56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
"""
|
|
This module loads custom exchanges
|
|
"""
|
|
import logging
|
|
from pathlib import Path
|
|
|
|
from freqtrade.exchange import Exchange
|
|
from freqtrade.resolvers import IResolver
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ExchangeResolver(IResolver):
|
|
"""
|
|
This class contains all the logic to load a custom exchange class
|
|
"""
|
|
|
|
__slots__ = ['exchange']
|
|
|
|
def __init__(self, exchange_name: str, config: dict) -> None:
|
|
"""
|
|
Load the custom class from config parameter
|
|
:param config: configuration dictionary or None
|
|
"""
|
|
try:
|
|
self.exchange = self._load_exchange(exchange_name, kwargs={'config': config})
|
|
except ImportError:
|
|
logger.info(
|
|
f"No {exchange_name} specific subclass found. Using the generic class instead.")
|
|
self.exchange = Exchange(config)
|
|
|
|
def _load_exchange(
|
|
self, exchange_name: str, kwargs: dict) -> Exchange:
|
|
"""
|
|
Search and loads the specified exchange.
|
|
:param exchange_name: name of the module to import
|
|
:param extra_dir: additional directory to search for the given exchange
|
|
:return: Exchange instance or None
|
|
"""
|
|
abs_path = Path(__file__).parent.parent.joinpath('exchange').resolve()
|
|
|
|
try:
|
|
exchange = self._search_object(directory=abs_path, object_type=Exchange,
|
|
object_name=exchange_name,
|
|
kwargs=kwargs)
|
|
if exchange:
|
|
logger.info("Using resolved exchange %s from '%s'", exchange_name, abs_path)
|
|
return exchange
|
|
except FileNotFoundError:
|
|
logger.warning('Path "%s" does not exist', abs_path.relative_to(Path.cwd()))
|
|
|
|
raise ImportError(
|
|
"Impossible to load Exchange '{}'. This class does not exist"
|
|
" or contains Python code errors".format(exchange_name)
|
|
)
|