Prefix namespace in broadcasting to a single room the channel name is.
Socket io rooms redis.
Rooms are used to further separate concerns.
296 opened nov 19 2018 by cschwaderer the function that takes a list of sockets in a room takes a long time.
There are several ways to tackle this problem like implementing your own channel to send messages into the process.
Once socket io establishes connection we used the redis client to subscribe to chatmessages and activeusers channels.
We then broadcasted the message with socket io using message event for messages from chatmessage channel and users event for messages from activeusers channel.
Socket on disconnect function console log io sockets adapter rooms.
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.
This is the default socket io in memory adapter class.
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.
Socket io rooms a much better approach can be to use socket io rooms to maintain the individual connections for a user.
Rooms also share the same socket connection like namespaces.
Let s call the room room josh.
This is the adapter using the redis pub sub mechanism to broadcast messages between multiple nodes.
In some cases you might want to emit events to sockets in socket io namespaces rooms from outside the context of your socket io processes.
Default value is socket io.
Within each namespace you can also define arbitrary channels that sockets can join and leave.
Prefix namespace room prefix.
These channels are called rooms.
For global broadcasts the channel name is.
To facilitate this use case we created two modules.
One thing to keep in mind while using rooms is.
We checked for any message event triggered by a published message.
The socket io redis adapter broadcasts and receives messages on particularly named redis channels.
Does socket io redis keep connections upon restart in cluster mode.
