Holds all open sell orders for dry_run
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_dry_run_open_orders: Dict[str, Any] = {}
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def __init__(self, config: dict) -> None:
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"""
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Initializes this module with the given config,
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it does basic validation whether the specified
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exchange and pairs are valid.
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:return: None
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"""
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self._conf.update(config)
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if config['dry_run']:
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logger.info('Instance is running with dry_run enabled')
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exchange_config = config['exchange']
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self._api = self._init_ccxt(exchange_config)
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logger.info('Using Exchange "%s"', self.name)
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# Check if all pairs are available
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self.validate_pairs(config['exchange']['pair_whitelist'])
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if config.get('ticker_interval'):
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# Check if timeframe is available
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self.validate_timeframes(config['ticker_interval'])
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def _init_ccxt(self, exchange_config: dict) -> ccxt.Exchange:
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"""
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Initialize ccxt with given config and return valid
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ccxt instance.
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"""
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# Find matching class for the given exchange name
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name = exchange_config['name']
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if name not in ccxt.exchanges:
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raise OperationalException(f'Exchange {name} is not supported')
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try:
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api = getattr(ccxt, name.lower())({
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'apiKey': exchange_config.get('key'),
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'secret': exchange_config.get('secret'),
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'password': exchange_config.get('password'),
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'uid': exchange_config.get('uid', ''),
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'enableRateLimit': exchange_config.get('ccxt_rate_limit', True),
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})
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except (KeyError, AttributeError):
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raise OperationalException(f'Exchange {name} is not supported')
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self.set_sandbox(api, exchange_config, name)
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return api
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@property
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def name(self) -> str:
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"""exchange Name (from ccxt)"""
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return self._api.name
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@property
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def id(self) -> str:
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"""exchange ccxt id"""
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return self._api.id
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def set_sandbox(self, api, exchange_config: dict, name: str):
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if exchange_config.get('sandbox'):
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if api.urls.get('test'):
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api.urls['api'] = api.urls['test']
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logger.info("Enabled Sandbox API on %s", name)
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else:
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logger.warning(self, "No Sandbox URL in CCXT, exiting. "
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"Please check your config.json")
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raise OperationalException(f'Exchange {name} does not provide a sandbox api')
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def validate_pairs(self, pairs: List[str]) -> None:
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"""
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Checks if all given pairs are tradable on the current exchange.
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Raises OperationalException if one pair is not available.
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:param pairs: list of pairs
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:return: None
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"""
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try:
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markets = self._api.load_markets()
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except ccxt.BaseError as e:
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logger.warning('Unable to validate pairs (assuming they are correct). Reason: %s', e)
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return
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stake_cur = self._conf['stake_currency']
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for pair in pairs:
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# Note: ccxt has BaseCurrency/QuoteCurrency format for pairs
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# TODO: add a support for having coins in BTC/USDT format
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if not pair.endswith(stake_cur):
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raise OperationalException(
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f'Pair {pair} not compatible with stake_currency: {stake_cur}')
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if pair not in markets:
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raise OperationalException(
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f'Pair {pair} is not available at {self.name}')
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def validate_timeframes(self, timeframe: List[str]) -> None:
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"""
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Checks if ticker interval from config is a supported timeframe on the exchange
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"""
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timeframes = self._api.timeframes
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if timeframe not in timeframes:
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raise OperationalException(
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f'Invalid ticker {timeframe}, this Exchange supports {timeframes}')
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def exchange_has(self, endpoint: str) -> bool:
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"""
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Checks if exchange implements a specific API endpoint.
