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{-
Copyright (C) 2008 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- Functions for maintaining user list and session state.
-}
module Network.Gitit.Cache ( expireCachedFile
, lookupCache
, cacheContents )
where
import qualified Data.ByteString as B (ByteString, readFile, writeFile)
import System.FilePath
import System.Directory (doesFileExist, removeFile, createDirectoryIfMissing, getModificationTime)
import System.Time (ClockTime)
import Network.Gitit.State
import Network.Gitit.Types
import Control.Monad
import Control.Monad.Trans (liftIO)
-- | Expire a cached file, identified by its filename in the filestore.
-- Returns () after deleting a file from the cache, fails if no cached file.
expireCachedFile :: String -> GititServerPart ()
expireCachedFile file = do
cfg <- getConfig
let target = cacheDir cfg </> file
exists <- liftIO $ doesFileExist target
if exists
then liftIO (removeFile target)
else mzero
lookupCache :: String -> GititServerPart (Maybe (ClockTime, B.ByteString))
lookupCache file = do
cfg <- getConfig
let target = cacheDir cfg </> file
exists <- liftIO $ doesFileExist target
if exists
then liftIO $ do
modtime <- getModificationTime target
contents <- B.readFile target
return $ Just (modtime, contents)
else return Nothing
cacheContents :: String -> B.ByteString -> GititServerPart ()
cacheContents file contents = do
cfg <- getConfig
let target = cacheDir cfg </> file
let targetDir = takeDirectory target
liftIO $ do
createDirectoryIfMissing True targetDir
B.writeFile (cacheDir cfg </> file) contents
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