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https://github.com/unshackle-dl/unshackle.git
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77 lines
2.7 KiB
Python
77 lines
2.7 KiB
Python
from __future__ import annotations
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from copy import deepcopy
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from enum import Enum
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from typing import Any, Callable
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class Events:
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class Types(Enum):
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_reserved = 0
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# A Track's segment has finished downloading
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SEGMENT_DOWNLOADED = 1
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# Track has finished downloading
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TRACK_DOWNLOADED = 2
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# Track has finished decrypting
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TRACK_DECRYPTED = 3
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# Track has finished repacking
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TRACK_REPACKED = 4
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# Track is about to be Multiplexed into a Container
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TRACK_MULTIPLEX = 5
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def __init__(self):
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self.__subscriptions: dict[Events.Types, list[Callable]] = {}
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self.__ephemeral: dict[Events.Types, list[Callable]] = {}
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self.reset()
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def reset(self):
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"""Reset Event Observer clearing all Subscriptions."""
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self.__subscriptions = {k: [] for k in Events.Types.__members__.values()}
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self.__ephemeral = deepcopy(self.__subscriptions)
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def subscribe(self, event_type: Events.Types, callback: Callable, ephemeral: bool = False) -> None:
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"""
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Subscribe to an Event with a Callback.
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Parameters:
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event_type: The Events.Type to subscribe to.
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callback: The function or lambda to call on event emit.
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ephemeral: Unsubscribe the callback from the event on first emit.
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Note that this is not thread-safe and may be called multiple
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times at roughly the same time.
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"""
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[self.__subscriptions, self.__ephemeral][ephemeral][event_type].append(callback)
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def unsubscribe(self, event_type: Events.Types, callback: Callable) -> None:
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"""
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Unsubscribe a Callback from an Event.
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Parameters:
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event_type: The Events.Type to unsubscribe from.
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callback: The function or lambda to remove from event emit.
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"""
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if callback in self.__subscriptions[event_type]:
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self.__subscriptions[event_type].remove(callback)
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if callback in self.__ephemeral[event_type]:
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self.__ephemeral[event_type].remove(callback)
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def emit(self, event_type: Events.Types, *args: Any, **kwargs: Any) -> None:
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"""
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Emit an Event, executing all subscribed Callbacks.
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Parameters:
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event_type: The Events.Type to emit.
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args: Positional arguments to pass to callbacks.
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kwargs: Keyword arguments to pass to callbacks.
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"""
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if event_type not in self.__subscriptions:
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raise ValueError(f'Event type "{event_type}" is invalid')
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for callback in self.__subscriptions[event_type] + self.__ephemeral[event_type]:
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callback(*args, **kwargs)
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self.__ephemeral[event_type].clear()
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events = Events()
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