PK!cafeteria/asyncio/__init__.pyPK!0J>MMcafeteria/asyncio/callbacks.pyfrom __future__ import annotations from asyncio import Task, iscoroutinefunction, create_task, get_running_loop from dataclasses import field, dataclass from enum import Enum from logging import getLogger from typing import List, Any, Dict, NoReturn from typing import Union, Generator, Callable, Coroutine, Tuple from cafeteria.logging import LoggedObject CallbackType = Union[Callable, Coroutine, "Callback"] CallbackResultType = Union[Task, Generator] logger = getLogger() @dataclass class Callback: function: CallbackType args: Tuple[Any] = field(default_factory=list) kwargs: Dict[str, Any] = field(default_factory=dict) def __init__(self, function, *args: Any, **kwargs: Any) -> None: super().__init__() self.function = function self.args = args self.kwargs = kwargs def trigger(self, *args: Any, **kwargs) -> CallbackResultType: """ Trigger this callback by prepending given positional arguments and merging given keyword arguments updating default keyword arguments. :param args: Positional arguments to prepend. :param kwargs: Keyword arguments to update defaults with. :return: An awaitable result. """ kwargz = dict(**self.kwargs) kwargz.update(kwargs) argz = args + self.args return trigger_callback(self.function, *argz, **kwargz) @dataclass class SimpleTriggerCallback(Callback): """ A callback dataclass implementation that allows for ignoring any additional arguments provided at the time of trigger. """ def __init__(self, function, *args: Any, **kwargs: Any) -> None: super().__init__(function, *args, **kwargs) def trigger(self, *_, **__) -> CallbackResultType: """ Trigger callback ignoring provided arguments. """ return super().trigger() def trigger_callback(callback: CallbackType, *args, **kwargs) -> CallbackResultType: """ Helper function to trigger a callback (coroutine or callable) with the provided positional/keyword arguments. This will return an awaitable callback result. :param callback: The callback to use for this trigger. This could be a `Coroutine`, `Callable` or a instance of `cafeteria.asyncio.callbacks.Callback`. :param args: The positional arguments to use when triggering a callback. :param kwargs: The keyword arguments to use when triggering a callback. :return: An awaitable result. """ if isinstance(callback, Callback): return callback.trigger(*args, **kwargs) try: if iscoroutinefunction(callback): return create_task(callback(*args, **kwargs)) else: return get_running_loop().run_in_executor( None, lambda: callback(*args, **kwargs) ) except RuntimeError: logger.warning( "Callback triggered without a running loop, skipping %s", callback ) class CallbackRegistry(LoggedObject): def __init__(self) -> None: self._callbacks: Dict[Enum, List[Callback]] = dict() def register(self, event_type: Enum, callback: CallbackType) -> NoReturn: """ This method allows for a handler to be registered for a specified event type. :param event_type: The type of event to associate the callback handler with. :param callback: The callback handler to associate with this event. """ if not isinstance(callback, Callback): callback = Callback(function=callback) if event_type not in self._callbacks: self._callbacks[event_type] = list() self._callbacks[event_type].append(callback) self.logger.debug("Registered %s to %s", event_type.value, callback) async def handle_event( self, event_type: Enum, *args: Any, **kwargs: Any ) -> NoReturn: """ Method called when an event is to be