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dbus_proxy_async_property.py
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318 lines (262 loc) · 9.81 KB
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# SPDX-License-Identifier: LGPL-2.1-or-later
# Copyright (C) 2020-2023 igo95862
# This file is part of python-sdbus
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
from __future__ import annotations
from collections.abc import Awaitable
from inspect import iscoroutinefunction
from types import FunctionType
from typing import TYPE_CHECKING, Generic, TypeVar, cast, overload
from weakref import ref as weak_ref
from .dbus_common_elements import (
DbusBoundAsync,
DbusMemberAsync,
DbusPropertyCommon,
DbusPropertyOverride,
DbusRemoteObjectMeta,
)
if TYPE_CHECKING:
from collections.abc import Callable, Generator
from typing import Any, Optional, Union
from .dbus_proxy_async_interface_base import DbusInterfaceBaseAsync
from .sd_bus_internals import SdBusMessage
T = TypeVar('T')
class DbusPropertyAsync(DbusMemberAsync, DbusPropertyCommon, Generic[T]):
def __init__(
self,
property_name: Optional[str],
property_signature: str,
property_getter: Callable[[DbusInterfaceBaseAsync],
T],
property_setter: Optional[
Callable[[DbusInterfaceBaseAsync, T],
None]],
flags: int,
) -> None:
assert isinstance(property_getter, FunctionType)
super().__init__(
property_name,
property_signature,
flags,
property_getter,
)
self.property_getter: Callable[
[DbusInterfaceBaseAsync], T] = property_getter
self.property_setter: Optional[
Callable[[DbusInterfaceBaseAsync, T],
None]] = property_setter
self.property_setter_is_public: bool = True
self.__doc__ = property_getter.__doc__
@overload
def __get__(
self,
obj: None,
obj_class: type[DbusInterfaceBaseAsync],
) -> DbusPropertyAsync[T]:
...
@overload
def __get__(
self,
obj: DbusInterfaceBaseAsync,
obj_class: type[DbusInterfaceBaseAsync],
) -> DbusBoundPropertyAsyncBase[T]:
...
def __get__(
self,
obj: Optional[DbusInterfaceBaseAsync],
obj_class: Optional[type[DbusInterfaceBaseAsync]] = None,
) -> Union[DbusBoundPropertyAsyncBase[T], DbusPropertyAsync[T]]:
if obj is not None:
dbus_meta = obj._dbus
if isinstance(dbus_meta, DbusRemoteObjectMeta):
return DbusProxyPropertyAsync(self, dbus_meta)
else:
return DbusLocalPropertyAsync(self, obj)
else:
return self
def setter(self,
new_set_function: Callable[
[Any, T],
None],
) -> None:
assert self.property_setter is None, "Setter already defined"
assert not iscoroutinefunction(new_set_function), (
"Property setter can't be coroutine",
)
self.property_setter = new_set_function
def setter_private(
self,
new_set_function: Callable[
[Any, T],
None],
) -> None:
assert self.property_setter is None, "Setter already defined"
assert not iscoroutinefunction(new_set_function), (
"Property setter can't be coroutine",
)
self.property_setter = new_set_function
self.property_setter_is_public = False
class DbusBoundPropertyAsyncBase(DbusBoundAsync, Awaitable[T]):
def __await__(self) -> Generator[Any, None, T]:
return self.get_async().__await__()
async def get_async(self) -> T:
raise NotImplementedError
async def set_async(self, complete_object: T) -> None:
raise NotImplementedError
class DbusProxyPropertyAsync(DbusBoundPropertyAsyncBase[T]):
def __init__(
self,
dbus_property: DbusPropertyAsync[T],
proxy_meta: DbusRemoteObjectMeta,
):
self.dbus_property = dbus_property
self.proxy_meta = proxy_meta
self.__doc__ = dbus_property.__doc__
async def get_async(self) -> T:
bus = self.proxy_meta.attached_bus
new_get_message = (
bus.new_property_get_message(
self.proxy_meta.service_name,
