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from typing import Any
from lagom.exceptions import InjectableNotResolved
class Injectable:
"""
This class is looked for when analysing function signatures for arguments to
injected
def __bool__(self):
If this is used in an if statement it should be falsy as it indicates the dependency
has not been injected.
:return:
return False
def __copy__(self):
Much like highlander there can be only one. Injectable
is a singleton.
return self
def __deepcopy__(self, memodict=None):
def __getattr__(self, item: str):
injectable should never have it's attributes referenced or a method call.
This normally indicates that the default injectable value hasn't been
handled by lagom - which is likely a function missing a bind decorator.
# Ignore dunder methods as it's likely some decorator magic and
# it doesn't really help to raise an exception then.
if item.startswith("__") and item.endswith("__"):
return None
raise InjectableNotResolved(
f"Cannot get {item} on injectable. Make sure the function was bound to a container instance"
)
# singleton object used to indicate that an argument should be injected
injectable: Any = Injectable()
meadsteve /
lagom
