forked from mirrors/gecko-dev
fcfe38a1ef
Update `aiohttp` to version 3.8.5 and `requests` to version 2.31.0, and vendor their respective dependencies. Add all the new dependencies to the various required site virtualenv requirements files. Differential Revision: https://phabricator.services.mozilla.com/D188904
66 lines
1.8 KiB
Python
Executable file
66 lines
1.8 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
"""Example of aiohttp.web.Application.on_startup signal handler"""
|
|
import asyncio
|
|
|
|
import aioredis
|
|
|
|
from aiohttp import web
|
|
|
|
|
|
async def websocket_handler(request):
|
|
ws = web.WebSocketResponse()
|
|
await ws.prepare(request)
|
|
request.app["websockets"].append(ws)
|
|
try:
|
|
async for msg in ws:
|
|
print(msg)
|
|
await asyncio.sleep(1)
|
|
finally:
|
|
request.app["websockets"].remove(ws)
|
|
return ws
|
|
|
|
|
|
async def on_shutdown(app):
|
|
for ws in app["websockets"]:
|
|
await ws.close(code=999, message="Server shutdown")
|
|
|
|
|
|
async def listen_to_redis(app):
|
|
try:
|
|
sub = await aioredis.create_redis(("localhost", 6379), loop=app.loop)
|
|
ch, *_ = await sub.subscribe("news")
|
|
async for msg in ch.iter(encoding="utf-8"):
|
|
# Forward message to all connected websockets:
|
|
for ws in app["websockets"]:
|
|
await ws.send_str(f"{ch.name}: {msg}")
|
|
print(f"message in {ch.name}: {msg}")
|
|
except asyncio.CancelledError:
|
|
pass
|
|
finally:
|
|
print("Cancel Redis listener: close connection...")
|
|
await sub.unsubscribe(ch.name)
|
|
await sub.quit()
|
|
print("Redis connection closed.")
|
|
|
|
|
|
async def start_background_tasks(app: web.Application) -> None:
|
|
app["redis_listener"] = asyncio.create_task(listen_to_redis(app))
|
|
|
|
|
|
async def cleanup_background_tasks(app):
|
|
print("cleanup background tasks...")
|
|
app["redis_listener"].cancel()
|
|
await app["redis_listener"]
|
|
|
|
|
|
def init():
|
|
app = web.Application()
|
|
app["websockets"] = []
|
|
app.router.add_get("/news", websocket_handler)
|
|
app.on_startup.append(start_background_tasks)
|
|
app.on_cleanup.append(cleanup_background_tasks)
|
|
app.on_shutdown.append(on_shutdown)
|
|
return app
|
|
|
|
|
|
web.run_app(init())
|