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{-|
Description: Implement custom storage backend
Exports type class, which can be used to create custom 'Storage' backend.
-}
module Erebos.Storage.Backend (
StorageBackend(..),
Complete, Partial,
Storage, PartialStorage,
newStorage,
withStorageBackend,
refDigestBytes,
allocateScrubbedBytes,
unsafeUseScrubbedBytesAsCStringLen,
WatchID, startWatchID, nextWatchID,
) where
import Control.Concurrent.MVar
import Data.ByteArray qualified as BA
import Data.ByteString (ByteString)
import Data.HashTable.IO qualified as HT
import Foreign.C.String
import Foreign.Ptr
import ConvertByteString
import Erebos.Object.Internal
import Erebos.Storage.Internal
newStorage :: StorageBackend bck => bck -> IO (Storage' (BackendCompleteness bck))
newStorage stBackend = do
stRefGeneration <- newMVar =<< HT.new
stRefRoots <- newMVar =<< HT.new
return Storage {..}
withStorageBackend :: Storage' c -> (forall bck. (StorageBackend bck, BackendCompleteness bck ~ c) => bck -> IO a) -> IO a
withStorageBackend Storage {..} f = f stBackend
refDigestBytes :: RefDigest -> ByteString
refDigestBytes = toByteString
allocateScrubbedBytes :: Int -> (Ptr a -> IO ()) -> IO ScrubbedBytes
allocateScrubbedBytes len f = snd <$> BA.allocRet len f
unsafeUseScrubbedBytesAsCStringLen :: ScrubbedBytes -> (CStringLen -> IO a) -> IO a
unsafeUseScrubbedBytesAsCStringLen sb f = withByteArray sb (\ptr -> f ( ptr, BA.length sb ))
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