{-# LANGUAGE ConstraintKinds #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE NoImplicitPrelude #-}
module Data.Morpheus.Server.Deriving.Channels
( channelResolver,
ChannelsConstraint,
)
where
import Control.Monad.Except (throwError)
import qualified Data.HashMap.Lazy as HM
import Data.Morpheus.App.Internal.Resolving
( Channel,
Resolver,
ResolverState,
SubscriptionField (..),
)
import Data.Morpheus.Internal.Utils
( selectBy,
)
import Data.Morpheus.Server.Deriving.Decode
( DecodeConstraint,
decodeArguments,
)
import Data.Morpheus.Server.Deriving.Utils
( ConsRep (..),
DataType (..),
FieldRep (..),
TypeConstraint (..),
TypeRep (..),
toValue,
)
import Data.Morpheus.Server.Types.GQLType (GQLType)
import Data.Morpheus.Server.Types.Types (Undefined)
import Data.Morpheus.Types.Internal.AST
( FieldName,
OUT,
SUBSCRIPTION,
Selection (..),
SelectionContent (..),
VALID,
internal,
)
import GHC.Generics
import Relude hiding (Undefined)
newtype DerivedChannel e = DerivedChannel
{ DerivedChannel e -> Channel e
_unpackChannel :: Channel e
}
type ChannelRes (e :: Type) = Selection VALID -> ResolverState (DerivedChannel e)
type ChannelsConstraint e m (subs :: (Type -> Type) -> Type) =
ExploreChannels (IsUndefined (subs (Resolver SUBSCRIPTION e m))) e (subs (Resolver SUBSCRIPTION e m))
channelResolver ::
forall e m subs.
ChannelsConstraint e m subs =>
subs (Resolver SUBSCRIPTION e m) ->
Selection VALID ->
ResolverState (Channel e)
channelResolver :: subs (Resolver SUBSCRIPTION e m)
-> Selection VALID -> ResolverState (Channel e)
channelResolver subs (Resolver SUBSCRIPTION e m)
value = (DerivedChannel e -> Channel e)
-> ResolverStateT () Identity (DerivedChannel e)
-> ResolverState (Channel e)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap DerivedChannel e -> Channel e
forall e. DerivedChannel e -> Channel e
_unpackChannel (ResolverStateT () Identity (DerivedChannel e)
-> ResolverState (Channel e))
-> (Selection VALID
-> ResolverStateT () Identity (DerivedChannel e))
-> Selection VALID
-> ResolverState (Channel e)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Selection VALID -> ResolverStateT () Identity (DerivedChannel e)
channelSelector
where
channelSelector ::
Selection VALID ->
ResolverState (DerivedChannel e)
channelSelector :: Selection VALID -> ResolverStateT () Identity (DerivedChannel e)
channelSelector =
HashMap
FieldName
(Selection VALID -> ResolverStateT () Identity (DerivedChannel e))
-> Selection VALID -> ResolverStateT () Identity (DerivedChannel e)
forall e. HashMap FieldName (ChannelRes e) -> ChannelRes e
selectBySelection
( Proxy (IsUndefined (subs (Resolver SUBSCRIPTION e m)))
-> subs (Resolver SUBSCRIPTION e m)
-> HashMap
FieldName
(Selection VALID -> ResolverStateT () Identity (DerivedChannel e))
forall (t :: Bool) e a (f :: Bool -> *).
ExploreChannels t e a =>
f t -> a -> HashMap FieldName (ChannelRes e)
exploreChannels
(Proxy (IsUndefined (subs (Resolver SUBSCRIPTION e m)))
forall k (t :: k). Proxy t
Proxy @(IsUndefined (subs (Resolver SUBSCRIPTION e m))))
subs (Resolver SUBSCRIPTION e m)
value
)
selectBySelection ::
HashMap FieldName (ChannelRes e) ->
Selection VALID ->
ResolverState (DerivedChannel e)
selectBySelection :: HashMap FieldName (ChannelRes e) -> ChannelRes e
selectBySelection HashMap FieldName (ChannelRes e)
channels = Selection VALID -> ResolverState (Selection VALID)
withSubscriptionSelection (Selection VALID -> ResolverState (Selection VALID))
-> ChannelRes e -> ChannelRes e
forall (m :: * -> *) a b c.
Monad m =>
(a -> m b) -> (b -> m c) -> a -> m c
>=> HashMap FieldName (ChannelRes e) -> ChannelRes e
forall e. HashMap FieldName (ChannelRes e) -> ChannelRes e
selectSubscription HashMap FieldName (ChannelRes e)
channels
selectSubscription ::
HashMap FieldName (ChannelRes e) ->
Selection VALID ->
ResolverState (DerivedChannel e)
selectSubscription :: HashMap FieldName (ChannelRes e) -> ChannelRes e
selectSubscription HashMap FieldName (ChannelRes e)
channels sel :: Selection VALID
sel@Selection {FieldName
selectionName :: forall (s :: Stage). Selection s -> FieldName
selectionName :: FieldName
selectionName} =
GQLError
-> FieldName
-> HashMap FieldName (ChannelRes e)
-> ResolverStateT () Identity (ChannelRes e)
forall e (m :: * -> *) k (c :: * -> *) a.