self.proxy_meta.object_path,
self.dbus_property.interface_name,
self.dbus_property.property_name,
)
)
reply_message = await bus.call_async(new_get_message)
# Get method returns variant but we only need contents of variant
return cast(T, reply_message.get_contents()[1])
async def set_async(self, complete_object: T) -> None:
bus = self.proxy_meta.attached_bus
new_set_message = (
bus.new_property_set_message(
self.proxy_meta.service_name,
self.proxy_meta.object_path,
self.dbus_property.interface_name,
self.dbus_property.property_name,
)
)
new_set_message.append_data(
'v',
(self.dbus_property.property_signature, complete_object),
)
await bus.call_async(new_set_message)
class DbusLocalPropertyAsync(DbusBoundPropertyAsyncBase[T]):
def __init__(
self,
dbus_property: DbusPropertyAsync[T],
local_object: DbusInterfaceBaseAsync,
):
self.dbus_property = dbus_property
self.local_object_ref = weak_ref(local_object)
self.__doc__ = dbus_property.__doc__
async def get_async(self) -> T:
local_object = self.local_object_ref()
if local_object is None:
raise RuntimeError("Local object no longer exists!")
return self.dbus_property.property_getter(local_object)
async def set_async(self, complete_object: T) -> None:
if self.dbus_property.property_setter is None:
raise RuntimeError("Property has no setter")
local_object = self.local_object_ref()
if local_object is None:
raise RuntimeError("Local object no longer exists!")
self.dbus_property.property_setter(
local_object,
complete_object,
)
try:
properties_changed = getattr(
local_object,
"properties_changed",
)
except AttributeError:
...
else:
properties_changed.emit(
(
self.dbus_property.interface_name,
{
self.dbus_property.property_name: (
self.dbus_property.property_signature,
complete_object,
),
},
[]
)
)
def _dbus_reply_get(self, message: SdBusMessage) -> None:
local_object = self.local_object_ref()
if local_object is None:
raise RuntimeError("Local object no longer exists!")
reply_data: Any = self.dbus_property.property_getter(local_object)
message.append_data(self.dbus_property.property_signature, reply_data)
def _dbus_reply_set(self, message: SdBusMessage) -> None:
local_object = self.local_object_ref()
if local_object is None:
raise RuntimeError("Local object no longer exists!")
assert self.dbus_property.property_setter is not None
data_to_set_to: Any = message.get_contents()
self.dbus_property.property_setter(local_object, data_to_set_to)
try:
properties_changed = getattr(
local_object,
"properties_changed",
)
except AttributeError:
...
else:
properties_changed.emit(
(
self.dbus_property.interface_name,
{
self.dbus_property.property_name: (
self.dbus_property.property_signature,
data_to_set_to,
),
},
[]
)
)
def dbus_property_async(
property_signature: str = "",
flags: int = 0,
property_name: Optional[str] = None,
) -> Callable[
[Callable[[Any], T]],
DbusPropertyAsync[T]]:
assert not isinstance(property_signature, FunctionType), (
"Passed function to decorator directly. "
"Did you forget () round brackets?"
)
def property_decorator(
function: Callable[..., Any]
) -> DbusPropertyAsync[T]:
assert not iscoroutinefunction(function), (
"Property getter can't be coroutine",
)
new_wrapper: DbusPropertyAsync[T] = DbusPropertyAsync(
property_name,
property_signature,
function,
None,
flags,
)
return new_wrapper
return property_decorator
def dbus_property_async_override() -> Callable[
[Callable[[Any], T]],
DbusPropertyAsync[T]]:
def new_decorator(
new_property: Callable[[Any], T]) -> DbusPropertyAsync[T]:
return cast(DbusPropertyAsync[T], DbusPropertyOverride(new_property))
return new_decorator