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import abc
import functools
import weakref
from . import exc as async_exc
class ReversibleProxy:
# weakref.ref(async proxy object) -> weakref.ref(sync proxied object)
_proxy_objects = {}
__slots__ = ("__weakref__",)
def _assign_proxied(self, target):
if target is not None:
target_ref = weakref.ref(target, ReversibleProxy._target_gced)
proxy_ref = weakref.ref(
self,
functools.partial(ReversibleProxy._target_gced, target_ref),
)
ReversibleProxy._proxy_objects[target_ref] = proxy_ref
return target
@classmethod
def _target_gced(cls, ref, proxy_ref=None):
cls._proxy_objects.pop(ref, None)
@classmethod
def _regenerate_proxy_for_target(cls, target):
raise NotImplementedError()
@classmethod
def _retrieve_proxy_for_target(cls, target, regenerate=True):
try:
proxy_ref = cls._proxy_objects[weakref.ref(target)]
except KeyError:
pass
else:
proxy = proxy_ref()
if proxy is not None:
return proxy
if regenerate:
return cls._regenerate_proxy_for_target(target)
else:
return None
class StartableContext(abc.ABC):
__slots__ = ()
@abc.abstractmethod
async def start(self, is_ctxmanager=False):
pass
def __await__(self):
return self.start().__await__()
async def __aenter__(self):
return await self.start(is_ctxmanager=True)
@abc.abstractmethod
async def __aexit__(self, type_, value, traceback):
pass
def _raise_for_not_started(self):
raise async_exc.AsyncContextNotStarted(
"%s context has not been started and object has not been awaited."
% (self.__class__.__name__)
)
class ProxyComparable(ReversibleProxy):
__slots__ = ()
def __hash__(self):
return id(self)
def __eq__(self, other):
return (
isinstance(other, self.__class__)
and self._proxied == other._proxied
)
def __ne__(self, other):
return (
not isinstance(other, self.__class__)
or self._proxied != other._proxied
)
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