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|
{- Sqlite database of information about Keys
-
- Copyright 2015-2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE ScopedTypeVariables #-}
module Database.Keys (
DbHandle,
addAssociatedFile,
getAssociatedFiles,
getAssociatedKey,
removeAssociatedFile,
scanAssociatedFiles,
storeInodeCaches,
addInodeCaches,
getInodeCaches,
removeInodeCaches,
) where
import qualified Database.Keys.SQL as SQL
import Database.Types
import Database.Keys.Handle
import qualified Database.Queue as H
import Annex.Locations
import Annex.Common hiding (delete)
import qualified Annex
import Annex.Perms
import Annex.LockFile
import Utility.InodeCache
import Annex.InodeSentinal
import qualified Git.Types
import qualified Git.LsTree
import qualified Git.Branch
import Git.Ref
import Git.FilePath
import Annex.CatFile
import Database.Esqueleto hiding (Key)
{- Runs an action that reads from the database.
-
- If the database doesn't already exist, it's not created; mempty is
- returned instead. This way, when the keys database is not in use,
- there's minimal overhead in checking it.
-
- If the database is already open, any writes are flushed to it, to ensure
- consistency.
-
- Any queued writes will be flushed before the read.
-}
runReader :: Monoid v => (SQL.ReadHandle -> Annex v) -> Annex v
runReader a = do
h <- getDbHandle
withDbState h go
where
go DbUnavailable = return (mempty, DbUnavailable)
go st@(DbOpen qh) = do
liftIO $ H.flushDbQueue qh
v <- a (SQL.ReadHandle qh)
return (v, st)
go DbClosed = do
st' <- openDb False DbClosed
v <- case st' of
(DbOpen qh) -> a (SQL.ReadHandle qh)
_ -> return mempty
return (v, st')
runReaderIO :: Monoid v => (SQL.ReadHandle -> IO v) -> Annex v
runReaderIO a = runReader (liftIO . a)
{- Runs an action that writes to the database. Typically this is used to
- queue changes, which will be flushed at a later point.
-
- The database is created if it doesn't exist yet. -}
runWriter :: (SQL.WriteHandle -> Annex ()) -> Annex ()
runWriter a = do
h <- getDbHandle
withDbState h go
where
go st@(DbOpen qh) = do
v <- a (SQL.WriteHandle qh)
return (v, st)
go st = do
st' <- openDb True st
v <- case st' of
DbOpen qh -> a (SQL.WriteHandle qh)
_ -> error "internal"
return (v, st')
runWriterIO :: (SQL.WriteHandle -> IO ()) -> Annex ()
runWriterIO a = runWriter (liftIO . a)
{- Gets the handle cached in Annex state; creates a new one if it's not yet
- available, but doesn't open the database. -}
getDbHandle :: Annex DbHandle
getDbHandle = go =<< Annex.getState Annex.keysdbhandle
where
go (Just h) = pure h
go Nothing = do
h <- liftIO newDbHandle
Annex.changeState $ \s -> s { Annex.keysdbhandle = Just h }
return h
{- Opens the database, perhaps creating it if it doesn't exist yet.
-
- Multiple readers and writers can have the database open at the same
- time. Database.Handle deals with the concurrency issues.
- The lock is held while opening the database, so that when
- the database doesn't exist yet, one caller wins the lock and
- can create it undisturbed.
-}
openDb :: Bool -> DbState -> Annex DbState
openDb _ st@(DbOpen _) = return st
openDb False DbUnavailable = return DbUnavailable
openDb createdb _ = catchPermissionDenied permerr $ withExclusiveLock gitAnnexKeysDbLock $ do
dbdir <- fromRepo gitAnnexKeysDb
let db = dbdir </> "db"
dbexists <- liftIO $ doesFileExist db
case (dbexists, createdb) of
(True, _) -> open db
(False, True) -> do
liftIO $ do
createDirectoryIfMissing True dbdir
H.initDb db SQL.createTables
setAnnexDirPerm dbdir
setAnnexFilePerm db
open db
(False, False) -> return DbUnavailable
where
open db = liftIO $ DbOpen <$> H.openDbQueue db SQL.containedTable
-- If permissions don't allow opening the database, treat it as if
-- it does not exist.
permerr e = case createdb of
False -> return DbUnavailable
True -> throwM e
addAssociatedFile :: Key -> TopFilePath -> Annex ()
addAssociatedFile k f = runWriterIO $ SQL.addAssociatedFile (toIKey k) f
{- Note that the files returned were once associated with the key, but
- some of them may not be any longer. -}
getAssociatedFiles :: Key -> Annex [TopFilePath]
getAssociatedFiles = runReaderIO . SQL.getAssociatedFiles . toIKey
{- Gets any keys that are on record as having a particular associated file.
- (Should be one or none but the database doesn't enforce that.) -}
getAssociatedKey :: TopFilePath -> Annex [Key]
getAssociatedKey = map fromIKey <$$> runReaderIO . SQL.getAssociatedKey
removeAssociatedFile :: Key -> TopFilePath -> Annex ()
removeAssociatedFile k = runWriterIO . SQL.removeAssociatedFile (toIKey k)
{- Find all unlocked associated files. This is expensive, and so normally
- the associated files are updated incrementally when changes are noticed. -}
scanAssociatedFiles :: Annex ()
scanAssociatedFiles = whenM (isJust <$> inRepo Git.Branch.current) $
runWriter $ \h -> do
showSideAction "scanning for unlocked files"
dropallassociated h
(l, cleanup) <- inRepo $ Git.LsTree.lsTree headRef
forM_ l $ \i ->
when (isregfile i) $
maybe noop (add h i)
=<< catKey (Git.LsTree.sha i)
liftIO $ void cleanup
where
dropallassociated h = liftIO $ flip SQL.queueDb h $
delete $ from $ \(_r :: SqlExpr (Entity SQL.Associated)) ->
return ()
isregfile i = Git.Types.toBlobType (Git.LsTree.mode i) == Just Git.Types.FileBlob
add h i k = liftIO $ flip SQL.queueDb h $
void $ insertUnique $ SQL.Associated
(toIKey k)
(toSFilePath $ getTopFilePath $ Git.LsTree.file i)
{- Stats the files, and stores their InodeCaches. -}
storeInodeCaches :: Key -> [FilePath] -> Annex ()
storeInodeCaches k fs = withTSDelta $ \d ->
addInodeCaches k . catMaybes =<< liftIO (mapM (`genInodeCache` d) fs)
addInodeCaches :: Key -> [InodeCache] -> Annex ()
addInodeCaches k is = runWriterIO $ SQL.addInodeCaches (toIKey k) is
{- A key may have multiple InodeCaches; one for the annex object, and one
- for each pointer file that is a copy of it. -}
getInodeCaches :: Key -> Annex [InodeCache]
getInodeCaches = runReaderIO . SQL.getInodeCaches . toIKey
removeInodeCaches :: Key -> Annex ()
removeInodeCaches = runWriterIO . SQL.removeInodeCaches . toIKey
|
