带有 express-generator 的 Nodejs 应用程序，并尝试添加 primus websocket

Posted 2023-04-18

【中文标题】带有 express-generator 的 Nodejs 应用程序，并尝试添加 primus websocket

【英文标题】：Nodejs application with express-generator, and trying to add primus websocket

【发布时间】：2017-10-03 01:16:38

【问题描述】：

我们目前正在尝试构建一个与 express-generator 一起使用的 nodejs 应用程序。我目前正在尝试将 Primus websocket 添加到我的应用程序中。问题是如果我不将 app.listen(port) 添加到我的 app.js 文件中，我的应用程序将不会显示在 localhost:3000 上，即使它包含在 bin/www 文件中。如果我添加 app.listen(port)，我的应用程序似乎无法找到 primus 库，尽管我将它安装到我的依赖项中。不知道我的app找不到primus库的问题是不是和我有没有添加app.listen(port)有关。

我的 app.js 文件 [

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var flash = require('connect-flash');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var passport = require('passport');
var Strategy = require('passport-facebook').Strategy;
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/facebookusers');
var http = require("http");
var Primus = require("primus");

var options = 
    transformer: "engine.io"


var facebook = require('./routes/facebook');
var users = require('./routes/users');
var profile = require('./routes/profile');
var login = require('./routes/login');
var admin = require('./routes/admin');
var vote_now = require('./routes/vote_now');
var vote_result = require('./routes/vote_result');
var groups = require('./routes/groups');
var endvoting = require('./routes/endvoting');
var roles = require('./routes/roles');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// 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(express.static(path.join(__dirname, 'public')));
app.use(require('morgan')('combined'));
app.use(session( secret: 'marioWim' ));
app.use(passport.initialize());
app.use(passport.session());
app.use(flash());

app.use('/users', users);
app.use('/profile/', profile);
app.use('/login', login);
app.use('/admin/', admin);
app.use('/vote_now', vote_now);
app.use('/vote_result', vote_result);
app.use('/auth/facebook', facebook);
app.use('/groups', groups);
app.use('/endvoting', endvoting);
app.use('/roles',roles);

// 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 handler
app.use(function(err, req, res, next) 
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : ;
  // render the error page
  res.status(err.status || 500);
  res.render('error');
);

app.listen(3000);

module.exports = app;

我的 package.json 文件

  "name": "demo-or-die",
  "version": "0.0.0",
  "private": true,
  "scripts": 
    "start": "node ./bin/www"
  ,
  "dependencies": 
    "body-parser": "^1.17.1",
    "connect-ensure-login": "^0.1.1",
    "connect-flash": "^0.1.1",
    "cookie-parser": "^1.4.3",
    "debug": "~2.6.3",
    "engine.io": "^3.1.0",
    "express": "~4.15.2",
    "express-session": "^1.15.2",
    "flash": "^1.1.0",
    "jade": "~1.11.0",
    "mongoose": "^4.9.6",
    "morgan": "^1.8.1",
    "named-routes": "^2.0.6",
    "passport": "^0.3.2",
    "passport-facebook": "^2.1.1",
    "primus": "^7.0.1",
    "prompt": "^1.0.0",
    "pug": "^2.0.0-beta.12",
    "serve-favicon": "~2.4.2"
  ,
  "devDependencies": 
    "gulp": "^3.9.1",
    "gulp-changed": "^3.0.0",
    "gulp-imagemin": "^3.2.0",
    "gulp-nodemon": "^2.2.1",
    "gulp-sass": "^3.1.0"
  

我的垃圾桶/www

#!/usr/bin/env node

/**
 * Module dependencies.
 */

var app = require('../app');
var debug = require('debug')('demo-or-die: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);


/**
 * 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);

【参考方案1】：

试试这段代码。显示 Primus 接受 WS 连接，而 Express 应用程序字段请求特定路由。我们的服务器是 Express 和 Primus 通用的。

var Express = require('express');
var app = Express();

var server = require('http').createServer(app);

var Primus = require('primus');
var primus = new Primus(server, transformer: 'sockjs', pathname:'ws');

primus.on('initialised', function() 
    console.log('Primus Initialized!');
);

primus.on('connection', function connection(spark)   
  console.log("spark connected");
  spark.write("Hello Client, I'm the Server");

  spark.on('data', function(data) 
    console.log('data:', data);
    spark.write('received.');
  );
);

app.get('/', function(req, res) 
    res.send('home');
);

app.get('/test', function(req, res) 
    res.send('test');
);

server.listen(host: '0.0.0.0', port: 8081);

wscat 节点包在测试时很有用：

客户

$ curl 127.0.0.1:8081/test
test    
$ wscat -c 127.0.0.1:8081/ws/websocket

connected (press CTRL+C to quit)

< "Hello Client, I'm the Server"
> "foo": "bar"

< "received."

服务器

$ node test.js 
Primus Initialized!
spark connected
data:  foo: 'bar' 

【参考方案2】：

我自己解决了这个问题，这是一个愚蠢的问题。 解决方案是命令“nodemon bin/www”而不是“nodemon app.js”