#!usr/bin/env python
"""
"""
import uvicorn
from fastapi import FastAPI, WebSocket
from fastapi.responses import HTMLResponse
app = FastAPI()
html = """
@app.get("/")
async def get():
return HTMLResponse(html)
async def get_cookie_or_token(
websocket: WebSocket,
session: Optional[str] = Cookie(None),
token: Optional[str] = Query(None)
):
# 模拟:如果 session 和 token 都为空,则关闭 websocket
if session or token:
return session or token
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
@app.websocket("/items/{item_id}/ws")
async def websocket_depends(
websocket: WebSocket,
item_id: str,
q: Optional[str] = None,
# 依赖项
cookie_or_token: str = Depends(get_cookie_or_token)
):
# 1、创建 websocket 连接
await websocket.accept()
while True:
# 2、接收客户端发送的内容
data = await websocket.receive\_text()
# 3、服务端发送内容
await websocket.send\_text(f"cookie or token value is:{cookie\_or\_token}")
if q:
# 4、如果有传查询参数 q,则再发一条
await websocket.send\_text(f"query param value is:{q}")
# 5、最后再发一条信息
await websocket.send\_text(f"Message text was: {data}, for item ID: {item\_id}")
if __name__ == '__main__':
uvicorn.run(app="46_websocket:app", reload=True, host="127.0.0.1", port=8080)
不带查询参数 q
带查询参数 q
await websocket.receive_text() 将引发 WebSocketDisconnect 异常,这不是期望看到的结果
from typing import List
import uvicorn
from fastapi import FastAPI, WebSocket, WebSocketDisconnect, status
from fastapi.responses import HTMLResponse
app = FastAPI()
html = """
@app.get("/")
async def get():
return HTMLResponse(html)
class ConnectionManager:
def __init__(self):
self.active_connections: List[WebSocket] = []
async def connect(self, websocket: WebSocket):
await websocket.accept()
self.active\_connections.append(websocket)
def disconnect(self, websocket: WebSocket):
self.active\_connections.remove(websocket)
async def send\_personal\_message(self, message: str, websocket: WebSocket):
await websocket.send\_text(message)
async def broadcast(self, message: str):
for connection in self.active\_connections:
await connection.send\_text(message)
manager = ConnectionManager()
@app.websocket("/ws/{client_id}")
async def websocket_endpoint(client_id: str, websocket: WebSocket):
# 1、客户端、服务端建立 ws 连接
await manager.connect(websocket)
# 2、广播某个客户端进入聊天室
await manager.broadcast(f"{client_id} 进入了聊天室")
try:
while True:
# 3、服务端接收客户端发送的内容
data = await websocket.receive_text()
# 4、广播某个客户端发送的消息
await manager.broadcast(f"{client_id} 发送消息:{data}")
# 5、服务端回复客户端
await manager.send_personal_message(f"服务端回复{client_id}:你发送的信息是:{data}", websocket)
except WebSocketDisconnect:
# 6、若有客户端断开连接,广播某个客户端离开了
manager.disconnect(websocket)
await manager.broadcast(f"{client_id} 离开了聊天室")
if __name__ == '__main__':
uvicorn.run(app="48_websocket_handler:app", reload=True, host="127.0.0.1", port=8080)
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