forked from OSS/graphql
Replace the old executor
This commit is contained in:
@@ -1,6 +1,4 @@
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{- This Source Code Form is subject to the terms of the Mozilla Public License,
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v. 2.0. If a copy of the MPL was not distributed with this file, You can
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obtain one at https://mozilla.org/MPL/2.0/. -}
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{-# LANGUAGE Safe #-}
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-- | Target AST for parser.
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module Language.GraphQL.AST
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@@ -1,3 +1,7 @@
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{- This Source Code Form is subject to the terms of the Mozilla Public License,
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v. 2.0. If a copy of the MPL was not distributed with this file, You can
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obtain one at https://mozilla.org/MPL/2.0/. -}
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{-# LANGUAGE DuplicateRecordFields #-}
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{-# LANGUAGE ExistentialQuantification #-}
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{-# LANGUAGE RecordWildCards #-}
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@@ -4,17 +4,13 @@
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE ExistentialQuantification #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ViewPatterns #-}
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{-# LANGUAGE TypeApplications #-}
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module Language.GraphQL.Execute
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( Error(..)
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, Operation(..)
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, Path(..)
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, Response(..)
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( module Language.GraphQL.Execute.Coerce
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, execute
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) where
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@@ -29,32 +25,27 @@ import Control.Monad.Catch
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, catches
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)
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import Control.Monad.Trans.Class (MonadTrans(..))
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import Control.Monad.Trans.Reader (ReaderT(..), ask, local, runReaderT)
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import Control.Monad.Trans.Writer (WriterT(..), runWriterT, tell)
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import qualified Control.Monad.Trans.Reader as Reader
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import Control.Monad.Trans.Reader (ReaderT(..), ask, runReaderT)
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import Control.Monad.Trans.Writer (WriterT(..), runWriterT)
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import qualified Control.Monad.Trans.Writer as Writer
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import Control.Monad (foldM)
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import qualified Language.GraphQL.AST.Document as Full
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import Data.Bifunctor (first)
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import Data.Foldable (find)
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import Data.Functor ((<&>))
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import Data.HashMap.Strict (HashMap)
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import qualified Data.HashMap.Strict as HashMap
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import Data.HashSet (HashSet)
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import qualified Data.HashSet as HashSet
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import Data.Int (Int32)
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import Data.List (intercalate)
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import Data.List.NonEmpty (NonEmpty(..))
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import qualified Data.List.NonEmpty as NonEmpty
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import Data.Maybe (fromMaybe, isJust)
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import Data.Sequence (Seq, (><))
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import Data.Maybe (fromMaybe)
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import Data.Sequence (Seq)
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import qualified Data.Sequence as Seq
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import Data.Text (Text)
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import qualified Data.Text as Text
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import Data.Typeable (cast)
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import GHC.Records (HasField(..))
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import qualified Language.GraphQL.Execute.Coerce as Coerce
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import Language.GraphQL.Execute.Coerce
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import Language.GraphQL.Execute.OrderedMap (OrderedMap)
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import qualified Language.GraphQL.Execute.OrderedMap as OrderedMap
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import qualified Language.GraphQL.Execute.Transform as Transform
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import qualified Language.GraphQL.Type.In as In
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import qualified Language.GraphQL.Type.Out as Out
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import qualified Language.GraphQL.Type as Type
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@@ -64,41 +55,11 @@ import qualified Language.GraphQL.Type.Schema as Schema
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import Language.GraphQL.Error
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( Error(..)
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, Response(..)
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, Path(..)
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, ResponseEventStream
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)
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import Numeric (showFloat)
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data Replacement m = Replacement
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{ variableValues :: Type.Subs
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, fragmentDefinitions :: HashMap Full.Name Full.FragmentDefinition
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, visitedFragments :: HashSet Full.Name
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, types :: HashMap Full.Name (Type m)
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}
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newtype TransformT m a = TransformT
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{ runTransformT :: ReaderT (Replacement m) m a
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}
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instance Functor m => Functor (TransformT m) where
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fmap f = TransformT . fmap f . runTransformT
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instance Applicative m => Applicative (TransformT m) where
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pure = TransformT . pure
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TransformT f <*> TransformT x = TransformT $ f <*> x
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instance Monad m => Monad (TransformT m) where
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TransformT x >>= f = TransformT $ x >>= runTransformT . f
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instance MonadTrans TransformT where
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lift = TransformT . lift
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instance MonadThrow m => MonadThrow (TransformT m) where
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throwM = lift . throwM
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instance MonadCatch m => MonadCatch (TransformT m) where
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catch (TransformT stack) handler =
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TransformT $ catch stack $ runTransformT . handler
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, Path(..)
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, ResolverException(..)
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, ResponseEventStream
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)
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import Prelude hiding (null)
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newtype ExecutorT m a = ExecutorT
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{ runExecutorT :: ReaderT (HashMap Full.Name (Type m)) (WriterT (Seq Error) m) a
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@@ -139,29 +100,31 @@ graphQLExceptionFromException e = do
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GraphQLException graphqlException <- fromException e
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cast graphqlException
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data ResolverException = forall e. Exception e => ResolverException e
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data ResultException = forall e. Exception e => ResultException e
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instance Show ResolverException where
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show (ResolverException e) = show e
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instance Show ResultException where
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show (ResultException e) = show e
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instance Exception ResolverException where
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instance Exception ResultException where
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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data FieldError
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= ResultCoercionError
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| NullResultError
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resultExceptionToException :: Exception e => e -> SomeException
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resultExceptionToException = toException . ResultException
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instance Show FieldError where
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show ResultCoercionError = "Result coercion failed."
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show NullResultError = "Non-Nullable field resolver returned Null."
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resultExceptionFromException :: Exception e => SomeException -> Maybe e
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resultExceptionFromException e = do
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ResultException resultException <- fromException e
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cast resultException
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newtype FieldException = FieldException FieldError
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deriving Show
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data FieldException = forall e. Exception e => FieldException Full.Location [Path] e
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instance Show FieldException where
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show (FieldException _ _ e) = displayException e
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instance Exception FieldException where
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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data ValueCompletionException = ValueCompletionException String Type.Value
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@@ -175,11 +138,11 @@ instance Show ValueCompletionException where
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]
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instance Exception ValueCompletionException where
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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toException = resultExceptionToException
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fromException = resultExceptionFromException
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data InputCoercionException =
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InputCoercionException String In.Type (Maybe (Full.Node Input))
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InputCoercionException String In.Type (Maybe (Full.Node Transform.Input))
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instance Show InputCoercionException where
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show (InputCoercionException argumentName argumentType Nothing) = concat
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@@ -203,14 +166,27 @@ instance Exception InputCoercionException where
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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data QueryError
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= OperationNameRequired
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| OperationNotFound String
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| CoercionError Full.VariableDefinition
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| UnknownInputType Full.VariableDefinition
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newtype ResultCoercionException = ResultCoercionException String
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asks :: Monad m => forall a. (Replacement m -> a) -> TransformT m a
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asks = TransformT . Reader.asks
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instance Show ResultCoercionException where
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show (ResultCoercionException typeRepresentation) = concat
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[ "Unable to coerce result to "
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, typeRepresentation
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, "."
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]
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instance Exception ResultCoercionException where
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toException = resultExceptionToException
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fromException = resultExceptionFromException
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data QueryError
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= OperationNameRequired
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| OperationNotFound String
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| CoercionError Full.VariableDefinition
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| UnknownInputType Full.VariableDefinition
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tell :: Monad m => Seq Error -> ExecutorT m ()
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tell = ExecutorT . lift . Writer.tell
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queryError :: QueryError -> Error
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queryError OperationNameRequired =
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@@ -241,232 +217,7 @@ queryError (UnknownInputType variableDefinition) =
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]
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in Error{ message = queryErrorMessage, locations = [location], path = [] }
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data Operation m
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= Operation Full.OperationType (Seq (Selection m)) Full.Location
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data Selection m
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= FieldSelection (Field m)
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| FragmentSelection (Fragment m)
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data Field m = Field
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(Maybe Full.Name)
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Full.Name
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(HashMap Full.Name (Full.Node Input))
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(Seq (Selection m))
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Full.Location
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data Fragment m = Fragment
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(Type.Internal.CompositeType m) (Seq (Selection m)) Full.Location
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data Input
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= Variable Type.Value
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| Int Int32
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| Float Double
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| String Text
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| Boolean Bool
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| Null
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| Enum Full.Name
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| List [Input]
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| Object (HashMap Full.Name Input)
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deriving Eq
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instance Show Input where
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showList = mappend . showList'
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where
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showList' list = "[" ++ intercalate ", " (show <$> list) ++ "]"
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show (Int integer) = show integer
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show (Float float') = showFloat float' mempty
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show (String text) = "\"" <> Text.foldr (mappend . Full.escape) "\"" text
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show (Boolean boolean') = show boolean'
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show Null = "null"
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show (Enum name) = Text.unpack name
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show (List list) = show list
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show (Object fields) = unwords
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[ "{"
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, intercalate ", " (HashMap.foldrWithKey showObject [] fields)
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, "}"
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]
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where
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showObject key value accumulator =
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concat [Text.unpack key, ": ", show value] : accumulator
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show variableValue = show variableValue
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document :: Full.Document
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-> ([Full.OperationDefinition], HashMap Full.Name Full.FragmentDefinition)
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document = foldr filterOperation ([], HashMap.empty)
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where
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filterOperation (Full.ExecutableDefinition executableDefinition) accumulator
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| Full.DefinitionOperation operationDefinition' <- executableDefinition =
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first (operationDefinition' :) accumulator
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| Full.DefinitionFragment fragmentDefinition <- executableDefinition
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, Full.FragmentDefinition fragmentName _ _ _ _ <- fragmentDefinition =
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HashMap.insert fragmentName fragmentDefinition <$> accumulator
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filterOperation _ accumulator = accumulator -- Type system definitions.
