CODEWITHSUNDEEP
javascriptnode.jssocket.io
SamS87
SamS87

Reputation: 41

How can i get some info on a Socket in socket.io version 4.x

As i upgraded to version 4.x of socket.io on nodeJs i run into issues with certain things breaking. Here is 2 issues i am facing one is to get a list of all rooms a socket is part of. When i call socket.rooms after a client is connected i get a correct response that list all rooms in a set.

Based on what i read using io.sockets.sockets[536xdN11uf311xkFAAAD].rooms but that gets me the below error.

TypeError: Cannot read property 'rooms' of undefined

How can i get the rooms for a given socket in 4.x

Also how can i get the socket info for a given socket without calling io.sockets.sockets then doing a for each on it to find the socket i am looking for.

Upvotes: 0

Views: 628

Answers (1)

jfriend00
jfriend00

Reputation: 707158

How can i get the rooms for a given socket in 4.x

socket.rooms is a Set object that lists the rooms a given socket is in. This is documented for socket.io v4.

If you have the socket.id instead of the socket object, you can do:

const sockets = await io.in(theSocketId).fetchSockets();

This will be an array of sockets, but if you passed in a socket id, there will be zero or one items in the array depending upon whether that socketid exists or not. This is in the doc here and is a fairly new way to do things.

So, putting these together:

async function getRooms(socketid) {
    const sockets = await io.in(socketid).fetchSockets();
    if (!sockets.length) {
         throw new Error(`socketid ${socketid} is not found`);
    }
    return Array.from(sockets[0].rooms);
}

Note: you will have deal with promises when using this interface (likely because of the support for remote adapters via redis or other clustered adapters).

Upvotes: 1

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