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How to save server side state using Snap Framework?

Server-side sessions are not yet included in the Snap Framework. Is there a way to add some kind of server-side state?

Suppose I want to increase the counter for each HTTP request. How should I do it?

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3 answers

The easiest way is to put the state behind mvar:

fooHandler :: MVar Int -> Snap ()
fooHandler mvar = do
    x <- liftIO $ modifyMVar mvar $ \y -> let y'=y+1 in (y',y')
    writeBS $ S.pack $ "Incremented counter to: " ++ show x

Initialize mvar when initializing the site. Hope this helps.

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The above answer is correct as far as possible, but it does not address some real problems.

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