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Add todo resources for eventual capability-based module filtering

nspaths
Tyler Goodlet 2022-01-29 13:59:12 -05:00
parent c265f3f94e
commit 25a27e780d
1 changed files with 50 additions and 1 deletions

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@ -15,6 +15,55 @@
# along with this program. If not, see <https://www.gnu.org/licenses/>.
'''
Coming soon!
Built-in messaging patterns, types, APIs and helpers.
'''
# TODO: integration with our ``enable_modules: list[str]`` caps sys.
# ``pkgutil.resolve_name()`` internally uses
# ``importlib.import_module()`` which can be filtered by inserting
# a ``MetaPathFinder`` into ``sys.meta_path`` (which we could do before
# entering the ``Actor._process_messages()`` loop).
# - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
# - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
# - https://stackoverflow.com/a/63320902
# - https://docs.python.org/3/library/sys.html#sys.meta_path
# the new "Implicit Namespace Packages" might be relevant?
# - https://www.python.org/dev/peps/pep-0420/
from __future__ import annotations
from pkgutil import resolve_name
class NamespacePath(str):
'''
A serializeable description of a (function) Python object location
described by the target's module path and its namespace key.
'''
_ref: object = None
def load_ref(self) -> object:
if self._ref is None:
self._ref = resolve_name(self)
return self._ref
def to_tuple(
self,
) -> tuple[str, str]:
ref = self.load_ref()
return ref.__module__, getattr(ref, '__name__', '')
@classmethod
def from_ref(
cls,
ref,
) -> NamespacePath:
return cls(':'.join(
(ref.__module__,
getattr(ref, '__name__', ''))
))