Question

我目前正在学习CS50的Web开发课程（刚刚结束JavaScript讲座），并且偶然发现了使用SocketIO的Web套接字问题。我运行了以下链接提供的源代码：Source code。我运行了程序：“ vote1”。

当我运行程序时（设置环境变量并运行flask run之后），需要花一些时间加载并在终端中显示以下内容：

127.0.0.1 - - [10/Jun/2019 16:57:23] "GET /socket.io/?EIO=3&transport=polling&t=1560178643212-45 HTTP/1.1" 200 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "GET /socket.io/?EIO=3&transport=polling&t=1560178643232-46&sid=d8c5c5cf1dcc4cd8b06d4c629c980539 HTTP/1.1" 400 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "POST /socket.io/?EIO=3&transport=polling&t=1560178668231-47&sid=d8c5c5cf1dcc4cd8b06d4c629c980539 HTTP/1.1" 400 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "GET /static/index.js HTTP/1.1" 200 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [10/Jun/2019 16:58:24] "GET /socket.io/?EIO=3&transport=polling&t=1560178704847-0 HTTP/1.1" 200 -

点击“是”按钮后，“是”票本来会增加，但不会增加，而是在大约30秒后在终端上显示：

127.0.0.1 - - [10/Jun/2019 17:02:01] "GET /socket.io/?EIO=3&transport=polling&t=1560178861393-1&sid=852b4c8df564432292c44c878643cf5d HTTP/1.1" 200 -
127.0.0.1 - - [10/Jun/2019 17:02:01] "POST /socket.io/?EIO=3&transport=polling&t=1560178869697-2&sid=852b4c8df564432292c44c878643cf5d HTTP/1.1" 400 -
127.0.0.1 - - [10/Jun/2019 17:02:01] "GET /socket.io/?EIO=3&transport=polling&t=1560178921417-3&sid=852b4c8df564432292c44c878643cf5d HTTP/1.1" 400 -
127.0.0.1 - - [10/Jun/2019 17:02:01] "POST /socket.io/?EIO=3&transport=polling&t=1560178921418-4&sid=852b4c8df564432292c44c878643cf5d HTTP/1.1" 400 -
127.0.0.1 - - [10/Jun/2019 17:02:02] "GET /socket.io/?EIO=3&transport=polling&t=1560178922496-5 HTTP/1.1" 200 -

我正在Linux Mint上使用Firefox（以防出现问题）。

关于如何解决此错误以便程序正常运行的任何想法？

编辑：我发现您应该包括：

if __name__ == 'main':
    socketio.run(app)

我添加了此内容，但仍然存在相同的问题。

该帖子获得了一些否决权，我认为这是因为我发布了指向源代码的链接。对于那些想查看application.py文件和JavaScript文件的人，我添加了以下代码：

Application.py：

import os
import requests

from flask import Flask, jsonify, render_template, request
from flask_socketio import SocketIO, emit

app = Flask(__name__)
app.config["SECRET_KEY"] = os.getenv("SECRET_KEY")
socketio = SocketIO(app)

votes = {"yes": 0, "no": 0, "maybe": 0}


@app.route("/")
def index():
    return render_template("index.html", votes=votes)


@socketio.on("submit vote")
def vote(data):
    selection = data["selection"]
    votes[selection] += 1
    emit("vote totals", votes, broadcast=True)

Index.js：

document.addEventListener('DOMContentLoaded', () => {

    // Connect to websocket
    var socket = io.connect(location.protocol + '//' + document.domain + ':' + location.port);

    // When connected, configure buttons
    socket.on('connect', () => {

        // Each button should emit a "submit vote" event
        document.querySelectorAll('button').forEach(button => {
            button.onclick = () => {
                const selection = button.dataset.vote;
                socket.emit('submit vote', {'selection': selection});
            };
        });
    });

    // When a new vote is announced, add to the unordered list
    socket.on('vote totals', data => {
        document.querySelector('#yes').innerHTML = data.yes;
        document.querySelector('#no').innerHTML = data.no;
        document.querySelector('#maybe').innerHTML = data.maybe;
    });
});

希望这会有所帮助：）

Answer 1

我已经解决了这个问题。在Flask-SocketIO的文档中，它指出您应该使用：

if __name__ == '__main__':
    socketio.run(app)

与其使用flask run来运行应用程序，而不必像运行普通的Python程序一样运行它。

SocketIO问题

1 个答案: