stable/freqtrade/exchange/__init__.py

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# pragma pylint: disable=W0603
""" Cryptocurrency Exchanges support """
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import logging
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from random import randint
from typing import List, Dict, Any, Optional
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from datetime import datetime
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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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# Current selected exchange
_API: ccxt.Exchange = None
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_CONF: Dict = {}
API_RETRY_COUNT = 4
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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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# Urls to exchange markets, insert quote and base with .format()
_EXCHANGE_URLS = {
ccxt.bittrex.__name__: '/Market/Index?MarketName={quote}-{base}',
ccxt.binance.__name__: '/tradeDetail.html?symbol={base}_{quote}'
}
def retrier(f):
def wrapper(*args, **kwargs):
count = kwargs.pop('count', API_RETRY_COUNT)
try:
return f(*args, **kwargs)
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except (TemporaryError, DependencyException) as ex:
logger.warning('%s() returned exception: "%s"', f.__name__, ex)
if count > 0:
count -= 1
kwargs.update({'count': count})
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logger.warning('retrying %s() still for %s times', f.__name__, count)
return wrapper(*args, **kwargs)
else:
logger.warning('Giving up retrying: %s()', f.__name__)
raise ex
return wrapper
def init_ccxt(exchange_config: dict) -> ccxt.Exchange:
"""
Initialize ccxt with given config and return valid
ccxt instance.
:param config: config to use
:return: ccxt
"""
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# Find matching class for the given exchange name
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name = exchange_config['name']
if name not in ccxt.exchanges:
raise OperationalException('Exchange {} is not supported'.format(name))
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try:
api = getattr(ccxt, name.lower())({
'apiKey': exchange_config.get('key'),
'secret': exchange_config.get('secret'),
'password': exchange_config.get('password'),
'uid': exchange_config.get('uid', ''),
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'enableRateLimit': True,
})
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except (KeyError, AttributeError):
raise OperationalException('Exchange {} is not supported'.format(name))
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return api
def init(config: dict) -> None:
"""
Initializes this module with the given config,
it does basic validation whether the specified
exchange and pairs are valid.
:param config: config to use
:return: None
"""
global _CONF, _API
_CONF.update(config)
if config['dry_run']:
logger.info('Instance is running with dry_run enabled')
exchange_config = config['exchange']
_API = init_ccxt(exchange_config)
logger.info('Using Exchange "%s"', get_name())
# Check if all pairs are available
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validate_pairs(config['exchange']['pair_whitelist'])
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def validate_pairs(pairs: List[str]) -> None:
"""
Checks if all given pairs are tradable on the current exchange.
Raises OperationalException if one pair is not available.
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:param pairs: list of pairs
:return: None
"""
try:
markets = _API.load_markets()
except ccxt.BaseError as e:
logger.warning('Unable to validate pairs (assuming they are correct). Reason: %s', e)
return
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stake_cur = _CONF['stake_currency']
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for pair in pairs:
# Note: ccxt has BaseCurrency/QuoteCurrency format for pairs
# TODO: add a support for having coins in BTC/USDT format
if not pair.endswith(stake_cur):
raise OperationalException(
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'Pair {} not compatible with stake_currency: {}'.format(pair, stake_cur)
)
if pair not in markets:
raise OperationalException(
'Pair {} is not available at {}'.format(pair, get_name()))
def exchange_has(endpoint: str) -> bool:
"""
Checks if exchange implements a specific API endpoint.
Wrapper around ccxt 'has' attribute
:param endpoint: Name of endpoint (e.g. 'fetchOHLCV', 'fetchTickers')
:return: bool
"""
return endpoint in _API.has and _API.has[endpoint]
def buy(pair: str, rate: float, amount: float) -> Dict:
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if _CONF['dry_run']:
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global _DRY_RUN_OPEN_ORDERS
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order_id = 'dry_run_buy_{}'.format(randint(0, 10**6))
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_DRY_RUN_OPEN_ORDERS[order_id] = {
'pair': pair,
'price': rate,
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'amount': amount,
'type': 'limit',
'side': 'buy',
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'remaining': 0.0,
'datetime': arrow.utcnow().isoformat(),
'status': 'closed',
'fee': None
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}
return {'id': order_id}
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try:
return _API.create_limit_buy_order(pair, amount, rate)
except ccxt.InsufficientFunds as e:
raise DependencyException(
'Insufficient funds to create limit buy order on market {}.'
'Tried to buy amount {} at rate {} (total {}).'
'Message: {}'.format(pair, amount, rate, rate*amount, e)
)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not create limit buy order on market {}.'
'Tried to buy amount {} at rate {} (total {}).'
'Message: {}'.format(pair, amount, rate, rate*amount, e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not place buy order due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
def sell(pair: str, rate: float, amount: float) -> Dict:
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if _CONF['dry_run']:
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global _DRY_RUN_OPEN_ORDERS
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order_id = 'dry_run_sell_{}'.format(randint(0, 10**6))
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_DRY_RUN_OPEN_ORDERS[order_id] = {
'pair': pair,
'price': rate,
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'amount': amount,
'type': 'limit',
'side': 'sell',
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'remaining': 0.0,
'datetime': arrow.utcnow().isoformat(),
'status': 'closed'
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}
return {'id': order_id}
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try:
return _API.create_limit_sell_order(pair, amount, rate)
except ccxt.InsufficientFunds as e:
raise DependencyException(
'Insufficient funds to create limit sell order on market {}.'
