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import re
from falcon.asgi import Request
from falcon.asgi import WebSocket
from .hub import Hub
class Chat:
ALL = re.compile(r'^/all\s+(.+)$')
MSG = re.compile(r'^/msg\s+(\w+)\s+(.+)$')
def __init__(self, hub: Hub):
self._hub = hub
async def on_websocket(self, req: Request, ws: WebSocket, name: str) -> None:
await ws.accept()
try:
await self._hub.broadcast(f'{name} CONNECTED')
self._hub.add_user(name, ws)
await ws.send_text(f'Hello, {name}!')
while True:
message = await ws.receive_text()
if message == '/quit':
await ws.send_text(f'Bye, {name}!')
await ws.close(4001, 'quit command')
break
command = self.ALL.match(message)
if command:
text = command.group(1)
await self._hub.broadcast(f'[{name}] {text}')
continue
command = self.MSG.match(message)
if command:
recipient, text = command.groups()
await self._hub.message(recipient, f'[{name}] {text}')
continue
await ws.send_text('Supported commands: /all /msg /quit')
finally:
self._hub.remove_user(name)
await self._hub.broadcast(f'{name} DISCONNECTED')
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