575 lines
19 KiB
Haskell
575 lines
19 KiB
Haskell
{- git-annex chunked remotes
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-
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- Copyright 2014-2021 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE RankNTypes #-}
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module Remote.Helper.Chunked (
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ChunkSize,
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ChunkConfig(..),
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noChunks,
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describeChunkConfig,
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chunkConfigParsers,
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getChunkConfig,
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storeChunks,
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removeChunks,
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retrieveChunks,
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checkPresentChunks,
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chunkField,
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) where
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import Annex.Common
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import qualified Annex
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import Utility.DataUnits
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import Types.StoreRetrieve
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import Types.Remote
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import Types.ProposedAccepted
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import Logs.Chunk
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import Utility.Metered
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import Crypto
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import Backend (isStableKey)
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import Annex.SpecialRemote.Config
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import Annex.Verify
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import qualified Utility.RawFilePath as R
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Lazy as L
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data ChunkConfig
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= NoChunks
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| UnpaddedChunks ChunkSize
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| LegacyChunks ChunkSize
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deriving (Show)
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describeChunkConfig :: ChunkConfig -> String
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describeChunkConfig NoChunks = "none"
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describeChunkConfig (UnpaddedChunks sz) = describeChunkSize sz ++ " chunks"
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describeChunkConfig (LegacyChunks sz) = describeChunkSize sz ++ " chunks (old style)"
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describeChunkSize :: ChunkSize -> String
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describeChunkSize sz = roughSize storageUnits False (fromIntegral sz)
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noChunks :: ChunkConfig -> Bool
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noChunks NoChunks = True
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noChunks _ = False
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chunkConfigParsers :: [RemoteConfigFieldParser]
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chunkConfigParsers =
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[ optionalStringParser chunksizeField HiddenField -- deprecated
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, optionalStringParser chunkField
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(FieldDesc "size of chunks (eg, 1MiB)")
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]
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getChunkConfig :: ParsedRemoteConfig -> ChunkConfig
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getChunkConfig c =
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case getRemoteConfigValue chunksizeField c of
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Nothing -> case getRemoteConfigValue chunkField c of
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Nothing -> NoChunks
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Just v -> readsz UnpaddedChunks v chunkField
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Just v -> readsz LegacyChunks v chunksizeField
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where
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readsz mk v f = case readSize dataUnits v of
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Just size
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| size == 0 -> NoChunks
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| size > 0 -> mk (fromInteger size)
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_ -> giveup $ "bad configuration " ++ fromProposedAccepted f ++ "=" ++ v
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-- An infinite stream of chunk keys, starting from chunk 1.
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newtype ChunkKeyStream = ChunkKeyStream [Key]
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chunkKeyStream :: Key -> ChunkSize -> ChunkKeyStream
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chunkKeyStream basek chunksize = ChunkKeyStream $ map mk [1..]
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where
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mk chunknum = alterKey sizedk $ \d -> d
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{ keyChunkNum = Just chunknum }
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sizedk = alterKey basek $ \d -> d
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{ keyChunkSize = Just (toInteger chunksize) }
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nextChunkKeyStream :: ChunkKeyStream -> (Key, ChunkKeyStream)
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nextChunkKeyStream (ChunkKeyStream (k:l)) = (k, ChunkKeyStream l)
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nextChunkKeyStream (ChunkKeyStream []) = error "expected infinite ChunkKeyStream"
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takeChunkKeyStream :: ChunkCount -> ChunkKeyStream -> [Key]
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takeChunkKeyStream n (ChunkKeyStream l) = genericTake n l
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-- Number of chunks already consumed from the stream.
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numChunks :: ChunkKeyStream -> Integer
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numChunks = pred . fromJust . fromKey keyChunkNum . fst . nextChunkKeyStream
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{- Splits up the key's content into chunks, passing each chunk to
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- the storer action, along with a corresponding chunk key and a
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- progress meter update callback.
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-
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- To support resuming, the checker is used to find the first missing
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- chunk key. Storing starts from that chunk.
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-
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- This buffers each chunk in memory, so can use a lot of memory
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- with a large ChunkSize.
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- More optimal versions of this can be written, that rely
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- on L.toChunks to split the lazy bytestring into chunks (typically
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- smaller than the ChunkSize), and eg, write those chunks to a Handle.
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- But this is the best that can be done with the storer interface that
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- writes a whole L.ByteString at a time.
