Socket.IO 2.0 Listing all clients of a Room in a variable

Question

i need help. I research about this topic too much but i don't find any solution.

We can list all clients of a Room with code below;

io.of('/').in('room').clients((error, clients) => {
    if error throw error;
    console.log(clients);
});

My question is how can I show this clients result in a variable.

I tried these solutions: 1)

var list = io.of('/').in('room').clients ((error, clients) => {
    if error throw error;
    return clients;
}); // didn't work

2)

async function getList() {
    return await io.of('/').in('room').clients((error, clients) => {
        if error throw error;
        return clients;
    });
}

Possible duplicate of [How do I return the response from an asynchronous call?](https://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call) — Marcos Casagrande, Jun 19 '18 at 13:35
@MarcosCasagrande It didn't work. I think ıt's not an async operation. — n3pixowe, Jun 19 '18 at 15:37
`const getList = function () { io.of('/').in(room).clients(async (error, clients) => { if (error) throw error; var cls = await clients; debug(cls); return cls; }); } debug(getList());` — n3pixowe, Jun 19 '18 at 15:45
Update the answer with the code, and that's not Promise wrapped — Marcos Casagrande, Jun 19 '18 at 15:45
@MarcosCasagrande I wrote my answer. The usage of my Code is this. Also, why i need to use Promise? Async/await is same, and It's syntax is Shooter than Promises. — n3pixowe, Jun 19 '18 at 15:47
Yes, if you want to convert `callback` to `Promise` you can't use `async/await` check my answer. — Marcos Casagrande, Jun 19 '18 at 15:49

score 4 · Accepted Answer · answered Jun 19 '18 at 15:48

Just wrap the code inside a Promise

function getClients() {

    return new Promise((resolve, reject) => {
        io.of('/').in('room').clients((error, clients) => {
            if(error)
                return reject(error);

            resolve(clients);
        });
    });

}

(async() => {
    const clients = await getClients();
})();

Socket.IO 2.0 Listing all clients of a Room in a variable

1 Answers1