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fix: run Frigate+ API calls in thread pool to prevent event loop blocking

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The send_to_plus and set_false_positive handlers are async but call
synchronous PlusApi methods (which use the requests library) directly,
blocking the asyncio event loop for 10-16 seconds during image upload.
This stalls all other HTTP requests to Frigate.

Wrap upload_image, add_annotation, and add_false_positive calls in
asyncio.to_thread() so they run in a thread pool without blocking.

Fixes #16566
This commit is contained in:
Andy Warren 2026-03-13 15:39:06 -05:00
parent e873cd6837
commit 46632c28d6
1 changed files with 6 additions and 3 deletions
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9
frigate/api/event.py
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@ -1,5 +1,6 @@
"""Event apis."""
import asyncio
import base64
import datetime
import json
@ -11,7 +12,6 @@ from functools import reduce
from pathlib import Path
from typing import List
from urllib.parse import unquote
import asyncio
import cv2
import numpy as np
@ -1125,7 +1125,9 @@ async def send_to_plus(request: Request, event_id: str, body: SubmitPlusBody = N
)
try:
plus_id = await asyncio.to_thread(request.app.frigate_config.plus_api.upload_image, image, event.camera)
plus_id = await asyncio.to_thread(
request.app.frigate_config.plus_api.upload_image, image, event.camera
)
except Exception as ex:
logger.exception(ex)
return JSONResponse(
@ -1232,7 +1234,8 @@ async def false_positive(request: Request, event_id: str):
)
try:
request.app.frigate_config.plus_api.add_false_positive(
await asyncio.to_thread(
request.app.frigate_config.plus_api.add_false_positive,
event.plus_id,
region,
box,