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-}
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storeChunks
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:: LensGpgEncParams encc
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=> UUID
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-> ChunkConfig
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-> EncKey
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-> Key
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-> FilePath
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-> MeterUpdate
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-> Maybe (Cipher, EncKey)
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-> encc
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-> Storer
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-> CheckPresent
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-> Annex ()
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storeChunks u chunkconfig encryptor k f p enc encc storer checker =
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case chunkconfig of
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-- Only stable keys are safe to store chunked,
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-- because an unstable key can have multiple different
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-- objects, and mixing up chunks from them would be
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-- possible without this check.
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(UnpaddedChunks chunksize) -> ifM (isStableKey k)
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( do
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h <- liftIO $ openBinaryFile f ReadMode
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go chunksize h
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liftIO $ hClose h
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, storechunk k (FileContent f) p
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)
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_ -> storechunk k (FileContent f) p
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where
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go chunksize h = do
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let chunkkeys = chunkKeyStream k chunksize
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(chunkkeys', startpos) <- seekResume h encryptor chunkkeys checker
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b <- liftIO $ L.hGetContents h
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gochunks p startpos chunksize b chunkkeys'
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gochunks :: MeterUpdate -> BytesProcessed -> ChunkSize -> L.ByteString -> ChunkKeyStream -> Annex ()
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gochunks meterupdate startpos chunksize = loop startpos . splitchunk
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where
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splitchunk = L.splitAt chunksize
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loop bytesprocessed (chunk, bs) chunkkeys
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| L.null chunk && numchunks > 0 = do
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-- Once all chunks are successfully
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-- stored, update the chunk log.
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chunksStored u k (FixedSizeChunks chunksize) numchunks
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| otherwise = do
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liftIO $ meterupdate' zeroBytesProcessed
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let (chunkkey, chunkkeys') = nextChunkKeyStream chunkkeys
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storechunk chunkkey (ByteContent chunk) meterupdate'
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let bytesprocessed' = addBytesProcessed bytesprocessed (L.length chunk)
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loop bytesprocessed' (splitchunk bs) chunkkeys'
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where
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numchunks = numChunks chunkkeys
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{- The MeterUpdate that is passed to the action
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- storing a chunk is offset, so that it reflects
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- the total bytes that have already been stored
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- in previous chunks. -}
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meterupdate' = offsetMeterUpdate meterupdate bytesprocessed
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storechunk ck content meterupdate = case enc of
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Nothing -> storer ck content meterupdate
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(Just (cipher, enck)) -> do
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cmd <- gpgCmd <$> Annex.getGitConfig
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withBytes content $ \b ->
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encrypt cmd encc cipher (feedBytes b) $
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readBytes $ \encb ->
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storer (enck ck) (ByteContent encb) meterupdate
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{- Check if any of the chunk keys are present. If found, seek forward
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- in the Handle, so it will be read starting at the first missing chunk.
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- Returns the ChunkKeyStream truncated to start at the first missing
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- chunk, and the number of bytes skipped due to resuming.
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-
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- As an optimisation, if the file fits into a single chunk, there's no need
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- to check if that chunk is present -- we know it's not, because otherwise
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- the whole file would be present and there would be no reason to try to
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- store it.
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-}
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seekResume
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:: Handle
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-> EncKey
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-> ChunkKeyStream
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-> CheckPresent
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-> Annex (ChunkKeyStream, BytesProcessed)
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seekResume h encryptor chunkkeys checker = do
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sz <- liftIO (hFileSize h)
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if sz <= fromMaybe 0 (fromKey keyChunkSize $ fst $ nextChunkKeyStream chunkkeys)
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then return (chunkkeys, zeroBytesProcessed)
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else check 0 chunkkeys sz
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where
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check pos cks sz
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| pos >= sz = do
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-- All chunks are already stored!
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liftIO $ hSeek h AbsoluteSeek sz
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return (cks, toBytesProcessed sz)
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| otherwise = do
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v <- tryNonAsync (checker (encryptor k))
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case v of
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Right True ->
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check pos' cks' sz
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_ -> do
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when (pos > 0) $
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liftIO $ hSeek h AbsoluteSeek pos
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return (cks, toBytesProcessed pos)
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where
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(k, cks') = nextChunkKeyStream cks
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pos' = pos + fromMaybe 0 (fromKey keyChunkSize k)
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{- Removes all chunks of a key from a remote, by calling a remover
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- action on each.
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-
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- This action may be called on a chunked key. It will simply remove it.
