beginning of implementation of Rakka.Authorization

[Rakka.git] / Rakka / Storage / Impl.hs

diff --git a/Rakka/Storage/Impl.hs b/Rakka/Storage/Impl.hs
index 2c36f516c2a012dfe64189ca3adaca0fa5da924c..d6d53a4f517d8fdae02fe2deec3e8e5c8b7467cb 100644 (file)
--- a/Rakka/Storage/Impl.hs
+++ b/Rakka/Storage/Impl.hs
@@ -8,7 +8,6 @@ module Rakka.Storage.Impl
 
 import           Control.Concurrent
 import           Control.Concurrent.STM
-import           Control.Exception
 import           Control.Monad
 import           Data.Maybe
 import           Data.Set (Set)
@@ -26,9 +25,6 @@ import           System.Directory
 import           System.FilePath
 import           System.IO
 import           System.Log.Logger
-import           System.Posix.Files
-import           System.Posix.Types
-import           System.Posix.IO
 import           Text.HyperEstraier hiding (WriteLock)
 
 
@@ -187,37 +183,15 @@ updateIndex index repos mkDraft rev name
 
 
 updateIndexRev :: FilePath -> (RevNum -> IO RevNum) -> IO ()
-updateIndexRev revFile f = bracket acquireLock releaseLock update
+updateIndexRev revFile f = withFile revFile ReadWriteMode update
     where
-      acquireLock :: IO Fd
-      acquireLock
-          = do fd <- openFd revFile ReadWrite (Just stdFileMode) defaultFileFlags
-               waitToSetLock fd (WriteLock, AbsoluteSeek, 0, 0)
-               return fd
-
-      releaseLock :: Fd -> IO ()
-      releaseLock fd
-          = setLock fd (Unlock, AbsoluteSeek, 0, 0)
-
-      update :: Fd -> IO ()
-      update fd
-          = do fdSeek fd AbsoluteSeek 0
-               size <- return . fromIntegral . fileSize =<< getFdStatus fd
-               (revStr, gotSize) <- fdRead fd size
-               when (size /= gotSize) $ fail ("read " ++ show gotSize ++
-                                              " bytes but expected " ++ show size ++ " bytes")
-               
-               let rev = case revStr of
-                           "" -> 0
-                           _  -> read revStr
-
-               rev' <- f rev
-
-               let revStr' = show rev' ++ "\n"
-                   size'   = fromIntegral $ length revStr'
-
-               fdSeek fd AbsoluteSeek 0
-               setFdSize fd 0
-               wroteSize <- fdWrite fd revStr'
-               when (size' /= wroteSize) $ fail ("wrote " ++ show wroteSize ++
-                                                 " bytes but expected " ++ show size' ++ " bytes")
+      update :: Handle -> IO ()
+      update h = do eof  <- hIsEOF h
+                    rev  <- if eof then
+                                return 0
+                            else
+                                hGetLine h >>= return . read
+                    rev' <- f rev
+                    hSeek h AbsoluteSeek 0
+                    hSetFileSize h 0
+                    hPutStrLn h (show rev')