Retrieving number of connected sockets using `fetchSockets` without getting all socket information

[MatanYemini]

Retrieving number of connected sockets using `fetchSockets` without getting all socket information

[cody-evaluate]

I second this. I do not care if socket count is not always 1 to 1 with user count. I need a way to count sockets without pulling all data over the wire.

[darrachequesne]

Hi! Yes, as you have noted the fetchSockets() method transfers a lot of data.

You should use the serverSideEmit() method instead:

io.serverSideEmit("hello", "world");

// And on the receiving side:
io.on("hello", (arg1) => {
  console.log(arg1); // prints "world"
});

Reference: https://socket.io/docs/v4/server-instance/#serversideemit

[MatanYemini]

Yeah. I have used that for now.

@darrachequesne What do you think about adding the "count" as a separate function? You don't think it would be usable?

I have also an example of a patch with a new function.

[darrachequesne]

What do you think about adding the "count" as a separate function?

I'm not sure that's a good idea, because in most cases I think one wants to count the number of users, not the number of sockets (since a single user can have multiple connections). What do you think?

[MatanYemini]

@darrachequesne - Sometimes I actually more interested in the sockets as opposed to the users as @cody-evaluate mentioned.

An example (my case) for that is for horizontal scaling purposes