How might one go about accessing a session value inside of a socket.io instance?

Question is in the title, just wondering if there is a function like session.getSesh(seshid).userid or something

[albertogasparin]

Well, I’ve made it work in this way:

import http from 'http';
import socketIO from 'socket.io';
import koa from 'koa';
import session from 'koa-session';

// your koa setup
const app = new koa();
app.keys = ['my-secret'];
app.use(session({}, app));

// socket.io binding
app.server = http.createServer(app.callback());
app.io = socketIO(app.server);

// socket.io middleware to set socket.session
app.io.use(function (socket, next) {
  let error = null;
  try {
    // we manually create a koa context, so we can use it to retrieve the session
    let context = app.createContext(socket.request, socket.response);
    socket.session = context.session;
  } catch (err) {
    error = err;
  }
  return next(error);
});

In this implementation, the main difference with cxt.session is that socket.session is “static”: it is not a getter but it is just the returned value (something to not worry about with cookies).

[lastHelp]

@thanhlq I’ve found a way to fix this. here is some code:

app.io.use(async function (socket, next) { // making io middleware async, not sure it's good idea
// ... 
try {
// ...
 const ctx = app.createContext(socket.request, new http.OutgoingMessage())
// calling initFromExternal to fetch session data from external store, if you are using other than koa-session module you have to find how to do this. 
 await ctx.session._sessCtx.initFromExternal()
 // now ctx.session is full of data
}
// ...
})