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-}
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removeChunks :: Remover -> UUID -> ChunkConfig -> EncKey -> Key -> Annex ()
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removeChunks remover u chunkconfig encryptor k = do
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ls <- map chunkKeyList <$> chunkKeys u chunkconfig k
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mapM_ (remover . encryptor) (concat ls)
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let chunksizes = catMaybes $ map (fromKey keyChunkSize <=< headMaybe) ls
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forM_ chunksizes $ chunksRemoved u k . FixedSizeChunks . fromIntegral
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{- Retrieves a key from a remote, using a retriever action.
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-
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- When the remote is chunked, tries each of the options returned by
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- chunkKeys until it finds one where the retriever successfully
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- gets the first chunked key.
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-
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- If retrival of one of the subsequent chunks throws an exception,
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- gives up. Note that partial data may have been written to the file
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- in this case.
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-
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- Resuming is supported when using chunks. When the destination file
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- already exists, it skips to the next chunked key that would be needed
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- to resume.
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-
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- Handles decrypting the content when encryption is used.
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-}
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retrieveChunks
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:: LensGpgEncParams encc
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=> Retriever
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-> UUID
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-> VerifyConfig
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-> ChunkConfig
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-> EncKey
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-> Key
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-> FilePath
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-> MeterUpdate
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-> Maybe (Cipher, EncKey)
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-> encc
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-> Annex Verification
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retrieveChunks retriever u vc chunkconfig encryptor basek dest basep enc encc
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| noChunks chunkconfig = do
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-- Optimisation: Try the unchunked key first, to avoid
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-- looking in the git-annex branch for chunk counts
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-- that are likely not there.
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tryNonAsync getunchunked >>= \case
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Right r -> finalize r
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Left e -> go (Just e)
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=<< chunkKeysOnly u chunkconfig basek
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| otherwise = go Nothing
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=<< chunkKeys u chunkconfig basek
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where
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go pe cks = do
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let ls = map chunkKeyList cks
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currsize <- liftIO $ catchMaybeIO $ getFileSize (toRawFilePath dest)
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let ls' = maybe ls (setupResume ls) currsize
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if any null ls'
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-- dest is already complete
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then finalize (Right Nothing)
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else finalize =<< firstavail pe currsize ls'
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firstavail Nothing _ [] = giveup "unable to determine the chunks to use for this remote"
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firstavail (Just e) _ [] = throwM e
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firstavail pe currsize ([]:ls) = firstavail pe currsize ls
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firstavail _ currsize ((k:ks):ls)
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| k == basek = getunchunked
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`catchNonAsync` (\e -> firstavail (Just e) currsize ls)
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| otherwise = do
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let offset = resumeOffset currsize k
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let p = maybe basep
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(offsetMeterUpdate basep . toBytesProcessed)
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offset
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v <- tryNonAsync $
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retriever (encryptor k) p Nothing $ \content ->
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bracket (maybe opennew openresume offset) (liftIO . hClose . fst) $ \(h, iv) -> do
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retrieved iv (Just h) p content
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let sz = toBytesProcessed $
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fromMaybe 0 $ fromKey keyChunkSize k
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getrest p h iv sz sz ks
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case v of
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Left e
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| null ls -> throwM e
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| otherwise -> firstavail (Just e) currsize ls
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Right r -> return r
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getrest _ _ iv _ _ [] = return (Right iv)
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getrest p h iv sz bytesprocessed (k:ks) = do
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let p' = offsetMeterUpdate p bytesprocessed
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liftIO $ p' zeroBytesProcessed
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retriever (encryptor k) p' Nothing $
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retrieved iv (Just h) p'
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getrest p h iv sz (addBytesProcessed bytesprocessed sz) ks
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getunchunked = do
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iv <- startVerifyKeyContentIncrementally vc basek
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case enc of
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Just _ -> do
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retriever (encryptor basek) basep Nothing $
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retrieved iv Nothing basep
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return (Right iv)
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-- Not chunked and not encrypted, so ask the
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-- retriever to incrementally verify when it
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-- retrieves to a file. It may not finish
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-- passing the whole file content to the
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-- incremental verifier though.
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Nothing -> do
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retriever (encryptor basek) basep iv $
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retrieved iv Nothing basep
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return $ case iv of
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Nothing -> Right iv
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Just iv' -> Left (IncompleteVerify iv')
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opennew = do
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iv <- startVerifyKeyContentIncrementally vc basek
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h <- liftIO $ openBinaryFile dest WriteMode
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return (h, iv)
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-- Open the file and seek to the start point in order to resume.
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openresume startpoint = do
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-- ReadWriteMode allows seeking; AppendMode does not.
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h <- liftIO $ openBinaryFile dest ReadWriteMode
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liftIO $ hSeek h AbsoluteSeek startpoint
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-- No incremental verification when resuming, since that
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-- would need to read up to the startpoint.
