84 lines
2.5 KiB
Python
84 lines
2.5 KiB
Python
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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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