Network.WebSockets.Util.PubSub

This is a simple utility module to implement a publish-subscribe pattern. Note that this only allows communication in a single direction: pusing data from the server to connected clients (browsers).

Usage:

• Create a new PubSub handle using newPubSub
• Subscribe your clients using the subscribe call
• Push new updates from the server using the publish call

Documentation

data PubSub p

A handle which keeps track of subscribed clients

newPubSub :: IO (PubSub p)

Create a new PubSub handle, with no clients initally connected

publish :: PubSub p -> Message p -> IO ()

Broadcast a message to all connected clients

subscribe :: Protocol p => PubSub p -> WebSockets p ()

Blocks forever