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75 lines
2.5 KiB
Python
75 lines
2.5 KiB
Python
import asyncio
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import os
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import ssl
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import websockets
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from channels.generic.websocket import AsyncWebsocketConsumer
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from django.conf import settings
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from urllib.parse import quote
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class GatewayConnection:
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_ssl_context: ssl.SSLContext = None
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def __init__(self, host: str, port: int):
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if settings.CONNECTION_GATEWAY_AUTH_KEY and not GatewayConnection._ssl_context:
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ctx = ssl.create_default_context(purpose=ssl.Purpose.CLIENT_AUTH)
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ctx.load_cert_chain(
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os.path.realpath(settings.CONNECTION_GATEWAY_AUTH_CERTIFICATE),
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os.path.realpath(settings.CONNECTION_GATEWAY_AUTH_KEY),
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)
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if settings.CONNECTION_GATEWAY_AUTH_CA:
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ctx.load_verify_locations(
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cafile=os.path.realpath(settings.CONNECTION_GATEWAY_AUTH_CA),
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)
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ctx.verify_mode = ssl.CERT_REQUIRED
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GatewayConnection._ssl_context = ctx
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proto = 'wss' if GatewayConnection._ssl_context else 'ws'
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self.url = f'{proto}://localhost:9000/connect/{quote(host)}:{quote(str(port))}'
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async def connect(self):
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self.context = websockets.connect(self.url, ssl=GatewayConnection._ssl_context)
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self.socket = await self.context.__aenter__()
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async def send(self, data):
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await self.socket.send(data)
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def recv(self, timeout=None):
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return asyncio.wait_for(self.socket.recv(), timeout)
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async def close(self):
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await self.socket.close()
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await self.context.__aexit__(None, None, None)
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class TCPConsumer(AsyncWebsocketConsumer):
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async def connect(self):
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self.closed = False
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self.conn = GatewayConnection(
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self.scope['url_route']['kwargs']['host'],
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int(self.scope['url_route']['kwargs']['port']),
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)
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await self.conn.connect()
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await self.accept()
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self.reader = asyncio.get_event_loop().create_task(self.socket_reader())
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async def disconnect(self, close_code):
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self.closed = True
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await self.conn.close()
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async def receive(self, bytes_data):
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await self.conn.send(bytes_data)
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async def socket_reader(self):
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while True:
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if self.closed:
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return
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try:
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data = await self.conn.recv(timeout=10)
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except asyncio.TimeoutError:
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continue
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except websockets.exceptions.ConnectionClosed:
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await self.close()
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return
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await self.send(bytes_data=data)
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