express session 和 socketio session關聯

express session

http是沒有狀態的協議， 需要web框架自己實現會話和會話管理工作。

express框架有session插件可以使用。

見如下介紹：

https://www.tutorialspoint.com/expressjs/expressjs_sessions.htm

We will need the Express-session, so install it using the following code.

npm install --save express-session

We will put the session and cookie-parser middleware in place. In this example, we will use the default store for storing sessions, i.e., MemoryStore. Never use this in production environments. The session middleware handles all things for us, i.e., creating the session, setting the session cookie and creating the session object in req object.

    使用 session 和 cookie-parser中間件可以實現， 在req對象上回關聯session對象。

var express = require('express');
var cookieParser = require('cookie-parser');
var session = require('express-session');

var app = express();

app.use(cookieParser());
app.use(session({secret: "Shh, its a secret!"}));

app.get('/', function(req, res){
   if(req.session.page_views){
      req.session.page_views++;
      res.send("You visited this page " + req.session.page_views + " times");
   } else {
      req.session.page_views = 1;
      res.send("Welcome to this page for the first time!");
   }
});
app.listen(3000);

 

socketio connection session

socketio對於現在實時數據推送非常友好， 在很多網站上被使用。

如何在socketio connection上關聯上對應的session， 此session為 express session創建， express創建后， 在處理的handler中， 入參數 req.session 可以獲取會話。

在socketio連接上如何獲取會話呢？

 

解決方案見下面鏈接：

https://github.com/wcamarao/session.socket.io/blob/master/example/server.js

ar http = require('http')
  , path = require('path')
  , connect = require('connect')
  , express = require('express')
  , app = express();

var cookieParser = express.cookieParser('your secret sauce')
  , sessionStore = new connect.middleware.session.MemoryStore();

app.configure(function () {
  app.set('views', path.resolve('views'));
  app.set('view engine', 'jade');

  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(cookieParser);
  app.use(express.session({ secret: 'your secret sauce', store: sessionStore }));
  app.use(app.router);
});

var server = http.createServer(app)
  , io = require('socket.io').listen(server);

var SessionSockets = require('session.socket.io')
  , sessionSockets = new SessionSockets(io, sessionStore, cookieParser);

app.get('/', function(req, res) {
  req.session.foo = req.session.foo || 'bar';
  res.render('index');
});

sessionSockets.on('connection', function (err, socket, session) {
  socket.emit('session', session);

  socket.on('foo', function(value) {
    session.foo = value;
    session.save();
    socket.emit('session', session);
  });
});

server.listen(3000);

 

 

express 4之上版本 express session天生支持

https://blog.csdn.net/u012251421/article/details/76207034

express 4.x可以直接把express-session中間件當成socket.io處理，所以可以簡單像下面這樣，就可以共享express的session了

1. sio.use(function(socket, next) {
2. sessionMiddleware( socket.request, socket.request.res, next);
3. });

example:

1. var Server = require("http").Server;
2. var session = require("express-session");
3.  
4. var app = express();
5. var server = Server(app);
6. var sio = require("socket.io")(server);
7.  
8. var sessionMiddleware = session({
9. secret: "keyboard cat",
10. resave: false,
11. saveUninitialized: true
12. });
13.  
14. sio.use(function(socket, next) {
15. sessionMiddleware( socket.request, socket.request.res, next);
16. });
17.  
18. app.use(sessionMiddleware);
19.  
20. app.get("/", function(req, res){
21. req.session.username = 'jim';
22. });
23.  
24. sio.sockets.on("connection", function(socket) {
25. console.log(socket.request.session.username); // 'jim'
26. });
27.  
28. server.listen(80);
29.  

 

express-socket.io-session

https://www.npmjs.com/package/express-socket.io-session

After every socket connection, you'll have socket.handshake.session. That is the same session object req.session you get in your route middleware when your app uses express-session.

 

Modifying session data inside socket.io event handlers

When inside express, you normally get to modify your session variables trusting that express-session saves them for you.

Invoke this module with an option of autoSave:true in order for achieveing the same behaviour.

io.use(sharedsession(session, {

    autoSave:true

}));

 

var app = require('express')(),
  server  = require("http").createServer(app),
  io = require("socket.io")(server),
  session = require("express-session")({
    secret: "my-secret",
    resave: true,
    saveUninitialized: true
  }),
  sharedsession = require("express-socket.io-session");
 
 
// Attach session
app.use(session);
 
// Share session with io sockets
 
io.use(sharedsession(session));
 
io.on("connection", function(socket) {
    // Accept a login event with user's data
    socket.on("login", function(userdata) {
        socket.handshake.session.userdata = userdata;
        socket.handshake.session.save();
    });
    socket.on("logout", function(userdata) {
        if (socket.handshake.session.userdata) {
            delete socket.handshake.session.userdata;
            socket.handshake.session.save();
        }
    });        
});
 
server.listen(3000);

 

 

express登錄例子：

https://cnodejs.org/topic/516517a56d38277306c614da