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transform :: Monad m => Full.OperationDefinition -> TransformT m (Operation m)
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transform (Full.OperationDefinition operationType _ _ _ selectionSet' operationLocation) = do
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transformedSelections <- selectionSet selectionSet'
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pure $ Operation operationType transformedSelections operationLocation
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transform (Full.SelectionSet selectionSet' operationLocation) = do
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transformedSelections <- selectionSet selectionSet'
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pure $ Operation Full.Query transformedSelections operationLocation
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selectionSet :: Monad m => Full.SelectionSet -> TransformT m (Seq (Selection m))
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selectionSet = selectionSetOpt . NonEmpty.toList
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selectionSetOpt :: Monad m => Full.SelectionSetOpt -> TransformT m (Seq (Selection m))
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selectionSetOpt = foldM go Seq.empty
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where
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go accumulatedSelections currentSelection =
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selection currentSelection <&> (accumulatedSelections ><)
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selection :: Monad m => Full.Selection -> TransformT m (Seq (Selection m))
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selection (Full.FieldSelection field') =
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maybeToSelectionSet FieldSelection $ field field'
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selection (Full.FragmentSpreadSelection fragmentSpread') =
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maybeToSelectionSet FragmentSelection $ fragmentSpread fragmentSpread'
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selection (Full.InlineFragmentSelection inlineFragment') =
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either id (pure . FragmentSelection) <$> inlineFragment inlineFragment'
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maybeToSelectionSet :: Monad m
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=> forall a
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. (a -> Selection m)
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-> TransformT m (Maybe a)
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-> TransformT m (Seq (Selection m))
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maybeToSelectionSet selectionType = fmap (maybe Seq.empty $ pure . selectionType)
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directives :: Monad m => [Full.Directive] -> TransformT m (Maybe [Type.Directive])
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directives = fmap Type.selection . traverse directive
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inlineFragment :: Monad m
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=> Full.InlineFragment
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-> TransformT m (Either (Seq (Selection m)) (Fragment m))
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inlineFragment (Full.InlineFragment maybeCondition directives' selectionSet' location)
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| Just typeCondition <- maybeCondition = do
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transformedSelections <- selectionSet selectionSet'
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transformedDirectives <- directives directives'
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maybeFragmentType <- asks
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$ Type.Internal.lookupTypeCondition typeCondition
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. types
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pure $ case transformedDirectives >> maybeFragmentType of
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Just fragmentType -> Right
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$ Fragment fragmentType transformedSelections location
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Nothing -> Left Seq.empty
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| otherwise = do
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transformedSelections <- selectionSet selectionSet'
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transformedDirectives <- directives directives'
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pure $ if isJust transformedDirectives
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then Left transformedSelections
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else Left Seq.empty
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fragmentSpread :: Monad m => Full.FragmentSpread -> TransformT m (Maybe (Fragment m))
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fragmentSpread (Full.FragmentSpread spreadName directives' location) = do
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transformedDirectives <- directives directives'
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visitedFragment <- asks $ HashSet.member spreadName . visitedFragments
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possibleFragmentDefinition <- asks
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$ HashMap.lookup spreadName
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. fragmentDefinitions
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case transformedDirectives >> possibleFragmentDefinition of
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Just (Full.FragmentDefinition _ typeCondition _ selections _)
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| visitedFragment -> pure Nothing
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| otherwise -> do
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fragmentType <- asks
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$ Type.Internal.lookupTypeCondition typeCondition
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. types
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traverse (traverseSelections selections) fragmentType
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Nothing -> pure Nothing
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where
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traverseSelections selections typeCondition = do
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transformedSelections <- TransformT
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$ local fragmentInserter
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$ runTransformT
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$ selectionSet selections
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pure $ Fragment typeCondition transformedSelections location
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fragmentInserter replacement@Replacement{ visitedFragments } = replacement
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{ visitedFragments = HashSet.insert spreadName visitedFragments }
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field :: Monad m => Full.Field -> TransformT m (Maybe (Field m))
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field (Full.Field alias' name' arguments' directives' selectionSet' location') = do
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transformedSelections <- selectionSetOpt selectionSet'
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transformedDirectives <- directives directives'
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transformedArguments <- arguments arguments'
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let transformedField = Field
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alias'
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name'
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transformedArguments
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transformedSelections
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location'
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pure $ transformedDirectives >> pure transformedField
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arguments :: Monad m => [Full.Argument] -> TransformT m (HashMap Full.Name (Full.Node Input))
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arguments = foldM go HashMap.empty
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where
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go accumulator (Full.Argument name' valueNode argumentLocation) = do
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let replaceLocation = flip Full.Node argumentLocation . Full.node
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argumentValue <- fmap replaceLocation <$> node valueNode
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pure $ insertIfGiven name' argumentValue accumulator
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directive :: Monad m => Full.Directive -> TransformT m Type.Directive
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directive (Full.Directive name' arguments' _)
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= Type.Directive name'
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. Type.Arguments
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<$> foldM go HashMap.empty arguments'
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where
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go accumulator (Full.Argument argumentName Full.Node{ node = node' } _) = do
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transformedValue <- directiveValue node'
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pure $ HashMap.insert argumentName transformedValue accumulator
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directiveValue :: Monad m => Full.Value -> TransformT m Type.Value
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directiveValue = \case
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(Full.Variable name') -> asks
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$ HashMap.lookupDefault Type.Null name'
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. variableValues
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(Full.Int integer) -> pure $ Type.Int integer
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(Full.Float double) -> pure $ Type.Float double
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(Full.String string) -> pure $ Type.String string
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(Full.Boolean boolean) -> pure $ Type.Boolean boolean
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Full.Null -> pure Type.Null
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(Full.Enum enum) -> pure $ Type.Enum enum
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(Full.List list) -> Type.List <$> traverse directiveNode list
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(Full.Object objectFields) ->
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Type.Object <$> foldM objectField HashMap.empty objectFields
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where
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directiveNode Full.Node{ node = node'} = directiveValue node'
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objectField accumulator Full.ObjectField{ name, value } = do
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transformedValue <- directiveNode value
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pure $ HashMap.insert name transformedValue accumulator
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input :: Monad m => Full.Value -> TransformT m (Maybe Input)
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input (Full.Variable name') =
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asks (HashMap.lookup name' . variableValues) <&> fmap Variable
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input (Full.Int integer) = pure $ Just $ Int integer
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input (Full.Float double) = pure $ Just $ Float double
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input (Full.String string) = pure $ Just $ String string
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input (Full.Boolean boolean) = pure $ Just $ Boolean boolean
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input Full.Null = pure $ Just Null
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input (Full.Enum enum) = pure $ Just $ Enum enum
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input (Full.List list) = Just . List
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<$> traverse (fmap (fromMaybe Null) . input . Full.node) list
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input (Full.Object objectFields) = Just . Object
|
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<$> foldM objectField HashMap.empty objectFields
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where
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objectField accumulator Full.ObjectField{..} = do
|
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objectFieldValue <- fmap Full.node <$> node value
|
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pure $ insertIfGiven name objectFieldValue accumulator
|
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|
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insertIfGiven :: forall a
|
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. Full.Name
|
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-> Maybe a
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-> HashMap Full.Name a
|
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-> HashMap Full.Name a
|
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insertIfGiven name (Just v) = HashMap.insert name v
|
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insertIfGiven _ _ = id
|
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node :: Monad m => Full.Node Full.Value -> TransformT m (Maybe (Full.Node Input))
|
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node Full.Node{node = node', ..} =
|
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traverse Full.Node <$> input node' <*> pure location
|
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|
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execute :: (MonadCatch m, Coerce.VariableValue a, Coerce.Serialize b)
|
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execute :: (MonadCatch m, VariableValue a, Serialize b)
|
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=> Schema m -- ^ Resolvers.
|
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-> Maybe Text -- ^ Operation name.
|
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-> HashMap Full.Name a -- ^ Variable substitution function.