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Wrapper around ccxt 'has' attribute
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:param endpoint: Name of endpoint (e.g. 'fetchOHLCV', 'fetchTickers')
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:return: bool
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"""
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return endpoint in self._api.has and self._api.has[endpoint]
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def symbol_amount_prec(self, pair, amount: float):
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'''
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Returns the amount to buy or sell to a precision the Exchange accepts
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Rounded down
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'''
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if self._api.markets[pair]['precision']['amount']:
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symbol_prec = self._api.markets[pair]['precision']['amount']
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big_amount = amount * pow(10, symbol_prec)
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amount = floor(big_amount) / pow(10, symbol_prec)
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return amount
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def symbol_price_prec(self, pair, price: float):
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'''
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Returns the price buying or selling with to the precision the Exchange accepts
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Rounds up
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'''
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if self._api.markets[pair]['precision']['price']:
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symbol_prec = self._api.markets[pair]['precision']['price']
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big_price = price * pow(10, symbol_prec)
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price = ceil(big_price) / pow(10, symbol_prec)
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return price
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def buy(self, pair: str, rate: float, amount: float) -> Dict:
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if self._conf['dry_run']:
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order_id = f'dry_run_buy_{randint(0, 10**6)}'
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self._dry_run_open_orders[order_id] = {
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'pair': pair,
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'price': rate,
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'amount': amount,
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'type': 'limit',
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'side': 'buy',
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'remaining': 0.0,
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'datetime': arrow.utcnow().isoformat(),
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'status': 'closed',
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'fee': None
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}
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return {'id': order_id}
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try:
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# Set the precision for amount and price(rate) as accepted by the exchange
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amount = self.symbol_amount_prec(pair, amount)
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rate = self.symbol_price_prec(pair, rate)
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return self._api.create_limit_buy_order(pair, amount, rate)
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except ccxt.InsufficientFunds as e:
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raise DependencyException(
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f'Insufficient funds to create limit buy order on market {pair}.'
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f'Tried to buy amount {amount} at rate {rate} (total {rate*amount}).'
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f'Message: {e}')
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except ccxt.InvalidOrder as e:
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raise DependencyException(
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f'Could not create limit buy order on market {pair}.'
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f'Tried to buy amount {amount} at rate {rate} (total {rate*amount}).'
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f'Message: {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 buy order due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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def sell(self, pair: str, rate: float, amount: float) -> Dict:
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if self._conf['dry_run']:
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order_id = f'dry_run_sell_{randint(0, 10**6)}'
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self._dry_run_open_orders[order_id] = {
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'pair': pair,
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'price': rate,
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'amount': amount,
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'type': 'limit',
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'side': 'sell',
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'remaining': 0.0,
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'datetime': arrow.utcnow().isoformat(),
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'status': 'closed'
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}
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return {'id': order_id}
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try:
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# Set the precision for amount and price(rate) as accepted by the exchange
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amount = self.symbol_amount_prec(pair, amount)
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rate = self.symbol_price_prec(pair, rate)
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return self._api.create_limit_sell_order(pair, amount, rate)
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except ccxt.InsufficientFunds as e:
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raise DependencyException(
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f'Insufficient funds to create limit sell order on market {pair}.'
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f'Tried to sell amount {amount} at rate {rate} (total {rate*amount}).'
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f'Message: {e}')
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except ccxt.InvalidOrder as e:
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raise DependencyException(
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f'Could not create limit sell order on market {pair}.'
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f'Tried to sell amount {amount} at rate {rate} (total {rate*amount}).'
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f'Message: {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 sell order due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_balance(self, currency: str) -> float:
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if self._conf['dry_run']:
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return 999.9
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# ccxt exception is already handled by get_balances
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balances = self.get_balances()
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balance = balances.get(currency)
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if balance is None:
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raise TemporaryError(
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f'Could not get {currency} balance due to malformed exchange response: {balances}')
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return balance['free']
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@retrier
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def get_balances(self) -> dict:
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if self._conf['dry_run']:
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return {}
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try:
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balances = self._api.fetch_balance()
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# Remove additional info from ccxt results
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balances.pop("info", None)
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balances.pop("free", None)
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balances.pop("total", None)
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balances.pop("used", None)
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return balances
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(
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f'Could not get balance due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_tickers(self) -> Dict:
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try:
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return self._api.fetch_tickers()
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except ccxt.NotSupported as e:
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raise OperationalException(
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f'Exchange {self._api.name} does not support fetching tickers in batch.'
