Socket Io Rooms Redis

Within each namespace you can also define arbitrary channels that sockets can join and leave.

Socket io rooms redis.

The socket io redis adapter broadcasts and receives messages on particularly named redis channels. The base channel name. Creating a real time chat app with redis node js and socket io if you have redis node js and the heroku toolbelt installed on your machine then you ve got everything you need to build a real. Does socket io redis keep connections upon restart in cluster mode.

To facilitate this use case we created two modules. Socket on disconnect function console log io sockets adapter rooms. Once socket io establishes connection we used the redis client to subscribe to chatmessages and activeusers channels. Prefix namespace in broadcasting to a single room the channel name is.

For every socket connection the user makes we add the socket instance to a room dedicated for this user. This is the default socket io in memory adapter class. Prefix namespace room prefix. There are several ways to tackle this problem like implementing your own channel to send messages into the process.

For global broadcasts the channel name is. Rooms are used to further separate concerns. Let s call the room room josh. We checked for any message event triggered by a published message.

The rooms that the socket which is disconnecting from still appear in the print out yet their values will appear as empty arrays indicating no remaining users. One thing to keep in mind while using rooms is. 296 opened nov 19 2018 by cschwaderer the function that takes a list of sockets in a room takes a long time. Socket io rooms a much better approach can be to use socket io rooms to maintain the individual connections for a user.

We then broadcasted the message with socket io using message event for messages from chatmessage channel and users event for messages from activeusers channel. This is the adapter using the redis pub sub mechanism to broadcast messages between multiple nodes. These channels are called rooms. Rooms also share the same socket connection like namespaces.