|
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@@ -475,7 +226,7 @@ execute :: (MonadCatch m, Coerce.VariableValue a, Coerce.Serialize b)
|
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execute schema' operationName subs document' =
|
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executeRequest schema' document' (Text.unpack <$> operationName) subs
|
||||
|
||||
executeRequest :: (MonadCatch m, Coerce.Serialize a, Coerce.VariableValue b)
|
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executeRequest :: (MonadCatch m, Serialize a, VariableValue b)
|
||||
=> Schema m
|
||||
-> Full.Document
|
||||
-> Maybe String
|
||||
@@ -486,35 +237,36 @@ executeRequest schema sourceDocument operationName variableValues = do
|
||||
case operationAndVariables of
|
||||
Left queryError' -> pure
|
||||
$ Right
|
||||
$ Response Coerce.null $ pure $ queryError queryError'
|
||||
$ Response null $ pure $ queryError queryError'
|
||||
Right operation
|
||||
| Operation Full.Query topSelections _operationLocation <- operation ->
|
||||
| Transform.Operation Full.Query topSelections _operationLocation <- operation ->
|
||||
Right <$> executeQuery topSelections schema
|
||||
| Operation Full.Mutation topSelections operationLocation <- operation ->
|
||||
| Transform.Operation Full.Mutation topSelections operationLocation <- operation ->
|
||||
Right <$> executeMutation topSelections schema operationLocation
|
||||
| Operation Full.Subscription topSelections operationLocation <- operation ->
|
||||
| Transform.Operation Full.Subscription topSelections operationLocation <- operation ->
|
||||
either rightErrorResponse Left <$> subscribe topSelections schema operationLocation
|
||||
where
|
||||
schemaTypes = Schema.types schema
|
||||
(operationDefinitions, fragmentDefinitions') = document sourceDocument
|
||||
(operationDefinitions, fragmentDefinitions') =
|
||||
Transform.document sourceDocument
|
||||
buildOperation = do
|
||||
operationDefinition <- getOperation operationDefinitions operationName
|
||||
coercedVariableValues <- coerceVariableValues
|
||||
schemaTypes
|
||||
operationDefinition
|
||||
variableValues
|
||||
let replacement = Replacement
|
||||
let replacement = Transform.Replacement
|
||||
{ variableValues = coercedVariableValues
|
||||
, fragmentDefinitions = fragmentDefinitions'
|
||||
, visitedFragments = mempty
|
||||
, types = schemaTypes
|
||||
}
|
||||
pure $ flip runReaderT replacement
|
||||
$ runTransformT
|
||||
$ transform operationDefinition
|
||||
$ Transform.runTransformT
|
||||
$ Transform.transform operationDefinition
|
||||
|
||||
rightErrorResponse :: Coerce.Serialize b => forall a. Error -> Either a (Response b)
|
||||
rightErrorResponse = Right . Response Coerce.null . pure
|
||||
rightErrorResponse :: Serialize b => forall a. Error -> Either a (Response b)
|
||||
rightErrorResponse = Right . Response null . pure
|
||||
|
||||
getOperation :: [Full.OperationDefinition] -> Maybe String -> Either QueryError Full.OperationDefinition
|
||||
getOperation [operation] Nothing = Right operation
|
||||
@@ -527,8 +279,8 @@ getOperation operations (Just givenOperationName)
|
||||
findOperationByName _ = False
|
||||
getOperation _ _ = Left OperationNameRequired
|
||||
|
||||
executeQuery :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
executeQuery :: (MonadCatch m, Serialize a)
|
||||
=> Seq (Transform.Selection m)
|
||||
-> Schema m
|
||||
-> m (Response a)
|
||||
executeQuery topSelections schema = do
|
||||
@@ -536,11 +288,26 @@ executeQuery topSelections schema = do
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT (Schema.types schema)
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet topSelections queryType Type.Null []
|
||||
$ catch (executeSelectionSet topSelections queryType Type.Null [])
|
||||
handleException
|
||||
pure $ Response data' errors
|
||||
|
||||
executeMutation :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
handleException :: (MonadCatch m, Serialize a)
|
||||
=> FieldException
|
||||
-> ExecutorT m a
|
||||
handleException (FieldException fieldLocation errorPath next) =
|
||||
let newError = constructError next fieldLocation errorPath
|
||||
in tell (Seq.singleton newError) >> pure null
|
||||
|
||||
constructError :: Exception e => e -> Full.Location -> [Path] -> Error
|
||||
constructError e fieldLocation errorPath = Error
|
||||
{ message = Text.pack (displayException e)
|
||||
, path = reverse errorPath
|
||||
, locations = [fieldLocation]
|
||||
}
|
||||
|
||||
executeMutation :: (MonadCatch m, Serialize a)
|
||||
=> Seq (Transform.Selection m)
|
||||
-> Schema m
|
||||
-> Full.Location
|
||||
-> m (Response a)
|
||||
@@ -549,15 +316,16 @@ executeMutation topSelections schema operationLocation
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT (Schema.types schema)
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet topSelections mutationType Type.Null []
|
||||
$ catch (executeSelectionSet topSelections mutationType Type.Null [])
|
||||
handleException
|
||||
pure $ Response data' errors
|
||||
| otherwise = pure
|
||||
$ Response Coerce.null
|
||||
$ Response null
|
||||
$ Seq.singleton
|
||||
$ Error "Schema doesn't support mutations." [operationLocation] []
|
||||
|
||||
executeSelectionSet :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
executeSelectionSet :: (MonadCatch m, Serialize a)
|
||||
=> Seq (Transform.Selection m)
|
||||
-> Out.ObjectType m
|
||||
-> Type.Value
|
||||
-> [Path]
|
||||
@@ -565,62 +333,80 @@ executeSelectionSet :: (MonadCatch m, Coerce.Serialize a)
|
||||
executeSelectionSet selections objectType objectValue errorPath = do
|
||||
let groupedFieldSet = collectFields objectType selections
|
||||
resolvedValues <- OrderedMap.traverseMaybe go groupedFieldSet
|
||||
coerceResult (Out.NonNullObjectType objectType) $ Coerce.Object resolvedValues
|
||||
coerceResult (Out.NonNullObjectType objectType) $ Object resolvedValues
|
||||
where
|
||||
executeField' fields resolver =
|
||||
executeField objectValue fields resolver errorPath
|
||||
Out.ObjectType _ _ _ resolvers = objectType
|
||||
go fields@(Field _ fieldName _ _ _ :| _) =
|
||||
go fields@(Transform.Field _ fieldName _ _ _ :| _) =
|
||||
traverse (executeField' fields) $ HashMap.lookup fieldName resolvers
|
||||
|
||||
fieldsSegment :: forall m. NonEmpty (Field m) -> Path
|
||||
fieldsSegment (Field alias fieldName _ _ _ :| _) =
|
||||
fieldsSegment :: forall m. NonEmpty (Transform.Field m) -> Path
|
||||
fieldsSegment (Transform.Field alias fieldName _ _ _ :| _) =
|
||||
Segment (fromMaybe fieldName alias)
|
||||
|
||||
executeField :: (MonadCatch m, Coerce.Serialize a)
|
||||
viewResolver :: Out.Resolver m -> (Out.Field m, Out.Resolve m)
|
||||
viewResolver (Out.ValueResolver resolverField' resolveFunction) =
|
||||
(resolverField', resolveFunction)
|
||||
viewResolver (Out.EventStreamResolver resolverField' resolveFunction _) =
|
||||
(resolverField', resolveFunction)
|
||||
|
||||
executeField :: forall m a
|
||||
. (MonadCatch m, Serialize a)
|
||||
=> Type.Value
|
||||
-> NonEmpty (Field m)
|
||||
-> NonEmpty (Transform.Field m)
|
||||
-> Out.Resolver m
|
||||
-> [Path]
|
||||
-> ExecutorT m a
|
||||
executeField objectValue fields resolver errorPath =
|
||||
let Field _ fieldName inputArguments _ fieldLocation :| _ = fields
|
||||
executeField objectValue fields (viewResolver -> resolverPair) errorPath =
|
||||
let Transform.Field _ fieldName inputArguments _ fieldLocation :| _ = fields
|
||||
in catches (go fieldName inputArguments)
|
||||
[ Handler (inputCoercionHandler fieldLocation)
|
||||
, Handler (graphqlExceptionHandler fieldLocation)
|
||||
[ Handler nullResultHandler
|
||||
, Handler (inputCoercionHandler fieldLocation)
|
||||
, Handler (resultHandler fieldLocation)
|
||||
, Handler (resolverHandler fieldLocation)
|
||||
]
|
||||
where
|
||||
inputCoercionHandler :: (MonadCatch m, Coerce.Serialize a)
|
||||
inputCoercionHandler :: (MonadCatch m, Serialize a)
|
||||
=> Full.Location
|
||||
-> InputCoercionException
|
||||
-> ExecutorT m a
|
||||
inputCoercionHandler _ e@(InputCoercionException _ _ (Just valueNode)) =
|
||||
let argumentLocation = getField @"location" valueNode
|
||||
in exceptionHandler argumentLocation $ displayException e
|
||||
inputCoercionHandler fieldLocation e =
|
||||
exceptionHandler fieldLocation $ displayException e
|
||||
graphqlExceptionHandler :: (MonadCatch m, Coerce.Serialize a)
|
||||
in exceptionHandler argumentLocation e
|
||||
inputCoercionHandler fieldLocation e = exceptionHandler fieldLocation e
|
||||
resultHandler :: (MonadCatch m, Serialize a)
|
||||
=> Full.Location
|
||||
-> GraphQLException
|
||||
-> ResultException
|
||||
-> ExecutorT m a
|
||||
graphqlExceptionHandler fieldLocation e =
|
||||
exceptionHandler fieldLocation $ displayException e
|
||||
exceptionHandler errorLocation exceptionText =
|
||||
let newError = Error (Text.pack exceptionText) [errorLocation]
|
||||
$ reverse
|
||||
$ fieldsSegment fields : errorPath
|
||||
in ExecutorT (lift $ tell $ Seq.singleton newError) >> pure Coerce.null
|
||||
resultHandler = exceptionHandler
|
||||
resolverHandler :: (MonadCatch m, Serialize a)
|
||||
=> Full.Location
|
||||
-> ResolverException
|
||||
-> ExecutorT m a
|
||||
resolverHandler = exceptionHandler