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f'Message: {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 load tickers due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_ticker(self, pair: str, refresh: Optional[bool] = True) -> dict:
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if refresh or pair not in self._cached_ticker.keys():
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try:
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data = self._api.fetch_ticker(pair)
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try:
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self._cached_ticker[pair] = {
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'bid': float(data['bid']),
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'ask': float(data['ask']),
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}
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except KeyError:
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logger.debug("Could not cache ticker data for %s", pair)
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return data
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(
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f'Could not load ticker history due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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else:
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logger.info("returning cached ticker-data for %s", pair)
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return self._cached_ticker[pair]
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@retrier
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def get_ticker_history(self, pair: str, tick_interval: str,
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since_ms: Optional[int] = None) -> List[Dict]:
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try:
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# last item should be in the time interval [now - tick_interval, now]
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till_time_ms = arrow.utcnow().shift(
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minutes=-constants.TICKER_INTERVAL_MINUTES[tick_interval]
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).timestamp * 1000
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# it looks as if some exchanges return cached data
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# and they update it one in several minute, so 10 mins interval
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# is necessary to skeep downloading of an empty array when all
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# chached data was already downloaded
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till_time_ms = min(till_time_ms, arrow.utcnow().shift(minutes=-10).timestamp * 1000)
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data: List[Dict[Any, Any]] = []
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while not since_ms or since_ms < till_time_ms:
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data_part = self._api.fetch_ohlcv(pair, timeframe=tick_interval, since=since_ms)
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# Because some exchange sort Tickers ASC and other DESC.
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# Ex: Bittrex returns a list of tickers ASC (oldest first, newest last)
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# when GDAX returns a list of tickers DESC (newest first, oldest last)
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data_part = sorted(data_part, key=lambda x: x[0])
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if not data_part:
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break
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logger.debug('Downloaded data for %s time range [%s, %s]',
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pair,
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arrow.get(data_part[0][0] / 1000).format(),
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arrow.get(data_part[-1][0] / 1000).format())
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data.extend(data_part)
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since_ms = data[-1][0] + 1
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return data
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except ccxt.NotSupported as e:
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raise OperationalException(
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f'Exchange {self._api.name} does not support fetching historical candlestick data.'
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f'Message: {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 load ticker history due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(f'Could not fetch ticker data. Msg: {e}')
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@retrier
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def cancel_order(self, order_id: str, pair: str) -> None:
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if self._conf['dry_run']:
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return
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try:
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return self._api.cancel_order(order_id, pair)
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except ccxt.InvalidOrder as e:
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raise DependencyException(
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f'Could not cancel order. Message: {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 cancel order due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_order(self, order_id: str, pair: str) -> Dict:
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if self._conf['dry_run']:
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order = self._dry_run_open_orders[order_id]
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order.update({
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'id': order_id
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})
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return order
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try:
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return self._api.fetch_order(order_id, pair)
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except ccxt.InvalidOrder as e:
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raise DependencyException(
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f'Could not get order. Message: {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 get order due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_trades_for_order(self, order_id: str, pair: str, since: datetime) -> List:
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if self._conf['dry_run']:
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return []
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if not self.exchange_has('fetchMyTrades'):
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return []
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try:
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my_trades = self._api.fetch_my_trades(pair, since.timestamp())
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matched_trades = [trade for trade in my_trades if trade['order'] == order_id]
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return matched_trades
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except ccxt.NetworkError as e:
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raise TemporaryError(
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f'Could not get trades due to networking error. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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def get_pair_detail_url(self, pair: str) -> str:
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try:
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url_base = self._api.urls.get('www')
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base, quote = pair.split('/')
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return url_base + _EXCHANGE_URLS[self._api.id].format(base=base, quote=quote)
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except KeyError:
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logger.warning('Could not get exchange url for %s', self.name)
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return ""
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@retrier
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def get_markets(self) -> List[dict]:
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try:
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return self._api.fetch_markets()
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(
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f'Could not load markets due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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@retrier
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def get_fee(self, symbol='ETH/BTC', type='', side='', amount=1,
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price=1, taker_or_maker='maker') -> float:
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try:
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# validate that markets are loaded before trying to get fee
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if self._api.markets is None or len(self._api.markets) == 0:
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self._api.load_markets()
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return self._api.calculate_fee(symbol=symbol, type=type, side=side, amount=amount,
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price=price, takerOrMaker=taker_or_maker)['rate']
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
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raise TemporaryError(
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f'Could not get fee info due to {e.__class__.__name__}. Message: {e}')
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except ccxt.BaseError as e:
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raise OperationalException(e)
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def get_amount_lots(self, pair: str, amount: float) -> float:
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"""
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get buyable amount rounding, ..
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"""
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# validate that markets are loaded before trying to get fee
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if not self._api.markets:
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self._api.load_markets()
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return self._api.amount_to_lots(pair, amount)
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