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import abc |
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import asyncio |
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import typing |
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from aiohttp import web |
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from .. import constants, errors, middlewares as rpc_middleware, protocol, utils |
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__all__ = ( |
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'BaseJsonRpcServer', |
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) |
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class BaseJsonRpcServer(abc.ABC): |
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methods: typing.Dict[str, protocol.JsonRpcMethod] |
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middlewares: typing.Tuple[typing.Type[rpc_middleware.BaseJsonRpcMiddleware], ...] |
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json_serialize: typing.Callable |
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_middleware_chain: typing.Callable |
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def __init__(self, *, |
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json_serialize: typing.Callable = utils.json_serialize, |
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middlewares: typing.Iterable = (), |
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methods: typing.Optional[typing.Dict[str, protocol.JsonRpcMethod]] = None) -> None: |
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if methods is None: |
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methods = {'get_methods': protocol.JsonRpcMethod('', self.get_methods)} |
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self.methods = methods |
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self.middlewares = tuple(middlewares) |
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self.load_middlewares() |
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self.json_serialize = json_serialize |
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def load_middlewares(self): |
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self._middleware_chain = self._process_single_request |
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for middleware_class in reversed(self.middlewares): |
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if isinstance(middleware_class, (list, tuple,)): |
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middleware_class, kwargs = middleware_class |
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self._middleware_chain = middleware_class(server=self, get_response=self._middleware_chain, **kwargs) |
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continue |
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self._middleware_chain = middleware_class(server=self, get_response=self._middleware_chain) |
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def add_method(self, |
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method: typing.Union[protocol.JsonRpcMethod, tuple, list, typing.Callable], *, |
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replace: bool = False) -> protocol.JsonRpcMethod: |
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if not isinstance(method, protocol.JsonRpcMethod): |
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if callable(method): |
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method = protocol.JsonRpcMethod('', method) |
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else: |
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method = protocol.JsonRpcMethod(*method) |
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if not replace and method.name in self.methods: |
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raise errors.InvalidParams(f'Method {method.name} has already been added.') |
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self.methods[method.name] = method |
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return method |
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def add_methods(self, |
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methods: typing.Iterable[typing.Union[protocol.JsonRpcMethod, tuple, list, typing.Callable]], *, |
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replace: bool = False) -> typing.List[protocol.JsonRpcMethod]: |
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return [ |
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self.add_method(method, replace=replace) |
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for method in methods |
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] |
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async def call(self, |
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method: str, *, |
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args: typing.Optional[list] = None, |
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kwargs: typing.Optional[dict] = None, |
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extra_args: typing.Optional[dict] = None) -> typing.Any: |
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if args is None: |
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args = [] |
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if kwargs is None: |
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kwargs = {} |
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if method not in self.methods: |
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raise errors.MethodNotFound |
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return await self.methods[method](args=args, kwargs=kwargs, extra_args=extra_args) |
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def get_methods(self) -> dict: |
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return { |
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name: { |
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'doc': method.func.__doc__, |
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'args': method.supported_args, |
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'kwargs': method.supported_kwargs, |
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} |
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for name, method in self.methods.items() |
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} |
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async def _process_input_data(self, |
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data: typing.Union[dict, list], *, |
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http_request: typing.Optional[web.Request] = None) -> typing.Any: |
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if isinstance(data, list): |
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json_responses = await asyncio.gather(*( |
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self._process_single_json_request(raw_rcp_request, http_request=http_request) |
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for raw_rcp_request in data |
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), return_exceptions=True) |
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for i, json_response in enumerate(json_responses): |
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if isinstance(json_response, errors.JsonRpcError): |
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json_responses[i] = protocol.JsonRpcResponse(error=json_response) |
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elif isinstance(json_response, Exception): |
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json_responses[i] = protocol.JsonRpcResponse( |
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error=errors.JsonRpcError(utils.get_exc_message(json_response)), |
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) |
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return json_responses |
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if isinstance(data, dict): |
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return await self._process_single_json_request(data, http_request=http_request) |
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response = protocol.JsonRpcResponse(error=errors.ParseError('Data must be a dict or an list.')) |
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return response.to_dict() |
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async def _process_single_json_request(self, |
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json_request: dict, *, |
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http_request: typing.Optional[web.Request] = None) -> dict: |
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if not isinstance(json_request, dict): |
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raise errors.ParseError('Data must be a dict or an list.') |
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msg_id = json_request.get('id') |
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try: |
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request = protocol.JsonRpcRequest.from_dict(json_request, context={'http_request': http_request}) |
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except errors.JsonRpcError as e: |
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response = protocol.JsonRpcResponse(msg_id=msg_id, error=e) |
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return response.to_dict() |
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response = await self._middleware_chain(request) |
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return response.to_dict() |
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async def _process_single_request(self, request: protocol.JsonRpcRequest) -> protocol.JsonRpcResponse: |
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result, error = constants.NOTHING, constants.NOTHING |
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141
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try: |
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result = await self.call( |
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request.method, |
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args=request.args, |
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kwargs=request.kwargs, |
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extra_args=request.extra_args, |
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) |
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except errors.JsonRpcError as e: |
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error = e |
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response = protocol.JsonRpcResponse( |
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msg_id=request.msg_id, |
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jsonrpc=request.jsonrpc, |
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result=result, |
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error=error, |
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) |
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return response |
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expert-m /
aiohttp-rpc
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