(MonadError e m, IsMap k c, Monad m) =>
e -> k -> c a -> m a
selectBy
(GQLError -> GQLError
internal GQLError
"invalid subscription: no channel is selected.")
FieldName
selectionName
HashMap FieldName (ChannelRes e)
channels
ResolverStateT () Identity (ChannelRes e)
-> (ChannelRes e -> ResolverStateT () Identity (DerivedChannel e))
-> ResolverStateT () Identity (DerivedChannel e)
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= (Selection VALID
sel Selection VALID
-> ChannelRes e -> ResolverStateT () Identity (DerivedChannel e)
forall a b. a -> (a -> b) -> b
&)
withSubscriptionSelection :: Selection VALID -> ResolverState (Selection VALID)
withSubscriptionSelection :: Selection VALID -> ResolverState (Selection VALID)
withSubscriptionSelection Selection {selectionContent :: forall (s :: Stage). Selection s -> SelectionContent s
selectionContent = SelectionSet SelectionSet VALID
selSet} =
case MergeMap 'False FieldName (Selection VALID) -> [Selection VALID]
forall (t :: * -> *) a. Foldable t => t a -> [a]
toList MergeMap 'False FieldName (Selection VALID)
SelectionSet VALID
selSet of
[Selection VALID
sel] -> Selection VALID -> ResolverState (Selection VALID)
forall (f :: * -> *) a. Applicative f => a -> f a
pure Selection VALID
sel
[Selection VALID]
_ -> GQLError -> ResolverState (Selection VALID)
forall e (m :: * -> *) a. MonadError e m => e -> m a
throwError (GQLError -> GQLError
internal GQLError
"invalid subscription: there can be only one top level selection")
withSubscriptionSelection Selection VALID
_ = GQLError -> ResolverState (Selection VALID)
forall e (m :: * -> *) a. MonadError e m => e -> m a
throwError (GQLError -> GQLError
internal GQLError
"invalid subscription: expected selectionSet")
class GetChannel e a | a -> e where
getChannel :: a -> ChannelRes e
instance GetChannel e (SubscriptionField (Resolver SUBSCRIPTION e m a)) where
getChannel :: SubscriptionField (Resolver SUBSCRIPTION e m a) -> ChannelRes e
getChannel SubscriptionField (Resolver SUBSCRIPTION e m a)
x = ResolverStateT () Identity (DerivedChannel e) -> ChannelRes e
forall a b. a -> b -> a
const (ResolverStateT () Identity (DerivedChannel e) -> ChannelRes e)
-> ResolverStateT () Identity (DerivedChannel e) -> ChannelRes e
forall a b. (a -> b) -> a -> b
$ DerivedChannel e -> ResolverStateT () Identity (DerivedChannel e)
forall (f :: * -> *) a. Applicative f => a -> f a
pure (DerivedChannel e -> ResolverStateT () Identity (DerivedChannel e))
-> DerivedChannel e
-> ResolverStateT () Identity (DerivedChannel e)
forall a b. (a -> b) -> a -> b
$ Channel e -> DerivedChannel e
forall e. Channel e -> DerivedChannel e
DerivedChannel (Channel e -> DerivedChannel e) -> Channel e -> DerivedChannel e
forall a b. (a -> b) -> a -> b
$ SubscriptionField (Resolver SUBSCRIPTION e m a)
-> forall e (m :: * -> *) v.
(Resolver SUBSCRIPTION e m a ~ Resolver SUBSCRIPTION e m v) =>
Channel e
forall a.
SubscriptionField a
-> forall e (m :: * -> *) v.
