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80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
"""Mixin for mapping set/getattr to self.set/get"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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from __future__ import annotations
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import errno
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from typing import TypeVar, Union
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from .. import constants
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T = TypeVar("T")
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OptValT = Union[str, bytes, int]
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class AttributeSetter:
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def __setattr__(self, key: str, value: OptValT) -> None:
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"""set zmq options by attribute"""
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if key in self.__dict__:
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object.__setattr__(self, key, value)
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return
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# regular setattr only allowed for class-defined attributes
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for cls in self.__class__.mro():
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if key in cls.__dict__ or key in getattr(cls, "__annotations__", {}):
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object.__setattr__(self, key, value)
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return
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upper_key = key.upper()
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try:
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opt = getattr(constants, upper_key)
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except AttributeError:
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raise AttributeError(
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f"{self.__class__.__name__} has no such option: {upper_key}"
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)
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else:
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self._set_attr_opt(upper_key, opt, value)
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def _set_attr_opt(self, name: str, opt: int, value: OptValT) -> None:
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"""override if setattr should do something other than call self.set"""
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self.set(opt, value)
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def __getattr__(self, key: str) -> OptValT:
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"""get zmq options by attribute"""
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upper_key = key.upper()
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try:
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opt = getattr(constants, upper_key)
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except AttributeError:
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raise AttributeError(
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f"{self.__class__.__name__} has no such option: {upper_key}"
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) from None
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else:
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from zmq import ZMQError
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try:
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return self._get_attr_opt(upper_key, opt)
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except ZMQError as e:
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# EINVAL will be raised on access for write-only attributes.
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# Turn that into an AttributeError
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# necessary for mocking
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if e.errno in {errno.EINVAL, errno.EFAULT}:
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raise AttributeError(f"{key} attribute is write-only")
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else:
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raise
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def _get_attr_opt(self, name, opt) -> OptValT:
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"""override if getattr should do something other than call self.get"""
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return self.get(opt)
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def get(self, opt: int) -> OptValT:
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"""Override in subclass"""
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raise NotImplementedError("override in subclass")
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def set(self, opt: int, val: OptValT) -> None:
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"""Override in subclass"""
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raise NotImplementedError("override in subclass")
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__all__ = ['AttributeSetter']
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