mirror of
https://github.com/nonebot/nonebot2.git
synced 2024-11-28 08:12:14 +08:00
502 lines
17 KiB
Python
502 lines
17 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 asyncio
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import logging
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from dataclasses import dataclass
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from typing import List, Dict, Union, Optional, Callable
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import httpx
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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 websockets.exceptions import ConnectionClosed
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from fastapi import status, Request, FastAPI, HTTPException
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from websockets.legacy.client import Connect, WebSocketClientProtocol
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from starlette.websockets import (WebSocketState, WebSocketDisconnect, WebSocket
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as FastAPIWebSocket)
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from nonebot.log import logger
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from nonebot.adapters import Bot
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from nonebot.typing import overrides
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from nonebot.config import Env, Config as NoneBotConfig
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from nonebot.drivers import ReverseDriver, ForwardDriver
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from nonebot.drivers import HTTPRequest, WebSocket as BaseWebSocket
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@dataclass
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class HTTPPollingSetup:
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adapter: str
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self_id: str
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url: str
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method: str
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body: bytes
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headers: Dict[str, str]
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http_version: str
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poll_interval: float
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@dataclass
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class WebSocketSetup:
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adapter: str
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self_id: str
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url: str
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headers: Dict[str, str]
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http_version: str
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reconnect_interval: float
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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(ReverseDriver, ForwardDriver):
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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(**config.dict())
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self.http_pollings: List[HTTPPollingSetup] = []
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self.websockets: List[WebSocketSetup] = []
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self.shutdown: asyncio.Event = asyncio.Event()
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self.connections: List[asyncio.Task] = []
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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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self.on_startup(self._run_forward)
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self.on_shutdown(self._shutdown_forward)
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@property
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@overrides(ReverseDriver)
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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(ReverseDriver)
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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(ReverseDriver)
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def asgi(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(ReverseDriver)
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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(ReverseDriver)
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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(ReverseDriver)
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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(ForwardDriver)
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def setup_http_polling(self,
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adapter: str,
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self_id: str,
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url: str,
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polling_interval: float = 3.,
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method: str = "GET",
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body: bytes = b"",
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headers: Dict[str, str] = {},
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http_version: str = "1.1") -> None:
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self.http_pollings.append(
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HTTPPollingSetup(adapter, self_id, url, method, body, headers,
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http_version, polling_interval))
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@overrides(ForwardDriver)
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def setup_websocket(self,
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adapter: str,
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self_id: str,
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url: str,
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reconnect_interval: float = 3.,
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headers: Dict[str, str] = {},
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http_version: str = "1.1") -> None:
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self.websockets.append(
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WebSocketSetup(adapter, self_id, url, headers, http_version,
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reconnect_interval))
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@overrides(ReverseDriver)
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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(
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app or self.server_app, # type: ignore
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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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def _run_forward(self):
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for setup in self.http_pollings:
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self.connections.append(asyncio.create_task(self._http_loop(setup)))
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for setup in self.websockets:
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self.connections.append(asyncio.create_task(self._ws_loop(setup)))
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def _shutdown_forward(self):
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self.shutdown.set()
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for task in self.connections:
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if not task.done():
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task.cancel()
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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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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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http_request = HTTPRequest(request.scope["http_version"],
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request.url.scheme, request.url.path,
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request.scope["query_string"],
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dict(request.headers), request.method, data)
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x_self_id, response = await BotClass.check_permission(
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self, http_request)
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if not x_self_id:
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raise HTTPException(
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response and response.status or 401, response and
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response.body and response.body.decode("utf-8"))
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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(x_self_id, http_request)
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asyncio.create_task(bot.handle_message(data))
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return Response(response and response.body,
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response and response.status or 200)
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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.scope.get("http_version",
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"1.1"), websocket.url.scheme,
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websocket.url.path, websocket.scope["query_string"],
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dict(websocket.headers), 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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x_self_id, _ = await BotClass.check_permission(self, ws)
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if not x_self_id:
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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(x_self_id, 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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try:
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data = await ws.receive()
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except WebSocketDisconnect:
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logger.error("WebSocket disconnected by peer.")
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break
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except Exception as e:
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logger.opt(exception=e).error(
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"Error when receiving data from websocket.")
