132 lines
4.3 KiB
Python
132 lines
4.3 KiB
Python
import asyncio
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import logging
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from collections.abc import Awaitable
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from .EventsSubscriber import Events
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from .Singleton import Singleton
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LOG = logging.getLogger("Emitter")
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class Emitter(metaclass=Singleton):
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"""
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This class is used to emit events to the registered emitters.
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"""
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emitters: list[(str, Awaitable)] = []
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"""The emitters for the events."""
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_instance = None
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def __init__(self):
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Emitter._instance = self
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@staticmethod
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def get_instance():
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"""
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Get the instance of the Emitter.
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Returns:
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Emitter: The instance of the Emitter
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"""
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if not Emitter._instance:
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Emitter._instance = Emitter()
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return Emitter._instance
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def add_emitter(self, emitter: list[Awaitable] | Awaitable, local: bool = False) -> "Emitter":
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"""
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Add an emitter to the list of emitters.
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Args:
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emitter (Awaitable|list[Awaitable]): The emitter function. The function must return a coroutine or None.
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local (bool): Mark the emitter as target for local events.
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Returns:
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Emitter: The instance of the Emitter
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"""
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if not isinstance(emitter, list):
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emitter = [emitter]
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for e in emitter:
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self.emitters.append((local, e))
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return self
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async def added(self, dl: dict, local: bool = False, **kwargs):
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await self.emit(Events.ADDED, data=dl, local=local, **kwargs)
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async def updated(self, dl: dict, local: bool = False, **kwargs):
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await self.emit(Events.UPDATED, data=dl, local=local, **kwargs)
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async def completed(self, dl: dict, local: bool = False, **kwargs):
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await self.emit(Events.COMPLETED, data=dl, local=local, **kwargs)
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async def cancelled(self, dl: dict, local: bool = False, **kwargs):
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await self.emit(Events.CANCELLED, data=dl, local=local, **kwargs)
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async def cleared(self, dl: dict | None = None, local: bool = False, **kwargs):
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await self.emit(Events.CLEARED, data=dl, local=local, **kwargs)
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async def error(self, message: str, data: dict|None = None, local: bool = False, **kwargs):
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msg = {"type": "error", "message": message, "data": {}}
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if data:
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msg.update({"data": data})
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await self.emit(Events.ERROR, data=msg, local=local, **kwargs)
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async def info(self, message: str, data: dict|None = None, local: bool = False, **kwargs):
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msg = {"type": "info", "message": message, "data": {}}
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if data:
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msg.update({"data": data})
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await self.emit(Events.LOG_INFO, data=msg, local=local, **kwargs)
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async def success(self, message: str, data: dict|None = None, local: bool = False, **kwargs):
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msg = {"type": "success", "message": message, "data": {}}
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if data:
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msg.update({"data": data})
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await self.emit(Events.LOG_SUCCESS, data=msg, local=local, **kwargs)
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async def emit(self, event: str, data, local: bool = False, **kwargs):
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"""
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Emit an event.
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Args:
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event (str): The event to emit.
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data (dict): The data to send with the event.
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local (bool): If the event should be sent to the local emitters only.
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kwargs: Additional arguments to pass to the emitters.
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Returns:
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None
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"""
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tasks = []
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for emitter in self.emitters:
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try:
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isLocal, callback = emitter
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if local and not isLocal:
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continue
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_ret = callback(event, data, **kwargs)
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if _ret:
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if isinstance(_ret, list):
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tasks.extend(_ret)
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else:
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tasks.append(_ret)
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except Exception as e:
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LOG.error(f"Emitter '{callback}' failed with error '{e}'.")
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if len(tasks) < 1:
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return
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try:
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await asyncio.wait_for(asyncio.gather(*tasks), timeout=60)
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except asyncio.CancelledError:
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LOG.error(f"Cancelled sending event '{event}'.")
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except TimeoutError:
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LOG.error(f"Timed out sending event '{event}'.")
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except Exception as e:
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LOG.exception(e)
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LOG.error(f"Failed to send event '{event}'. '{e!s}'.")
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