|
||||
nullResultHandler :: (MonadCatch m, Serialize a)
|
||||
=> FieldException
|
||||
-> ExecutorT m a
|
||||
nullResultHandler e@(FieldException fieldLocation errorPath' next) =
|
||||
let newError = constructError next fieldLocation errorPath'
|
||||
in if Out.isNonNullType fieldType
|
||||
then throwM e
|
||||
else returnError newError
|
||||
exceptionHandler errorLocation e =
|
||||
let newPath = fieldsSegment fields : errorPath
|
||||
newError = constructError e errorLocation newPath
|
||||
in if Out.isNonNullType fieldType
|
||||
then throwM $ FieldException errorLocation newPath e
|
||||
else returnError newError
|
||||
returnError newError = tell (Seq.singleton newError) >> pure null
|
||||
go fieldName inputArguments = do
|
||||
let (Out.Field _ fieldType argumentTypes, resolveFunction) =
|
||||
resolverField resolver
|
||||
argumentValues <- coerceArgumentValues argumentTypes inputArguments
|
||||
resolvedValue <-
|
||||
resolveFieldValue resolveFunction objectValue fieldName argumentValues
|
||||
resolveFieldValue resolveFunction objectValue fieldName argumentValues
|
||||
completeValue fieldType fields errorPath resolvedValue
|
||||
resolverField (Out.ValueResolver resolverField' resolveFunction) =
|
||||
(resolverField', resolveFunction)
|
||||
resolverField (Out.EventStreamResolver resolverField' resolveFunction _) =
|
||||
(resolverField', resolveFunction)
|
||||
(resolverField, resolveFunction) = resolverPair
|
||||
Out.Field _ fieldType argumentTypes = resolverField
|
||||
|
||||
resolveFieldValue :: MonadCatch m
|
||||
=> Out.Resolve m
|
||||
@@ -651,34 +437,33 @@ resolveAbstractType abstractType values'
|
||||
_ -> pure Nothing
|
||||
| otherwise = pure Nothing
|
||||
|
||||
completeValue :: (MonadCatch m, Coerce.Serialize a)
|
||||
completeValue :: (MonadCatch m, Serialize a)
|
||||
=> Out.Type m
|
||||
-> NonEmpty (Field m)
|
||||
-> NonEmpty (Transform.Field m)
|
||||
-> [Path]
|
||||
-> Type.Value
|
||||
-> ExecutorT m a
|
||||
completeValue outputType _ _ Type.Null
|
||||
| Out.isNonNullType outputType = throwFieldError NullResultError
|
||||
| otherwise = pure Coerce.null
|
||||
completeValue (Out.isNonNullType -> False) _ _ Type.Null =
|
||||
pure null
|
||||
completeValue outputType@(Out.ListBaseType listType) fields errorPath (Type.List list)
|
||||
= foldM go (0, []) list >>= coerceResult outputType . Coerce.List . snd
|
||||
= foldM go (0, []) list >>= coerceResult outputType . List . snd
|
||||
where
|
||||
go (index, accumulator) listItem = do
|
||||
let updatedPath = Index index : errorPath
|
||||
completedValue <- completeValue listType fields updatedPath listItem
|
||||
pure (index + 1, completedValue : accumulator)
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Int int) =
|
||||
coerceResult outputType $ Coerce.Int int
|
||||
coerceResult outputType $ Int int
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Boolean boolean) =
|
||||
coerceResult outputType $ Coerce.Boolean boolean
|
||||
coerceResult outputType $ Boolean boolean
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Float float) =
|
||||
coerceResult outputType $ Coerce.Float float
|
||||
coerceResult outputType $ Float float
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.String string) =
|
||||
coerceResult outputType $ Coerce.String string
|
||||
coerceResult outputType $ String string
|
||||
completeValue outputType@(Out.EnumBaseType enumType) _ _ (Type.Enum enum) =
|
||||
let Type.EnumType _ _ enumMembers = enumType
|
||||
in if HashMap.member enum enumMembers
|
||||
then coerceResult outputType $ Coerce.Enum enum
|
||||
then coerceResult outputType $ Enum enum
|
||||
else throwM
|
||||
$ ValueCompletionException (show outputType)
|
||||
$ Type.Enum enum
|
||||
@@ -708,28 +493,25 @@ completeValue outputType@(Out.UnionBaseType unionType) fields errorPath result
|
||||
completeValue outputType _ _ result =
|
||||
throwM $ ValueCompletionException (show outputType) result
|
||||
|
||||
coerceResult :: (MonadCatch m, Coerce.Serialize a)
|
||||
coerceResult :: (MonadCatch m, Serialize a)
|
||||
=> Out.Type m
|
||||
-> Coerce.Output a
|
||||
-> Output a
|
||||
-> ExecutorT m a
|
||||
coerceResult outputType result
|
||||
| Just serialized <- Coerce.serialize outputType result = pure serialized
|
||||
| otherwise = throwFieldError ResultCoercionError
|
||||
| Just serialized <- serialize outputType result = pure serialized
|
||||
| otherwise = throwM $ ResultCoercionException $ show outputType
|
||||
|
||||
mergeSelectionSets :: MonadCatch m
|
||||
=> NonEmpty (Field m)
|
||||
-> Seq (Selection m)
|
||||
=> NonEmpty (Transform.Field m)
|
||||
-> Seq (Transform.Selection m)
|
||||
mergeSelectionSets = foldr forEach mempty
|
||||
where
|
||||
forEach (Field _ _ _ fieldSelectionSet _) selectionSet' =
|
||||
forEach (Transform.Field _ _ _ fieldSelectionSet _) selectionSet' =
|
||||
selectionSet' <> fieldSelectionSet
|
||||
|
||||
throwFieldError :: MonadCatch m => FieldError -> m a
|
||||
throwFieldError = throwM . FieldException
|
||||
|
||||
coerceArgumentValues :: MonadCatch m
|
||||
=> HashMap Full.Name In.Argument
|
||||
-> HashMap Full.Name (Full.Node Input)
|
||||
-> HashMap Full.Name (Full.Node Transform.Input)
|
||||
-> m Type.Subs
|
||||
coerceArgumentValues argumentDefinitions argumentValues =
|
||||
HashMap.foldrWithKey c pure argumentDefinitions mempty
|
||||
@@ -754,53 +536,53 @@ coerceArgumentValues argumentDefinitions argumentValues =
|
||||
$ Just inputValue
|
||||
| otherwise -> throwM
|
||||
$ InputCoercionException (Text.unpack argumentName) variableType Nothing
|
||||
matchFieldValues' = Coerce.matchFieldValues coerceArgumentValue
|
||||
matchFieldValues' = matchFieldValues coerceArgumentValue
|
||||
$ Full.node <$> argumentValues
|
||||
coerceArgumentValue inputType (Int integer) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Int integer)
|
||||
coerceArgumentValue inputType (Boolean boolean) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Boolean boolean)
|
||||
coerceArgumentValue inputType (String string) =
|
||||
Coerce.coerceInputLiteral inputType (Type.String string)
|
||||
coerceArgumentValue inputType (Float float) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Float float)
|
||||
coerceArgumentValue inputType (Enum enum) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Enum enum)
|
||||
coerceArgumentValue inputType Null
|
||||
coerceArgumentValue inputType (Transform.Int integer) =
|
||||
coerceInputLiteral inputType (Type.Int integer)
|
||||
coerceArgumentValue inputType (Transform.Boolean boolean) =
|
||||
coerceInputLiteral inputType (Type.Boolean boolean)
|
||||
coerceArgumentValue inputType (Transform.String string) =
|
||||
coerceInputLiteral inputType (Type.String string)
|
||||
coerceArgumentValue inputType (Transform.Float float) =
|
||||
coerceInputLiteral inputType (Type.Float float)
|
||||
coerceArgumentValue inputType (Transform.Enum enum) =
|
||||
coerceInputLiteral inputType (Type.Enum enum)
|
||||
coerceArgumentValue inputType Transform.Null
|
||||
| In.isNonNullType inputType = Nothing
|
||||
| otherwise = Coerce.coerceInputLiteral inputType Type.Null
|
||||
coerceArgumentValue (In.ListBaseType inputType) (List list) =
|
||||
| otherwise = coerceInputLiteral inputType Type.Null
|
||||
coerceArgumentValue (In.ListBaseType inputType) (Transform.List list) =
|
||||
let coerceItem = coerceArgumentValue inputType
|
||||
in Type.List <$> traverse coerceItem list
|
||||
coerceArgumentValue (In.InputObjectBaseType inputType) (Object object)
|
||||
coerceArgumentValue (In.InputObjectBaseType inputType) (Transform.Object object)
|
||||
| In.InputObjectType _ _ inputFields <- inputType =
|
||||
let go = forEachField object
|
||||
resultMap = HashMap.foldrWithKey go (pure mempty) inputFields
|
||||
in Type.Object <$> resultMap
|
||||
coerceArgumentValue _ (Variable variable) = pure variable
|
||||
coerceArgumentValue _ (Transform.Variable variable) = pure variable
|
||||
coerceArgumentValue _ _ = Nothing
|
||||
forEachField object variableName (In.InputField _ variableType defaultValue) =
|
||||
Coerce.matchFieldValues coerceArgumentValue object variableName variableType defaultValue
|
||||
matchFieldValues coerceArgumentValue object variableName variableType defaultValue
|
||||
|
||||
collectFields :: Monad m
|
||||
=> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> OrderedMap (NonEmpty (Field m))
|
||||
-> Seq (Transform.Selection m)
|
||||
-> OrderedMap (NonEmpty (Transform.Field m))
|
||||
collectFields objectType = foldl forEach OrderedMap.empty
|
||||
where
|
||||
forEach groupedFields (FieldSelection fieldSelection) =
|
||||
let Field maybeAlias fieldName _ _ _ = fieldSelection
|
||||
forEach groupedFields (Transform.FieldSelection fieldSelection) =
|
||||
let Transform.Field maybeAlias fieldName _ _ _ = fieldSelection
|
||||
responseKey = fromMaybe fieldName maybeAlias
|
||||
in OrderedMap.insert responseKey (fieldSelection :| []) groupedFields
|
||||
forEach groupedFields (FragmentSelection selectionFragment)
|
||||
| Fragment fragmentType fragmentSelectionSet _ <- selectionFragment
|
||||
forEach groupedFields (Transform.FragmentSelection selectionFragment)
|
||||
| Transform.Fragment fragmentType fragmentSelectionSet _ <- selectionFragment
|
||||
