mirror of
https://github.com/invoke-ai/InvokeAI
synced 2024-08-30 20:32:17 +00:00
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
# Copyright (c) 2022 Kyle Schouviller (https://github.com/kyle0654)
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import asyncio
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import threading
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from queue import Empty, Queue
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from typing import Any
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from fastapi_events.dispatcher import dispatch
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from ..services.events import EventServiceBase
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class FastAPIEventService(EventServiceBase):
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event_handler_id: int
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__queue: Queue
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__stop_event: threading.Event
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def __init__(self, event_handler_id: int) -> None:
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self.event_handler_id = event_handler_id
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self.__queue = Queue()
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self.__stop_event = threading.Event()
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asyncio.create_task(self.__dispatch_from_queue(stop_event=self.__stop_event))
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super().__init__()
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def stop(self, *args, **kwargs):
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self.__stop_event.set()
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self.__queue.put(None)
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def dispatch(self, event_name: str, payload: Any) -> None:
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self.__queue.put(dict(event_name=event_name, payload=payload))
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async def __dispatch_from_queue(self, stop_event: threading.Event):
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"""Get events on from the queue and dispatch them, from the correct thread"""
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while not stop_event.is_set():
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try:
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event = self.__queue.get(block=False)
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if not event: # Probably stopping
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continue
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dispatch(
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event.get("event_name"),
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payload=event.get("payload"),
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middleware_id=self.event_handler_id,
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)
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except Empty:
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await asyncio.sleep(0.001)
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pass
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except asyncio.CancelledError as e:
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raise e # Raise a proper error
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