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websocket.py
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websocket.py
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"""websocket transport"""
import asyncio
from aiohttp import web
try:
from asyncio import ensure_future
except ImportError:
ensure_future = asyncio.async
from .base import Transport
from ..exceptions import SessionIsClosed
from ..protocol import STATE_CLOSED, FRAME_CLOSE
from ..protocol import loads, close_frame
class WebSocketTransport(Transport):
@asyncio.coroutine
def server(self, ws, session):
while True:
try:
frame, data = yield from session._wait()
except SessionIsClosed:
break
ws.send_str(data)
if frame == FRAME_CLOSE:
try:
yield from ws.close()
finally:
yield from session._remote_closed()
@asyncio.coroutine
def client(self, ws, session):
while True:
msg = yield from ws.receive()
if msg.tp == web.MsgType.text:
data = msg.data
if not data:
continue
if data.startswith('['):
data = data[1:-1]
try:
text = loads(data)
except Exception as exc:
yield from session._remote_close(exc)
yield from session._remote_closed()
yield from ws.close(message=b'broken json')
break
yield from session._remote_message(text)
elif msg.tp == web.MsgType.close:
yield from session._remote_close()
elif msg.tp == web.MsgType.closed:
yield from session._remote_closed()
break
@asyncio.coroutine
def process(self):
# start websocket connection
ws = self.ws = web.WebSocketResponse()
yield from ws.prepare(self.request)
# session was interrupted
if self.session.interrupted:
self.ws.send_str(close_frame(1002, 'Connection interrupted'))
elif self.session.state == STATE_CLOSED:
self.ws.send_str(close_frame(3000, 'Go away!'))
else:
try:
yield from self.manager.acquire(self.session)
except: # should use specific exception
self.ws.send_str(close_frame(3000, 'Go away!'))
yield from ws.close()
return ws
server = ensure_future(
self.server(ws, self.session), loop=self.loop)
client = ensure_future(
self.client(ws, self.session), loop=self.loop)
try:
yield from asyncio.wait(
(server, client),
loop=self.loop,
return_when=asyncio.FIRST_COMPLETED)
except asyncio.CancelledError:
raise
except Exception as exc:
yield from self.session._remote_close(exc)
finally:
yield from self.manager.release(self.session)
if not server.done():
server.cancel()
if not client.done():
client.cancel()
return ws