How to get event details in middleware for socket.io

问题

I am trying to log the event name and parameter for each event on my Node server. For this purpose I used

io.use(function(socket, next){
  // how to get event name out of socket.
});

Now, I got stuck while trying to get event name and arguments. To me, it looks like common demand from API dev, so I am pretty sure there must be some way to the library to get that, I have tried to read the docs and source but I am not able to get the stuff.

回答1:

The socket events needs to be handled properly,in any case if an event is not handled there will be no response.

var io = require('socket.io')(server);
var sessionMiddleWare=(session({secret: 'secret key', resave: true, saveUninitialized: true,cookie: { path: '/', httpOnly: true, maxAge: 300000 },rolling: true}));

app.use(sessionMiddleWare)

io.use(function(socket, next) {
  sessionMiddleWare(socket.request, socket.request.res, next);
});

io.on('connection', function(socket) {  // On Socket connection.
   // inside this you can use different events

   //event name and parameters can be found in socket variable.

   console.log(socket.id) // prints the id sent from the client.
   console.log(socket.data) // prints the data sent from the client.

   // example event

   socket.on('subscribe', function(room) {  // Event sample.
        console.log('joining room', room);
        socket.room=room;
        socket.join(room);
    });
})

Hope this helps.

来源：https://stackoverflow.com/questions/32882891/how-to-get-event-details-in-middleware-for-socket-io