, mkStorage -- private
, getPage
- , savePage
+ , putPage
+
+ , getPageA
+ , putPageA
+
+ , searchPages
)
where
+import Control.Arrow.ArrowIO
+import Control.Concurrent
+import Control.Concurrent.STM
+import Control.Exception
+import Control.Monad
+import Control.Monad.Trans
+import Data.Maybe
+import Data.Set (Set)
+import qualified Data.Set as S
+import Network.URI
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 {
+ stoRepository :: !Repository
+ , stoIndexChan :: !(TChan IndexReq)
+ }
+
+
+data IndexReq
+ = SyncIndex
+ | SearchIndex !Condition !(TMVar [(PageName, RevNum)])
-data Storage = Storage -- FIXME
+mkStorage :: FilePath -> Repository -> (Page -> IO Document) -> IO Storage
+mkStorage lsdir repos mkDraft
+ = do chan <- startIndexManager lsdir repos mkDraft
+ let sto = Storage {
+ stoRepository = repos
+ , stoIndexChan = chan
+ }
+ syncIndex sto
+ return sto
-mkStorage :: IO Storage -- FIXME
-mkStorage = return Storage
+getPage :: MonadIO m => Storage -> PageName -> Maybe RevNum -> m (Maybe Page)
+getPage = ((liftIO .) .) . getPage' . stoRepository
-getPage :: Storage -> PageName -> IO (Maybe Page)
-getPage sto name
+getPage' :: Repository -> PageName -> Maybe RevNum -> IO (Maybe Page)
+getPage' repos name rev
= loadDefaultPage name -- FIXME
-savePage :: Storage -> PageName -> Page -> IO ()
-savePage sto name page
+putPage :: MonadIO m => Storage -> Page -> RevNum -> m ()
+putPage sto page oldRev
= error "FIXME: not implemented"
+
+
+getPageA :: ArrowIO a => Storage -> a (PageName, Maybe RevNum) (Maybe Page)
+getPageA = arrIO2 . getPage
+
+
+putPageA :: ArrowIO a => Storage -> a (Page, RevNum) ()
+putPageA = arrIO2 . putPage
+
+
+searchPages :: MonadIO m => Storage -> Condition -> m [(PageName, RevNum)]
+searchPages sto cond
+ = liftIO $
+ do var <- newEmptyTMVarIO
+ atomically $ writeTChan (stoIndexChan sto) (SearchIndex cond var)
+ atomically $ takeTMVar var
+
+
+syncIndex :: Storage -> IO ()
+syncIndex sto
+ = atomically $ writeTChan (stoIndexChan sto) SyncIndex
+
+
+findAllPages :: Repository -> RevNum -> IO (Set PageName)
+findAllPages _ 0 = findAllDefaultPages
+findAllPages repos rev
+ = findAllDefaultPages -- FIXME
+
+
+findChangedPages :: Repository -> RevNum -> RevNum -> IO (Set PageName)
+findChangedPages repos 0 newRev = findAllPages repos newRev
+findChangedPages repos oldRev newRev
+ = fail "FIXME: not impl"
+
+
+getCurrentRevNum :: Repository -> IO RevNum
+getCurrentRevNum repos
+ = getRepositoryFS repos >>= getYoungestRev
+
+
+startIndexManager :: FilePath -> Repository -> (Page -> IO Document) -> IO (TChan IndexReq)
+startIndexManager lsdir repos mkDraft
+ = do chan <- newTChanIO
+ index <- openIndex indexDir revFile
+ forkIO (loop chan index)
+ return chan
+ where
+ indexDir = lsdir </> "index"
+ revFile = lsdir </> "indexRev"
+
+ loop :: TChan IndexReq -> Database -> IO ()
+ loop chan index
+ = do req <- atomically $ readTChan chan
+ case req of
+ SyncIndex
+ -> syncIndex' index revFile repos mkDraft
+ SearchIndex cond var
+ -> do result <- searchIndex index cond
+ atomically $ putTMVar var result
+ loop chan index
+
+
+-- 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 index
+ -> do debugM logger ("Opened an H.E. index on " ++ indexDir)
+ return index
+
+ Left err
+ -> do warningM logger ("Failed to open an H.E. index on "
+ ++ indexDir ++ ": " ++ show err)
+
+ indexExists <- doesDirectoryExist indexDir
+ when indexExists
+ $ removeDirectoryRecursive indexDir
+
+ revFileExists <- doesFileExist revFile
+ when revFileExists
+ $ removeFile revFile
+
+ Right index <- openDatabase indexDir (Writer [Create []])
+ addAttrIndex index "@uri" SeqIndex
+ addAttrIndex index "rakka:revision" SeqIndex
+ noticeM logger ("Created an H.E. index on " ++ indexDir)
+
+ return index
+
+
+syncIndex' :: Database -> FilePath -> Repository -> (Page -> IO Document) -> IO ()
+syncIndex' index revFile repos mkDraft
+ = updateIndexRev revFile $ \ oldRev ->
+ do debugM logger ("The index revision is currently " ++ show oldRev)
+
+ newRev <- getCurrentRevNum repos
+ 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 repos oldRev newRev
+ mapM_ (updateIndex index repos mkDraft newRev) (S.toList pages)
+
+
+searchIndex :: Database -> Condition -> IO [(PageName, RevNum)]
+searchIndex index cond
+ = searchDatabase index cond >>= mapM fromId
+ where
+ fromId :: DocumentID -> IO (PageName, RevNum)
+ fromId docId
+ = do uri <- getDocURI index docId
+ rev <- getDocAttr index docId "rakka:revision"
+ >>= return . read . fromJust
+ return (decodePageName $ uriPath uri, rev)
+
+
+updateIndex :: Database
+ -> Repository
+ -> (Page -> IO Document)
+ -> RevNum
+ -> PageName
+ -> IO ()
+updateIndex index repos mkDraft rev name
+ = do pageM <- getPage' repos name (Just rev)
+ case pageM of
+ -- ページが削除された
+ Nothing
+ -> do docIdM <- getDocIdByURI index (mkRakkaURI name)
+ case docIdM of
+ Nothing -> return ()
+ Just docId -> do removeDocument index docId [CleaningRemove]
+ infoM logger ("Removed page " ++ name ++ " from the index")
+ Just page
+ -> do draft <- mkDraft page
+ putDocument index draft [CleaningPut]
+ infoM logger ("Indexed page " ++ name ++ " of revision " ++ show (pageRevision page))
+
+
+updateIndexRev :: FilePath -> (RevNum -> IO RevNum) -> IO ()
+updateIndexRev revFile f = bracket acquireLock releaseLock 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")
\ No newline at end of file
projects / Rakka.git / blobdiff