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let iv = Nothing
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return (h, iv)
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{- Progress meter updating is a bit tricky: If the Retriever
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- populates a file, it is responsible for updating progress
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- as the file is being retrieved.
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-
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- However, if the Retriever generates a lazy ByteString,
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- it is not responsible for updating progress (often it cannot).
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- Instead, writeRetrievedContent is passed a meter to update
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- as it consumes the ByteString.
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-}
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retrieved iv h p content =
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writeRetrievedContent dest enc encc h p' content iv
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where
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p'
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| isByteContent content = Just p
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| otherwise = Nothing
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finalize (Right Nothing) = return UnVerified
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finalize (Right (Just iv)) =
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liftIO (finalizeIncremental iv) >>= \case
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Just True -> return Verified
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_ -> return UnVerified
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finalize (Left v) = return v
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{- Writes retrieved file content to the provided Handle, decrypting it
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- first if necessary.
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-
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- If the remote did not store the content using chunks, no Handle
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- will be provided, and instead the content will be written to the
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- dest file.
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-
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- The IncrementalVerifier is updated as the file content is read.
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-
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- Note that when neither chunking nor encryption is used, and the remote
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- provides FileContent, that file only needs to be renamed
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- into place. (And it may even already be in the right place..)
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-}
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writeRetrievedContent
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:: LensGpgEncParams encc
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=> FilePath
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-> Maybe (Cipher, EncKey)
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-> encc
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-> Maybe Handle
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-> Maybe MeterUpdate
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-> ContentSource
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-> Maybe IncrementalVerifier
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-> Annex ()
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writeRetrievedContent dest enc encc mh mp content miv = case (enc, mh, content) of
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(Nothing, Nothing, FileContent f)
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| f == dest -> noop
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| otherwise -> liftIO $ moveFile f dest
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(Just (cipher, _), _, ByteContent b) -> do
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cmd <- gpgCmd <$> Annex.getGitConfig
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decrypt cmd encc cipher (feedBytes b) $
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readBytes write
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(Just (cipher, _), _, FileContent f) -> do
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cmd <- gpgCmd <$> Annex.getGitConfig
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withBytes content $ \b ->
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decrypt cmd encc cipher (feedBytes b) $
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readBytes write
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liftIO $ removeWhenExistsWith R.removeLink (toRawFilePath f)
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(Nothing, _, FileContent f) -> do
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withBytes content write
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liftIO $ removeWhenExistsWith R.removeLink (toRawFilePath f)
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(Nothing, _, ByteContent b) -> write b
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where
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write b = case mh of
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Just h -> liftIO $ write' b h
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Nothing -> liftIO $ bracket opendest hClose (write' b)
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write' b h = case mp of
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Just p ->
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let writer = case miv of
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Just iv -> \s -> do
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updateIncremental iv s
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S.hPut h s
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Nothing -> S.hPut h
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in meteredWrite p writer b
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Nothing -> L.hPut h b
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opendest = openBinaryFile dest WriteMode
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{- Can resume when the chunk's offset is at or before the end of
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- the dest file. -}
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resumeOffset :: Maybe Integer -> Key -> Maybe Integer
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resumeOffset Nothing _ = Nothing
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resumeOffset currsize k
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| offset <= currsize = offset
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| otherwise = Nothing
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where
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offset = chunkKeyOffset k
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{- Drops chunks that are already present in a file, based on its size.
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- Keeps any non-chunk keys.
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-}
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setupResume :: [[Key]] -> Integer -> [[Key]]
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setupResume ls currsize = map dropunneeded ls
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where
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dropunneeded [] = []
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dropunneeded l@(k:_) = case fromKey keyChunkSize k of
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Just chunksize | chunksize > 0 ->
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genericDrop (currsize `div` chunksize) l
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_ -> l
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{- Checks if a key is present in a remote. This requires any one
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- of the lists of options returned by chunkKeys to all check out
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- as being present using the checker action.
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-
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- Throws an exception if the remote is not accessible.
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-}
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checkPresentChunks
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:: CheckPresent
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-> UUID
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-> ChunkConfig
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-> EncKey
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-> Key
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-> Annex Bool
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checkPresentChunks checker u chunkconfig encryptor basek
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| noChunks chunkconfig = do
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-- Optimisation: Try the unchunked key first, to avoid
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-- looking in the git-annex branch for chunk counts
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-- that are likely not there.
