不知道什么時候FastApi官網(wǎng)更新了websockets頁面
1.打開以下網(wǎng)頁直接拖到最后復(fù)制官網(wǎng)代碼
https://fastapi.tiangolo.com/advanced/websockets/
復(fù)制
回看一下FastApi
我現(xiàn)在復(fù)制并創(chuàng)建了一個名為main.py的文件，內(nèi)容如下
順便加了些備注
# 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>
// 生成id
var client_id = Date.now()
document.querySelector("#ws-id").textContent = client_id;
var ws = new WebSocket(`ws://localhost:8000/ws/${client_id}`);
// 頁面顯示發(fā)送內(nèi)容
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)
};
// 點擊onsubmit調(diào)用函數(shù)sendMessage
function sendMessage(event) {
var input = document.getElementById("messageText")
ws.send(input.value)
input.value = ''
event.preventDefault()
}
</script>
</body>
</html>
"""
class ConnectionManager:
def __init__(self):
# 定義類屬性 有效連接 儲存WebSocket對象
self.active_connections: List[WebSocket] = []
# 創(chuàng)建連接
async def connect(self, websocket: WebSocket):
await websocket.accept()
self.active_connections.append(websocket)
# 刪除websocket連接
def disconnect(self, websocket: WebSocket):
self.active_connections.remove(websocket)
# 發(fā)送個人消息
async def send_personal_message(self, message: str, websocket: WebSocket):
await websocket.send_text(message)
# 廣播
async def broadcast(self, message: str):
for connection in self.active_connections:
await connection.send_text(message)
# 創(chuàng)建一個名為manager的對象
manager = ConnectionManager()
# 頁面請求
@app.get("/")
async def get():
# 返回http頁面
return HTMLResponse(html)
# websocket請求
@app.websocket("/ws/{client_id}")
async def websocket_endpoint(websocket: WebSocket, client_id: int):
# 使用connect方法
await manager.connect(websocket)
try:
while True:
# 連接關(guān)閉時await websocket.receive_text()將引發(fā)WebSocketDisconnect異常
data = await websocket.receive_text()
# 調(diào)用發(fā)送個人信息send_personal_message方法
await manager.send_personal_message(f"You wrote: {data}", websocket)
# 調(diào)用廣播broadcast方法
await manager.broadcast(f"Client #{client_id} says: {data}")
except WebSocketDisconnect:
manager.disconnect(websocket)
await manager.broadcast(f"Client #{client_id} left the chat")
啟動
直接啟動服務(wù)
uvicorn main:app --reload
回看
官網(wǎng)的教程也是定義了一個類
class ConnectionManager:
創(chuàng)建了一個類屬性來存儲websocket對象，比我之前寫的好多了（用了一個字典來存）當(dāng)時是完全不知道websocket對象的操作方法，一點也不優(yōu)雅
self.active_connections: List[WebSocket] = []
類方法有以下4個
連接
async def connect(self, websocket: WebSocket):
發(fā)送個人消息，僅自己可見
async def send_personal_message(self, message: str, websocket: WebSocket):
廣播
async def broadcast(self, message: str):
刪除socket連接（這里為什么不用 async）
def disconnect(self, websocket: WebSocket):
以下內(nèi)容為前端展示
==================================================================
用戶標(biāo)識用前端來展示，很方便也不用考慮那么多
var client_id = Date.now()
document.querySelector("#ws-id").textContent = client_id;
發(fā)送請求的函數(shù) ”vent對象（沒搞懂）”
function sendMessage(event)
看了官網(wǎng)的再看自己的，感覺之前好多地方之前都沒考慮到
還是官網(wǎng)的代碼好用，所以我為什么要自己敲
