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|
{- Sqlite database used for tracking a key's associated files.
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-:
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE QuasiQuotes, TypeFamilies, TemplateHaskell #-}
{-# LANGUAGE OverloadedStrings, GADTs, FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses, GeneralizedNewtypeDeriving #-}
{-# LANGUAGE RankNTypes #-}
module Database.AssociatedFiles (
DbHandle,
openDb,
flushDb,
closeDb,
addDb,
getDb,
removeDb,
AssociatedId,
) where
import Database.Types
import Database.AssociatedFiles.Types
import qualified Database.Handle as H
import Locations
import Common hiding (delete)
import Annex
import Types.Key
import Annex.Perms
import Annex.LockFile
import Messages
import Database.Persist.TH
import Database.Esqueleto hiding (Key)
share [mkPersist sqlSettings, mkMigrate "migrateAssociated"] [persistLowerCase|
Associated
key SKey
file FilePath
KeyFileIndex key file
|]
{- Opens the database, creating it if it doesn't exist yet. -}
openDb :: Annex DbHandle
openDb = withExclusiveLock gitAnnexAssociatedFilesDbLock $ do
dbdir <- fromRepo gitAnnexAssociatedFilesDb
let db = dbdir </> "db"
unlessM (liftIO $ doesFileExist db) $ do
liftIO $ do
createDirectoryIfMissing True dbdir
H.initDb db $ void $
runMigrationSilent migrateAssociated
setAnnexDirPerm dbdir
setAnnexFilePerm db
h <- liftIO $ H.openDb db "associated"
-- work around https://github.com/yesodweb/persistent/issues/474
liftIO setConsoleEncoding
return $ DbHandle h
closeDb :: DbHandle -> IO ()
closeDb (DbHandle h) = H.closeDb h
withDbHandle :: (H.DbHandle -> IO a) -> Annex a
withDbHandle a = do
(DbHandle h) <- dbHandle
liftIO $ a h
dbHandle :: Annex DbHandle
dbHandle = maybe startup return =<< Annex.getState Annex.associatedfilesdbhandle
where
startup = do
h <- openDb
Annex.changeState $ \s -> s { Annex.associatedfilesdbhandle = Just h }
return h
{- Flushes any changes made to the database. -}
flushDb :: Annex ()
flushDb = withDbHandle H.flushQueueDb
addDb :: Key -> FilePath -> Annex ()
addDb k f = withDbHandle $ \h -> H.queueDb h (\_ _ -> pure True) $ do
-- If the same file was associated with a different key before,
-- remove that.
delete $ from $ \r -> do
where_ (r ^. AssociatedFile ==. val f &&. r ^. AssociatedKey ==. val sk)
void $ insertUnique $ Associated sk f
where
sk = toSKey k
{- Note that the files returned used to be associated with the key, but
- some of them may not be any longer. -}
getDb :: Key -> Annex [FilePath]
getDb k = withDbHandle $ \h -> H.queryDb h $ getDb' $ toSKey k
getDb' :: SKey -> SqlPersistM [FilePath]
getDb' sk = do
l <- select $ from $ \r -> do
where_ (r ^. AssociatedKey ==. val sk)
return (r ^. AssociatedFile)
return $ map unValue l
removeDb :: Key -> FilePath -> Annex ()
removeDb k f = withDbHandle $ \h -> H.queueDb h (\_ _ -> pure True) $
delete $ from $ \r -> do
where_ (r ^. AssociatedKey ==. val sk &&. r ^. AssociatedFile ==. val f)
where
sk = toSKey k
|
