feat: 基础 SignalR 服务器支持
This commit is contained in:
MingxuanGame
211
app/router/signalr/hub/hub.py
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211
app/router/signalr/hub/hub.py
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from __future__ import annotations
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import asyncio
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import time
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from typing import Any
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from app.config import settings
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from app.router.signalr.exception import InvokeException
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from app.router.signalr.packet import (
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PacketType,
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ResultKind,
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encode_varint,
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parse_packet,
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)
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from app.router.signalr.store import ResultStore
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from app.router.signalr.utils import get_signature
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from fastapi import WebSocket
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import msgpack
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from pydantic import BaseModel
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from starlette.websockets import WebSocketDisconnect
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class Client:
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def __init__(
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self, connection_id: str, connection_token: str, connection: WebSocket
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) -> None:
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self.connection_id = connection_id
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self.connection_token = connection_token
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self.connection = connection
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self._listen_task: asyncio.Task | None = None
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self._ping_task: asyncio.Task | None = None
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self._store = ResultStore()
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async def send_packet(self, type: PacketType, packet: list[Any]):
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packet.insert(0, type.value)
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payload = msgpack.packb(packet)
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length = encode_varint(len(payload))
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await self.connection.send_bytes(length + payload)
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async def _ping(self):
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while True:
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try:
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await self.send_packet(PacketType.PING, [])
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await asyncio.sleep(settings.SIGNALR_PING_INTERVAL)
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except WebSocketDisconnect:
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break
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except Exception as e:
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print(f"Error in ping task for {self.connection_id}: {e}")
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break
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class Hub:
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def __init__(self) -> None:
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self.clients: dict[str, Client] = {}
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self.waited_clients: dict[str, int] = {}
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self.tasks: set[asyncio.Task] = set()
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def add_waited_client(self, connection_token: str, timestamp: int) -> None:
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self.waited_clients[connection_token] = timestamp
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def add_client(
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self, connection_id: str, connection_token: str, connection: WebSocket
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) -> Client:
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if connection_token in self.clients:
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raise ValueError(
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f"Client with connection token {connection_token} already exists."
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)
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if connection_token in self.waited_clients:
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if (
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self.waited_clients[connection_token]
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< time.time() - settings.SIGNALR_NEGOTIATE_TIMEOUT
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):
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raise TimeoutError(f"Connection {connection_id} has waited too long.")
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del self.waited_clients[connection_token]
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client = Client(connection_id, connection_token, connection)
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self.clients[connection_token] = client
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task = asyncio.create_task(client._ping())
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self.tasks.add(task)
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client._ping_task = task
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return client
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async def remove_client(self, connection_id: str) -> None:
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if client := self.clients.get(connection_id):
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del self.clients[connection_id]
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if client._listen_task:
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client._listen_task.cancel()
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if client._ping_task:
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client._ping_task.cancel()
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await client.connection.close()
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async def send_packet(self, client: Client, type: PacketType, packet: list[Any]):
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await client.send_packet(type, packet)
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async def _listen_client(self, client: Client) -> None:
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jump = False
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while not jump:
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try:
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message = await client.connection.receive_bytes()
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packet_type, packet_data = parse_packet(message)
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task = asyncio.create_task(
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self._handle_packet(client, packet_type, packet_data)
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)
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self.tasks.add(task)
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task.add_done_callback(self.tasks.discard)
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except WebSocketDisconnect as e:
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if e.code == 1005:
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continue
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print(
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f"Client {client.connection_id} disconnected: {e.code}, {e.reason}"
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)
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jump = True
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except Exception as e:
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print(f"Error in client {client.connection_id}: {e}")
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jump = True
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await self.remove_client(client.connection_id)
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async def _handle_packet(
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self, client: Client, type: PacketType, packet: list[Any]
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) -> None:
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match type:
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case PacketType.PING:
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...
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case PacketType.INVOCATION:
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invocation_id: str | None = packet[1] # pyright: ignore[reportRedeclaration]
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target: str = packet[2]
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args: list[Any] | None = packet[3]
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if args is None:
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args = []
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streams: list[str] | None = packet[4] # TODO: stream support
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code = ResultKind.VOID
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result = None
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try:
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result = await self.invoke_method(client, target, args)
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if result is not None:
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code = ResultKind.HAS_VALUE
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except InvokeException as e:
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code = ResultKind.ERROR
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result = e.message
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except Exception as e:
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code = ResultKind.ERROR
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result = str(e)
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packet = [
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{}, # header
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invocation_id,
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code.value,
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]
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if result is not None:
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packet.append(result)
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if invocation_id is not None:
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await client.send_packet(
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PacketType.COMPLETION,
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packet,
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)
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case PacketType.COMPLETION:
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invocation_id: str = packet[1]
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code: ResultKind = ResultKind(packet[2])
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result: Any = packet[3] if len(packet) > 3 else None
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client._store.add_result(invocation_id, code, result)
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async def invoke_method(self, client: Client, method: str, args: list[Any]) -> Any:
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method_ = getattr(self, method, None)
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call_params = []
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if not method_:
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raise InvokeException(f"Method '{method}' not found in hub.")
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signature = get_signature(method_)
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for name, param in signature.parameters.items():
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if name == "self" or param.annotation is Client:
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continue
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if issubclass(param.annotation, BaseModel):
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call_params.append(param.annotation.model_validate(args.pop(0)))
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else:
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call_params.append(args.pop(0))
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return await method_(client, *call_params)
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async def call(self, client: Client, method: str, *args: Any) -> Any:
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invocation_id = client._store.get_invocation_id()
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await client.send_packet(
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PacketType.INVOCATION,
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[
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{}, # header
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invocation_id,
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method,
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list(args),
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None, # streams
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],
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)
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r = await client._store.fetch(invocation_id, None)
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if r[0] == ResultKind.HAS_VALUE:
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return r[1]
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if r[0] == ResultKind.ERROR:
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raise InvokeException(r[1])
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return None
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async def call_noblock(self, client: Client, method: str, *args: Any) -> None:
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await client.send_packet(
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PacketType.INVOCATION,
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[
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{}, # header
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None, # invocation_id
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method,
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list(args),
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None, # streams
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],
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)
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return None
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def __contains__(self, item: str) -> bool:
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return item in self.clients or item in self.waited_clients
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