stable/freqtrade/optimize/resolver.py

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# pragma pylint: disable=attribute-defined-outside-init
"""
This module load custom hyperopts
"""
import importlib.util
import inspect
import logging
import os
from typing import Optional, Dict, Type
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from freqtrade.constants import DEFAULT_HYPEROPT
from freqtrade.optimize.interface import IHyperOpt
logger = logging.getLogger(__name__)
class HyperOptResolver(object):
"""
This class contains all the logic to load custom hyperopt class
"""
__slots__ = ['hyperopt']
def __init__(self, config: Optional[Dict] = None) -> None:
"""
Load the custom class from config parameter
:param config: configuration dictionary or None
"""
config = config or {}
# Verify the hyperopt is in the configuration, otherwise fallback to the default hyperopt
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hyperopt_name = config.get('hyperopt') or DEFAULT_HYPEROPT
self.hyperopt = self._load_hyperopt(hyperopt_name, extra_dir=config.get('hyperopt_path'))
def _load_hyperopt(
self, hyperopt_name: str, extra_dir: Optional[str] = None) -> Optional[IHyperOpt]:
"""
Search and loads the specified hyperopt.
:param hyperopt_name: name of the module to import
:param extra_dir: additional directory to search for the given hyperopt
:return: HyperOpt instance or None
"""
current_path = os.path.dirname(os.path.realpath(__file__))
abs_paths = [
os.path.join(current_path, '..', '..', 'user_data', 'hyperopts'),
current_path,
]
if extra_dir:
# Add extra hyperopt directory on top of search paths
abs_paths.insert(0, extra_dir)
for path in abs_paths:
hyperopt = self._search_hyperopt(path, hyperopt_name)
if hyperopt:
logger.info('Using resolved hyperopt %s from \'%s\'', hyperopt_name, path)
return hyperopt
raise ImportError(
"Impossible to load Hyperopt '{}'. This class does not exist"
" or contains Python code errors".format(hyperopt_name)
)
@staticmethod
def _get_valid_hyperopts(module_path: str, hyperopt_name: str) -> Optional[Type[IHyperOpt]]:
"""
Returns a list of all possible hyperopts for the given module_path
:param module_path: absolute path to the module
:param hyperopt_name: Class name of the hyperopt
:return: Tuple with (name, class) or None
"""
# Generate spec based on absolute path
spec = importlib.util.spec_from_file_location('user_data.hyperopts', module_path)
module = importlib.util.module_from_spec(spec)
spec.loader.exec_module(module)
valid_hyperopts_gen = (
obj for name, obj in inspect.getmembers(module, inspect.isclass)
if hyperopt_name == name and IHyperOpt in obj.__bases__
)
return next(valid_hyperopts_gen, None)
@staticmethod
def _search_hyperopt(directory: str, hyperopt_name: str) -> Optional[IHyperOpt]:
"""
Search for the hyperopt_name in the given directory
:param directory: relative or absolute directory path
:return: name of the hyperopt class
"""
logger.debug('Searching for hyperopt %s in \'%s\'', hyperopt_name, directory)
for entry in os.listdir(directory):
# Only consider python files
if not entry.endswith('.py'):
logger.debug('Ignoring %s', entry)
continue
hyperopt = HyperOptResolver._get_valid_hyperopts(
os.path.abspath(os.path.join(directory, entry)), hyperopt_name
)
if hyperopt:
return hyperopt()
return None