Fixed breakage on GHC 6.10.1

[Lucu.git] / Network / HTTP / Lucu / Abortion.hs

diff --git a/Network/HTTP/Lucu/Abortion.hs b/Network/HTTP/Lucu/Abortion.hs
index 0a5ed07ff5435913e02beaba0cfbf7a905ed9a50..52e7e23d6047b2e0fb6d824fa500e1f393269414 100644 (file)
--- a/Network/HTTP/Lucu/Abortion.hs
+++ b/Network/HTTP/Lucu/Abortion.hs
@@ -1,10 +1,11 @@
--- #prune
+{-# 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
     , abortA
     , abortPage
@@ -16,7 +17,7 @@ import           Control.Arrow.ArrowIO
 import           Control.Concurrent.STM
 import           Control.Exception
 import           Control.Monad.Trans
-import           Data.ByteString.Base (ByteString)
+import qualified Data.ByteString.Char8 as C8
 import           Data.Dynamic
 import           GHC.Conc (unsafeIOToSTM)
 import           Network.HTTP.Lucu.Config
@@ -37,13 +38,17 @@ data Abortion = Abortion {
     , aboMessage :: !(Maybe String)
     } deriving (Show, Typeable)
 
+instance Exception Abortion where
+    toException = SomeException
+    fromException (SomeException e) = cast e
+
 -- |Computation of @'abort' status headers msg@ aborts the
 -- 'Network.HTTP.Lucu.Resource.Resource' monad with given status,
 -- additional response headers, and optional message string.
 --
--- What this really does is to just throw a special
--- 'Control.Exception.DynException'. The exception will be caught by
--- the Lucu.
+-- What this really does is to throw a special
+-- 'Control.Exception.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
@@ -61,24 +66,30 @@ data Abortion = Abortion {
 -- > abort MovedPermanently
 -- >       [("Location", "http://example.net/")]
 -- >       (Just "It has been moved to example.net")
-abort :: MonadIO m => StatusCode -> [ (ByteString, ByteString) ] -> Maybe String -> m a
+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 headers) msg
-          exc = DynException (toDyn abo)
+      let abo = Abortion status (toHeaders $ map pack headers) msg
       in
-        liftIO $ throwIO exc
+        liftIO $ throwIO abo
+    where
+      pack (x, y) = (C8.pack x, C8.pack y)
+
+-- |This is similar to 'abort' but computes it with
+-- 'System.IO.Unsafe.unsafePerformIO'.
+abortPurely :: StatusCode -> [ (String, String) ] -> Maybe String -> a
+abortPurely = ((unsafePerformIO .) .) . abort
 
 -- |Computation of @'abortSTM' status headers msg@ just computes
 -- 'abort' in a 'Control.Monad.STM.STM' monad.
-abortSTM :: StatusCode -> [ (ByteString, ByteString) ] -> Maybe String -> STM a
+abortSTM :: StatusCode -> [ (String, String) ] -> Maybe String -> STM a
 abortSTM status headers msg
     = status `seq` headers `seq` msg `seq`
       unsafeIOToSTM $! abort status headers msg
 
 -- | Computation of @'abortA' -< (status, (headers, msg))@ just
 -- computes 'abort' in an 'Control.Arrow.ArrowIO.ArrowIO'.
-abortA :: ArrowIO a => a (StatusCode, ([ (ByteString, ByteString) ], Maybe String)) c
+abortA :: ArrowIO a => a (StatusCode, ([ (String, String) ], Maybe String)) c
 abortA 
     = arrIO3 abort