mirror of https://github.com/voidlizard/hbs2
27 lines
689 B
Haskell
27 lines
689 B
Haskell
{-# Language TypeFamilyDependencies #-}
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{-# Language FunctionalDependencies #-}
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module HasProtocol where
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import Data.Kind
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import Data.Proxy
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import GHC.TypeLits
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import Data.Hashable
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-- e -> Transport (like, UDP or TChan)
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-- p -> L4 Protocol (like Ping/Pong)
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class (Hashable (Peer e), Eq (Peer e)) =>HasPeer e where
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data family (Peer e) :: Type
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class (KnownNat (ProtocolId p), HasPeer e) => HasProtocol e p | p -> e where
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type family ProtocolId p = (id :: Nat) | id -> p
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type family Encoded e :: Type
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protoId :: forall . KnownNat (ProtocolId p) => Proxy p -> Integer
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protoId _ = natVal (Proxy @(ProtocolId p))
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decode :: Encoded e -> Maybe p
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encode :: p -> Encoded e
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