mirror of
https://github.com/invoke-ai/InvokeAI
synced 2024-08-30 20:32:17 +00:00
45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
import asyncio
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import threading
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from fastapi_events.dispatcher import dispatch
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from invokeai.app.services.events.events_base import EventServiceBase
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from invokeai.app.services.events.events_common import EventBase
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class FastAPIEventService(EventServiceBase):
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def __init__(self, event_handler_id: int, loop: asyncio.AbstractEventLoop) -> None:
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self.event_handler_id = event_handler_id
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self._queue = asyncio.Queue[EventBase | None]()
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self._stop_event = threading.Event()
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self._loop = loop
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# We need to store a reference to the task so it doesn't get GC'd
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# See: https://docs.python.org/3/library/asyncio-task.html#creating-tasks
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self._background_tasks: set[asyncio.Task[None]] = set()
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task = self._loop.create_task(self._dispatch_from_queue(stop_event=self._stop_event))
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self._background_tasks.add(task)
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task.add_done_callback(self._background_tasks.remove)
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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._loop.call_soon_threadsafe(self._queue.put_nowait, None)
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def dispatch(self, event: EventBase) -> None:
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self._loop.call_soon_threadsafe(self._queue.put_nowait, event)
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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 = await self._queue.get()
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if not event: # Probably stopping
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continue
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# Leave the payloads as live pydantic models
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dispatch(event, middleware_id=self.event_handler_id, payload_schema_dump=False)
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except asyncio.CancelledError as e:
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raise e # Raise a proper error
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