Optimization

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

diff --git a/Network/HTTP/Lucu/Postprocess.hs b/Network/HTTP/Lucu/Postprocess.hs
index 062a3bf6203c303195684999a4198cb510338700..6e8a5e6753b5bafdf6bbebc2448b76730e07afd3 100644 (file)
--- a/Network/HTTP/Lucu/Postprocess.hs
+++ b/Network/HTTP/Lucu/Postprocess.hs
@@ -6,7 +6,9 @@ module Network.HTTP.Lucu.Postprocess
 
 import           Control.Concurrent.STM
 import           Control.Monad
-import           Data.Char
+import           Data.ByteString.Base (ByteString)
+import qualified Data.ByteString.Char8 as C8
+import           Data.IORef
 import           Data.Maybe
 import           GHC.Conc (unsafeIOToSTM)
 import           Network.HTTP.Lucu.Abortion
@@ -18,6 +20,7 @@ import           Network.HTTP.Lucu.RFC1123DateTime
 import           Network.HTTP.Lucu.Request
 import           Network.HTTP.Lucu.Response
 import           System.Time
+import           System.IO.Unsafe
 
 {-
   
@@ -64,11 +67,11 @@ postprocess itr
                         $ Just ("The status code is not good for a final status: "
                                 ++ show sc)
 
-         when (sc == MethodNotAllowed && getHeader "Allow" res == Nothing)
+         when (sc == MethodNotAllowed && getHeader (C8.pack "Allow") res == Nothing)
                   $ abortSTM InternalServerError []
                         $ Just ("The status was " ++ show sc ++ " but no Allow header.")
 
-         when (sc /= NotModified && isRedirection sc && getHeader "Location" res == Nothing)
+         when (sc /= NotModified && isRedirection sc && getHeader (C8.pack "Location") res == Nothing)
                   $ abortSTM InternalServerError []
                         $ Just ("The status code was " ++ show sc ++ " but no Location header.")
 
@@ -97,37 +100,40 @@ postprocess itr
                                           status == ResetContent ||
                                           status == NotModified    )
 
-               updateRes itr $! deleteHeader "Content-Length"
-               updateRes itr $! deleteHeader "Transfer-Encoding"
+               updateRes itr $! deleteHeader (C8.pack "Content-Length")
+               updateRes itr $! deleteHeader (C8.pack "Transfer-Encoding")
 
-               cType <- readHeader itr "Content-Type"
+               cType <- readHeader itr (C8.pack "Content-Type")
                when (cType == Nothing)
-                        $ updateRes itr $ setHeader "Content-Type" defaultPageContentType
+                        $ updateRes itr $ setHeader (C8.pack "Content-Type") defaultPageContentType
 
                if canHaveBody then
                    when (reqVer == HttpVersion 1 1)
-                            $ do updateRes itr $! setHeader "Transfer-Encoding" "chunked"
+                            $ do updateRes itr $! setHeader (C8.pack "Transfer-Encoding") (C8.pack "chunked")
                                  writeItr itr itrWillChunkBody True
                  else
                    -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
                    when (reqMethod req /= HEAD)
-                            $ do updateRes itr $! deleteHeader "Content-Type"
-                                 updateRes itr $! deleteHeader "Etag"
-                                 updateRes itr $! deleteHeader "Last-Modified"
-
-               conn <- readHeader itr "Connection"
-               case fmap (map toLower) conn of
-                 Just "close" -> writeItr itr itrWillClose True
-                 _            -> return ()
+                            $ do updateRes itr $! deleteHeader (C8.pack "Content-Type")
+                                 updateRes itr $! deleteHeader (C8.pack "Etag")
+                                 updateRes itr $! deleteHeader (C8.pack "Last-Modified")
+
+               conn <- readHeader itr (C8.pack "Connection")
+               case conn of
+                 Nothing    -> return ()
+                 Just value -> if value `noCaseEq` C8.pack "close" then
+                                   writeItr itr itrWillClose True
+                               else
+                                   return ()
 
                willClose <- readItr itr itrWillClose id
                when willClose
-                        $ updateRes itr $! setHeader "Connection" "close"
+                        $ updateRes itr $! setHeader (C8.pack "Connection") (C8.pack "close")
 
                when (reqMethod req == HEAD || not canHaveBody)
                         $ writeTVar (itrWillDiscardBody itr) True
 
-      readHeader :: Interaction -> String -> STM (Maybe String)
+      readHeader :: Interaction -> ByteString -> STM (Maybe ByteString)
       readHeader itr name
           = itr `seq` name `seq`
             readItr itr itrResponse $ getHeader name
@@ -144,12 +150,29 @@ completeUnconditionalHeaders conf res
       return res >>= compServer >>= compDate >>= return
       where
         compServer res
-            = case getHeader "Server" res of
-                Nothing -> return $ addHeader "Server" (cnfServerSoftware conf) res
+            = case getHeader (C8.pack "Server") res of
+                Nothing -> return $ setHeader (C8.pack "Server") (cnfServerSoftware conf) res
                 Just _  -> return res
 
         compDate res
-            = case getHeader "Date" res of
-                Nothing -> do time <- getClockTime
-                              return $ addHeader "Date" (formatHTTPDateTime time) res
-                Just _  -> return res
\ No newline at end of file
+            = case getHeader (C8.pack "Date") res of
+                Nothing -> do date <- getCurrentDate
+                              return $ setHeader (C8.pack "Date") date res
+                Just _  -> return res
+
+
+cache :: IORef (ClockTime, ByteString)
+cache = unsafePerformIO $
+        newIORef (TOD 0 0, undefined)
+{-# NOINLINE cache #-}
+
+getCurrentDate :: IO ByteString
+getCurrentDate = do now@(TOD curSec _)           <- getClockTime
+                    (TOD cachedSec _, cachedStr) <- readIORef cache
+
+                    if curSec == cachedSec then
+                        return cachedStr
+                      else
+                        do let dateStr = C8.pack $ formatHTTPDateTime now
+                           writeIORef cache (now, dateStr)
+                           return dateStr
\ No newline at end of file