109 lines
2.9 KiB
Python
109 lines
2.9 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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Type-extension-utils for codec-ing (python) objects not
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covered by the `msgspec.msgpack` protocol.
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See the various API docs from `msgspec`.
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extending from native types,
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- https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
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converters,
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- https://jcristharif.com/msgspec/converters.html
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- https://jcristharif.com/msgspec/api.html#msgspec.convert
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`Raw` fields,
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- https://jcristharif.com/msgspec/api.html#raw
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- support for `.convert()` and `Raw`,
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|_ https://jcristharif.com/msgspec/changelog.html
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'''
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import types
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import typing
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from typing import (
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Type,
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Union,
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)
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def dec_type_union(
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type_names: list[str],
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mods: list[types.ModuleType] = []
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) -> Type|Union[Type]:
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'''
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Look up types by name, compile into a list and then create and
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return a `typing.Union` from the full set.
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'''
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_types: list[Type] = []
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for type_name in type_names:
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for mod in [
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typing,
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types,
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] + mods:
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if type_ref := getattr(
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mod,
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type_name,
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False,
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):
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_types.append(type_ref)
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break
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report: str = ''
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if not _types:
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report: str = 'No type-instances could be resolved from `type_names` ??\n'
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elif len(type_names) != len(_types):
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report: str = (
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f'Some type-instances could not be resolved from `type_names` ??\n'
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f'_types: {_types!r}\n'
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)
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if report:
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raise ValueError(
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report
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+
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f'type_names: {type_names!r}\n'
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)
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if not _types:
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raise ValueError(
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f'No type-instance could be resolved from `type_names` ??\n'
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f'type_names: {type_names!r}\n'
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)
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return Union[*_types]
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def enc_type_union(
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union_or_type: Union[Type]|Type,
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) -> list[str]:
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'''
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Encode a type-union or single type to a list of type-name-strings
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ready for IPC interchange.
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'''
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type_strs: list[str] = []
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for typ in getattr(
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union_or_type,
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'__args__',
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{union_or_type,},
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):
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type_strs.append(typ.__qualname__)
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return type_strs
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