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{- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module Storage where
import Types
import Shard
data Storage = Storage
{ storeShard :: StorableObjectIdent -> Shard -> IO StoreResult
, retrieveShard :: ShardNum -> StorableObjectIdent -> IO RetrieveResult
, obscureShards :: IO ObscureResult
-- ^ run after making some calls to storeShard/retrieveShard,
-- to avoid correlation attacks
, countShards :: IO CountResult
} -- Note that there is no interface to enumerate shards.
data StoreResult = StoreSuccess | StoreAlreadyExists | StoreFailure String
deriving (Show)
data RetrieveResult = RetrieveSuccess Shard | RetrieveFailure String
data ObscureResult = ObscureSuccess | ObscureFailure String
deriving (Show)
data CountResult = CountResult Integer | CountFailure String
deriving (Show)
storeShards :: Storage -> ShardIdents -> [(IO (), Shard)] -> IO StoreResult
storeShards storage sis shards = do
r <- go (zip (getIdents sis) shards)
_ <- obscureShards storage
return r
where
go [] = return StoreSuccess
go ((i,(showprogress, s)):rest) = do
r <- storeShard storage i s
_ <- showprogress
case r of
StoreSuccess -> go rest
_ -> return r
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