mirror of https://github.com/voidlizard/hbs2
50 lines
1.2 KiB
Haskell
50 lines
1.2 KiB
Haskell
{-# Language FunctionalDependencies #-}
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module HBS2.Storage where
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import Data.Kind
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import Data.Hashable hiding (Hashed)
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import Prettyprinter
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import HBS2.Hash
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import HBS2.Prelude.Plated
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class Pretty (Hash h) => IsKey h where
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type Key h :: Type
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instance Key HbSync ~ Hash HbSync => IsKey HbSync where
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type instance Key HbSync = Hash HbSync
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newtype StoragePrefix = StoragePrefix { fromPrefix :: FilePath }
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deriving stock (Data,Show)
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deriving newtype (IsString)
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type family Block block :: Type
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newtype Offset = Offset Integer
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deriving newtype (Eq,Ord,Enum,Num,Real,Integral,Hashable)
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deriving stock (Show)
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newtype Size = Size Integer
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deriving newtype (Eq,Ord,Enum,Num,Real,Integral,Hashable)
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deriving stock (Show)
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class ( Monad m
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, IsKey h
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, Hashed h block
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) => Storage a h block m | a -> block, a -> h where
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putBlock :: a -> Block block -> m (Maybe (Key h))
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enqueueBlock :: a -> Block block -> m (Maybe (Key h))
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getBlock :: a -> Key h -> m (Maybe (Block block))
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getChunk :: a -> Key h -> Offset -> Size -> m (Maybe (Block block))
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hasBlock :: a -> Key h -> m Bool
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-- listBlocks :: a -> ( Key block -> m () ) -> m ()
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