, Type.Internal.doesFragmentTypeApply fragmentType objectType =
|
||||
let fragmentGroupedFieldSet =
|
||||
collectFields objectType fragmentSelectionSet
|
||||
in groupedFields <> fragmentGroupedFieldSet
|
||||
| otherwise = groupedFields
|
||||
|
||||
coerceVariableValues :: (Monad m, Coerce.VariableValue b)
|
||||
coerceVariableValues :: (Monad m, VariableValue b)
|
||||
=> HashMap Full.Name (Schema.Type m)
|
||||
-> Full.OperationDefinition
|
||||
-> HashMap Full.Name b
|
||||
@@ -818,7 +600,7 @@ coerceVariableValues types operationDefinition' variableValues
|
||||
in case Type.Internal.lookupInputType variableTypeName types of
|
||||
Just variableType ->
|
||||
maybe (Left $ CoercionError variableDefinition) Right
|
||||
$ Coerce.matchFieldValues
|
||||
$ matchFieldValues
|
||||
coerceVariableValue'
|
||||
variableValues
|
||||
variableName
|
||||
@@ -828,8 +610,8 @@ coerceVariableValues types operationDefinition' variableValues
|
||||
Nothing -> Left $ UnknownInputType variableDefinition
|
||||
forEach _ coercedValuesOrError = coercedValuesOrError
|
||||
coerceVariableValue' variableType value'
|
||||
= Coerce.coerceVariableValue variableType value'
|
||||
>>= Coerce.coerceInputLiteral variableType
|
||||
= coerceVariableValue variableType value'
|
||||
>>= coerceInputLiteral variableType
|
||||
|
||||
constValue :: Full.ConstValue -> Type.Value
|
||||
constValue (Full.ConstInt i) = Type.Int i
|
||||
@@ -845,8 +627,8 @@ constValue (Full.ConstObject o) =
|
||||
constObjectField Full.ObjectField{value = value', ..} =
|
||||
(name, constValue $ Full.node value')
|
||||
|
||||
subscribe :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
subscribe :: (MonadCatch m, Serialize a)
|
||||
=> Seq (Transform.Selection m)
|
||||
-> Schema m
|
||||
-> Full.Location
|
||||
-> m (Either Error (ResponseEventStream m a))
|
||||
@@ -861,10 +643,10 @@ subscribe fields schema objectLocation
|
||||
| otherwise = pure $ Left
|
||||
$ Error "Schema doesn't support subscriptions." [] []
|
||||
|
||||
mapSourceToResponseEvent :: (MonadCatch m, Coerce.Serialize a)
|
||||
mapSourceToResponseEvent :: (MonadCatch m, Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> Seq (Transform.Selection m)
|
||||
-> Out.SourceEventStream m
|
||||
-> m (ResponseEventStream m a)
|
||||
mapSourceToResponseEvent types' subscriptionType fields sourceStream
|
||||
@@ -876,11 +658,12 @@ createSourceEventStream :: MonadCatch m
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Selection m)
|
||||
-> Seq (Transform.Selection m)
|
||||
-> m (Either Error (Out.SourceEventStream m))
|
||||
createSourceEventStream _types subscriptionType objectLocation fields
|
||||
| [fieldGroup] <- OrderedMap.elems groupedFieldSet
|
||||
, Field _ fieldName arguments' _ errorLocation <- NonEmpty.head fieldGroup
|
||||
, Transform.Field _ fieldName arguments' _ errorLocation <-
|
||||
NonEmpty.head fieldGroup
|
||||
, Out.ObjectType _ _ _ fieldTypes <- subscriptionType
|
||||
, resolverT <- fieldTypes HashMap.! fieldName
|
||||
, Out.EventStreamResolver fieldDefinition _ resolver <- resolverT
|
||||
@@ -889,16 +672,15 @@ createSourceEventStream _types subscriptionType objectLocation fields
|
||||
Left _ -> pure
|
||||
$ Left
|
||||
$ Error "Argument coercion failed." [errorLocation] []
|
||||
Right argumentValues -> left (singleError' [errorLocation])
|
||||
Right argumentValues -> left (singleError [errorLocation])
|
||||
<$> resolveFieldEventStream Type.Null argumentValues resolver
|
||||
| otherwise = pure
|
||||
$ Left
|
||||
$ Error "Subscription contains more than one field." [objectLocation] []
|
||||
where
|
||||
groupedFieldSet = collectFields subscriptionType fields
|
||||
|
||||
singleError' :: [Full.Location] -> String -> Error
|
||||
singleError' errorLocations message = Error (Text.pack message) errorLocations []
|
||||
singleError :: [Full.Location] -> String -> Error
|
||||
singleError errorLocations message = Error (Text.pack message) errorLocations []
|
||||
|
||||
resolveFieldEventStream :: MonadCatch m
|
||||
=> Type.Value
|
||||
@@ -917,15 +699,16 @@ resolveFieldEventStream result args resolver =
|
||||
, Type.values = result
|
||||
}
|
||||
|
||||
executeSubscriptionEvent :: (MonadCatch m, Coerce.Serialize a)
|
||||
executeSubscriptionEvent :: (MonadCatch m, Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> Seq (Transform.Selection m)
|
||||
-> Type.Value
|
||||
-> m (Response a)
|
||||
executeSubscriptionEvent types' objectType fields initialValue = do
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT types'
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet fields objectType initialValue []
|
||||
$ catch (executeSelectionSet fields objectType initialValue [])
|
||||
handleException
|
||||
pure $ Response data' errors
|
||||
|
||||
@@ -1,253 +0,0 @@
|
||||
{-# LANGUAGE ExplicitForAll #-}
|
||||
{-# LANGUAGE LambdaCase #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE ViewPatterns #-}
|
||||
|
||||
module Language.GraphQL.Execute.Execution
|
||||
( coerceArgumentValues
|
||||
, collectFields
|
||||
, executeSelectionSet
|
||||
) where
|
||||
|
||||
import Control.Monad.Catch (Exception(..), MonadCatch(..))
|
||||
import Control.Monad.Trans.Class (lift)
|
||||
import Control.Monad.Trans.Reader (runReaderT)
|
||||
import Control.Monad.Trans.State (gets)
|
||||
import Data.List.NonEmpty (NonEmpty(..))
|
||||
import qualified Data.List.NonEmpty as NonEmpty
|
||||
import Data.HashMap.Strict (HashMap)
|
||||
import qualified Data.HashMap.Strict as HashMap
|
||||
import Data.Maybe (fromMaybe)
|
||||
import Data.Sequence (Seq(..))
|
||||
import qualified Data.Text as Text
|
||||
import qualified Language.GraphQL.AST as Full
|
||||
import Language.GraphQL.Error
|
||||
import Language.GraphQL.Execute.Coerce
|
||||
import Language.GraphQL.Execute.Internal
|
||||
import Language.GraphQL.Execute.OrderedMap (OrderedMap)
|
||||
import qualified Language.GraphQL.Execute.OrderedMap as OrderedMap
|
||||
import qualified Language.GraphQL.Execute.Transform as Transform
|
||||
import qualified Language.GraphQL.Type as Type
|
||||
import qualified Language.GraphQL.Type.In as In
|
||||
import qualified Language.GraphQL.Type.Out as Out
|
||||
import qualified Language.GraphQL.Type.Internal as Internal
|
||||
import Prelude hiding (null)
|
||||
|
||||
resolveFieldValue :: MonadCatch m
|
||||
=> Type.Value
|
||||
-> Type.Subs
|
||||
-> Type.Resolve m
|
||||
-> Full.Location
|
||||
-> CollectErrsT m Type.Value
|
||||
resolveFieldValue result args resolver location' =
|
||||
catch (lift $ runReaderT resolver context) handleFieldError
|
||||
where
|
||||
handleFieldError :: MonadCatch m
|
||||
=> ResolverException
|
||||
-> CollectErrsT m Type.Value
|
||||
handleFieldError e
|
||||
= addError Type.Null
|
||||
$ Error (Text.pack $ displayException e) [location'] []
|
||||
context = Type.Context
|
||||
{ Type.arguments = Type.Arguments args
|
||||
, Type.values = result
|
||||
}
|
||||
|
||||
collectFields :: Monad m
|
||||
=> Out.ObjectType m
|
||||
-> Seq (Transform.Selection m)
|
||||
-> OrderedMap (NonEmpty (Transform.Field m))
|
||||
collectFields objectType = foldl forEach OrderedMap.empty
|
||||
where
|
||||
forEach groupedFields (Transform.SelectionField field) =
|
||||
let responseKey = aliasOrName field
|
||||
in OrderedMap.insert responseKey (field :| []) groupedFields
|
||||
forEach groupedFields (Transform.SelectionFragment selectionFragment)
|
||||
| Transform.Fragment fragmentType fragmentSelectionSet <- selectionFragment
|
||||
, Internal.doesFragmentTypeApply fragmentType objectType =
|
||||
let fragmentGroupedFieldSet = collectFields objectType fragmentSelectionSet
|
||||
in groupedFields <> fragmentGroupedFieldSet
|
||||
| otherwise = groupedFields
|
||||
|
||||
aliasOrName :: forall m. Transform.Field m -> Full.Name
|
||||
aliasOrName (Transform.Field alias name _ _ _) = fromMaybe name alias
|
||||
|
||||
resolveAbstractType :: Monad m
|
||||
=> Internal.AbstractType m
|
||||
-> Type.Subs
|
||||
-> CollectErrsT m (Maybe (Out.ObjectType m))
|
||||
resolveAbstractType abstractType values'
|
||||
| Just (Type.String typeName) <- HashMap.lookup "__typename" values' = do
|
||||
types' <- gets types
|
||||
case HashMap.lookup typeName types' of
|
||||
Just (Internal.ObjectType objectType) ->
|
||||
if Internal.instanceOf objectType abstractType
|
||||
then pure $ Just objectType
|
||||
else pure Nothing
|
||||
_ -> pure Nothing
|
||||
| otherwise = pure Nothing
|
||||
|
||||
executeField :: (MonadCatch m, Serialize a)
|
||||
=> Out.Resolver m
|
||||
-> Type.Value
|
||||
-> NonEmpty (Transform.Field m)
|
||||
-> CollectErrsT m a
|
||||
executeField fieldResolver prev fields
|
||||
| Out.ValueResolver fieldDefinition resolver <- fieldResolver =
|
||||
executeField' fieldDefinition resolver
|
||||
| Out.EventStreamResolver fieldDefinition resolver _ <- fieldResolver =
|
||||
executeField' fieldDefinition resolver
|
||||
where
|
||||
executeField' fieldDefinition resolver = do
|
||||
let Out.Field _ fieldType argumentDefinitions = fieldDefinition
|
||||
let Transform.Field _ _ arguments' _ location' = NonEmpty.head fields
|
||||
case coerceArgumentValues argumentDefinitions arguments' of
|
||||
Left [] ->
|
||||
let errorMessage = "Not all required arguments are specified."