'Tried to sell amount {} at rate {} (total {}).'
'Message: {}'.format(pair, amount, rate, rate*amount, e)
)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not create limit sell order on market {}.'
'Tried to sell amount {} at rate {} (total {}).'
'Message: {}'.format(pair, amount, rate, rate*amount, e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not place sell order due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
@retrier
def get_balance(currency: str) -> float:
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if _CONF['dry_run']:
return 999.9
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# ccxt exception is already handled by get_balances
balances = get_balances()
balance = balances.get(currency)
if balance is None:
raise TemporaryError(
'Could not get {} balance due to malformed exchange response: {}'.format(
currency, balances))
return balance['free']
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@retrier
def get_balances() -> dict:
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if _CONF['dry_run']:
return {}
try:
balances = _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)
return balances
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not get balance due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
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@retrier
def get_tickers() -> Dict:
try:
return _API.fetch_tickers()
except ccxt.NotSupported as e:
raise OperationalException(
'Exchange {} does not support fetching tickers in batch.'
'Message: {}'.format(_API.name, e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not load tickers due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
# TODO: remove refresh argument, keeping it to keep track of where it was intended to be used
@retrier
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def get_ticker(pair: str, refresh: Optional[bool] = True) -> dict:
try:
return _API.fetch_ticker(pair)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not load ticker history due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
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@retrier
def get_ticker_history(pair: str, tick_interval: str, since_ms: Optional[int] = None) -> List[Dict]:
try:
# last item should be in the time interval [now - tick_interval, now]
till_time_ms = arrow.utcnow().shift(
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minutes=-constants.TICKER_INTERVAL_MINUTES[tick_interval]
).timestamp * 1000
# it looks as if some exchanges return cached data
# and they update it one in several minute, so 10 mins interval
# is necessary to skeep downloading of an empty array when all
# chached data was already downloaded
till_time_ms = min(till_time_ms, arrow.utcnow().shift(minutes=-10).timestamp * 1000)
data = []
while not since_ms or since_ms < till_time_ms:
data_part = _API.fetch_ohlcv(pair, timeframe=tick_interval, since=since_ms)
if not data_part:
break
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logger.debug('Downloaded data for %s time range [%s, %s]',
pair,
arrow.get(data_part[0][0] / 1000).format(),
arrow.get(data_part[-1][0] / 1000).format())
data.extend(data_part)
since_ms = data[-1][0] + 1
return data
except ccxt.NotSupported as e:
raise OperationalException(
'Exchange {} does not support fetching historical candlestick data.'
'Message: {}'.format(_API.name, e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not load ticker history due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException('Could not fetch ticker data. Msg: {}'.format(e))
@retrier
def cancel_order(order_id: str, pair: str) -> None:
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if _CONF['dry_run']:
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return
try:
return _API.cancel_order(order_id, pair)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not cancel order. Message: {}'.format(e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not cancel order due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
@retrier
def get_order(order_id: str, pair: str) -> Dict:
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if _CONF['dry_run']:
order = _DRY_RUN_OPEN_ORDERS[order_id]
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order.update({
'id': order_id
})
return order
try:
return _API.fetch_order(order_id, pair)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not get order. Message: {}'.format(e)
)
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not get order due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
@retrier
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def get_trades_for_order(order_id: str, pair: str, since: datetime) -> List:
if _CONF['dry_run']:
return []
if not exchange_has('fetchMyTrades'):
return []
try:
my_trades = _API.fetch_my_trades(pair, since.timestamp())
matched_trades = [trade for trade in my_trades if trade['order'] == order_id]
return matched_trades
except ccxt.NetworkError as e:
raise TemporaryError(
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'Could not get trades due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
def get_pair_detail_url(pair: str) -> str:
try:
url_base = _API.urls.get('www')
base, quote = pair.split('/')
return url_base + _EXCHANGE_URLS[_API.id].format(base=base, quote=quote)
except KeyError:
logger.warning('Could not get exchange url for %s', get_name())
return ""
@retrier
def get_markets() -> List[dict]:
try:
return _API.fetch_markets()
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except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not load markets due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
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def get_name() -> str:
return _API.name
def get_id() -> str:
return _API.id
@retrier
def get_fee(symbol='ETH/BTC', type='', side='', amount=1,
price=1, taker_or_maker='maker') -> float:
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try:
# validate that markets are loaded before trying to get fee
if _API.markets is None or len(_API.markets) == 0:
_API.load_markets()
return _API.calculate_fee(symbol=symbol, type=type, side=side, amount=amount,
price=price, takerOrMaker=taker_or_maker)['rate']
except (ccxt.NetworkError, ccxt.ExchangeError) as e:
raise TemporaryError(
'Could not get fee info due to {}. Message: {}'.format(
e.__class__.__name__, e))
except ccxt.BaseError as e:
raise OperationalException(e)
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def get_amount_lots(pair: str, amount: float) -> float:
"""
get buyable amount rounding, ..
"""
# validate that markets are loaded before trying to get fee
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if not _API.markets:
_API.load_markets()
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return _API.amount_to_lots(pair, amount)