mirror of https://github.com/voidlizard/hbs2
147 lines
4.3 KiB
Haskell
147 lines
4.3 KiB
Haskell
{-# Language RankNTypes #-}
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module HBS2.Net.Proto.BlockChunks where
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import HBS2.Events
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import HBS2.Hash
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import HBS2.Net.Proto
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import HBS2.Net.Proto.Peer
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import HBS2.Prelude.Plated
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import HBS2.Storage
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import HBS2.Actors.Peer
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import HBS2.Net.Proto.Sessions
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import Data.Word
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import Data.ByteString.Lazy (ByteString)
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import Data.Maybe
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newtype ChunkSize = ChunkSize Word16
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deriving newtype (Num,Enum,Real,Integral,Pretty)
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deriving stock (Eq,Ord,Show,Data,Generic)
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newtype ChunkNum = ChunkNum Word16
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deriving newtype (Num,Enum,Real,Integral,Pretty)
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deriving stock (Eq,Ord,Show,Data,Generic)
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type OnBlockReady h m = Hash h -> m ()
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type GetBlockChunk h m = Hash h -> Offset -> Size -> m (Maybe ByteString)
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type AcceptChunk h e m = Response e (BlockChunks e) m
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=> ( Cookie e, Peer e, Hash HbSync, ChunkNum, ByteString ) -> m ()
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type GetBlockHash h e m = (Peer e, Cookie e) -> m (Maybe (Hash h))
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data BlockChunksI e m =
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BlockChunksI
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{ blkSize :: GetBlockSize HbSync m
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, blkChunk :: GetBlockChunk HbSync m
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, blkGetHash :: GetBlockHash HbSync e m
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, blkAcceptChunk :: AcceptChunk HbSync e m
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}
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data BlockChunks e = BlockChunks (Cookie e) (BlockChunksProto e)
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deriving stock (Generic, Show)
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data BlockChunksProto e = BlockGetAllChunks (Hash HbSync) ChunkSize
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| BlockGetChunks (Hash HbSync) ChunkSize Word32 Word32
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| BlockNoChunks
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| BlockChunk ChunkNum ByteString
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| BlockLost
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deriving stock (Generic, Show)
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instance HasCookie e (BlockChunks e) where
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type instance Cookie e = Word32
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getCookie (BlockChunks c _) = Just c
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instance Serialise ChunkSize
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instance Serialise ChunkNum
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instance Serialise (BlockChunksProto e)
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instance Serialise (BlockChunks e)
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newtype instance EventKey e (BlockChunks e) =
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BlockChunksEventKey (Cookie e, Hash HbSync)
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deriving stock (Typeable, Eq, Generic)
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deriving instance Hashable (EventKey e (BlockChunks e))
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data instance Event e (BlockChunks e) =
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BlockReady (Hash HbSync)
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| BlockChunksLost (Hash HbSync)
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deriving stock (Typeable)
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blockChunksProto :: forall e m proto . ( MonadIO m
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, Response e (BlockChunks e) m
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, HasDeferred (BlockChunks e) e m
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, HasOwnPeer e m
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, Sessions e (KnownPeer e) m
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, Pretty (Peer e)
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, proto ~ BlockChunks e
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)
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=> BlockChunksI e m
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-> BlockChunks e
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-> m ()
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blockChunksProto adapter (BlockChunks c p) = do
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peer <- thatPeer (Proxy @(BlockChunks e))
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auth <- find (KnownPeerKey peer) id <&> isJust
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case p of
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BlockGetChunks h size n1 num | auth -> do
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bsz' <- blkSize adapter h
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maybe1 bsz' (pure ()) $ \bsz -> do
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let offsets' = calcChunks bsz (fromIntegral size) :: [(Offset, Size)]
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let offsets = take (fromIntegral num) $ drop (fromIntegral n1) $ zip offsets' [0..]
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for_ offsets $ \((o,sz),i) -> deferred @proto do
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chunk <- blkChunk adapter h o sz
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maybe (pure ()) (response_ . BlockChunk @e i) chunk
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BlockGetAllChunks h size | auth -> do
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bsz' <- blkSize adapter h
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maybe1 bsz' (pure ()) $ \bsz -> do
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let offsets' = calcChunks bsz (fromIntegral size) :: [(Offset, Size)]
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let offsets = zip offsets' [0..]
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for_ offsets $ \((o,sz),i) -> deferred @proto do
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chunk <- blkChunk adapter h o sz
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maybe (pure ()) (response_ . BlockChunk @e i) chunk
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BlockChunk n bs | auth -> deferred @(BlockChunks e) do
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who <- thatPeer proto
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h <- blkGetHash adapter (who, c)
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maybe1 h (response_ (BlockLost @e)) $ \hh -> do
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void $ blkAcceptChunk adapter (c, who, hh, n, bs)
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BlockNoChunks {} -> do
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-- TODO: notification
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pure ()
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BlockLost{} -> do
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-- liftIO $ print "GOT BLOCK LOST MESSAGE - means IO ERROR"
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pure ()
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_ -> do
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pure ()
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where
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proto = Proxy @(BlockChunks e)
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response_ pt = response (BlockChunks c pt)
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