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I have a simple module like this:

module.exports = function (io, c) {

    c.on('connection', function (socket) {

      var customVariable = 0;

      socket.on('test', function (data) {
            customVariable = 5;
      });
    });

When i set customVariable to for example 5 it becomes 5 for every connected user.

I want to store some variables for each individual user. How can i achieve this? I use Node.js 6 with socket.io lib (latest). Is it wise to use this method OR should I make an array/collection and assign my variables to my socket id like;

var users = [
  socketId: {
     //my data goes here...
  }
];
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7
  • You should consider a database, unless you want that info to disappear anytime the process shuts down. Commented Dec 5, 2016 at 13:12
  • thanks for the hint. of course I already have it. But for example i have few variables to assign to only current socket session. When socket session get lost or shutdown, variable should disappear. For example when user connected to server, i want to store userId (against database) inside of my js file so i can easily grab user id without querying database each time. Commented Dec 5, 2016 at 13:13
  • An object with the socketIds as keys sounds like a good way if you don't want to store them in a database. Commented Dec 5, 2016 at 13:35
  • @Syc, yes i probably go with it. I think keeping it inside of an array within memory is faster than reading from database. Imagine that I fetch select user_id from sessions where socket_id = ? everytime a request made to my socket.io server instead of just saying arr[socketId].user_id. Am I thinking still wrong? Should I even query against db each time? Commented Dec 5, 2016 at 13:53
  • Refer: stackoverflow.com/questions/38762017/… Commented Dec 5, 2016 at 14:14
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