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module Ssb.Aux where
import Protolude
import Data.Aeson as Aeson
import Data.ByteString.Lazy as BS (toStrict)
import Data.ByteString.Char8 as BS (pack, unpack)
import Data.Default
import Data.Serialize as Serialize
import Data.Either.Combinators ( mapLeft
, mapRight
)
import Control.Concurrent.STM
import System.IO ( hFlush
, hGetLine
, hSetBinaryMode
)
import System.Process
-- | Convertible describes instances where types can be easily converted.
class Convertible a b where
convert :: a -> b
-- | decodeJSON deserializes the JSON bytestring.
-- It is a reimplementation Aeson's eitherDecodeStrict which returns Text
-- instead of String.
decodeJSON :: (FromJSON a) => ByteString -> Either Text a
decodeJSON = mapLeft toS . Aeson.eitherDecodeStrict
encodeJSON :: (ToJSON a) => a -> ByteString
encodeJSON = BS.toStrict . Aeson.encode
encodeByteString :: Serialize.Serialize a => a -> ByteString
encodeByteString = Serialize.encode
decodeByteString :: Serialize.Serialize a => ByteString -> Either Text a
decodeByteString a = mapLeft toS $ Serialize.decode a
withErr :: Text -> Maybe a -> Either Text a
withErr = maybeToRight
error :: Text -> Either Text a
error = Left
maybeWord8 :: Int -> Either Text Word8
maybeWord8 arg = if arg >= min && arg <= max
then return $ fromIntegral arg
else Left "out of bounds"
where
min = fromIntegral (minBound :: Word8)
max = fromIntegral (maxBound :: Word8)
-- | TODO: kill command forked by forkCommand
command :: Text -> TMVar ByteString -> TMVar ByteString -> IO ()
command cmd input output = do
(hIn, hOut, hErr, hProc) <- runInteractiveCommand (toS cmd)
hSetBinaryMode hIn False
hSetBinaryMode hOut False
hSetBinaryMode hErr False
let loop = do
v <- atomically $ takeTMVar input
hPutStr hIn (BS.unpack v :: [Char])
hFlush hIn
v' <- hGetLine hOut
atomically $ putTMVar output (BS.pack v')
loop
loop
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