FastAPI WebSocket 简单演示

WebSocket 服务

使用Python FastAPI框架官网demo，官网地址：https://fastapi.tiangolo.com/zh/advanced/websockets/

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @time: 2021/12/9 6:30 下午
import uvicorn
from typing import List

from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from fastapi.responses import HTMLResponse

app = FastAPI()

html = """
<!DOCTYPE html>
<html>
    <head>
        <title>Chat</title>
    </head>
    <body>
        <h1>WebSocket Chat</h1>
        <h2>Your ID: <span id="ws-id"></span></h2>
        <form action="" onsubmit="sendMessage(event)">
            <input type="text" id="messageText" autocomplete="off"/>
            <button>Send</button>
        </form>
        <ul id='messages'>
        </ul>
        <script>
            var client_id = Date.now()
            document.querySelector("#ws-id").textContent = client_id;
            var ws = new WebSocket(`ws://localhost:8010/ws/${client_id}`);
            ws.onmessage = function(event) {
                var messages = document.getElementById('messages')
                var message = document.createElement('li')
                var content = document.createTextNode(event.data)
                message.appendChild(content)
                messages.appendChild(message)
            };
            function sendMessage(event) {
                var input = document.getElementById("messageText")
                ws.send(input.value)
                input.value = ''
                event.preventDefault()
            }
        </script>
    </body>
</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)

    @classmethod
    async def send_personal_message(cls, message: str, websocket: WebSocket):
        await websocket.send_text(message)

    async def broadcast(self, message: str, websocket: WebSocket = None):
        for connection in self.active_connections:
            if connection != websocket:
                await connection.send_text(message)


manager = ConnectionManager()


@app.get("/")
async def get():
    return HTMLResponse(html)


@app.websocket("/ws/{client_id}")
async def websocket_endpoint(websocket: WebSocket, client_id: int):
    await manager.connect(websocket)
    try:
        while True:
            data = await websocket.receive_text()
            await manager.send_personal_message(f"你说了: {data}", websocket)
            await manager.broadcast(f"用户:{client_id} 说: {data}", websocket)

    except WebSocketDisconnect:
        manager.disconnect(websocket)
        await manager.broadcast(f"用户-{client_id}-离开")


if __name__ == '__main__':
    uvicorn.run('main:app', debug=True, host='0.0.0.0', port=8010)

 

posted @ 2021-12-09 19:16  LiShiChao  阅读(569)  评论(0)  编辑  收藏  举报