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break
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asyncio.create_task(bot.handle_message(data.encode()))
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finally:
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self._bot_disconnect(bot)
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async def _http_loop(self, setup: HTTPPollingSetup):
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url = httpx.URL(setup.url)
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if not url.netloc:
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logger.opt(colors=True).error(
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f"<r><bg #f8bbd0>Error parsing url {url}</bg #f8bbd0></r>")
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return
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request = HTTPRequest(
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setup.http_version, url.scheme, url.path, url.query, {
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**setup.headers, "host": url.netloc.decode("ascii")
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}, setup.method, setup.body)
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BotClass = self._adapters[setup.adapter]
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bot = BotClass(setup.self_id, request)
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self._bot_connect(bot)
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logger.opt(colors=True).info(
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f"Start http polling for <y>{setup.adapter.upper()} "
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f"Bot {setup.self_id}</y>")
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headers = request.headers
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http2: bool = False
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if request.http_version == "2":
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http2 = True
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try:
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async with httpx.AsyncClient(headers=headers,
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timeout=30.,
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http2=http2) as session:
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while not self.shutdown.is_set():
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logger.debug(
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f"Bot {setup.self_id} from adapter {setup.adapter} request {url}"
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)
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try:
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response = await session.request(request.method,
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url,
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content=request.body)
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response.raise_for_status()
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data = response.read()
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asyncio.create_task(bot.handle_message(data))
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except httpx.HTTPError as e:
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logger.opt(colors=True, exception=e).error(
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f"<r><bg #f8bbd0>Error occurred while requesting {url}. "
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"Try to reconnect...</bg #f8bbd0></r>")
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await asyncio.sleep(setup.poll_interval)
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except asyncio.CancelledError:
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pass
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Unexpected exception occurred "
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"while http polling</bg #f8bbd0></r>")
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finally:
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self._bot_disconnect(bot)
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async def _ws_loop(self, setup: WebSocketSetup):
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url = httpx.URL(setup.url)
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if not url.netloc:
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logger.opt(colors=True).error(
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f"<r><bg #f8bbd0>Error parsing url {url}</bg #f8bbd0></r>")
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return
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headers = {**setup.headers, "host": url.netloc.decode("ascii")}
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bot: Optional[Bot] = None
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try:
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while True:
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logger.debug(
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f"Bot {setup.self_id} from adapter {setup.adapter} connecting to {url}"
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)
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try:
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connection = Connect(setup.url)
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async with connection as ws:
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logger.opt(colors=True).info(
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f"WebSocket Connection to <y>{setup.adapter.upper()} "
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f"Bot {setup.self_id}</y> succeeded!")
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request = WebSocket(setup.http_version, url.scheme,
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url.path, url.query, headers, ws)
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BotClass = self._adapters[setup.adapter]
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bot = BotClass(setup.self_id, request)
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self._bot_connect(bot)
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while not self.shutdown.is_set():
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# use try except instead of "request.closed" because of queued message
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try:
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msg = await request.receive_bytes()
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asyncio.create_task(bot.handle_message(msg))
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except ConnectionClosed:
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logger.opt(colors=True).error(
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"<r><bg #f8bbd0>WebSocket connection closed by peer. "
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"Try to reconnect...</bg #f8bbd0></r>")
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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f"<r><bg #f8bbd0>Error while connecting to {url}. "
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"Try to reconnect...</bg #f8bbd0></r>")
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finally:
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if bot:
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self._bot_disconnect(bot)
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bot = None
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await asyncio.sleep(setup.reconnect_interval)
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except asyncio.CancelledError:
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pass
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Unexpected exception occurred "
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"while websocket loop</bg #f8bbd0></r>")
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@dataclass
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class WebSocket(BaseWebSocket):
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websocket: Union[FastAPIWebSocket,
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WebSocketClientProtocol] = None # type: ignore
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@property
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@overrides(BaseWebSocket)
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def closed(self) -> bool:
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if isinstance(self.websocket, FastAPIWebSocket):
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return (
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self.websocket.client_state == WebSocketState.DISCONNECTED or
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self.websocket.application_state == WebSocketState.DISCONNECTED)
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else:
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return self.websocket.closed
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@overrides(BaseWebSocket)
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async def accept(self):
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if isinstance(self.websocket, FastAPIWebSocket):
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await self.websocket.accept()
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else:
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raise NotImplementedError
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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)
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@overrides(BaseWebSocket)
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async def receive(self) -> str:
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if isinstance(self.websocket, FastAPIWebSocket):
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return await self.websocket.receive_text()
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else:
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msg = await self.websocket.recv()
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return msg.decode("utf-8") if isinstance(msg, bytes) else msg
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@overrides(BaseWebSocket)
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async def receive_bytes(self) -> bytes:
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if isinstance(self.websocket, FastAPIWebSocket):
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return await self.websocket.receive_bytes()
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else:
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msg = await self.websocket.recv()
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return msg.encode("utf-8") if isinstance(msg, str) else msg
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@overrides(BaseWebSocket)
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async def send(self, data: str) -> None:
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if isinstance(self.websocket, FastAPIWebSocket):
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await self.websocket.send({"type": "websocket.send", "text": data})
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else:
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await self.websocket.send(data)
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@overrides(BaseWebSocket)
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async def send_bytes(self, data: bytes) -> None:
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if isinstance(self.websocket, FastAPIWebSocket):
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await self.websocket.send({"type": "websocket.send", "bytes": data})
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else:
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await self.websocket.send(data)
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