|
||||
in addError null $ Error errorMessage [location'] []
|
||||
Left errorLocations -> addError null
|
||||
$ Error "Argument coercing failed." errorLocations []
|
||||
Right argumentValues -> do
|
||||
answer <- resolveFieldValue prev argumentValues resolver location'
|
||||
completeValue fieldType fields answer
|
||||
|
||||
completeValue :: (MonadCatch m, Serialize a)
|
||||
=> Out.Type m
|
||||
-> NonEmpty (Transform.Field m)
|
||||
-> Type.Value
|
||||
-> CollectErrsT m a
|
||||
completeValue (Out.isNonNullType -> False) _ Type.Null = pure null
|
||||
completeValue outputType@(Out.ListBaseType listType) fields (Type.List list)
|
||||
= traverse (completeValue listType fields) list
|
||||
>>= coerceResult outputType (firstFieldLocation fields) . List
|
||||
completeValue outputType@(Out.ScalarBaseType _) fields (Type.Int int) =
|
||||
coerceResult outputType (firstFieldLocation fields) $ Int int
|
||||
completeValue outputType@(Out.ScalarBaseType _) fields (Type.Boolean boolean) =
|
||||
coerceResult outputType (firstFieldLocation fields) $ Boolean boolean
|
||||
completeValue outputType@(Out.ScalarBaseType _) fields (Type.Float float) =
|
||||
coerceResult outputType (firstFieldLocation fields) $ Float float
|
||||
completeValue outputType@(Out.ScalarBaseType _) fields (Type.String string) =
|
||||
coerceResult outputType (firstFieldLocation fields) $ String string
|
||||
completeValue outputType@(Out.EnumBaseType enumType) fields (Type.Enum enum) =
|
||||
let Type.EnumType _ _ enumMembers = enumType
|
||||
location = firstFieldLocation fields
|
||||
in if HashMap.member enum enumMembers
|
||||
then coerceResult outputType location $ Enum enum
|
||||
else addError null $ Error "Enum value completion failed." [location] []
|
||||
completeValue (Out.ObjectBaseType objectType) fields result
|
||||
= executeSelectionSet result objectType (firstFieldLocation fields)
|
||||
$ mergeSelectionSets fields
|
||||
completeValue (Out.InterfaceBaseType interfaceType) fields result
|
||||
| Type.Object objectMap <- result = do
|
||||
let abstractType = Internal.AbstractInterfaceType interfaceType
|
||||
let location = firstFieldLocation fields
|
||||
concreteType <- resolveAbstractType abstractType objectMap
|
||||
case concreteType of
|
||||
Just objectType -> executeSelectionSet result objectType location
|
||||
$ mergeSelectionSets fields
|
||||
Nothing -> addError null
|
||||
$ Error "Interface value completion failed." [location] []
|
||||
completeValue (Out.UnionBaseType unionType) fields result
|
||||
| Type.Object objectMap <- result = do
|
||||
let abstractType = Internal.AbstractUnionType unionType
|
||||
let location = firstFieldLocation fields
|
||||
concreteType <- resolveAbstractType abstractType objectMap
|
||||
case concreteType of
|
||||
Just objectType -> executeSelectionSet result objectType
|
||||
location $ mergeSelectionSets fields
|
||||
Nothing -> addError null
|
||||
$ Error "Union value completion failed." [location] []
|
||||
completeValue _ (Transform.Field _ _ _ _ location :| _) _ =
|
||||
addError null $ Error "Value completion failed." [location] []
|
||||
|
||||
mergeSelectionSets :: MonadCatch m
|
||||
=> NonEmpty (Transform.Field m)
|
||||
-> Seq (Transform.Selection m)
|
||||
mergeSelectionSets = foldr forEach mempty
|
||||
where
|
||||
forEach (Transform.Field _ _ _ fieldSelectionSet _) selectionSet =
|
||||
selectionSet <> fieldSelectionSet
|
||||
|
||||
firstFieldLocation :: MonadCatch m => NonEmpty (Transform.Field m) -> Full.Location
|
||||
firstFieldLocation (Transform.Field _ _ _ _ fieldLocation :| _) = fieldLocation
|
||||
|
||||
coerceResult :: (MonadCatch m, Serialize a)
|
||||
=> Out.Type m
|
||||
-> Full.Location
|
||||
-> Output a
|
||||
-> CollectErrsT m a
|
||||
coerceResult outputType parentLocation result
|
||||
| Just serialized <- serialize outputType result = pure serialized
|
||||
| otherwise = addError null
|
||||
$ Error "Result coercion failed." [parentLocation] []
|
||||
|
||||
-- | Takes an 'Out.ObjectType' and a list of 'Transform.Selection's and applies
|
||||
-- each field to each 'Transform.Selection'. Resolves into a value containing
|
||||
-- the resolved 'Transform.Selection', or a null value and error information.
|
||||
executeSelectionSet :: (MonadCatch m, Serialize a)
|
||||
=> Type.Value
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Transform.Selection m)
|
||||
-> CollectErrsT m a
|
||||
executeSelectionSet result objectType@(Out.ObjectType _ _ _ resolvers) objectLocation selectionSet = do
|
||||
let fields = collectFields objectType selectionSet
|
||||
resolvedValues <- OrderedMap.traverseMaybe forEach fields
|
||||
coerceResult (Out.NonNullObjectType objectType) objectLocation
|
||||
$ Object resolvedValues
|
||||
where
|
||||
forEach fields@(field :| _) =
|
||||
let Transform.Field _ name _ _ _ = field
|
||||
in traverse (tryResolver fields) $ lookupResolver name
|
||||
lookupResolver = flip HashMap.lookup resolvers
|
||||
tryResolver fields resolver =
|
||||
executeField resolver result fields >>= lift . pure
|
||||
|
||||
coerceArgumentValues
|
||||
:: HashMap Full.Name In.Argument
|
||||
-> HashMap Full.Name (Full.Node Transform.Input)
|
||||
-> Either [Full.Location] Type.Subs
|
||||
coerceArgumentValues argumentDefinitions argumentNodes =
|
||||
HashMap.foldrWithKey forEach (pure mempty) argumentDefinitions
|
||||
where
|
||||
forEach argumentName (In.Argument _ variableType defaultValue) = \case
|
||||
Right resultMap
|
||||
| Just matchedValues
|
||||
<- matchFieldValues' argumentName variableType defaultValue $ Just resultMap
|
||||
-> Right matchedValues
|
||||
| otherwise -> Left $ generateError argumentName []
|
||||
Left errorLocations
|
||||
| Just _
|
||||
<- matchFieldValues' argumentName variableType defaultValue $ pure mempty
|
||||
-> Left errorLocations
|
||||
| otherwise -> Left $ generateError argumentName errorLocations
|
||||
generateError argumentName errorLocations =
|
||||
case HashMap.lookup argumentName argumentNodes of
|
||||
Just (Full.Node _ errorLocation) -> [errorLocation]
|
||||
Nothing -> errorLocations
|
||||
matchFieldValues' = matchFieldValues coerceArgumentValue (Full.node <$> argumentNodes)
|
||||
coerceArgumentValue inputType (Transform.Int integer) =
|
||||
coerceInputLiteral inputType (Type.Int integer)
|
||||
coerceArgumentValue inputType (Transform.Boolean boolean) =
|
||||
coerceInputLiteral inputType (Type.Boolean boolean)
|
||||
coerceArgumentValue inputType (Transform.String string) =
|
||||
coerceInputLiteral inputType (Type.String string)
|
||||
coerceArgumentValue inputType (Transform.Float float) =
|
||||
coerceInputLiteral inputType (Type.Float float)
|
||||
coerceArgumentValue inputType (Transform.Enum enum) =
|
||||
coerceInputLiteral inputType (Type.Enum enum)
|
||||
coerceArgumentValue inputType Transform.Null
|
||||
| In.isNonNullType inputType = Nothing
|
||||
| otherwise = coerceInputLiteral inputType Type.Null
|
||||
coerceArgumentValue (In.ListBaseType inputType) (Transform.List list) =
|
||||
let coerceItem = coerceInputLiteral inputType
|
||||
in Type.List <$> traverse coerceItem list
|
||||
coerceArgumentValue (In.InputObjectBaseType inputType) (Transform.Object object)
|
||||
| In.InputObjectType _ _ inputFields <- inputType =
|
||||
let go = forEachField object
|
||||
resultMap = HashMap.foldrWithKey go (pure mempty) inputFields
|
||||
in Type.Object <$> resultMap
|
||||
coerceArgumentValue _ (Transform.Variable variable) = pure variable
|
||||
coerceArgumentValue _ _ = Nothing
|
||||
forEachField object variableName (In.InputField _ variableType defaultValue) =
|
||||
matchFieldValues coerceArgumentValue object variableName variableType defaultValue
|
||||
@@ -1,113 +0,0 @@
|
||||
{- This Source Code Form is subject to the terms of the Mozilla Public License,
|
||||
v. 2.0. If a copy of the MPL was not distributed with this file, You can
|
||||
obtain one at https://mozilla.org/MPL/2.0/. -}
|
||||
|
||||
{-# LANGUAGE ExplicitForAll #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
module Language.GraphQL.Execute.Subscribe
|
||||
( subscribe
|
||||
) where
|
||||
|
||||
import Conduit
|
||||
import Control.Arrow (left)
|
||||
import Control.Monad.Catch (Exception(..), MonadCatch(..))
|
||||
import Control.Monad.Trans.Reader (ReaderT(..), runReaderT)
|
||||
import Data.HashMap.Strict (HashMap)
|
||||
import qualified Data.HashMap.Strict as HashMap
|
||||
import qualified Data.List.NonEmpty as NonEmpty
|
||||
import Data.Sequence (Seq(..))
|
||||
import qualified Language.GraphQL.AST as Full
|
||||
import Language.GraphQL.Execute.Coerce
|
||||
import Language.GraphQL.Execute.Execution
|
||||
import Language.GraphQL.Execute.Internal
|
||||
import qualified Language.GraphQL.Execute.OrderedMap as OrderedMap
|
||||
import qualified Language.GraphQL.Execute.Transform as Transform
|
||||
import Language.GraphQL.Error
|
||||
( Error(..)
