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Add 'exchange_has' function to check if exchange supports specific API call

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Catch ccxt.NotSupported exception instead of checking beforehand
This commit is contained in:
enenn 2018-04-07 21:13:47 +02:00
parent e42403fecc
commit 5fc8250ee4
1 changed files with 15 additions and 5 deletions
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20
freqtrade/exchange/__init__.py
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@ -110,6 +110,16 @@ def validate_pairs(pairs: List[str]) -> None:
'Pair {} is not available at {}'.format(pair, _API.id.lower())) 'Pair {} is not available at {}'.format(pair, _API.id.lower()))
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: def buy(pair: str, rate: float, amount: float) -> Dict:
if _CONF['dry_run']: if _CONF['dry_run']:
global _DRY_RUN_OPEN_ORDERS global _DRY_RUN_OPEN_ORDERS
@ -231,11 +241,6 @@ def get_ticker(pair: str, refresh: Optional[bool] = True) -> dict:
@retrier @retrier
def get_ticker_history(pair: str, tick_interval: str) -> List[Dict]: 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: try:
return _API.fetch_ohlcv(pair, timeframe=tick_interval) return _API.fetch_ohlcv(pair, timeframe=tick_interval)
except ccxt.NetworkError as e: except ccxt.NetworkError as e:
@ -244,6 +249,11 @@ def get_ticker_history(pair: str, tick_interval: str) -> List[Dict]:
) )
except ccxt.BaseError as e: except ccxt.BaseError as e:
raise OperationalException('Could not fetch ticker data. Msg: {}'.format(e)) raise OperationalException('Could not fetch ticker data. Msg: {}'.format(e))
except ccxt.NotSupported as e:
raise OperationalException(
'Exchange {} does not support fetching historical candlestick data.'
'Message: {}'.format(_API.name, e)
)
def cancel_order(order_id: str, pair: str) -> None: def cancel_order(order_id: str, pair: str) -> None: