stable/freqtrade/exchange/__init__.py
enenn 1f75636e56 [1/3] Add support for multiple exchanges with ccxt (objectified version) (#585)
* remove obsolete helper functions and make _state a public member.

* remove function assertions

* revert worker() changes

* Update pytest from 3.4.2 to 3.5.0

* Adapt exchange functions to ccxt API
Remove get_market_summaries and get_wallet_health, add exception handling

* Add NetworkException

* Change pair format in constants.py

* Add tests for exchange functions that comply with ccxt

* Remove bittrex tests

* Remove Bittrex and Interface classes

* Add retrier decorator

* Remove cache from get_ticker

* Remove unused and duplicate imports

* Add keyword arguments for get_fee

* Implement 'get_pair_detail_url'

* Change get_ticker_history format to ccxt format

* Fix exchange urls dict, don't need to initialize exchanges

* Add "Using Exchange ..." logging line
2018-04-06 10:57:08 +03:00

333 lines
10 KiB
Python

# pragma pylint: disable=W0603
""" Cryptocurrency Exchanges support """
import logging
from random import randint
from typing import List, Dict, Any, Optional
import ccxt
import arrow
from freqtrade import OperationalException, DependencyException, NetworkException
logger = logging.getLogger(__name__)
# Current selected exchange
_API: ccxt.Exchange = None
_CONF: dict = {}
API_RETRY_COUNT = 4
# Holds all open sell orders for dry_run
_DRY_RUN_OPEN_ORDERS: Dict[str, Any] = {}
# 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)
except (NetworkException, DependencyException) as ex:
logger.warning('%s returned exception: "%s"', f, ex)
if count > 0:
count -= 1
kwargs.update({'count': count})
logger.warning('retrying %s still for %s times', f, count)
return wrapper(*args, **kwargs)
else:
raise OperationalException('Giving up retrying: %s', f)
return wrapper
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']
# Find matching class for the given exchange name
name = exchange_config['name']
if name not in ccxt.exchanges:
raise OperationalException('Exchange {} is not supported'.format(name))
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'),
})
except (KeyError, AttributeError):
raise OperationalException('Exchange {} is not supported'.format(name))
logger.info('Using Exchange "%s"', get_name())
# Check if all pairs are available
validate_pairs(config['exchange']['pair_whitelist'])
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.
: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
stake_cur = _CONF['stake_currency']
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(
'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.id.lower()))
def buy(pair: str, rate: float, amount: float) -> Dict:
if _CONF['dry_run']:
global _DRY_RUN_OPEN_ORDERS
order_id = 'dry_run_buy_{}'.format(randint(0, 10**6))
_DRY_RUN_OPEN_ORDERS[order_id] = {
'pair': pair,
'price': rate,
'amount': amount,
'type': 'limit',
'side': 'buy',
'remaining': 0.0,
'datetime': arrow.utcnow().isoformat(),
'status': 'closed'
}
return {'id': order_id}
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)
)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not place buy order due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
def sell(pair: str, rate: float, amount: float) -> Dict:
if _CONF['dry_run']:
global _DRY_RUN_OPEN_ORDERS
order_id = 'dry_run_sell_{}'.format(randint(0, 10**6))
_DRY_RUN_OPEN_ORDERS[order_id] = {
'pair': pair,
'price': rate,
'amount': amount,
'type': 'limit',
'side': 'sell',
'remaining': 0.0,
'datetime': arrow.utcnow().isoformat(),
'status': 'closed'
}
return {'id': order_id}
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)
)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not place sell order due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
def get_balance(currency: str) -> float:
if _CONF['dry_run']:
return 999.9
# ccxt exception is already handled by get_balances
balances = get_balances()
return balances[currency]['free']
def get_balances() -> dict:
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
except ccxt.NetworkError as e:
raise NetworkException(
'Could not get balance due to networking error. Message: {}'.format(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
def get_ticker(pair: str, refresh: Optional[bool] = True) -> dict:
try:
return _API.fetch_ticker(pair)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not load tickers due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
@retrier
def get_ticker_history(pair: str, tick_interval: str) -> List[Dict]:
if 'fetchOHLCV' not in _API.has or not _API.has['fetchOHLCV']:
raise OperationalException(
'Exchange {} does not support fetching historical candlestick data.'.format(_API.name)
)
try:
return _API.fetch_ohlcv(pair, timeframe=tick_interval)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not load ticker history due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException('Could not fetch ticker data. Msg: {}'.format(e))
def cancel_order(order_id: str, pair: str) -> None:
if _CONF['dry_run']:
return
try:
return _API.cancel_order(order_id, pair)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not get order due to networking error. Message: {}'.format(e)
)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not cancel order. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
def get_order(order_id: str, pair: str) -> Dict:
if _CONF['dry_run']:
order = _DRY_RUN_OPEN_ORDERS[order_id]
order.update({
'id': order_id
})
return order
try:
return _API.fetch_order(order_id, pair)
except ccxt.NetworkError as e:
raise NetworkException(
'Could not get order due to networking error. Message: {}'.format(e)
)
except ccxt.InvalidOrder as e:
raise DependencyException(
'Could not get order. 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 ""
def get_markets() -> List[dict]:
try:
return _API.fetch_markets()
except ccxt.NetworkError as e:
raise NetworkException(
'Could not load markets due to networking error. Message: {}'.format(e)
)
except ccxt.BaseError as e:
raise OperationalException(e)
def get_name() -> str:
return _API.name
def get_id() -> str:
return _API.id
def get_fee_maker() -> float:
return _API.fees['trading']['maker']
def get_fee_taker() -> float:
return _API.fees['trading']['taker']
def get_fee() -> float:
# 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='ETH/BTC', type='', side='', amount=1, price=1)['rate']