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v <- check basek
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let getchunkkeys = chunkKeysOnly u chunkconfig basek
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case v of
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Right True -> return True
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Left e -> checklists (Just e) =<< getchunkkeys
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_ -> checklists Nothing =<< getchunkkeys
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| otherwise = checklists Nothing =<< chunkKeys u chunkconfig basek
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where
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checklists Nothing [] = return False
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checklists (Just deferrederror) [] = throwM deferrederror
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checklists d (ck:cks)
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| not (null l) = do
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v <- checkchunks l
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case v of
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Left e -> checklists (Just e) cks
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Right True -> do
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ensureChunksAreLogged u basek ck
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return True
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Right False -> checklists Nothing cks
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| otherwise = checklists d cks
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where
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l = chunkKeyList ck
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|
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checkchunks :: [Key] -> Annex (Either SomeException Bool)
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checkchunks [] = return (Right True)
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checkchunks (k:ks) = do
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v <- check k
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case v of
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Right True -> checkchunks ks
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Right False -> return $ Right False
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Left e -> return $ Left e
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check = tryNonAsync . checker . encryptor
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data ChunkKeys
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= ChunkKeys [Key]
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| SpeculativeChunkKeys (ChunkMethod, ChunkCount) [Key]
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chunkKeyList :: ChunkKeys -> [Key]
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chunkKeyList (ChunkKeys l) = l
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chunkKeyList (SpeculativeChunkKeys _ l) = l
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{- A key can be stored in a remote unchunked, or as a list of chunked keys.
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- This can be the case whether or not the remote is currently configured
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- to use chunking.
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-
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- It's even possible for a remote to have the same key stored multiple
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- times with different chunk sizes!
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-
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- This finds all possible lists of keys that might be on the remote that
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- can be combined to get back the requested key, in order from most to
|
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- least likely to exist.
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-
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- Speculatively tries chunks using the ChunkConfig last of all
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- (when that's not the same as the recorded chunks). This can help
|
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- recover from data loss, where the chunk log didn't make it out,
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- though only as long as the ChunkConfig is unchanged.
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-}
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chunkKeys :: UUID -> ChunkConfig -> Key -> Annex [ChunkKeys]
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chunkKeys = chunkKeys' False
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{- Same as chunkKeys, but excluding the unchunked key. -}
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chunkKeysOnly :: UUID -> ChunkConfig -> Key -> Annex [ChunkKeys]
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chunkKeysOnly = chunkKeys' True
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chunkKeys' :: Bool -> UUID -> ChunkConfig -> Key -> Annex [ChunkKeys]
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chunkKeys' onlychunks u chunkconfig k = do
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recorded <- getCurrentChunks u k
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let recordedl = map (ChunkKeys . toChunkList k) recorded
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return $ addspeculative recorded $ if onlychunks
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then recordedl
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else if noChunks chunkconfig
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then ChunkKeys [k] : recordedl
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else recordedl ++ [ChunkKeys [k]]
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where
|
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addspeculative recorded l = case chunkconfig of
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NoChunks -> l
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UnpaddedChunks chunksz -> case fromKey keySize k of
|
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Nothing -> l
|
|
Just keysz ->
|
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let (d, m) = keysz `divMod` fromIntegral chunksz
|
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chunkcount = d + if m == 0 then 0 else 1
|
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v = (FixedSizeChunks chunksz, chunkcount)
|
|
in if v `elem` recorded
|
|
then l
|
|
else l ++ [SpeculativeChunkKeys v (toChunkList k v)]
|
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LegacyChunks _ -> l
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|
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toChunkList :: Key -> (ChunkMethod, ChunkCount) -> [Key]
|
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toChunkList k (FixedSizeChunks chunksize, chunkcount) =
|
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takeChunkKeyStream chunkcount $ chunkKeyStream k chunksize
|
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toChunkList _ (UnknownChunks _, _) = []
|
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|
|
{- When chunkKeys provided a speculative chunk list, and that has been
|
|
- verified to be present, use this to log it in the chunk log. This way,
|
|
- a later change to the chunk size of the remote won't prevent accessing
|
|
- the chunks. -}
|
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ensureChunksAreLogged :: UUID -> Key -> ChunkKeys -> Annex ()
|
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ensureChunksAreLogged u k (SpeculativeChunkKeys (chunkmethod, chunkcount) _) =
|
|
chunksStored u k chunkmethod chunkcount
|
|
ensureChunksAreLogged _ _ (ChunkKeys _) = return ()
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|
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withBytes :: ContentSource -> (L.ByteString -> Annex a) -> Annex a
|
|
withBytes (ByteContent b) a = a b
|
|
withBytes (FileContent f) a = a =<< liftIO (L.readFile f)
|