fastapi

tutorial003.py
83 строки · 2.5 Кб
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from typing import List
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from fastapi import FastAPI, WebSocket, WebSocketDisconnect
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from fastapi.responses import HTMLResponse
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app = FastAPI()
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html = """
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>Chat</title>
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    </head>
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    <body>
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        <h1>WebSocket Chat</h1>
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        <h2>Your ID: <span id="ws-id"></span></h2>
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        <form action="" onsubmit="sendMessage(event)">
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            <input type="text" id="messageText" autocomplete="off"/>
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            <button>Send</button>
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        </form>
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        <ul id='messages'>
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        </ul>
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        <script>
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            var client_id = Date.now()
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            document.querySelector("#ws-id").textContent = client_id;
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            var ws = new WebSocket(`ws://localhost:8000/ws/${client_id}`);
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            ws.onmessage = function(event) {
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                var messages = document.getElementById('messages')
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                var message = document.createElement('li')
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                var content = document.createTextNode(event.data)
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                message.appendChild(content)
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                messages.appendChild(message)
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            };
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            function sendMessage(event) {
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                var input = document.getElementById("messageText")
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                ws.send(input.value)
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                input.value = ''
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                event.preventDefault()
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            }
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        </script>
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    </body>
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</html>
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"""
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class ConnectionManager:
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    def __init__(self):
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        self.active_connections: List[WebSocket] = []
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    async def connect(self, websocket: WebSocket):
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        await websocket.accept()
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        self.active_connections.append(websocket)
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    def disconnect(self, websocket: WebSocket):
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        self.active_connections.remove(websocket)
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    async def send_personal_message(self, message: str, websocket: WebSocket):
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        await websocket.send_text(message)
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    async def broadcast(self, message: str):
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        for connection in self.active_connections:
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            await connection.send_text(message)
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manager = ConnectionManager()
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@app.get("/")
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async def get():
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    return HTMLResponse(html)
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@app.websocket("/ws/{client_id}")
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async def websocket_endpoint(websocket: WebSocket, client_id: int):
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    await manager.connect(websocket)
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    try:
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        while True:
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            data = await websocket.receive_text()
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            await manager.send_personal_message(f"You wrote: {data}", websocket)
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            await manager.broadcast(f"Client #{client_id} says: {data}")
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    except WebSocketDisconnect:
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        manager.disconnect(websocket)
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        await manager.broadcast(f"Client #{client_id} left the chat")
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