where
import Control.Arrow.ArrowIO
+import Control.Concurrent.STM
+import Control.Exception
+import Control.Monad
+import Control.Monad.Trans
+import Data.Set (Set)
+import qualified Data.Set as S
import Rakka.Page
import Rakka.Storage.DefaultPage
import Subversion.Types
+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 Subversion.FileSystem
+import Subversion.Repository
+import Text.HyperEstraier hiding (WriteLock)
+
+logger = "Rakka.Storage"
+
+
+data Storage
+ = Storage {
+ stoIndexRevLocked :: !(TVar Bool)
+ , stoIndexRevFile :: !FilePath
+ , stoIndexDB :: !Database
+ , stoRepository :: !Repository
+ , stoMakeDraft :: !(Page -> IO Document)
+ }
+
+
+mkStorage :: FilePath -> Repository -> (Page -> IO Document) -> IO Storage
+mkStorage lsdir repos mkDraft
+ = do let indexDir = lsdir </> "index"
+ revFile = lsdir </> "indexRev"
+
+ revLocked <- newTVarIO False
+ indexDB <- openIndex indexDir revFile
+
+ let sto = Storage {
+ stoIndexRevLocked = revLocked
+ , stoIndexRevFile = revFile
+ , stoIndexDB = indexDB
+ , stoRepository = repos
+ , stoMakeDraft = mkDraft
+ }
+
+ syncIndex sto
+ return sto
+
+
+getPage :: MonadIO m => Storage -> PageName -> Maybe RevNum -> m (Maybe Page)
+getPage = ((liftIO .) .) . getPage' . stoRepository
+
+
+getPage' :: Repository -> PageName -> Maybe RevNum -> IO (Maybe Page)
+getPage' repos name rev
+ = loadDefaultPage name -- FIXME
-data Storage = Storage -- FIXME
+putPage :: MonadIO m => Storage -> Page -> RevNum -> m ()
+putPage sto page oldRev
+ = error "FIXME: not implemented"
-mkStorage :: IO Storage -- FIXME
-mkStorage = return Storage
+getPageA :: ArrowIO a => Storage -> a (PageName, Maybe RevNum) (Maybe Page)
+getPageA = arrIO2 . getPage
-getPage :: Storage -> PageName -> IO (Maybe Page)
-getPage sto name
- = loadDefaultPage name -- FIXME
+putPageA :: ArrowIO a => Storage -> a (Page, RevNum) ()
+putPageA = arrIO2 . putPage
-putPage :: Storage -> Maybe RevNum -> Page -> IO ()
-putPage sto oldRev page
- = error "FIXME: not implemented"
+findAllPages :: Storage -> RevNum -> IO (Set PageName)
+findAllPages _ 0 = findAllDefaultPages
+findAllPages sto rev
+ = findAllDefaultPages -- FIXME
+
+
+findChangedPages :: Storage -> RevNum -> RevNum -> IO (Set PageName)
+findChangedPages sto 0 newRev = findAllPages sto newRev
+findChangedPages sto oldRev newRev
+ = fail "FIXME: not impl"
+
+
+getCurrentRevNum :: Storage -> IO RevNum
+getCurrentRevNum sto
+ = getRepositoryFS (stoRepository sto) >>= getYoungestRev
-getPageA :: ArrowIO a => Storage -> a PageName (Maybe Page)
-getPageA = arrIO . getPage
+-- casket を R/W モードで開く。成功したらそのまま返し、失敗したら
+-- indexDir と revFile を削除してから casket を R/W モードで開く。
+openIndex :: FilePath -> FilePath -> IO Database
+openIndex indexDir revFile
+ = do ret <- openDatabase indexDir (Writer [])
+ case ret of
+ Right db
+ -> do debugM logger ("Opened an H.E. database on " ++ indexDir)
+ return db
+ Left err
+ -> do warningM logger ("Failed to open an H.E. database on "
+ ++ indexDir ++ ": " ++ show err)
-putPageA :: ArrowIO a => Storage -> a (Maybe RevNum, Page) ()
-putPageA = arrIO2 . putPage
\ No newline at end of file
+ indexExists <- doesDirectoryExist indexDir
+ when indexExists
+ $ removeDirectoryRecursive indexDir
+
+ revFileExists <- doesFileExist revFile
+ when revFileExists
+ $ removeFile revFile
+
+ Right db <- openDatabase indexDir (Writer [Create []])
+ noticeM logger ("Created an H.E. database on " ++ indexDir)
+
+ return db
+
+
+syncIndex :: Storage -> IO ()
+syncIndex sto
+ = updateIndexRev sto $ \ oldRev ->
+ do debugM logger ("The index revision is currently " ++ show oldRev)
+
+ newRev <- getCurrentRevNum sto
+ debugM logger ("The repository revision is currently " ++ show newRev)
+
+ when (newRev /= oldRev) (syncIndex' oldRev newRev)
+ return newRev
+ where
+ syncIndex' :: RevNum -> RevNum -> IO ()
+ syncIndex' oldRev newRev
+ = do pages <- findChangedPages sto oldRev newRev
+ mapM_ (updateIndex sto newRev) (S.toList pages)
+
+
+updateIndex :: Storage -> RevNum -> PageName -> IO ()
+updateIndex sto rev name
+ = do pageM <- getPage sto name (Just rev)
+ case pageM of
+ -- ページが削除された
+ Nothing
+ -> do docIdM <- getDocIdByURI (stoIndexDB sto) (mkRakkaURI name)
+ case docIdM of
+ Nothing -> return ()
+ Just docId -> do removeDocument (stoIndexDB sto) docId [CleaningRemove]
+ infoM logger ("Removed page " ++ name ++ " from the index")
+ Just page
+ -> do draft <- stoMakeDraft sto page
+ putDocument (stoIndexDB sto) draft [CleaningPut]
+ infoM logger ("Indexed page " ++ name ++ " of revision " ++ show (pageRevision page))
+
+
+updateIndexRev :: Storage -> (RevNum -> IO RevNum) -> IO ()
+updateIndexRev sto f = bracket acquireLock releaseLock update
+ where
+ acquireLock :: IO Fd
+ acquireLock
+ = do atomically $ do revLocked <- readTVar (stoIndexRevLocked sto)
+ if revLocked then
+ retry
+ else
+ writeTVar (stoIndexRevLocked sto) True
+ fd <- openFd (stoIndexRevFile sto) ReadWrite (Just stdFileMode) defaultFileFlags
+ waitToSetLock fd (WriteLock, AbsoluteSeek, 0, 0)
+ return fd
+
+ releaseLock :: Fd -> IO ()
+ releaseLock fd
+ = do setLock fd (Unlock, AbsoluteSeek, 0, 0)
+ atomically $ writeTVar (stoIndexRevLocked sto) False
+
+ 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")
\ No newline at end of file
projects / Rakka.git / blobdiff