109 lines
4.8 KiB
Haskell
109 lines
4.8 KiB
Haskell
module Utils.Files
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( sinkFile, sinkFiles
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, sinkFile', sinkFiles'
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, FileUploads
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, replaceFileReferences
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) where
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import Import.NoFoundation
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import Foundation.Type
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import Handler.Utils.Minio
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import qualified Network.Minio as Minio
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import qualified Crypto.Hash as Crypto (hash)
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import qualified Data.Conduit.Combinators as C
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import qualified Data.ByteString.Base64.URL as Base64
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import qualified Data.ByteArray as ByteArray
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import qualified Data.Map.Lazy as Map
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import qualified Data.Set as Set
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import Control.Monad.Trans.State.Lazy (execStateT)
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import Control.Monad.State.Class (modify)
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import Database.Persist.Sql (deleteWhereCount)
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sinkFiles :: (MonadThrow m, MonadHandler m, HandlerSite m ~ UniWorX) => ConduitT File FileReference (SqlPersistT m) ()
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sinkFiles = C.mapM sinkFile
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sinkFile :: (MonadThrow m, MonadHandler m, HandlerSite m ~ UniWorX) => File -> SqlPersistT m FileReference
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sinkFile File{ fileContent = Nothing, .. } = return FileReference
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{ fileReferenceContent = Nothing
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, fileReferenceTitle = fileTitle
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, fileReferenceModified = fileModified
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}
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sinkFile File{ fileContent = Just fileContentContent, .. } = do
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inDB <- exists [ FileContentHash ==. fileContentHash ]
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let sinkFileDB = unless inDB $ repsert (FileContentKey fileContentHash) FileContent{..}
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maybeT sinkFileDB $ do
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let uploadName = decodeUtf8 . Base64.encodeUnpadded $ ByteArray.convert fileContentHash
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uploadBucket <- getsYesod $ views appSettings appUploadCacheBucket
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unless inDB . runAppMinio $ do
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uploadExists <- handleIf minioIsDoesNotExist (const $ return False) $ True <$ Minio.statObject uploadBucket uploadName Minio.defaultGetObjectOptions
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unless uploadExists $ do
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let
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pooOptions = Minio.defaultPutObjectOptions
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{ Minio.pooCacheControl = Just "immutable"
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}
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Minio.putObject uploadBucket uploadName (C.sourceLazy $ fromStrict fileContentContent) (Just . fromIntegral $ olength fileContentContent) pooOptions
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-- Note that MinIO does not accept length zero uploads without an explicit length specification (not `Nothing` in the line above for the api we use)
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return FileReference
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{ fileReferenceContent = Just fileContentHash
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, fileReferenceTitle = fileTitle
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, fileReferenceModified = fileModified
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}
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where
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fileContentHash = Crypto.hash fileContentContent
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sinkFiles' :: (MonadThrow m, MonadHandler m, HandlerSite m ~ UniWorX, HasFileReference record) => ConduitT (File, FileReferenceResidual record) record (SqlPersistT m) ()
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sinkFiles' = C.mapM $ uncurry sinkFile'
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sinkFile' :: (MonadThrow m, MonadHandler m, HandlerSite m ~ UniWorX, HasFileReference record) => File -> FileReferenceResidual record -> SqlPersistT m record
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sinkFile' file residual = do
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reference <- sinkFile file
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return $ _FileReference # (reference, residual)
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type FileUploads = ConduitT () FileReference (HandlerFor UniWorX) ()
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replaceFileReferences :: ( MonadHandler m, MonadThrow m
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, HandlerSite m ~ UniWorX
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, HasFileReference record
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, PersistEntityBackend record ~ SqlBackend
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)
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=> (FileReferenceResidual record -> [Filter record])
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-> FileReferenceResidual record
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-> FileUploads
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-> SqlPersistT m (Set (Key record), Set (Key record)) -- ^ @(oldFiles, changes)@
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replaceFileReferences mkFilter residual fs = do
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let resFilter = mkFilter residual
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oldFiles <- Map.fromListWith Set.union . map (\(Entity k v) -> (v ^. _FileReference . _1, Set.singleton k)) <$> selectList resFilter []
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let oldFiles' = setOf (folded . folded) oldFiles
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let
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finsert fRef
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| Just sfIds <- fRef `Map.lookup` oldFiles
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= modify $ Map.mapMaybe (assertM' (not . Set.null) . (\\ sfIds))
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| otherwise = do
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let fRef' = _FileReference # (fRef, residual)
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forM_ (persistUniqueKeys fRef') $ \u -> maybeT (return ()) $ do
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Entity cKey cVal <- MaybeT . lift $ getBy u
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deleted <- lift . lift . deleteWhereCount $ resFilter <> [ persistIdField ==. cKey ]
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unless (deleted == 1) $
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throwM . userError $ "replaceFileReferences tried to delete outside of filter/database inconsistency: deleted=" <> show deleted
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lift . modify $ Map.alter (Just . maybe (Set.singleton cKey) (Set.insert cKey)) (cVal ^. _FileReference . _1)
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fId <- lift $ insert fRef'
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modify $ Map.alter (Just . maybe (Set.singleton fId) (Set.insert fId)) fRef
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changes <- fmap (setOf $ folded . folded) . flip execStateT oldFiles . runConduit $ transPipe liftHandler fs .| C.mapM_ finsert
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deleteWhere $ resFilter <> [ persistIdField <-. Set.toList (oldFiles' `Set.intersection` changes) ]
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return (oldFiles', changes)
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