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#!/usr/bin/env python3
"""Example for aiohttp.web websocket server."""
# The extra strict mypy settings are here to help test that `Application[AppKey()]`
# syntax is working correctly. A regression will cause mypy to raise an error.
# mypy: disallow-any-expr, disallow-any-unimported, disallow-subclassing-any
import os
from typing import List
from aiohttp import web
WS_FILE = os.path.join(os.path.dirname(__file__), "websocket.html")
sockets = web.AppKey("sockets", List[web.WebSocketResponse])
async def wshandler(request: web.Request) -> web.StreamResponse:
resp = web.WebSocketResponse()
available = resp.can_prepare(request)
if not available:
with open(WS_FILE, "rb") as fp:
return web.Response(body=fp.read(), content_type="text/html")
await resp.prepare(request)
await resp.send_str("Welcome!!!")
try:
print("Someone joined.")
for ws in request.app[sockets]:
await ws.send_str("Someone joined")
request.app[sockets].append(resp)
async for msg in resp: # type: ignore[misc]
if msg.type == web.WSMsgType.TEXT: # type: ignore[misc]
for ws in request.app[sockets]:
if ws is not resp:
await ws.send_str(msg.data) # type: ignore[misc]
else:
return resp
return resp
finally:
request.app[sockets].remove(resp)
print("Someone disconnected.")
for ws in request.app[sockets]:
await ws.send_str("Someone disconnected.")
async def on_shutdown(app: web.Application) -> None:
for ws in app[sockets]:
await ws.close()
def init() -> web.Application:
app = web.Application()
l: List[web.WebSocketResponse] = []
app[sockets] = l
app.router.add_get("/", wshandler)
app.on_shutdown.append(on_shutdown)
return app
web.run_app(init())
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