|
||||
, ResolverException
|
||||
, Response
|
||||
, ResponseEventStream
|
||||
, runCollectErrs
|
||||
)
|
||||
import qualified Language.GraphQL.Type.Definition as Definition
|
||||
import qualified Language.GraphQL.Type as Type
|
||||
import qualified Language.GraphQL.Type.Out as Out
|
||||
import Language.GraphQL.Type.Schema
|
||||
|
||||
subscribe :: (MonadCatch m, Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Transform.Selection m)
|
||||
-> m (Either Error (ResponseEventStream m a))
|
||||
subscribe types' objectType objectLocation fields = do
|
||||
sourceStream <-
|
||||
createSourceEventStream types' objectType objectLocation fields
|
||||
let traverser =
|
||||
mapSourceToResponseEvent types' objectType objectLocation fields
|
||||
traverse traverser sourceStream
|
||||
|
||||
mapSourceToResponseEvent :: (MonadCatch m, Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Transform.Selection m)
|
||||
-> Out.SourceEventStream m
|
||||
-> m (ResponseEventStream m a)
|
||||
mapSourceToResponseEvent types' subscriptionType objectLocation fields sourceStream
|
||||
= pure
|
||||
$ sourceStream
|
||||
.| mapMC (executeSubscriptionEvent types' subscriptionType objectLocation fields)
|
||||
|
||||
createSourceEventStream :: MonadCatch m
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Transform.Selection m)
|
||||
-> m (Either Error (Out.SourceEventStream m))
|
||||
createSourceEventStream _types subscriptionType objectLocation fields
|
||||
| [fieldGroup] <- OrderedMap.elems groupedFieldSet
|
||||
, Transform.Field _ fieldName arguments' _ errorLocation <- NonEmpty.head fieldGroup
|
||||
, Out.ObjectType _ _ _ fieldTypes <- subscriptionType
|
||||
, resolverT <- fieldTypes HashMap.! fieldName
|
||||
, Out.EventStreamResolver fieldDefinition _ resolver <- resolverT
|
||||
, Out.Field _ _fieldType argumentDefinitions <- fieldDefinition =
|
||||
case coerceArgumentValues argumentDefinitions arguments' of
|
||||
Left _ -> pure
|
||||
$ Left
|
||||
$ Error "Argument coercion failed." [errorLocation] []
|
||||
Right argumentValues -> left (singleError [errorLocation])
|
||||
<$> resolveFieldEventStream Type.Null argumentValues resolver
|
||||
| otherwise = pure
|
||||
$ Left
|
||||
$ Error "Subscription contains more than one field." [objectLocation] []
|
||||
where
|
||||
groupedFieldSet = collectFields subscriptionType fields
|
||||
|
||||
resolveFieldEventStream :: MonadCatch m
|
||||
=> Type.Value
|
||||
-> Type.Subs
|
||||
-> Out.Subscribe m
|
||||
-> m (Either String (Out.SourceEventStream m))
|
||||
resolveFieldEventStream result args resolver =
|
||||
catch (Right <$> runReaderT resolver context) handleEventStreamError
|
||||
where
|
||||
handleEventStreamError :: MonadCatch m
|
||||
=> ResolverException
|
||||
-> m (Either String (Out.SourceEventStream m))
|
||||
handleEventStreamError = pure . Left . displayException
|
||||
context = Type.Context
|
||||
{ Type.arguments = Type.Arguments args
|
||||
, Type.values = result
|
||||
}
|
||||
|
||||
executeSubscriptionEvent :: (MonadCatch m, Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Transform.Selection m)
|
||||
-> Definition.Value
|
||||
-> m (Response a)
|
||||
executeSubscriptionEvent types' objectType objectLocation fields initialValue
|
||||
= runCollectErrs types'
|
||||
$ executeSelectionSet initialValue objectType objectLocation fields
|
||||
@@ -6,7 +6,7 @@
|
||||
{-# LANGUAGE LambdaCase #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE RecordWildCards #-}
|
||||
{-# LANGUAGE TupleSections #-}
|
||||
{-# LANGUAGE NamedFieldPuns #-}
|
||||
|
||||
-- | After the document is parsed, before getting executed, the AST is
|
||||
-- transformed into a similar, simpler AST. Performed transformations include:
|
||||
@@ -21,65 +21,84 @@
|
||||
-- This module is also responsible for smaller rewrites that touch only parts of
|
||||
-- the original AST.
|
||||
module Language.GraphQL.Execute.Transform
|
||||
( Document(..)
|
||||
, Field(..)
|
||||
( Field(..)
|
||||
, Fragment(..)
|
||||
, Input(..)
|
||||
, Operation(..)
|
||||
, QueryError(..)
|
||||
, Replacement(..)
|
||||
, Selection(..)
|
||||
, TransformT(..)
|
||||
, document
|
||||
, transform
|
||||
) where
|
||||
|
||||
import Control.Monad (foldM, unless)
|
||||
import Control.Monad.Trans.Class (lift)
|
||||
import Control.Monad.Trans.State (State, evalStateT, gets, modify)
|
||||
import Data.Foldable (find)
|
||||
import Data.Functor.Identity (Identity(..))
|
||||
import Control.Monad (foldM)
|
||||
import Control.Monad.Catch (MonadCatch(..), MonadThrow(..))
|
||||
import Control.Monad.Trans.Class (MonadTrans(..))
|
||||
import Control.Monad.Trans.Reader (ReaderT(..), local)
|
||||
import qualified Control.Monad.Trans.Reader as Reader
|
||||
import Data.Bifunctor (first)
|
||||
import Data.Functor ((<&>))
|
||||
import Data.HashMap.Strict (HashMap)
|
||||
import qualified Data.HashMap.Strict as HashMap
|
||||
import Data.HashSet (HashSet)
|
||||
import qualified Data.HashSet as HashSet
|
||||
import Data.Int (Int32)
|
||||
import Data.Maybe (fromMaybe)
|
||||
import Data.List.NonEmpty (NonEmpty(..))
|
||||
import Data.List (intercalate)
|
||||
import qualified Data.List.NonEmpty as NonEmpty
|
||||
import Data.Sequence (Seq, (<|), (><))
|
||||
import Data.Maybe (fromMaybe, isJust)
|
||||
import Data.Sequence (Seq, (><))
|
||||
import qualified Data.Sequence as Seq
|
||||
import Data.Text (Text)
|
||||
import qualified Data.Text as Text
|
||||
import qualified Language.GraphQL.AST as Full
|
||||
import Language.GraphQL.AST (Name)
|
||||
import qualified Language.GraphQL.Execute.Coerce as Coerce
|
||||
import qualified Language.GraphQL.Type.Definition as Definition
|
||||
import qualified Language.GraphQL.AST.Document as Full
|
||||
import Language.GraphQL.Type.Schema (Type)
|
||||
import qualified Language.GraphQL.Type as Type
|
||||
import qualified Language.GraphQL.Type.Definition as Definition
|
||||
import qualified Language.GraphQL.Type.Internal as Type
|
||||
import qualified Language.GraphQL.Type.Out as Out
|
||||
import qualified Language.GraphQL.Type.Schema as Schema
|
||||
import Numeric (showFloat)
|
||||
|
||||
-- | Associates a fragment name with a list of 'Field's.
|
||||
data Replacement m = Replacement
|
||||
{ fragments :: HashMap Full.Name (Fragment m)
|
||||
, fragmentDefinitions :: FragmentDefinitions
|
||||
, variableValues :: Type.Subs
|
||||
, types :: HashMap Full.Name (Schema.Type m)
|
||||
{ variableValues :: Type.Subs
|
||||
, fragmentDefinitions :: HashMap Full.Name Full.FragmentDefinition
|
||||
, visitedFragments :: HashSet Full.Name
|
||||
, types :: HashMap Full.Name (Type m)
|
||||
}
|
||||
|
||||
type FragmentDefinitions = HashMap Full.Name Full.FragmentDefinition
|
||||
newtype TransformT m a = TransformT
|
||||
{ runTransformT :: ReaderT (Replacement m) m a
|
||||
}
|
||||
|
||||
-- | Represents fragments and inline fragments.
|
||||
data Fragment m
|
||||
= Fragment (Type.CompositeType m) (Seq (Selection m))
|
||||
instance Functor m => Functor (TransformT m) where
|
||||
fmap f = TransformT . fmap f . runTransformT
|
||||
|
||||
-- | Single selection element.
|
||||
data Selection m
|
||||
= SelectionFragment (Fragment m)
|
||||
| SelectionField (Field m)
|
||||
instance Applicative m => Applicative (TransformT m) where
|
||||
pure = TransformT . pure
|
||||
TransformT f <*> TransformT x = TransformT $ f <*> x
|
||||
|
||||
instance Monad m => Monad (TransformT m) where
|
||||
TransformT x >>= f = TransformT $ x >>= runTransformT . f
|
||||
|
||||
instance MonadTrans TransformT where
|
||||
lift = TransformT . lift
|
||||
|
||||
instance MonadThrow m => MonadThrow (TransformT m) where
|
||||
throwM = lift . throwM
|
||||
|
||||
instance MonadCatch m => MonadCatch (TransformT m) where
|
||||
catch (TransformT stack) handler =
|
||||
TransformT $ catch stack $ runTransformT . handler
|
||||
|
||||
asks :: Monad m => forall a. (Replacement m -> a) -> TransformT m a
|
||||
asks = TransformT . Reader.asks
|
||||
|
||||
-- | GraphQL has 3 operation types: queries, mutations and subscribtions.
|
||||
data Operation m
|
||||
= Query (Maybe Text) (Seq (Selection m)) Full.Location
|
||||
| Mutation (Maybe Text) (Seq (Selection m)) Full.Location
|
||||
| Subscription (Maybe Text) (Seq (Selection m)) Full.Location
|
||||
= Operation Full.OperationType (Seq (Selection m)) Full.Location
|
||||
|
||||
data Selection m
|
||||
= FieldSelection (Field m)
|
||||
| FragmentSelection (Fragment m)
|
||||
|
||||
-- | Single GraphQL field.
|
||||
data Field m = Field
|
||||
(Maybe Full.Name)
|
||||
Full.Name
|
||||
@@ -87,339 +106,214 @@ data Field m = Field
|
||||
(Seq (Selection m))
|
||||
Full.Location
|
||||
|
||||
-- | Contains the operation to be executed along with its root type.