dispatched/handled. This arguments expects any additional positional/keyword arguments required when triggering the callback. :param event_type: :param args: Positional arguments to be passed into the callback before any pre-configured positional arguments. :param kwargs: Keyword arguments to be passed when triggering the callback. These override any pre-configured arguments. """ self.logger.debug("Received event %s", event_type.value) if event_type in self._callbacks: for callback in self._callbacks[event_type]: self.logger.debug("Executing callback %s", callback) _ = callback.trigger(*args, **kwargs) PK!Mcafeteria/asyncio/commons.pyimport asyncio import signal from asyncio import AbstractEventLoop async def cancel_all_tasks(event_loop: AbstractEventLoop = None): event_loop = event_loop or asyncio.get_running_loop() for task in asyncio.Task.all_tasks(event_loop): if task is asyncio.Task.current_task(): continue if not task.done(): task.cancel() await task event_loop.stop() def handle_signals(event_loop, *signames): for sig in {"SIGINT", "SIGTERM", *signames}: event_loop.add_signal_handler( getattr(signal, sig), lambda: asyncio.ensure_future(cancel_all_tasks()) ) PK!&cafeteria/asyncio/patterns/__init__.pyPK!G·)cafeteria/asyncio/patterns/application.pyimport asyncio from abc import abstractmethod from typing import NoReturn from cafeteria.asyncio.commons import handle_signals class AsyncioGracefulApplication: @abstractmethod async def main(self) -> NoReturn: """ The main method to execute for the application. The application runs until this completes or errors out. """ raise NotImplementedError def run(self): loop = asyncio.get_event_loop() handle_signals(loop) asyncio.new try: loop.run_until_complete(self.main()) except (asyncio.CancelledError, KeyboardInterrupt): loop.stop() finally: loop.close() PK!b cafeteria/asyncio/synchronous.pyimport asyncio from asyncio import Task from typing import Any, Coroutine, Union def execute_async_method(coroutine: Coroutine) -> Union[Any, Task]: try: loop = asyncio.get_event_loop() except RuntimeError: loop = asyncio.new_event_loop() if loop.is_running(): return loop.create_task(coroutine) else: return loop.run_until_complete(coroutine) PK!bE\,\,)cafeteria_asyncio-0.1.0.dist-info/LICENSE Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. 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See the License for the specific language governing permissions and limitations under the License.PK!HڽTU'cafeteria_asyncio-0.1.0.dist-info/WHEEL A н#Z;/"d&F[xzw@Zpy3Fv]\fi4WZ^EgM_-]#0(q7PK!H*cafeteria_asyncio-0.1.0.dist-info/METADATAU]O0}&Q8&EV@J(lhsz8]-xayI{=7gxO~m2dT)p'ܷZHC@}dRWwmFŸ:i04M-hstz BN@H@tjm]G.(Mk@5`c :ϝ)1*\ul+Rǯ;EX#4<(X9rdVV;w"}X{yx{C "$WÌ^5^ڭO xᤍ\1%JF^rCm.%̸y3fZ{euɪd~&AIʴy^zE,:;SBR1bmοj΋Ra xU Wg4WǬʛ٘\˝UJw5W3+-󓧿BPK!H ʏFb(cafeteria_asyncio-0.1.0.dist-info/RECORD˒0@- a 2"C 1H|OOtUͬnU䞋 w%0e=E& KAs,OG2O nN||,-_+*ye7VR_f!'|(-} \clS![* HgcF n >C`?3|0G1wGfSh!'bȁ6i@N$(HM9ބ=9KEy< 'G7ʒQ P?#okZ_^2Wno(E,7,7y Nv>Nrya '4˅?!gʁU8/#?ƵnM^N90(J2xC!\~ zqC]фIY/bf25 e<6 4C ofri  o{][|nd8ȃPK!cafeteria/asyncio/__init__.pyPK!0J>MM;cafeteria/asyncio/callbacks.pyPK!Mcafeteria/asyncio/commons.pyPK!&~cafeteria/asyncio/patterns/__init__.pyPK!G·)cafeteria/asyncio/patterns/application.pyPK!b cafeteria/asyncio/synchronous.pyPK!bE\,\,)cafeteria_asyncio-0.1.0.dist-info/LICENSEPK!HڽTU'/Gcafeteria_asyncio-0.1.0.dist-info/WHEELPK!H*Gcafeteria_asyncio-0.1.0.dist-info/METADATAPK!H ʏFb(Jcafeteria_asyncio-0.1.0.dist-info/RECORDPK 4L