(a ~ Resolver SUBSCRIPTION e m v) =>
Channel e
channel SubscriptionField (Resolver SUBSCRIPTION e m a)
x
instance
DecodeConstraint arg =>
GetChannel e (arg -> SubscriptionField (Resolver SUBSCRIPTION e m a))
where
getChannel :: (arg -> SubscriptionField (Resolver SUBSCRIPTION e m a))
-> ChannelRes e
getChannel arg -> SubscriptionField (Resolver SUBSCRIPTION e m a)
f sel :: Selection VALID
sel@Selection {Arguments VALID
selectionArguments :: forall (s :: Stage). Selection s -> Arguments s
selectionArguments :: Arguments VALID
selectionArguments} =
Arguments VALID -> ResolverState arg
forall a. DecodeConstraint a => Arguments VALID -> ResolverState a
decodeArguments Arguments VALID
selectionArguments
ResolverState arg
-> (arg -> ResolverStateT () Identity (DerivedChannel e))
-> ResolverStateT () Identity (DerivedChannel e)
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= (SubscriptionField (Resolver SUBSCRIPTION e m a) -> ChannelRes e
forall e a. GetChannel e a => a -> ChannelRes e
`getChannel` Selection VALID
sel)
(SubscriptionField (Resolver SUBSCRIPTION e m a)
-> ResolverStateT () Identity (DerivedChannel e))
-> (arg -> SubscriptionField (Resolver SUBSCRIPTION e m a))
-> arg
-> ResolverStateT () Identity (DerivedChannel e)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. arg -> SubscriptionField (Resolver SUBSCRIPTION e m a)
f
type family IsUndefined a :: Bool where
IsUndefined (Undefined m) = 'True
IsUndefined a = 'False
class ExploreChannels (t :: Bool) e a where
exploreChannels :: f t -> a -> HashMap FieldName (ChannelRes e)
instance (GQLType a, Generic a, TypeRep (GetChannel e) (ChannelRes e) (Rep a)) => ExploreChannels 'False e a where
exploreChannels :: f 'False -> a -> HashMap FieldName (ChannelRes e)
exploreChannels f 'False
_ =
[(FieldName, ChannelRes e)] -> HashMap FieldName (ChannelRes e)
forall k v. (Eq k, Hashable k) => [(k, v)] -> HashMap k v
HM.fromList
([(FieldName, ChannelRes e)] -> HashMap FieldName (ChannelRes e))
-> (a -> [(FieldName, ChannelRes e)])
-> a
-> HashMap FieldName (ChannelRes e)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. DataType (ChannelRes e) -> [(FieldName, ChannelRes e)]
forall e. DataType (ChannelRes e) -> [(FieldName, ChannelRes e)]
convertNode
(DataType (ChannelRes e) -> [(FieldName, ChannelRes e)])
-> (a -> DataType (ChannelRes e))
-> a
-> [(FieldName, ChannelRes e)]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. TypeConstraint (GetChannel e) (ChannelRes e) Identity
-> Proxy OUT -> a -> DataType (ChannelRes e)
forall (proxy :: TypeCategory -> *) (kind :: TypeCategory)
(constraint :: * -> Constraint) value a.
(GQLType a, CategoryValue kind, Generic a,
TypeRep constraint value (Rep a)) =>
TypeConstraint constraint value Identity
-> proxy kind -> a -> DataType value
toValue
( (forall a. GetChannel e a => Identity a -> ChannelRes e)
-> TypeConstraint (GetChannel e) (ChannelRes e) Identity
forall (c :: * -> Constraint) v (f :: * -> *).
(forall a. c a => f a -> v) -> TypeConstraint c v f
TypeConstraint (a -> ChannelRes e
forall e a. GetChannel e a => a -> ChannelRes e
getChannel (a -> ChannelRes e)
-> (Identity a -> a) -> Identity a -> ChannelRes e
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Identity a -> a
forall a. Identity a -> a
runIdentity) :: TypeConstraint (GetChannel e) (ChannelRes e) Identity
)
(Proxy OUT
forall k (t :: k). Proxy t
Proxy @OUT)
instance ExploreChannels 'True e (Undefined m) where
exploreChannels :: f 'True -> Undefined m -> HashMap FieldName (ChannelRes e)
exploreChannels f 'True
_ = HashMap FieldName (ChannelRes e)
-> Undefined m -> HashMap FieldName (ChannelRes e)
forall (f :: * -> *) a. Applicative f => a -> f a
pure HashMap FieldName (ChannelRes e)
forall k v. HashMap k v
HM.empty
convertNode :: DataType (ChannelRes e) -> [(FieldName, ChannelRes e)]
convertNode :: DataType (ChannelRes e) -> [(FieldName, ChannelRes e)]
convertNode DataType {tyCons :: forall v. DataType v -> ConsRep v
tyCons = ConsRep {[FieldRep (ChannelRes e)]
consFields :: forall v. ConsRep v -> [FieldRep v]
consFields :: [FieldRep (ChannelRes e)]
consFields}} = (FieldRep (ChannelRes e) -> (FieldName, ChannelRes e))
-> [FieldRep (ChannelRes e)] -> [(FieldName, ChannelRes e)]
forall a b. (a -> b) -> [a] -> [b]
map FieldRep (ChannelRes e) -> (FieldName, ChannelRes e)
forall b. FieldRep b -> (FieldName, b)
toChannels [FieldRep (ChannelRes e)]
consFields
where
toChannels :: FieldRep b -> (FieldName, b)
toChannels FieldRep {FieldName
fieldSelector :: forall a. FieldRep a -> FieldName
fieldSelector :: FieldName
fieldSelector, b
fieldValue :: forall a. FieldRep a -> a
fieldValue :: b
fieldValue} = (FieldName
fieldSelector, b
fieldValue)