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-rw-r--r--erebos.cabal2
-rw-r--r--src/Attach.hs7
-rw-r--r--src/Main.hs5
-rw-r--r--src/Storage.hs16
-rw-r--r--src/Storage/Internal.hs32
-rw-r--r--src/Storage/Merge.hs37
6 files changed, 86 insertions, 13 deletions
diff --git a/erebos.cabal b/erebos.cabal
index 87c3bd2..00fa1c3 100644
--- a/erebos.cabal
+++ b/erebos.cabal
@@ -59,6 +59,8 @@ executable erebos
deepseq >= 1.4 && <1.5,
directory >= 1.3 && <1.4,
filepath >=1.4 && <1.5,
+ hashable >=1.3 && <1.4,
+ hashtables >=1.2 && <1.3,
haskeline >=0.7 && <0.8,
hinotify >=0.4 && <0.5,
memory >=0.14 && <0.15,
diff --git a/src/Attach.hs b/src/Attach.hs
index 2ce6110..761da0f 100644
--- a/src/Attach.hs
+++ b/src/Attach.hs
@@ -6,14 +6,12 @@ module Attach (
import Control.Monad.Except
import Control.Monad.Reader
-import Crypto.Hash
import Crypto.Random
import Data.Bits
import Data.ByteArray (Bytes, ScrubbedBytes, convert)
import qualified Data.ByteArray as BA
import qualified Data.ByteString.Char8 as BC
-import qualified Data.ByteString.Lazy as BL
import Data.Maybe
import qualified Data.Text as T
import Data.Word
@@ -60,7 +58,7 @@ instance Storable AttachService where
skeys <- loadBinaries "skey"
(decline :: Maybe T.Text) <- loadMbText "decline"
let res = catMaybes
- [ AttachRequest <$> (digestFromByteString =<< req)
+ [ AttachRequest <$> (refDigestFromByteString =<< req)
, AttachResponse <$> rsp
, AttachRequestNonce <$> rnonce
, AttachIdentity <$> aid <*> pure skeys
@@ -183,8 +181,7 @@ attachAccept printMsg self peer = do
nonceDigest :: UnifiedIdentity -> UnifiedIdentity -> Bytes -> Bytes -> RefDigest
-nonceDigest id1 id2 nonce1 nonce2 = hashFinalize $ hashUpdates hashInit $
- BL.toChunks $ serializeObject $ Rec
+nonceDigest id1 id2 nonce1 nonce2 = hashToRefDigest $ serializeObject $ Rec
[ (BC.pack "id", RecRef $ storedRef $ idData id1)
, (BC.pack "id", RecRef $ storedRef $ idData id2)
, (BC.pack "nonce", RecBinary $ convert nonce1)
diff --git a/src/Main.hs b/src/Main.hs
index b692357..0398233 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -32,6 +32,7 @@ import PubKey
import Service
import State
import Storage
+import Storage.Merge
import Sync
main :: IO ()
@@ -69,6 +70,10 @@ main = do
Nothing -> putStrLn $ "Identity verification failed"
_ -> error $ "unknown object type '" ++ objtype ++ "'"
+ ["show-generation", sref] -> readRef st (BC.pack sref) >>= \case
+ Nothing -> error "ref does not exist"
+ Just ref -> print $ storedGeneration (wrappedLoad ref :: Stored Object)
+
["update-identity"] -> updateSharedIdentity st
("update-identity" : srefs) -> do
diff --git a/src/Storage.hs b/src/Storage.hs
index 5af34b7..5a5d992 100644
--- a/src/Storage.hs
+++ b/src/Storage.hs
@@ -6,6 +6,7 @@ module Storage (
Ref, PartialRef, RefDigest,
refStorage, refDigest,
readRef, showRef, showRefDigest,
+ refDigestFromByteString, hashToRefDigest,
copyRef, partialRef, partialRefFromDigest,
Object, PartialObject, Object'(..), RecItem, RecItem'(..),
@@ -72,6 +73,7 @@ import qualified Data.ByteString.Lazy as BL
import qualified Data.ByteString.Lazy.Char8 as BLC
import Data.Char
import Data.Function
+import qualified Data.HashTable.IO as HT
import Data.List
import qualified Data.Map as M
import Data.Maybe
@@ -105,12 +107,14 @@ openStorage path = do
createDirectoryIfMissing True $ path ++ "/objects"
createDirectoryIfMissing True $ path ++ "/heads"
watchers <- newMVar (Nothing, [])
- return $ Storage { stBacking = StorageDir path watchers, stParent = Nothing }
+ refgen <- newMVar =<< HT.new
+ return $ Storage { stBacking = StorageDir path watchers, stParent = Nothing, stRefGeneration = refgen }
memoryStorage' :: IO (Storage' c')
memoryStorage' = do
backing <- StorageMemory <$> newMVar [] <*> newMVar M.empty <*> newMVar M.empty <*> newMVar []
- return $ Storage { stBacking = backing, stParent = Nothing }
+ refgen <- newMVar =<< HT.new
+ return $ Storage { stBacking = backing, stParent = Nothing, stRefGeneration = refgen }
memoryStorage :: IO Storage
memoryStorage = memoryStorage'
@@ -129,7 +133,7 @@ type Ref = Ref' Complete
type PartialRef = Ref' Partial
zeroRef :: Storage' c -> Ref' c
-zeroRef s = Ref s h
+zeroRef s = Ref s (RefDigest h)
where h = case digestFromByteString $ B.replicate (hashDigestSize $ digestAlgo h) 0 of
Nothing -> error $ "Failed to create zero hash"
Just h' -> h'
@@ -141,7 +145,7 @@ isZeroRef (Ref _ h) = all (==0) $ BA.unpack h
readRefDigest :: ByteString -> Maybe RefDigest
-readRefDigest = digestFromByteString . B.concat <=< readHex
+readRefDigest = refDigestFromByteString . B.concat <=< readHex
where readHex bs | B.null bs = Just []
readHex bs = do (bx, bs') <- B.uncons bs
(by, bs'') <- B.uncons bs'
@@ -239,7 +243,7 @@ storeRawBytes = unsafeStoreRawBytes
unsafeStoreRawBytes :: Storage' c -> BL.ByteString -> IO (Ref' c)
unsafeStoreRawBytes st raw = do
- let dgst = hashFinalize $ hashUpdates hashInit $ BL.toChunks raw
+ let dgst = hashToRefDigest raw
case stBacking st of
StorageDir { dirPath = sdir } -> writeFileOnce (refPath sdir dgst) $ compress raw
StorageMemory { memObjs = tobjs } ->
@@ -269,7 +273,7 @@ ioLoadObject ref@(Ref st rhash) = do
file' <- ioLoadBytes ref
return $ do
file <- file'
- let chash = hashFinalize $ hashUpdates hashInit $ BL.toChunks file
+ let chash = hashToRefDigest file
when (chash /= rhash) $ error $ "Hash mismatch on object " ++ BC.unpack (showRef ref) {- TODO throw -}
return $ case runExcept $ unsafeDeserializeObject st file of
Left err -> error $ err ++ ", ref " ++ BC.unpack (showRef ref) {- TODO throw -}
diff --git a/src/Storage/Internal.hs b/src/Storage/Internal.hs
index 5f5055a..c70e8ae 100644
--- a/src/Storage/Internal.hs
+++ b/src/Storage/Internal.hs
@@ -2,28 +2,37 @@ module Storage.Internal where
import Codec.Compression.Zlib
+import Control.Arrow
import Control.Concurrent
+import Control.DeepSeq
import Control.Exception
import Control.Monad
import Control.Monad.Identity
import Crypto.Hash
+import Data.Bits
import Data.ByteArray (ByteArrayAccess, ScrubbedBytes)
import qualified Data.ByteArray as BA
import Data.ByteString (ByteString)
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as BC
import qualified Data.ByteString.Lazy as BL
+import Data.Function
+import Data.Hashable
+import qualified Data.HashTable.IO as HT
import Data.List
import Data.Map (Map)
import qualified Data.Map as M
+import Foreign.Storable (peek)
+
import System.Directory
import System.FilePath
import System.INotify (INotify)
import System.IO
import System.IO.Error
+import System.IO.Unsafe (unsafePerformIO)
import System.Posix.Files
import System.Posix.IO
import System.Posix.Types
@@ -32,8 +41,11 @@ import System.Posix.Types
data Storage' c = Storage
{ stBacking :: StorageBacking c
, stParent :: Maybe (Storage' Identity)
+ , stRefGeneration :: MVar (HT.BasicHashTable RefDigest Generation)
}
- deriving (Eq)
+
+instance Eq (Storage' c) where
+ (==) = (==) `on` (stBacking &&& stParent)
instance Show (Storage' c) where
show st@(Storage { stBacking = StorageDir { dirPath = path }}) = "dir" ++ showParentStorage st ++ ":" ++ path
@@ -55,7 +67,8 @@ data StorageBacking c
deriving (Eq)
-type RefDigest = Digest Blake2b_256
+newtype RefDigest = RefDigest (Digest Blake2b_256)
+ deriving (Eq, Ord, NFData, ByteArrayAccess)
data Ref' c = Ref (Storage' c) RefDigest
deriving (Eq)
@@ -67,6 +80,12 @@ instance ByteArrayAccess (Ref' c) where
length (Ref _ dgst) = BA.length dgst
withByteArray (Ref _ dgst) = BA.withByteArray dgst
+instance Hashable RefDigest where
+ hashWithSalt salt ref = salt `xor` unsafePerformIO (BA.withByteArray ref peek)
+
+instance Hashable (Ref' c) where
+ hashWithSalt salt ref = salt `xor` unsafePerformIO (BA.withByteArray ref peek)
+
refStorage :: Ref' c -> Storage' c
refStorage (Ref st _) = st
@@ -82,6 +101,15 @@ showRefDigest = B.concat . map showHexByte . BA.unpack
| otherwise = x + 87
showHexByte x = B.pack [ showHex (x `div` 16), showHex (x `mod` 16) ]
+refDigestFromByteString :: ByteArrayAccess ba => ba -> Maybe RefDigest
+refDigestFromByteString = fmap RefDigest . digestFromByteString
+
+hashToRefDigest :: BL.ByteString -> RefDigest
+hashToRefDigest = RefDigest . hashFinalize . hashUpdates hashInit . BL.toChunks
+
+
+newtype Generation = Generation Int
+ deriving (Eq, Show)
data Head' c = Head String (Ref' c)
deriving (Show)
diff --git a/src/Storage/Merge.hs b/src/Storage/Merge.hs
index f0eaf98..e9cb3d7 100644
--- a/src/Storage/Merge.hs
+++ b/src/Storage/Merge.hs
@@ -2,6 +2,10 @@ module Storage.Merge (
Mergeable(..),
merge, storeMerge,
+ Generation,
+ compareGeneration, generationMax,
+ storedGeneration,
+
generations,
ancestors,
precedes,
@@ -10,12 +14,17 @@ module Storage.Merge (
findProperty,
) where
+import Control.Concurrent.MVar
+
import qualified Data.ByteString.Char8 as BC
+import qualified Data.HashTable.IO as HT
import Data.List
import Data.Maybe
import Data.Set (Set)
import qualified Data.Set as S
+import System.IO.Unsafe (unsafePerformIO)
+
import Storage
import Storage.Internal
import Util
@@ -46,6 +55,34 @@ previous (Stored ref _) = case load ref of
_ -> []
+nextGeneration :: [Generation] -> Generation
+nextGeneration = foldl' helper (Generation 0)
+ where helper (Generation c) (Generation n) | c <= n = Generation (n + 1)
+ | otherwise = Generation c
+
+compareGeneration :: Generation -> Generation -> Maybe Ordering
+compareGeneration (Generation x) (Generation y) = Just $ compare x y
+
+generationMax :: Storable a => [Stored a] -> Maybe (Stored a)
+generationMax (x : xs) = Just $ snd $ foldl' helper (storedGeneration x, x) xs
+ where helper (mg, mx) y = let yg = storedGeneration y
+ in case compareGeneration mg yg of
+ Just LT -> (yg, y)
+ _ -> (mg, mx)
+generationMax [] = Nothing
+
+storedGeneration :: Storable a => Stored a -> Generation
+storedGeneration x =
+ unsafePerformIO $ withMVar (stRefGeneration $ refStorage $ storedRef x) $ \ht -> do
+ let doLookup y = HT.lookup ht (refDigest $ storedRef y) >>= \case
+ Just gen -> return gen
+ Nothing -> do
+ gen <- nextGeneration <$> mapM doLookup (previous y)
+ HT.insert ht (refDigest $ storedRef y) gen
+ return gen
+ doLookup x
+
+
generations :: Storable a => [Stored a] -> [Set (Stored a)]
generations = unfoldr gen . (,S.empty)
where gen (hs, cur) = case filter (`S.notMember` cur) $ previous =<< hs of
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 19:26:31 +0000