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{- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Types.Storage where
import Types
-- | All known locations where shards can be stored, ordered with
-- preferred locations first.
newtype StorageLocations = StorageLocations [Storage]
deriving (Monoid)
-- | Storage interface. This can be used both for local storage,
-- an upload queue, or a remote server.
--
-- Note that there is no interface to enumerate shards.
-- This is intentional; servers should not allow that.
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
, moveShards :: Storage -> IO ()
-- ^ Tries to move all shards from this storage to another one.
}
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)
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