StatusCode is now a type class, not an algebraic data type.

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

diff --git a/Network/HTTP/Lucu/Abortion.hs b/Network/HTTP/Lucu/Abortion.hs
index 26ea8b01e9bc4c6f5da8735e2af12046493dd324..064a97ebd8671232b9053a6382d93c85927df318 100644 (file)
--- a/Network/HTTP/Lucu/Abortion.hs
+++ b/Network/HTTP/Lucu/Abortion.hs
@@ -1,117 +1,50 @@
 {-# LANGUAGE
-    DeriveDataTypeable
-  , UnicodeSyntax
+    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(..)
+    ( Abortion
+    , mkAbortion
+    , mkAbortion'
+
     , abort
-    , abortPurely
-    , abortSTM
-    , abortA
-    , 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
-
-
-data Abortion = Abortion {
-      aboStatus  :: !StatusCode
-    , aboHeaders :: !Headers
-    , aboMessage :: !(Maybe String)
-    } deriving (Show, Typeable)
-
-instance Exception Abortion
-
--- |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 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
---    @status@ and such like as a HTTP response to be sent to the
---    client.
---
--- 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'.
---
--- 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.
---
--- > 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)
-
--- |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 -> [ (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, ([ (String, String) ], Maybe String)) c
-abortA 
-    = arrIO3 abort
-
--- 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
-        Just msg
-            -> let [html] = unsafePerformIO 
-                            $ runX ( mkDefaultPage conf (aboStatus abo) (txt msg)
-                                     >>>
-                                     writeDocumentToString [ withIndent True ]
-                                   )
-               in
-                 html
-        Nothing
-            -> let res'  = res { resStatus = aboStatus abo }
-                   res'' = foldl (.) id [setHeader name value
-                                             | (name, value) <- fromHeaders $ aboHeaders abo] res'
-               in
-                 getDefaultPage conf reqM res''
+import Control.Exception
+import Control.Monad.Trans
+import Data.Ascii (Ascii, CIAscii)
+import Data.Monoid.Unicode
+import Data.Text (Text)
+import Network.HTTP.Lucu.Abortion.Internal
+import Network.HTTP.Lucu.Headers
+import Network.HTTP.Lucu.Response
+import Prelude.Unicode
+
+-- |Construct an 'Abortion' with additional headers and an optional
+-- message text.
+mkAbortion ∷ StatusCode sc ⇒ sc → [(CIAscii, Ascii)] → Maybe Text → Abortion
+{-# INLINE mkAbortion #-}
+mkAbortion sc hdr msg
+    = Abortion {
+        aboStatus  = fromStatusCode sc
+      , aboHeaders = toHeaders hdr
+      , aboMessage = msg
+      }
+
+-- |Construct an 'Abortion' without any additional headers but with a
+-- message text.
+mkAbortion' ∷ StatusCode sc ⇒ sc → Text → Abortion
+{-# INLINE mkAbortion' #-}
+mkAbortion' sc msg
+    = Abortion {
+        aboStatus  = fromStatusCode sc
+      , aboHeaders = (∅)
+      , aboMessage = Just msg
+      }
+
+-- |Throw an 'Abortion' in a 'MonadIO', including the very
+-- 'Network.HTTP.Lucu.Resource.Resource' monad.
+abort ∷ MonadIO m ⇒ Abortion → m a
+{-# INLINE abort #-}
+abort = liftIO ∘ throwIO