Add room create and delete events.

[vincentwoo]

Also consolidate del and delAll functions a bit to be more symmetrical with add and addAll.

Previously, del would not remove the sids[id] entry even if it deleted the socket's last room.

Addresses socketio/socket.io#2897

[darrachequesne]

Thanks for the pull request.

Previously, del would not remove the sids[id] entry even if it deleted the socket's last room.

Actually, I'm not sure that makes sense here, since the socket would have to leave its own room too (since every socket joins the room designated by its id).

Regarding your use case, since the rooms are not shared between several adapters, you'll have to handle those cases:

server1.on('connection', (socket) => {
  socket.join('my-room'); // emit 'create-room' with 'my-room' 
});
// then, on another node
server2.on('connection', (socket) => {
  socket.join('my-room'); // emit 'create-room' with 'my-room' (again) 
});

[darrachequesne]

Merged as 155fa63 and included in socket.io-adapter@2.1.0 & socket.io@3.1.0. Thanks!

[vincentwoo]

whoa, four years later! trippy