flask app socketIO脚本期间的服务器等待

Question

我正在尝试在flask web socket应用程序的服务器端脚本中创建时间延迟

最终，我希望服务器能够同时处理许多请求，并且能够以固定的时间间隔向客户机发回两个数据包

当我在两个flask_socketio.emit语句之间使用time.sleep(x)时，客户机在睡眠完成后一起接收套接字发出事件

如何在python flask应用程序中实现Emit X; wait Y seconds; emit Z

服务器端代码摘录：

from flask import Flask, request
from flask_socketio import SocketIO, join_room, emit
app = Flask(__name__)
socketio = SocketIO(app)
@socketio.on('ping')

def ping(appState):
    """send 2 pings, between a time interval"""
    room = appState["sessionID"]
    emit('serverPingResponse', {'room': room, 'msg':"Ping Received by Server"})
    time.sleep(5)
    emit('serverPingResponse', {'room': room, 'msg':"2nd time-delayed ping"})
    return

客户端代码摘录：

var socket = io.connect('http://' + document.domain + ':' + location.port);
socket.on("serverPingResponse", function(msg){
      // listen to server ping and print the message to console
      let d = new Date();
      console.log("ping received at "+d.toLocaleTimeString(), msg)
    });

控制台输出

pinging server...
ping received at 10:43:14 AM 
Object { room: "wvdhj01f3p", msg: "Ping Received by Server" }
ping received at 10:43:14 AM 
Object { room: "wvdhj01f3p", msg: "2nd time-delayed ping" }

期望的输出是第一个ping在10:43:09接收，第二个ping在10:43:14接收

Answer 1

您正在使用time.sleep()函数，我猜这会阻塞您的服务器。尝试改用socketio.sleep()，这将实现与您正在使用的异步框架（eventlet、gevent）兼容的协作睡眠