diff options
Diffstat (limited to 'src/Erebos/Object/Internal.hs')
| -rw-r--r-- | src/Erebos/Object/Internal.hs | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/src/Erebos/Object/Internal.hs b/src/Erebos/Object/Internal.hs index 312c3af..03ee83c 100644 --- a/src/Erebos/Object/Internal.hs +++ b/src/Erebos/Object/Internal.hs @@ -16,17 +16,6 @@ module Erebos.Object.Internal ( storeObject, collectObjects, collectStoredObjects, - Head, HeadType(..), - HeadTypeID, mkHeadTypeID, - headId, headStorage, headRef, headObject, headStoredObject, - loadHeads, loadHead, reloadHead, - storeHead, replaceHead, updateHead, updateHead_, - loadHeadRaw, storeHeadRaw, replaceHeadRaw, - - WatchedHead, - watchHead, watchHeadWith, unwatchHead, - watchHeadRaw, - MonadStorage(..), Storable(..), ZeroStorable(..), @@ -84,7 +73,6 @@ import qualified Data.ByteString.Lazy.Char8 as BLC import Data.Char import Data.Function import qualified Data.HashTable.IO as HT -import Data.List import qualified Data.Map as M import Data.Maybe import Data.Ratio @@ -98,13 +86,10 @@ import Data.Time.Calendar import Data.Time.Clock import Data.Time.Format import Data.Time.LocalTime -import Data.Typeable import Data.UUID (UUID) import qualified Data.UUID as U -import qualified Data.UUID.V4 as U import System.Directory -import System.FSNotify import System.FilePath import System.IO.Error import System.IO.Unsafe @@ -404,194 +389,9 @@ collectOtherStored seen (Rec items) = foldr helper ([], seen) $ map snd items collectOtherStored seen _ = ([], seen) -type Head = Head' Complete - -headId :: Head a -> HeadID -headId (Head uuid _) = uuid - -headStorage :: Head a -> Storage -headStorage = refStorage . headRef - -headRef :: Head a -> Ref -headRef (Head _ sx) = storedRef sx - -headObject :: Head a -> a -headObject (Head _ sx) = fromStored sx - -headStoredObject :: Head a -> Stored a -headStoredObject (Head _ sx) = sx - deriving instance StorableUUID HeadID deriving instance StorableUUID HeadTypeID -mkHeadTypeID :: String -> HeadTypeID -mkHeadTypeID = maybe (error "Invalid head type ID") HeadTypeID . U.fromString - -class Storable a => HeadType a where - headTypeID :: proxy a -> HeadTypeID - - -headTypePath :: FilePath -> HeadTypeID -> FilePath -headTypePath spath (HeadTypeID tid) = spath </> "heads" </> U.toString tid - -headPath :: FilePath -> HeadTypeID -> HeadID -> FilePath -headPath spath tid (HeadID hid) = headTypePath spath tid </> U.toString hid - -loadHeads :: forall a m. MonadIO m => HeadType a => Storage -> m [Head a] -loadHeads s@(Storage { stBacking = StorageDir { dirPath = spath }}) = liftIO $ do - let hpath = headTypePath spath $ headTypeID @a Proxy - - files <- filterM (doesFileExist . (hpath </>)) =<< - handleJust (\e -> guard (isDoesNotExistError e)) (const $ return []) - (getDirectoryContents hpath) - fmap catMaybes $ forM files $ \hname -> do - case U.fromString hname of - Just hid -> do - (h:_) <- BC.lines <$> B.readFile (hpath </> hname) - Just ref <- readRef s h - return $ Just $ Head (HeadID hid) $ wrappedLoad ref - Nothing -> return Nothing -loadHeads Storage { stBacking = StorageMemory { memHeads = theads } } = liftIO $ do - let toHead ((tid, hid), ref) | tid == headTypeID @a Proxy = Just $ Head hid $ wrappedLoad ref - | otherwise = Nothing - catMaybes . map toHead <$> readMVar theads - -loadHead :: forall a m. (HeadType a, MonadIO m) => Storage -> HeadID -> m (Maybe (Head a)) -loadHead st hid = fmap (Head hid . wrappedLoad) <$> loadHeadRaw st (headTypeID @a Proxy) hid - -loadHeadRaw :: forall m. MonadIO m => Storage -> HeadTypeID -> HeadID -> m (Maybe Ref) -loadHeadRaw s@(Storage { stBacking = StorageDir { dirPath = spath }}) tid hid = liftIO $ do - handleJust (guard . isDoesNotExistError) (const $ return Nothing) $ do - (h:_) <- BC.lines <$> B.readFile (headPath spath tid hid) - Just ref <- readRef s h - return $ Just ref -loadHeadRaw Storage { stBacking = StorageMemory { memHeads = theads } } tid hid = liftIO $ do - lookup (tid, hid) <$> readMVar theads - -reloadHead :: (HeadType a, MonadIO m) => Head a -> m (Maybe (Head a)) -reloadHead (Head hid (Stored (Ref st _) _)) = loadHead st hid - -storeHead :: forall a m. MonadIO m => HeadType a => Storage -> a -> m (Head a) -storeHead st obj = do - let tid = headTypeID @a Proxy - stored <- wrappedStore st obj - hid <- storeHeadRaw st tid (storedRef stored) - return $ Head hid stored - -storeHeadRaw :: forall m. MonadIO m => Storage -> HeadTypeID -> Ref -> m HeadID -storeHeadRaw st tid ref = liftIO $ do - hid <- HeadID <$> U.nextRandom - case stBacking st of - StorageDir { dirPath = spath } -> do - Right () <- writeFileChecked (headPath spath