{-# LANGUAGE
- DeriveDataTypeable
+ Arrows
+ , DeriveDataTypeable
+ , TypeOperators
, UnicodeSyntax
#-}
-{-# OPTIONS_HADDOCK prune #-}
-- |Aborting the computation of 'Network.HTTP.Lucu.Resource.Resource'
-- in any 'Prelude.IO' monads or arrows.
module Network.HTTP.Lucu.Abortion
( Abortion(..)
+
, abort
, abortPurely
, abortSTM
, abortPage
)
where
-
-import Control.Arrow
-import Control.Arrow.ArrowIO
-import Control.Concurrent.STM
-import Control.Exception
-import Control.Monad.Trans
-import qualified Data.ByteString.Char8 as C8
-import Data.Typeable
-import GHC.Conc (unsafeIOToSTM)
-import Network.HTTP.Lucu.Config
-import Network.HTTP.Lucu.DefaultPage
-import Network.HTTP.Lucu.Headers
-import Network.HTTP.Lucu.Request
-import Network.HTTP.Lucu.Response
-import System.IO.Unsafe
-import Text.XML.HXT.Arrow.WriteDocument
-import Text.XML.HXT.Arrow.XmlArrow
-import Text.XML.HXT.Arrow.XmlState
-
+import Blaze.ByteString.Builder (Builder)
+import qualified Blaze.ByteString.Builder.Char.Utf8 as BB
+import Control.Arrow.ArrowIO
+import Control.Arrow.ListArrow
+import Control.Arrow.Unicode
+import Control.Concurrent.STM
+import Control.Exception
+import Control.Monad.Trans
+import Data.Ascii (Ascii, CIAscii)
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Typeable
+import Network.HTTP.Lucu.Config
+import Network.HTTP.Lucu.DefaultPage
+import Network.HTTP.Lucu.Headers
+import Network.HTTP.Lucu.Request
+import Network.HTTP.Lucu.Response
+import Prelude.Unicode
+import Text.XML.HXT.Arrow.WriteDocument
+import Text.XML.HXT.Arrow.XmlArrow
+import Text.XML.HXT.Arrow.XmlState
data Abortion = Abortion {
- aboStatus :: !StatusCode
- , aboHeaders :: !Headers
- , aboMessage :: !(Maybe String)
- } deriving (Show, Typeable)
+ aboStatus ∷ !StatusCode
+ , aboHeaders ∷ !Headers
+ , aboMessage ∷ !(Maybe Text)
+ } deriving (Eq, Show, Typeable)
instance Exception Abortion
-- 'Network.HTTP.Lucu.Resource.Resource' monad with given status,
-- additional response headers, and optional message string.
--
--- What this really does is to throw a special
--- 'Control.Exception.Exception'. The exception will be caught by the
--- Lucu system.
+-- What this really does is to throw an instance of 'Exception'. The
+-- exception will be caught by the Lucu system.
--
-- 1. If the 'Network.HTTP.Lucu.Resource.Resource' is in the /Deciding
-- Header/ or any precedent states, it is possible to use the
--
-- 2. Otherwise the HTTP response can't be modified anymore so the
-- only possible thing the system can do is to dump it to the
--- stderr. See
--- 'Network.HTTP.Lucu.Config.cnfDumpTooLateAbortionToStderr'.
+-- stderr. See 'cnfDumpTooLateAbortionToStderr'.
--
--- Note that the status code doesn't have to be an error code so you
--- can use this action for redirection as well as error reporting e.g.
+-- Note that the status code doesn't necessarily have to be an error
+-- code so you can use this action for redirection as well as error
+-- reporting e.g.
--
-- > abort MovedPermanently
-- > [("Location", "http://example.net/")]
-- > (Just "It has been moved to example.net")
-abort :: MonadIO m => StatusCode -> [ (String, String) ] -> Maybe String -> m a
-abort status headers msg
- = status `seq` headers `seq` msg `seq`
- let abo = Abortion status (toHeaders $ map pack headers) msg
- in
- liftIO $ throwIO abo
- where
- pack (x, y) = (C8.pack x, C8.pack y)
+abort ∷ MonadIO m ⇒ StatusCode → [ (CIAscii, Ascii) ] → Maybe Text → m a
+{-# INLINE abort #-}
+abort status headers
+ = liftIO ∘ throwIO ∘ Abortion status (toHeaders headers)
-- |This is similar to 'abort' but computes it with
-- 'System.IO.Unsafe.unsafePerformIO'.
-abortPurely :: StatusCode -> [ (String, String) ] -> Maybe String -> a
-abortPurely = ((unsafePerformIO .) .) . abort
+abortPurely ∷ StatusCode → [ (CIAscii, Ascii) ] → Maybe Text → a
+{-# INLINE abortPurely #-}
+abortPurely status headers
+ = throw ∘ Abortion status (toHeaders headers)
-- |Computation of @'abortSTM' status headers msg@ just computes
-- 'abort' in a 'Control.Monad.STM.STM' monad.
-abortSTM :: StatusCode -> [ (String, String) ] -> Maybe String -> STM a
-abortSTM status headers msg
- = status `seq` headers `seq` msg `seq`
- unsafeIOToSTM $! abort status headers msg
+abortSTM ∷ StatusCode → [ (CIAscii, Ascii) ] → Maybe Text → STM a
+{-# INLINE abortSTM #-}
+abortSTM status headers
+ = throwSTM ∘ Abortion status (toHeaders headers)
-- | Computation of @'abortA' -< (status, (headers, msg))@ just
-- computes 'abort' in an 'Control.Arrow.ArrowIO.ArrowIO'.
-abortA :: ArrowIO a => a (StatusCode, ([ (String, String) ], Maybe String)) c
-abortA
- = arrIO3 abort
+abortA ∷ ArrowIO (⇝) ⇒ (StatusCode, ([ (CIAscii, Ascii) ], Maybe Text)) ⇝ c
+{-# INLINE abortA #-}
+abortA = proc (status, (headers, msg)) →
+ arrIO throwIO ⤙ Abortion status (toHeaders headers) msg
-- aboMessage が Just なら單に mkDefaultPage に渡すだけで良いので樂だが、
-- Nothing の場合は getDefaultPage を使ってデフォルトのメッセージを得な
-- ければならない。
-abortPage :: Config -> Maybe Request -> Response -> Abortion -> String
+abortPage ∷ Config → Maybe Request → Response → Abortion → Builder
abortPage conf reqM res abo
- = conf `seq` reqM `seq` res `seq` abo `seq`
- case aboMessage abo of
+ = case aboMessage abo of
Just msg
- -> let [html] = unsafePerformIO
- $ runX ( mkDefaultPage conf (aboStatus abo) (txt msg)
- >>>
- writeDocumentToString [ withIndent True ]
- )
- in
- html
+ → let [html] = runLA ( mkDefaultPage conf (aboStatus abo) (txt $ T.unpack msg)
+ ⋙
+ writeDocumentToString [ withIndent True ]
+ ) ()
+ in
+ BB.fromString html
Nothing
- -> let res' = res { resStatus = aboStatus abo }
- res'' = foldl (.) id [setHeader name value
- | (name, value) <- fromHeaders $ aboHeaders abo] res'
+ → let res' = res { resStatus = aboStatus abo }
+ res'' = foldl (∘) id [setHeader name value
+ | (name, value) ← fromHeaders $ aboHeaders abo] res'
in
getDefaultPage conf reqM res''
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