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import asyncio |
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import json |
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import typing |
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import weakref |
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from aiohttp import http_websocket, web, web_ws |
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from .base import BaseJsonRpcServer |
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from .. import errors, protocol, utils |
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__all__ = ( |
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'WsJsonRpcServer', |
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) |
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class WsJsonRpcServer(BaseJsonRpcServer): |
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rcp_websockets: weakref.WeakSet |
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_json_response_handler: typing.Optional[typing.Callable] = None |
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def __init__(self, |
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*args, |
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json_response_handler: typing.Optional[typing.Callable] = None, |
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**kwargs) -> None: |
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super().__init__(*args, **kwargs) |
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self.rcp_websockets = weakref.WeakSet() |
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self._json_response_handler = json_response_handler |
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async def handle_http_request(self, http_request: web.Request) -> web.StreamResponse: |
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if http_request.method != 'GET' or http_request.headers.get('upgrade', '').lower() != 'websocket': |
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raise web.HTTPMethodNotAllowed(method=http_request.method, allowed_methods=('GET',)) |
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return await self._handle_ws_request(http_request) |
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async def on_shutdown(self, app: web.Application) -> None: |
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# https://docs.aiohttp.org/en/stable/web_advanced.html#graceful-shutdown |
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for ws in self.rcp_websockets: |
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await ws.close(code=http_websocket.WSCloseCode.GOING_AWAY, message='Server shutdown') |
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self.rcp_websockets.clear() |
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async def _handle_ws_request(self, http_request: web.Request) -> web_ws.WebSocketResponse: |
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from aiohttp_rpc import WsJsonRpcClient |
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ws_connect = web_ws.WebSocketResponse() |
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await ws_connect.prepare(http_request) |
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self.rcp_websockets.add(ws_connect) |
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ws_rpc_client = WsJsonRpcClient(ws_connect=ws_connect) |
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async for ws_msg in ws_connect: |
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if ws_msg.type != http_websocket.WSMsgType.TEXT: |
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continue |
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coro = self._handle_ws_message( |
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ws_msg=ws_msg, |
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ws_connect=ws_connect, |
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context={ |
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'http_request': http_request, |
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'ws_connect': ws_connect, |
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'ws_rpc_client': ws_rpc_client, |
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}, |
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) |
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asyncio.ensure_future(coro) # TODO: asyncio.create_task(coro) in Python 3.7+ |
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return ws_connect |
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async def _handle_ws_message(self, |
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ws_msg: web_ws.WSMessage, *, |
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ws_connect: web_ws.WebSocketResponse, |
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context: dict) -> None: |
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try: |
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input_data = json.loads(ws_msg.data) |
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except json.JSONDecodeError as e: |
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response = protocol.JsonRpcResponse(error=errors.ParseError(utils.get_exc_message(e))) |
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json_response = response.to_dict() |
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else: |
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json_response = await self._process_input_data(input_data, context=context) |
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if json_response is None: |
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return |
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if ws_connect.closed: |
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raise errors.ServerError('WS is closed.') |
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await ws_connect.send_str(self.json_serialize(json_response)) |
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expert-m /
aiohttp-rpc
