stable/freqtrade/exchange/__init__.py

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# pragma pylint: disable=W0603
""" Cryptocurrency Exchanges support """
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import enum
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import logging
import ccxt
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from random import randint
from typing import List, Dict, Any, Optional
from cachetools import cached, TTLCache
from datetime import datetime
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import arrow
import requests
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from freqtrade import OperationalException, NetworkException
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logger = logging.getLogger(__name__)
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# Current selected exchange
_API = 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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def retrier(f):
def wrapper(*args, **kwargs):
count = kwargs.pop('count', API_RETRY_COUNT)
try:
return f(*args, **kwargs)
# TODO dont be a gotta-catch-them-all pokemon collector
except Exception as ex:
logger.warn('%s returned exception: "%s"', f, ex)
if count > 0:
count -= 1
kwargs.update({'count': count})
logger.warn('retrying %s still for %s times', f, count)
return wrapper(*args, **kwargs)
else:
raise OperationalException('Giving up retrying: %s', f)
return wrapper
def _get_market_url(exchange):
"get market url for exchange"
# TODO: PR to ccxt
base = exchange.urls.get('www')
market = ""
if 'bittrex' in get_name():
market = base + '/Market/Index?MarketName={}'
if 'binance' in get_name():
market = base + '/trade.html?symbol={}'
return market
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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
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_CONF.update(config)
if config['dry_run']:
logger.info('Instance is running with dry_run enabled')
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exchange_config = config['exchange']
# Find matching class for the given exchange name
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name = exchange_config['name']
# TODO add check for a list of supported exchanges
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try:
# exchange_class = Exchanges[name.upper()].value
_API = getattr(ccxt, name.lower())({
'apiKey': exchange_config.get('key'),
'secret': exchange_config.get('secret'),
})
logger.info('Using Exchange %s', name.capitalize())
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except KeyError:
raise OperationalException('Exchange {} is not supported'.format(name))
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# we need load api markets
_API.load_markets()
# 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
"""
if not _API.markets:
_API.load_markets()
try:
markets = _API.markets
except requests.exceptions.RequestException 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
pair = pair.replace('_', '/')
# 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, _API.name.lower()))
def buy(pair: str, rate: float, amount: float) -> str:
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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,
'rate': rate,
'amount': amount,
'type': 'LIMIT_BUY',
'remaining': 0.0,
'opened': arrow.utcnow().datetime,
'closed': arrow.utcnow().datetime,
}
return order_id
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return _API.buy(pair, rate, amount)
def sell(pair: str, rate: float, amount: float) -> str:
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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,
'rate': rate,
'amount': amount,
'type': 'LIMIT_SELL',
'remaining': 0.0,
'opened': arrow.utcnow().datetime,
'closed': arrow.utcnow().datetime,
}
return order_id
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return _API.sell(pair, rate, amount)
def get_balance(currency: str) -> float:
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if _CONF['dry_run']:
return 999.9
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return _API.fetch_balance()[currency]
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def get_balances():
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if _CONF['dry_run']:
return []
return _API.fetch_balance()
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# @cached(TTLCache(maxsize=100, ttl=30))
@retrier
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def get_ticker(pair: str, refresh: Optional[bool] = True) -> dict:
return _API.fetch_ticker(pair)
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# @cached(TTLCache(maxsize=100, ttl=30))
@retrier
def get_ticker_history(pair: str, tick_interval) -> List[List]:
# TODO: tickers need to be in format 1m,5m
# fetch_ohlcv returns an [[datetime,o,h,l,c,v]]
if 'fetchOHLCV' not in _API.has or not _API.has['fetchOHLCV']:
logger.warning('Exhange %s does not support fetching historical candlestick data.',
_API.name)
return []
try:
ohlcv = _API.fetch_ohlcv(pair, timeframe=str(tick_interval)+"m")
return ohlcv
except IndexError as e:
logger.warning('Empty ticker history. Msg %s', str(e))
except ccxt.NetworkError as e:
logger.warning('Could not load ticker history due to networking error. Message: %s', str(e))
except ccxt.BaseError as e:
logger.warning('Could not fetch ticker data. Msg: %s', str(e))
return []
def cancel_order(order_id: str) -> None:
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if _CONF['dry_run']:
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return
return _API.cancel_order(order_id)
def get_order(order_id: 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
return _API.get_order(order_id)
def get_pair_detail_url(pair: str) -> str:
return _get_market_url(_API).format(
_API.markets[pair]['id']
)
def get_markets() -> List[str]:
return _API.get_markets()
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def get_market_summaries() -> List[Dict]:
return _API.fetch_tickers()
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def get_name() -> str:
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return _API.__class__.__name__.capitalize()
def get_fee_maker() -> float:
return _API.fees['trading']['maker']
def get_fee_taker() -> float:
return _API.fees['trading']['taker']
def get_fee() -> float:
return get_fee_taker()
def get_wallet_health() -> List[Dict]:
if not _API.markets:
_API.load_markets()
return _API.markets