Question

我正在使用node.js，ejs，express，mysql和socket.io。我的服务器看起来像这样（index.js）：

onRemove = (event, data) => {
    console.log("onRemove event");
}

render() {
    return (
        <Label color='teal' content='Label content' removeIcon='delete' 
           onRemove={this.onRemove} />
    );
}

客户：

h1 {
    margin-top: calc((100%)/2);
    transition: color 0.5s linear, transform 0.5s ease-in-out;
}

基本上，当我重新启动服务器并尝试运行时，例如：module.exports = function(io) { var express = require('express'); var router = express.Router(); var mysql = require('mysql'); var pool = mysql.createPool({ connectionLimit: 10, host: 'localhost', user: 'root', password: '', database: 'chat' }); router.get('/chat/:channel_name', (req, res, next) => { var channel_name = req.params.channel_name; // get the countries from the database so we make sure the users are connecting to the correct channel to chat, else redirect to /chat pool.getConnection((err, connection) => { if(err) return console.log(err); connection.query('SELECT * FROM channel WHERE channel_name = ?', channel_name, (err, rows) => { if(err) return console.log(err) if(!rows.length){ return res.redirect('/chat') } res.render('channel', {channel_name: rows[0].channel_name}) var channel = io.of(`/chat/${rows[0].channel_name}`); channel.on('connection', function(socket){ socket.join(rows[0].channel_name) channel.to(rows[0].channel_name).emit('say hi', 'Hi from ' + rows[0].channel_name + '!'); }); }); }); }); router.get('/chat', function(req, res, next) { res.render('chat'); }); return router; }，它显示在html页面上：<!DOCTYPE html> <html> <head> <title><%= channel_name %></title> </head> <body> <div id="message"></div> </body> </html> <script src="/js/lib/jquery/jquery-3.2.1.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.1.1/socket.io.js"></script> <script> var socket = io(`/chat/<%= channel_name %>`); socket.on('say hi', function(data){ $('#message').append(`<div>${data}</div>`) }) </script>
但是，在重新启动页面10次后（第11次），浏览器保持加载状态，并且在命令提示符下显示/chat/uk，为什么会发生这种情况？
另外，这是使用名称空间的正确方法吗？我想创建用户将连接的多个通道（名称空间），然后私下（房间）一对一聊天

Answer 1

这是当您不编写响应并允许应用挂起时系统的反应。

GET /chat/uk - - ms - -

“--”为空白，表示没有响应代码，时间或大小。翻译后，您会看到响应的未知属性。

您的代码没有响应，也没有生成错误代码，并且从不进入以下行：

    if(err) return console.log(err) //happens twice 


    return res.redirect('/chat')


    res.render('channel', {channel_name: rows[0].channel_name})

问题可能在这条线上：

    connection.query('SELECT * FROM channel WHERE channel_name = ?', channel_name, (err, rows) => {

您永远不会关闭与数据库的先前连接。尝试添加

    connection.release();

在代码中的某些地方

，因为与mysql数据库的可用连接可能已用完。要检查，您可以在这里查看方向 How to get number of unused/used connection in nodejs mysql connection pool ? 或使用这些命令

pool.config.connectionLimit     // passed in max size of the pool
pool._freeConnections.length    // number of free connections awaiting use
pool._allConnections.length     // number of connections currently created, including ones in use
pool._acquiringConnections.length // number of connections in the process of being acquired

让我知道这是否可行，或者是否有后续问题。

十个连接后Socket.io命名空间停止工作

1 个答案: