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module Erebos.State (
LocalState(..),
SharedState(..), SharedType(..),
SharedTypeID, mkSharedTypeID,
MonadStorage(..),
MonadHead(..),
updateLocalHead_,
LocalHeadT(..),
updateLocalState, updateLocalState_,
updateSharedState, updateSharedState_,
lookupSharedValue, makeSharedStateUpdate,
localIdentity,
headLocalIdentity,
mergeSharedIdentity,
) where
import Control.Monad
import Control.Monad.Except
import Control.Monad.Reader
import Data.Bifunctor
import Data.ByteString (ByteString)
import Data.ByteString.Char8 qualified as BC
import Data.Foldable
import Data.Map.Strict qualified as MS
import Data.Maybe
import Data.Typeable
import Erebos.Identity
import Erebos.Object
import Erebos.PubKey
import Erebos.Storable
import Erebos.Storage.Head
import Erebos.Storage.Merge
import Erebos.UUID (UUID)
import Erebos.UUID qualified as U
import Erebos.Util
data LocalState = LocalState
{ lsPrev :: Maybe RefDigest
, lsIdentity :: Stored (Signed ExtendedIdentityData)
, lsShared :: [ Stored SharedState ]
, lsOther :: [ ( ByteString, RecItem ) ]
}
data SharedState = SharedState
{ ssPrev :: [Stored SharedState]
, ssType :: Maybe SharedTypeID
, ssValue :: [Ref]
}
newtype SharedTypeID = SharedTypeID UUID
deriving (Eq, Ord, StorableUUID)
mkSharedTypeID :: String -> SharedTypeID
mkSharedTypeID = maybe (error "Invalid shared type ID") SharedTypeID . U.fromString
class Mergeable a => SharedType a where
sharedTypeID :: proxy a -> SharedTypeID
instance Storable LocalState where
store' LocalState {..} = storeRec $ do
mapM_ (storeRawWeak "PREV") lsPrev
storeRef "id" lsIdentity
mapM_ (storeRef "shared") lsShared
storeRecItems lsOther
load' = loadRec $ do
lsPrev <- loadMbRawWeak "PREV"
lsIdentity <- loadRef "id"
lsShared <- loadRefs "shared"
lsOther <- filter ((`notElem` [ BC.pack "PREV", BC.pack "id", BC.pack "shared" ]) . fst) <$> loadRecItems
return LocalState {..}
instance HeadType LocalState where
headTypeID _ = mkHeadTypeID "1d7491a9-7bcb-4eaa-8f13-c8c4c4087e4e"
type HeadCacheType LocalState = LocalStateCache
headCacheInit sls =
let LocalState {..} = fromStored sls
sharedCache = MS.fromAscList $ map (\sid -> ( sid, lookupSharedValueObjects sid [] lsShared )) $ collectSharedTypeIDs [] lsShared
in LocalStateCache lsShared sharedCache
headCacheUpdate sls prev =
let LocalState {..} = fromStored sls
sids = collectSharedTypeIDs (lscSharedTips prev) lsShared
upd cache sid = MS.insertWith (\ss ss' -> filterAncestors (ss ++ ss')) sid (lookupSharedValueObjects sid (lscSharedTips prev) lsShared) cache
in LocalStateCache lsShared (foldl' upd (lscSharedCache prev) sids)
data LocalStateCache = LocalStateCache
{ lscSharedTips :: [ Stored SharedState ]
, lscSharedCache :: MS.Map SharedTypeID (StoredTips SharedState)
}
instance Storable SharedState where
store' st = storeRec $ do
mapM_ (storeRef "PREV") $ ssPrev st
storeMbUUID "type" $ ssType st
mapM_ (storeRawRef "value") $ ssValue st
load' = loadRec $ SharedState
<$> loadRefs "PREV"
<*> loadMbUUID "type"
<*> loadRawRefs "value"
instance SharedType (Maybe ComposedIdentity) where
sharedTypeID _ = mkSharedTypeID "0c6c1fe0-f2d7-4891-926b-c332449f7871"
class (MonadIO m, MonadStorage m) => MonadHead a m where
updateLocalHead :: (Stored a -> m (Stored a, b)) -> m b
getLocalHead :: m (Stored a)
getLocalHead = updateLocalHead $ \x -> return (x, x)
updateLocalHead_ :: MonadHead a m => (Stored a -> m (Stored a)) -> m ()
updateLocalHead_ f = updateLocalHead (fmap (,()) . f)
instance (HeadType a, MonadIO m) => MonadHead a (ReaderT (Head a) m) where
updateLocalHead f = do
h <- ask
snd <$> updateHead h f
newtype LocalHeadT h m a = LocalHeadT { runLocalHeadT :: Storage -> Stored h -> m ( a, Stored h ) }
instance Functor m => Functor (LocalHeadT h m) where
