mirror of
https://github.com/nonebot/nonebot2.git
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305 lines
9.0 KiB
Python
305 lines
9.0 KiB
Python
"""
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FastAPI 驱动适配
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================
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后端使用方法请参考: `FastAPI 文档`_
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.. _FastAPI 文档:
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https://fastapi.tiangolo.com/
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"""
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import json
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import asyncio
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import logging
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from typing import List, Optional, Callable
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import uvicorn
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from pydantic import BaseSettings
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from fastapi.responses import Response
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from fastapi import status, Request, FastAPI, HTTPException
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from starlette.websockets import WebSocketDisconnect, WebSocket as FastAPIWebSocket
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from nonebot.log import logger
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from nonebot.typing import overrides
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from nonebot.utils import DataclassEncoder
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from nonebot.exception import RequestDenied
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from nonebot.config import Env, Config as NoneBotConfig
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from nonebot.drivers import Driver as BaseDriver, WebSocket as BaseWebSocket
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class Config(BaseSettings):
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"""
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FastAPI 驱动框架设置，详情参考 FastAPI 文档
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"""
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fastapi_openapi_url: Optional[str] = None
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"""
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:类型:
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``Optional[str]``
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:说明:
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``openapi.json`` 地址，默认为 ``None`` 即关闭
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"""
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fastapi_docs_url: Optional[str] = None
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"""
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:类型:
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``Optional[str]``
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:说明:
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``swagger`` 地址，默认为 ``None`` 即关闭
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"""
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fastapi_redoc_url: Optional[str] = None
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"""
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:类型:
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``Optional[str]``
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:说明:
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``redoc`` 地址，默认为 ``None`` 即关闭
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"""
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fastapi_reload_dirs: List[str] = []
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"""
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:类型:
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``List[str]``
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:说明:
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``debug`` 模式下重载监控文件夹列表，默认为 uvicorn 默认值
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"""
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class Config:
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extra = "ignore"
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class Driver(BaseDriver):
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"""
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FastAPI 驱动框架
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:上报地址:
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* ``/{adapter name}/``: HTTP POST 上报
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* ``/{adapter name}/http/``: HTTP POST 上报
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* ``/{adapter name}/ws``: WebSocket 上报
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* ``/{adapter name}/ws/``: WebSocket 上报
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"""
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def __init__(self, env: Env, config: NoneBotConfig):
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super().__init__(env, config)
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self.fastapi_config = Config(**config.dict())
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self._server_app = FastAPI(
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debug=config.debug,
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openapi_url=self.fastapi_config.fastapi_openapi_url,
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docs_url=self.fastapi_config.fastapi_docs_url,
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redoc_url=self.fastapi_config.fastapi_redoc_url,
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)
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self._server_app.post("/{adapter}/")(self._handle_http)
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self._server_app.post("/{adapter}/http")(self._handle_http)
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self._server_app.websocket("/{adapter}/ws")(self._handle_ws_reverse)
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self._server_app.websocket("/{adapter}/ws/")(self._handle_ws_reverse)
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@property
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@overrides(BaseDriver)
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def type(self) -> str:
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"""驱动名称: ``fastapi``"""
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return "fastapi"
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@property
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@overrides(BaseDriver)
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def server_app(self) -> FastAPI:
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"""``FastAPI APP`` 对象"""
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return self._server_app
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@property
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@overrides(BaseDriver)
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def asgi(self):
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"""``FastAPI APP`` 对象"""
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return self._server_app
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@property
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@overrides(BaseDriver)
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def logger(self) -> logging.Logger:
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"""fastapi 使用的 logger"""
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return logging.getLogger("fastapi")
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@overrides(BaseDriver)
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def on_startup(self, func: Callable) -> Callable:
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"""参考文档: `Events <https://fastapi.tiangolo.com/advanced/events/#startup-event>`_"""
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return self.server_app.on_event("startup")(func)
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@overrides(BaseDriver)
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def on_shutdown(self, func: Callable) -> Callable:
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"""参考文档: `Events <https://fastapi.tiangolo.com/advanced/events/#startup-event>`_"""
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return self.server_app.on_event("shutdown")(func)
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@overrides(BaseDriver)
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def run(self,
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host: Optional[str] = None,
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port: Optional[int] = None,
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*,
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app: Optional[str] = None,
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**kwargs):
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"""使用 ``uvicorn`` 启动 FastAPI"""
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super().run(host, port, app, **kwargs)
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LOGGING_CONFIG = {
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"version": 1,
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"disable_existing_loggers": False,
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"handlers": {
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"default": {
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"class": "nonebot.log.LoguruHandler",
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},
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},
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"loggers": {
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"uvicorn.error": {
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"handlers": ["default"],
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"level": "INFO"
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},
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"uvicorn.access": {
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"handlers": ["default"],
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"level": "INFO",
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},
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},
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}
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uvicorn.run(app or self.server_app,
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host=host or str(self.config.host),
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port=port or self.config.port,
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reload=bool(app) and self.config.debug,
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reload_dirs=self.fastapi_config.fastapi_reload_dirs or None,
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debug=self.config.debug,
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log_config=LOGGING_CONFIG,
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**kwargs)
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@overrides(BaseDriver)
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async def _handle_http(self, adapter: str, request: Request):
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data = await request.body()
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data_dict = json.loads(data.decode())
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if not isinstance(data_dict, dict):
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logger.warning("Data received is invalid")
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raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST)
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if adapter not in self._adapters:
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logger.warning(
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f"Unknown adapter {adapter}. Please register the adapter before use."
