lbry-sdk/lbry/wallet/server/websocket.py

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Python
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2019-07-18 03:50:20 +02:00
import asyncio
from weakref import WeakSet
from aiohttp.web import Application, AppRunner, WebSocketResponse, TCPSite
from aiohttp.http_websocket import WSMsgType, WSCloseCode
class AdminWebSocket:
def __init__(self, manager):
self.manager = manager
self.app = Application()
self.app['websockets'] = WeakSet()
self.app.router.add_get('/', self.on_connect)
self.app.on_shutdown.append(self.on_shutdown)
self.runner = AppRunner(self.app)
async def on_status(self, _):
if not self.app['websockets']:
return
self.send_message({
'type': 'status',
'height': self.manager.daemon.cached_height(),
})
def send_message(self, msg):
for web_socket in self.app['websockets']:
asyncio.create_task(web_socket.send_json(msg))
async def start(self):
await self.runner.setup()
await TCPSite(self.runner, self.manager.env.websocket_host, self.manager.env.websocket_port).start()
async def stop(self):
await self.runner.cleanup()
async def on_connect(self, request):
web_socket = WebSocketResponse()
await web_socket.prepare(request)
self.app['websockets'].add(web_socket)
try:
async for msg in web_socket:
if msg.type == WSMsgType.TEXT:
await self.on_status(None)
elif msg.type == WSMsgType.ERROR:
print('web socket connection closed with exception %s' %
web_socket.exception())
finally:
self.app['websockets'].discard(web_socket)
return web_socket
@staticmethod
async def on_shutdown(app):
for web_socket in set(app['websockets']):
await web_socket.close(code=WSCloseCode.GOING_AWAY, message='Server shutdown')