tid hid) Nothing $ - showRef ref `B.append` BC.singleton '\n' - return () - StorageMemory { memHeads = theads } -> do - modifyMVar_ theads $ return . (((tid, hid), ref) :) - return hid - -replaceHead :: forall a m. (HeadType a, MonadIO m) => Head a -> Stored a -> m (Either (Maybe (Head a)) (Head a)) -replaceHead prev@(Head hid pobj) stored' = liftIO $ do - let st = headStorage prev - tid = headTypeID @a Proxy - stored <- copyStored st stored' - bimap (fmap $ Head hid . wrappedLoad) (const $ Head hid stored) <$> - replaceHeadRaw st tid hid (storedRef pobj) (storedRef stored) - -replaceHeadRaw :: forall m. MonadIO m => Storage -> HeadTypeID -> HeadID -> Ref -> Ref -> m (Either (Maybe Ref) Ref) -replaceHeadRaw st tid hid prev new = liftIO $ do - case stBacking st of - StorageDir { dirPath = spath } -> do - let filename = headPath spath tid hid - showRefL r = showRef r `B.append` BC.singleton '\n' - - writeFileChecked filename (Just $ showRefL prev) (showRefL new) >>= \case - Left Nothing -> return $ Left Nothing - Left (Just bs) -> do Just oref <- readRef st $ BC.takeWhile (/='\n') bs - return $ Left $ Just oref - Right () -> return $ Right new - - StorageMemory { memHeads = theads, memWatchers = twatch } -> do - res <- modifyMVar theads $ \hs -> do - ws <- map wlFun . filter ((==(tid, hid)) . wlHead) . wlList <$> readMVar twatch - return $ case partition ((==(tid, hid)) . fst) hs of - ([] , _ ) -> (hs, Left Nothing) - ((_, r):_, hs') | r == prev -> (((tid, hid), new) : hs', - Right (new, ws)) - | otherwise -> (hs, Left $ Just r) - case res of - Right (r, ws) -> mapM_ ($ r) ws >> return (Right r) - Left x -> return $ Left x - -updateHead :: (HeadType a, MonadIO m) => Head a -> (Stored a -> m (Stored a, b)) -> m (Maybe (Head a), b) -updateHead h f = do - (o, x) <- f $ headStoredObject h - replaceHead h o >>= \case - Right h' -> return (Just h', x) - Left Nothing -> return (Nothing, x) - Left (Just h') -> updateHead h' f - -updateHead_ :: (HeadType a, MonadIO m) => Head a -> (Stored a -> m (Stored a)) -> m (Maybe (Head a)) -updateHead_ h = fmap fst . updateHead h . (fmap (,()) .) - - -data WatchedHead = forall a. WatchedHead Storage WatchID (MVar a) - -watchHead :: forall a. HeadType a => Head a -> (Head a -> IO ()) -> IO WatchedHead -watchHead h = watchHeadWith h id - -watchHeadWith :: forall a b. (HeadType a, Eq b) => Head a -> (Head a -> b) -> (b -> IO ()) -> IO WatchedHead -watchHeadWith (Head hid (Stored (Ref st _) _)) sel cb = do - watchHeadRaw st (headTypeID @a Proxy) hid (sel . Head hid . wrappedLoad) cb - -watchHeadRaw :: forall b. Eq b => Storage -> HeadTypeID -> HeadID -> (Ref -> b) -> (b -> IO ()) -> IO WatchedHead -watchHeadRaw st tid hid sel cb = do - memo <- newEmptyMVar - let addWatcher wl = (wl', WatchedHead st (wlNext wl) memo) - where wl' = wl { wlNext = wlNext wl + 1 - , wlList = WatchListItem - { wlID = wlNext wl - , wlHead = (tid, hid) - , wlFun = \r -> do - let x = sel r - modifyMVar_ memo $ \prev -> do - when (Just x /= prev) $ cb x - return $ Just x - } : wlList wl - } - - watched <- case stBacking st of - StorageDir { dirPath = spath, dirWatchers = mvar } -> modifyMVar mvar $ \(mbmanager, ilist, wl) -> do - manager <- maybe startManager return mbmanager - ilist' <- case tid `elem` ilist of - True -> return ilist - False -> do - void $ watchDir manager (headTypePath spath tid) (const True) $ \case - Added { eventPath = fpath } | Just ihid <- HeadID <$> U.fromString (takeFileName fpath) -> do - loadHeadRaw st tid ihid >>= \case - Just ref -> do - (_, _, iwl) <- readMVar mvar - mapM_ ($ ref) . map wlFun . filter ((== (tid, ihid)) . wlHead) . wlList $ iwl - Nothing -> return () - _ -> return () - return $ tid : ilist - return $ first ( Just manager, ilist', ) $ addWatcher wl - - StorageMemory { memWatchers = mvar } -> modifyMVar mvar $ return . addWatcher - - cur <- fmap sel <$> loadHeadRaw st tid hid - maybe (return ()) cb cur - putMVar memo cur - - return watched - -unwatchHead :: WatchedHead -> IO () -unwatchHead (WatchedHead st wid _) = do - let delWatcher wl = wl { wlList = filter ((/=wid) . wlID) $ wlList wl } - case stBacking st of - StorageDir { dirWatchers = mvar } -> modifyMVar_ mvar $ return . second delWatcher - StorageMemory { memWatchers = mvar } -> modifyMVar_ mvar $ return . delWatcher - class Monad m => MonadStorage m where getStorage :: m Storage @@ -605,9 +405,6 @@ class Monad m => MonadStorage m where instance MonadIO m => MonadStorage (ReaderT Storage m) where getStorage = ask -instance MonadIO m => MonadStorage (ReaderT (Head a) m) where - getStorage = asks $ headStorage - class Storable a where store' :: a -> Store |