Haskell: http-streams and Aeson

Re:Haskell: http-streams and Aeson by enigmo on Saturday June 01, 2013 @10:33AM (#5804084)

It's not all that difficult, since io-streams has attoparsec support and aeson is an attoparsec parser... coded directly in the input box, I don't have io-streams installed so I can't see if this typechecks:

    import Control.Applicative
    import Data.Aeson
    import Data.ByteString
    import System.IO.Streams
    import System.IO.Streams.Attoparsec (parseFromStream)

    parseJSONFromStream :: FromJSON a => InputStream ByteString -> IO a
    parseJSONFromStream = parseJSON <$> parseFromStream json'

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Re:Haskell: http-streams and Aeson by joshrotenberg on Saturday June 01, 2013 @11:46AM (#5804429)

I started looking at attoparsec after the post. Thanks, I'll look closer and see if I can figure it out.

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Re:Haskell: http-streams and Aeson by joshrotenberg on Saturday June 01, 2013 @12:35PM (#5804657)

Found this: https://github.com/RobinKrom/Mtgox/blob/master/src/Mtgox/Htt...

receiveResponse con (\_ i -> parseFromStream json i))

This seems to work but without the benefit of being marshalled into my type.

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Re:Haskell: http-streams and Aeson by enigmo on Saturday June 01, 2013 @01:28PM (#5804956)

The `parseJSON <$>` bit in my sample converts it to your type. If you don't like the infix applicative it could be written as:

    receiveResponse con (fmap parseJSON . parseFromStream json)

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