fmap f (LocalHeadT act) = LocalHeadT $ \st h -> first f <$> act st h
instance Monad m => Applicative (LocalHeadT h m) where
pure x = LocalHeadT $ \_ h -> pure ( x, h )
(<*>) = ap
instance Monad m => Monad (LocalHeadT h m) where
return = pure
LocalHeadT act >>= f = LocalHeadT $ \st h -> do
( x, h' ) <- act st h
let (LocalHeadT act') = f x
act' st h'
instance MonadIO m => MonadIO (LocalHeadT h m) where
liftIO act = LocalHeadT $ \_ h -> ( , h ) <$> liftIO act
instance MonadIO m => MonadStorage (LocalHeadT h m) where
getStorage = LocalHeadT $ \st h -> return ( st, h )
instance (HeadType h, MonadIO m) => MonadHead h (LocalHeadT h m) where
updateLocalHead f = LocalHeadT $ \st h -> do
let LocalHeadT act = f h
( ( h', x ), _ ) <- act st h
return ( x, h' )
localIdentity :: LocalState -> UnifiedIdentity
localIdentity ls = maybe (error "failed to verify local identity")
(updateOwners $ maybe [] idExtDataF $ lookupSharedValue $ lsShared ls)
(validateExtendedIdentity $ lsIdentity ls)
headLocalIdentity :: Head LocalState -> UnifiedIdentity
headLocalIdentity = localIdentity . headObject
updateLocalState :: forall m b. MonadHead LocalState m => (Stored LocalState -> m ( Stored LocalState, b )) -> m b
updateLocalState f = updateLocalHead $ \ls -> do
( ls', x ) <- f ls
(, x) <$> if ls' == ls
then return ls'
else mstore (fromStored ls') { lsPrev = Just $ refDigest (storedRef ls) }
updateLocalState_ :: forall m. MonadHead LocalState m => (Stored LocalState -> m (Stored LocalState)) -> m ()
updateLocalState_ f = updateLocalState (fmap (,()) . f)
updateSharedState_ :: forall a m. (SharedType a, MonadHead LocalState m) => (a -> m a) -> Stored LocalState -> m (Stored LocalState)
updateSharedState_ f = fmap fst <$> updateSharedState (fmap (,()) . f)
updateSharedState :: forall a b m. (SharedType a, MonadHead LocalState m) => (a -> m (a, b)) -> Stored LocalState -> m (Stored LocalState, b)
updateSharedState f = \ls -> do
let shared = lsShared $ fromStored ls
val = lookupSharedValue shared
(val', x) <- f val
(,x) <$> if toComponents val' == toComponents val
then return ls
else do shared' <- makeSharedStateUpdate val' shared
mstore (fromStored ls) { lsShared = [shared'] }
collectSharedTypeIDs :: [ Stored SharedState ] -> [ Stored SharedState ] -> [ SharedTypeID ]
collectSharedTypeIDs since (x : xs)
| any (x `precedesOrEquals`) since
= collectSharedTypeIDs since xs
| otherwise
= maybeToList (ssType (fromStored x)) `mergeUniq` collectSharedTypeIDs since (ssPrev (fromStored x) ++ xs)
collectSharedTypeIDs _ [] = []
lookupSharedValueObjects :: SharedTypeID -> [ Stored SharedState ] -> [ Stored SharedState ] -> StoredTips SharedState
lookupSharedValueObjects sid since = filterAncestors . helper
where
helper (x : xs)
| any (x `precedesOrEquals`) since = helper xs
| ssType (fromStored x) == Just sid = x : helper xs
| otherwise = helper $ ssPrev (fromStored x) ++ xs
helper [] = []
lookupSharedValue :: forall a. SharedType a => [ Stored SharedState ] -> a
lookupSharedValue = mergeSorted . filterAncestors . map wrappedLoad . concatMap (ssValue . fromStored) . lookupSharedValueObjects (sharedTypeID @a Proxy) []
makeSharedStateUpdate :: forall a m. (SharedType a, MonadStorage m) => a -> [ Stored SharedState ] -> m (Stored SharedState)
makeSharedStateUpdate val prev = mstore SharedState
{ ssPrev = prev
, ssType = Just $ sharedTypeID @a Proxy
, ssValue = storedRef <$> toComponents val
}
mergeSharedIdentity :: (MonadHead LocalState m, MonadError e m, FromErebosError e) => m UnifiedIdentity
mergeSharedIdentity = updateLocalState $ updateSharedState $ \case
Just cidentity -> do
identity <- mergeIdentity cidentity
return (Just $ toComposedIdentity identity, identity)
Nothing -> throwOtherError "no existing shared identity"
|