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Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Data     Network    

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Websockets represent a channel between a client and a server. ws-chans carries this concept deeper into your code by setting up an Control.Concurrent.Chan.Unagi.InChan and an Control.Concurrent.Chan.Unagi.OutChan as an interface to a websocket server. To send a message to the server you simply write a message to the InChan. To receive a message from the server you read from the OutChan.

The tests are probably the best place to look at some example usage but basically:

import           Control.Monad                        (forM, forever)
import           Data.Text                            (Text)
import           Network.WebSockets.Chan.Unagi        as Unagi

example :: IO [Text]
example = do
    (ic, oc, cic) <- Unagi.newChans "localhost" 8080 "" :: IO (Unagi.InChan Text, Unagi.OutChan Text, Unagi.InChan Text)
    Unagi.writeList2Chan ic msgs
    res <- forM msgs (\_ -> Unagi.readChan oc)
    Unagi.writeChan cic ("finished" :: Text)
    return res

newChans returns a tuple of:

  • an InChan which you write messages to, these will be sent to the websocket server
  • an OutChan which you read messages from, these are messages that have come from the websocket server
  • an InChan for closing the connection. This should have the same type as the first InChan. When you write a message to this InChan it will tell the server that you wish to close the connection. See the source code and Network.WebSockets.sendClose for more information on how this works.