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import pkgutil
class LeappLibrariesFinder(object):
"""
Implements functionality to dynamically load libraries for actors.
"""
def __init__(self, module_prefix, paths):
"""
:param module_prefix: Prefix string such as 'leapp.libraries.common' or 'leapp.libraries.actor' which is used
to filter the modules to handle with this finder.
:type module_prefix: str
:param paths: List of paths to search for the matching libraries
:type paths: List or Tuple
"""
self._paths = paths
self._prefix = module_prefix
def _implementation(self, method, fullname, path): # noqa; pylint: disable=unused-argument
if not fullname.startswith(self._prefix + '.'):
return None
module = fullname.split('.')[-1]
for loader, name, ispkg in pkgutil.iter_modules(self._paths):
if name == module:
return getattr(loader, method)(fullname)
def find_spec(self, fullname, path, target=None): # noqa; pylint: disable=unused-argument
""" Implementation for python >=3.4 """
return self._implementation(method='find_spec', fullname=fullname, path=path)
def find_module(self, fullname, path=None):
""" Implementation for python <3.4 """
return self._implementation(method='find_module', fullname=fullname, path=path)