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Add type hints for ObservableDeferred attributes (#12159)

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Signed-off-by: Sean Quah <seanq@element.io>
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Sean Quah 2022-03-04 15:37:02 +00:00 committed by GitHub
parent 158e0937eb
commit 75574726a7
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2 changed files with 12 additions and 3 deletions
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1
changelog.d/12159.misc Normal file
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@ -0,0 +1 @@
Add type hints for `ObservableDeferred` attributes.

14
synapse/util/async_helpers.py
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@ -40,7 +40,7 @@ from typing import (
) )
import attr import attr
from typing_extensions import ContextManager from typing_extensions import ContextManager, Literal
from twisted.internet import defer from twisted.internet import defer
from twisted.internet.defer import CancelledError from twisted.internet.defer import CancelledError
@ -96,6 +96,10 @@ class ObservableDeferred(Generic[_T], AbstractObservableDeferred[_T]):
__slots__ = ["_deferred", "_observers", "_result"] __slots__ = ["_deferred", "_observers", "_result"]
_deferred: "defer.Deferred[_T]"
_observers: Union[List["defer.Deferred[_T]"], Tuple[()]]
_result: Union[None, Tuple[Literal[True], _T], Tuple[Literal[False], Failure]]
def __init__(self, deferred: "defer.Deferred[_T]", consumeErrors: bool = False): def __init__(self, deferred: "defer.Deferred[_T]", consumeErrors: bool = False):
object.__setattr__(self, "_deferred", deferred) object.__setattr__(self, "_deferred", deferred)
object.__setattr__(self, "_result", None) object.__setattr__(self, "_result", None)
@ -158,12 +162,14 @@ class ObservableDeferred(Generic[_T], AbstractObservableDeferred[_T]):
effect the underlying deferred. effect the underlying deferred.
""" """
if not self._result: if not self._result:
assert isinstance(self._observers, list)
d: "defer.Deferred[_T]" = defer.Deferred() d: "defer.Deferred[_T]" = defer.Deferred()
self._observers.append(d) self._observers.append(d)
return d return d
elif self._result[0]:
return defer.succeed(self._result[1])
else: else:
success, res = self._result return defer.fail(self._result[1])
return defer.succeed(res) if success else defer.fail(res)
def observers(self) -> "Collection[defer.Deferred[_T]]": def observers(self) -> "Collection[defer.Deferred[_T]]":
return self._observers return self._observers
@ -175,6 +181,8 @@ class ObservableDeferred(Generic[_T], AbstractObservableDeferred[_T]):
return self._result is not None and self._result[0] is True return self._result is not None and self._result[0] is True
def get_result(self) -> Union[_T, Failure]: def get_result(self) -> Union[_T, Failure]:
if self._result is None:
raise ValueError(f"{self!r} has no result yet")
return self._result[1] return self._result[1]
def __getattr__(self, name: str) -> Any: def __getattr__(self, name: str) -> Any: