forked from goodboy/tractor
81 lines
2.7 KiB
Python
81 lines
2.7 KiB
Python
# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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Built-in messaging patterns, types, APIs and helpers.
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'''
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# TODO: integration with our ``enable_modules: list[str]`` caps sys.
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# ``pkgutil.resolve_name()`` internally uses
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# ``importlib.import_module()`` which can be filtered by inserting
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# a ``MetaPathFinder`` into ``sys.meta_path`` (which we could do before
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# entering the ``_runtime.process_messages()`` loop).
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# - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
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# - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
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# - https://stackoverflow.com/a/63320902
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# - https://docs.python.org/3/library/sys.html#sys.meta_path
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# the new "Implicit Namespace Packages" might be relevant?
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# - https://www.python.org/dev/peps/pep-0420/
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# add implicit serialized message type support so that paths can be
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# handed directly to IPC primitives such as streams and `Portal.run()`
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# calls:
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# - via ``msgspec``:
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# - https://jcristharif.com/msgspec/api.html#struct
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# - https://jcristharif.com/msgspec/extending.html
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# via ``msgpack-python``:
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# - https://github.com/msgpack/msgpack-python#packingunpacking-of-custom-data-type
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from __future__ import annotations
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from pkgutil import resolve_name
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class NamespacePath(str):
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'''
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A serializeable description of a (function) Python object location
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described by the target's module path and namespace key meant as
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a message-native "packet" to allows actors to point-and-load objects
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by absolute reference.
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'''
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_ref: object = None
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def load_ref(self) -> object:
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if self._ref is None:
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self._ref = resolve_name(self)
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return self._ref
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def to_tuple(
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self,
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) -> tuple[str, str]:
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ref = self.load_ref()
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return ref.__module__, getattr(ref, '__name__', '')
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@classmethod
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def from_ref(
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cls,
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ref,
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) -> NamespacePath:
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return cls(':'.join(
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(ref.__module__,
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getattr(ref, '__name__', ''))
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))
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