Abortion

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

diff --git a/Network/HTTP/Lucu/Abortion.hs b/Network/HTTP/Lucu/Abortion.hs
index 6e74bea21d40d8d473a28645aecdf13c8278fbb2..9ef433b15f99361a2e1dbf4f17d288de38ca743e 100644 (file)
--- a/Network/HTTP/Lucu/Abortion.hs
+++ b/Network/HTTP/Lucu/Abortion.hs
@@ -1,5 +1,8 @@
 {-# LANGUAGE
-    DeriveDataTypeable
+    Arrows
+  , BangPatterns
+  , DeriveDataTypeable
+  , TypeOperators
   , UnicodeSyntax
   #-}
 {-# OPTIONS_HADDOCK prune #-}
@@ -16,19 +19,21 @@ module Network.HTTP.Lucu.Abortion
     )
     where
 import Control.Arrow
-import Control.Arrow.ArrowIO
+import Control.Arrow.ListArrow
+import Control.Arrow.Unicode
 import Control.Concurrent.STM
 import Control.Exception
 import Control.Monad.Trans
-import qualified Data.ByteString.Char8 as C8
+import Data.Ascii (Ascii, CIAscii)
+import Data.Text (Text)
 import qualified Data.Text as T
-import Data.Text.Encoding
 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
@@ -36,10 +41,10 @@ import Text.XML.HXT.Arrow.XmlState
 data Abortion = Abortion {
       aboStatus  :: !StatusCode
     , aboHeaders :: !Headers
-    , aboMessage :: !(Maybe String)
-    } deriving (Eq, Show, Typeable, Exception)
+    , aboMessage :: !(Maybe Text)
+    } deriving (Eq, Show, Typeable)
 
---instance Exception Abortion
+instance Exception Abortion
 
 -- |Computation of @'abort' status headers msg@ aborts the
 -- 'Network.HTTP.Lucu.Resource.Resource' monad with given status,
@@ -65,51 +70,48 @@ data Abortion = Abortion {
 -- > 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 :: Arrow (⇝) ⇒ (StatusCode, ([ (CIAscii, Ascii) ], Maybe Text)) ⇝ c
+{-# INLINE abortA #-}
+abortA = proc (status, (headers, msg)) →
+         returnA ⤙ abortPurely status 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 conf reqM res abo
-    = conf `seq` reqM `seq` res `seq` abo `seq`
-      case aboMessage abo of
+abortPage :: Config → Maybe Request → Response → Abortion → Text
+abortPage !conf !reqM !res !abo
+    = 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
+                T.pack html
         Nothing
             → let res'  = res { resStatus = aboStatus abo }
-                   res'' = foldl (.) id [setHeader name value
-                                             | (name, value) <- fromHeaders $ aboHeaders abo] res'
+                  res'' = foldl (∘) id [setHeader name value
+                                            | (name, value) ← fromHeaders $ aboHeaders abo] res'
                in
                  getDefaultPage conf reqM res''