带有快速生成器的 socket.io

Posted 2023-04-18

【中文标题】带有快速生成器的 socket.io

【英文标题】：socket.io with express generator

【发布时间】：2016-09-04 00:10:02

【问题描述】：

在写这篇文章之前，我尝试了Using socket.io in Express 4 and express-generator's /bin/www的解决方案

终端在/routes/messages.js:12上显示错误

io.on('connection', function(socket)
TypeError: Cannot read property 'on' of undefined

我的文件来了：

/routes/messages.js

var express = require('express');
var controller = require('../controllers/messageController');
var passport = require('passport');
var router = express.Router();


router.get('/', controller.plain);

module.exports = function(io)
  var router = express.Router();

  io.on('connection', function(socket)
    console.log('**********************************************************');
    console.log('mensaje desde socket.io en el archivo de rutas messages.js');
    console.log('**********************************************************');
  );
  return router;
;

/bin/www

#!/usr/bin/env node
/**
 * Module dependencies.
 */

var app = require('../app');
var debug = require('debug')('archiers:server');
var http = require('http');

/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);


/**
 * Create HTTP server.
 */
var server = http.createServer(app);

// socket.io

var io = app.io;
io.attach(server);

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) 
  var port = parseInt(val, 10);

  if (isNaN(port)) 
    // named pipe
    return val;
  

  if (port >= 0) 
    // port number
    return port;
  

  return false;


/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) 
  if (error.syscall !== 'listen') 
    throw error;
  

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) 
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  


/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() 
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);

/app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var morgan = require('morgan');
var mongoose = require('mongoose');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var session = require('express-session');
var socket = require('socket.io');

// var for routes
var index = require('./routes/index');
var users = require('./routes/users');
var projects = require('./routes/projects');
var messages = require('./routes/messages')(io);

var app = express();

// socket.io

var io = socket();
app.io = io;

io.on( "connection", function( socket )

    console.log( "A user connected" );
);

// para devolver estado por consola.
app.use(morgan('combined'));
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
var Account = require('./models/accounts');
passport.use(new LocalStrategy(Account.authenticate()));
passport.serializeUser(Account.serializeUser());
passport.deserializeUser(Account.deserializeUser());

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded( extended: false ));
app.use(cookieParser());
//app.use(multer(dest : "./userFiles/projectImage"))

app.use(express.static(path.join(__dirname, 'public')));

app.use(require('express-session')(
    secret: 'secretpass',
    resave: true,
    saveUninitialized: true,
    cookie:  maxAge : 3600000  //1 Hour
));

app.use(passport.initialize());
app.use(passport.session());
//Rutas express
app.use('/', index);
app.use('/user', users);
app.use('/project', projects);
app.use('/message', messages)

// catch 404 and forward to error handler
app.use(function(req, res, next) 
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
);

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') 
  app.use(function(err, req, res, next) 
    res.status(err.status || 500);
    res.render('error', 
      message: err.message,
      error: err
    );
  );


// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) 
  res.status(err.status || 500);
  res.render('error', 
    message: err.message,
    error: 
  );
);

mongoose.connect('mongodb://localhost/db');



module.exports = app;

【问题讨论】：

Marcos 当您真的想对@Gilad 发表评论时，您不必回答问题。对于您的问题，如果您从 app.js 中删除 io.on('connection') 并且只在 messages.js 中有 io.on('connection') 会发生什么？

我添加了 var messages = require('./routes/messages')(io);正如Gilad所说，这解决了错误，接下来是当有人连接到浏览器上的/message时查看日志消息。

好的！所以试试我说的话，也许你 app.js 中的第二个 io.on('connection') 会覆盖你在 messages.js 文件中设置的第一个。从你的 app.js 中删除代码 io.on('connection', ...)

终端没有发生任何事情：************************************* ***************************** aquí vendran los mensajes del socket.io desde messageController.js ********* ****************************************************** ******* ::ffff:127.0.0.1 - - [09/May/2016:14:15:34 +0000] "GET /message HTTP/1.1" 500 2744 "-" "Mozilla/5.0 (X11 ; Ubuntu; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0" GET /message 500 165.845 ms - 2744

【参考方案1】：

在 app.js 你有这个代码：

var messages = require('./routes/messages')(io);

var app = express();

// socket.io

var io = socket();
app.io = io;

您应该在将 io 变量传递给消息导出函数之前对其进行初始化 - 如下所示：

var app = express();

// socket.io

var io = socket();
app.io = io;

var messages = require('./routes/messages')(io);