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)
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raise HTTPException(status_code=status.HTTP_404_NOT_FOUND,
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detail="adapter not found")
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# 创建 Bot 对象
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BotClass = self._adapters[adapter]
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headers = dict(request.headers)
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try:
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x_self_id = await BotClass.check_permission(self, "http", headers,
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data)
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except RequestDenied as e:
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raise HTTPException(status_code=e.status_code,
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detail=e.reason) from None
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if x_self_id in self._clients:
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logger.warning("There's already a reverse websocket connection,"
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"so the event may be handled twice.")
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bot = BotClass("http", x_self_id)
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asyncio.create_task(bot.handle_message(data_dict))
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return Response("", 204)
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@overrides(BaseDriver)
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async def _handle_ws_reverse(self, adapter: str,
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websocket: FastAPIWebSocket):
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ws = WebSocket(websocket)
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if adapter not in self._adapters:
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logger.warning(
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f"Unknown adapter {adapter}. Please register the adapter before use."
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)
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await ws.close(code=status.WS_1008_POLICY_VIOLATION)
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return
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# Create Bot Object
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BotClass = self._adapters[adapter]
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headers = dict(websocket.headers)
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try:
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x_self_id = await BotClass.check_permission(self, "websocket",
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headers, None)
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except RequestDenied:
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await ws.close(code=status.WS_1008_POLICY_VIOLATION)
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return
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if x_self_id in self._clients:
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logger.opt(colors=True).warning(
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"There's already a reverse websocket connection, "
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f"<y>{adapter.upper()} Bot {x_self_id}</y> ignored.")
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await ws.close(code=status.WS_1008_POLICY_VIOLATION)
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return
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bot = BotClass("websocket", x_self_id, websocket=ws)
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await ws.accept()
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logger.opt(colors=True).info(
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f"WebSocket Connection from <y>{adapter.upper()} "
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f"Bot {x_self_id}</y> Accepted!")
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self._bot_connect(bot)
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try:
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while not ws.closed:
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data = await ws.receive()
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if not data:
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continue
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asyncio.create_task(bot.handle_message(data))
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finally:
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self._bot_disconnect(bot)
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class WebSocket(BaseWebSocket):
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def __init__(self, websocket: FastAPIWebSocket):
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super().__init__(websocket)
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self._closed = False
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@property
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@overrides(BaseWebSocket)
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def closed(self):
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return self._closed
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@overrides(BaseWebSocket)
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async def accept(self):
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await self.websocket.accept()
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self._closed = False
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@overrides(BaseWebSocket)
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async def close(self, code: int = status.WS_1000_NORMAL_CLOSURE):
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await self.websocket.close(code=code)
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self._closed = True
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@overrides(BaseWebSocket)
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async def receive(self) -> Optional[dict]:
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data = None
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try:
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data = await self.websocket.receive_json()
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if not isinstance(data, dict):
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data = None
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raise ValueError
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except ValueError:
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logger.warning("Received an invalid json message.")
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except WebSocketDisconnect:
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self._closed = True
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logger.error("WebSocket disconnected by peer.")
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return data
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@overrides(BaseWebSocket)
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async def send(self, data: dict) -> None:
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text = json.dumps(data, cls=DataclassEncoder)
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await self.websocket.send({"type": "websocket.send", "text": text})
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