|
||||
data Document m = Document
|
||||
(HashMap Full.Name (Schema.Type m)) (Out.ObjectType m) (Operation m)
|
||||
|
||||
data OperationDefinition = OperationDefinition
|
||||
Full.OperationType
|
||||
(Maybe Full.Name)
|
||||
[Full.VariableDefinition]
|
||||
[Full.Directive]
|
||||
Full.SelectionSet
|
||||
Full.Location
|
||||
|
||||
-- | Query error types.
|
||||
data QueryError
|
||||
= OperationNotFound Text
|
||||
| OperationNameRequired
|
||||
| CoercionError
|
||||
| EmptyDocument
|
||||
| UnsupportedRootOperation
|
||||
|
||||
instance Show QueryError where
|
||||
show (OperationNotFound operationName) = unwords
|
||||
["Operation", Text.unpack operationName, "couldn't be found in the document."]
|
||||
show OperationNameRequired = "Missing operation name."
|
||||
show CoercionError = "Coercion error."
|
||||
show EmptyDocument =
|
||||
"The document doesn't contain any executable operations."
|
||||
show UnsupportedRootOperation =
|
||||
"Root operation type couldn't be found in the schema."
|
||||
data Fragment m = Fragment
|
||||
(Type.CompositeType m) (Seq (Selection m)) Full.Location
|
||||
|
||||
data Input
|
||||
= Int Int32
|
||||
= Variable Type.Value
|
||||
| Int Int32
|
||||
| Float Double
|
||||
| String Text
|
||||
| Boolean Bool
|
||||
| Null
|
||||
| Enum Name
|
||||
| List [Type.Value]
|
||||
| Object (HashMap Name Input)
|
||||
| Variable Type.Value
|
||||
deriving (Eq, Show)
|
||||
| Enum Full.Name
|
||||
| List [Input]
|
||||
| Object (HashMap Full.Name Input)
|
||||
deriving Eq
|
||||
|
||||
getOperation
|
||||
:: Maybe Full.Name
|
||||
-> NonEmpty OperationDefinition
|
||||
-> Either QueryError OperationDefinition
|
||||
getOperation Nothing (operation' :| []) = pure operation'
|
||||
getOperation Nothing _ = Left OperationNameRequired
|
||||
getOperation (Just operationName) operations
|
||||
| Just operation' <- find matchingName operations = pure operation'
|
||||
| otherwise = Left $ OperationNotFound operationName
|
||||
instance Show Input where
|
||||
showList = mappend . showList'
|
||||
where
|
||||
showList' list = "[" ++ intercalate ", " (show <$> list) ++ "]"
|
||||
show (Int integer) = show integer
|
||||
show (Float float') = showFloat float' mempty
|
||||
show (String text) = "\"" <> Text.foldr (mappend . Full.escape) "\"" text
|
||||
show (Boolean boolean') = show boolean'
|
||||
show Null = "null"
|
||||
show (Enum name) = Text.unpack name
|
||||
show (List list) = show list
|
||||
show (Object fields) = unwords
|
||||
[ "{"
|
||||
, intercalate ", " (HashMap.foldrWithKey showObject [] fields)
|
||||
, "}"
|
||||
]
|
||||
where
|
||||
showObject key value accumulator =
|
||||
concat [Text.unpack key, ": ", show value] : accumulator
|
||||
show variableValue = show variableValue
|
||||
|
||||
document :: Full.Document
|
||||
-> ([Full.OperationDefinition], HashMap Full.Name Full.FragmentDefinition)
|
||||
document = foldr filterOperation ([], HashMap.empty)
|
||||
where
|
||||
matchingName (OperationDefinition _ name _ _ _ _) =
|
||||
name == Just operationName
|
||||
filterOperation (Full.ExecutableDefinition executableDefinition) accumulator
|
||||
| Full.DefinitionOperation operationDefinition' <- executableDefinition =
|
||||
first (operationDefinition' :) accumulator
|
||||
| Full.DefinitionFragment fragmentDefinition <- executableDefinition
|
||||
, Full.FragmentDefinition fragmentName _ _ _ _ <- fragmentDefinition =
|
||||
HashMap.insert fragmentName fragmentDefinition <$> accumulator
|
||||
filterOperation _ accumulator = accumulator -- Type system definitions.
|
||||
|
||||
coerceVariableValues :: Coerce.VariableValue a
|
||||
=> forall m
|
||||
. HashMap Full.Name (Schema.Type m)
|
||||
-> OperationDefinition
|
||||
-> HashMap.HashMap Full.Name a
|
||||
-> Either QueryError Type.Subs
|
||||
coerceVariableValues types operationDefinition variableValues =
|
||||
let OperationDefinition _ _ variableDefinitions _ _ _ = operationDefinition
|
||||
in maybe (Left CoercionError) Right
|
||||
$ foldr forEach (Just HashMap.empty) variableDefinitions
|
||||
transform :: Monad m => Full.OperationDefinition -> TransformT m (Operation m)
|
||||
transform (Full.OperationDefinition operationType _ _ _ selectionSet' operationLocation) = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
pure $ Operation operationType transformedSelections operationLocation
|
||||
transform (Full.SelectionSet selectionSet' operationLocation) = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
pure $ Operation Full.Query transformedSelections operationLocation
|
||||
|
||||
selectionSet :: Monad m => Full.SelectionSet -> TransformT m (Seq (Selection m))
|
||||
selectionSet = selectionSetOpt . NonEmpty.toList
|
||||
|
||||
selectionSetOpt :: Monad m => Full.SelectionSetOpt -> TransformT m (Seq (Selection m))
|
||||
selectionSetOpt = foldM go Seq.empty
|
||||
where
|
||||
forEach variableDefinition coercedValues = do
|
||||
let Full.VariableDefinition variableName variableTypeName defaultValue _ =
|
||||
variableDefinition
|
||||
let defaultValue' = constValue . Full.node <$> defaultValue
|
||||
variableType <- Type.lookupInputType variableTypeName types
|
||||
go accumulatedSelections currentSelection =
|
||||
selection currentSelection <&> (accumulatedSelections ><)
|
||||
|
||||
Coerce.matchFieldValues
|
||||
coerceVariableValue'
|
||||
variableValues
|
||||
variableName
|
||||
variableType
|
||||
defaultValue'
|
||||
coercedValues
|
||||
coerceVariableValue' variableType value'
|
||||
= Coerce.coerceVariableValue variableType value'
|
||||
>>= Coerce.coerceInputLiteral variableType
|
||||
selection :: Monad m => Full.Selection -> TransformT m (Seq (Selection m))
|
||||
selection (Full.FieldSelection field') =
|
||||
maybeToSelectionSet FieldSelection $ field field'
|
||||
selection (Full.FragmentSpreadSelection fragmentSpread') =
|
||||
maybeToSelectionSet FragmentSelection $ fragmentSpread fragmentSpread'
|
||||
selection (Full.InlineFragmentSelection inlineFragment') =
|
||||
either id (pure . FragmentSelection) <$> inlineFragment inlineFragment'
|
||||
|
||||
constValue :: Full.ConstValue -> Type.Value
|
||||
constValue (Full.ConstInt i) = Type.Int i
|
||||
constValue (Full.ConstFloat f) = Type.Float f
|
||||
constValue (Full.ConstString x) = Type.String x
|
||||
constValue (Full.ConstBoolean b) = Type.Boolean b
|
||||
constValue Full.ConstNull = Type.Null
|
||||
constValue (Full.ConstEnum e) = Type.Enum e
|
||||
constValue (Full.ConstList list) = Type.List $ constValue . Full.node <$> list
|
||||
constValue (Full.ConstObject o) =
|
||||
Type.Object $ HashMap.fromList $ constObjectField <$> o
|
||||
maybeToSelectionSet :: Monad m
|
||||
=> forall a
|
||||
. (a -> Selection m)
|
||||
-> TransformT m (Maybe a)
|
||||
-> TransformT m (Seq (Selection m))
|
||||
maybeToSelectionSet selectionType = fmap (maybe Seq.empty $ pure . selectionType)
|
||||
|
||||
directives :: Monad m => [Full.Directive] -> TransformT m (Maybe [Definition.Directive])
|
||||
directives = fmap Type.selection . traverse directive
|
||||
|
||||
inlineFragment :: Monad m
|
||||
=> Full.InlineFragment
|
||||
-> TransformT m (Either (Seq (Selection m)) (Fragment m))
|
||||
inlineFragment (Full.InlineFragment maybeCondition directives' selectionSet' location)
|
||||
| Just typeCondition <- maybeCondition = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
maybeFragmentType <- asks
|
||||
$ Type.lookupTypeCondition typeCondition
|
||||
. types
|
||||
pure $ case transformedDirectives >> maybeFragmentType of
|
||||
Just fragmentType -> Right
|
||||
$ Fragment fragmentType transformedSelections location
|
||||
Nothing -> Left Seq.empty
|
||||
| otherwise = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
pure $ if isJust transformedDirectives
|
||||
then Left transformedSelections
|
||||
else Left Seq.empty
|
||||
|
||||
fragmentSpread :: Monad m => Full.FragmentSpread -> TransformT m (Maybe (Fragment m))
|
||||
fragmentSpread (Full.FragmentSpread spreadName directives' location) = do
|
||||
transformedDirectives <- directives directives'
|
||||
visitedFragment <- asks $ HashSet.member spreadName . visitedFragments
|
||||
possibleFragmentDefinition <- asks
|
||||
$ HashMap.lookup spreadName
|
||||
. fragmentDefinitions
|
||||
case transformedDirectives >> possibleFragmentDefinition of
|
||||
Just (Full.FragmentDefinition _ typeCondition _ selections _)
|
||||
| visitedFragment -> pure Nothing
|
||||
| otherwise -> do
|
||||
fragmentType <- asks
|
||||
$ Type.lookupTypeCondition typeCondition
|
||||
. types
|
||||
traverse (traverseSelections selections) fragmentType
|
||||
Nothing -> pure Nothing
|
||||
where
|
||||
constObjectField Full.ObjectField{value = value', ..} =
|
||||
(name, constValue $ Full.node value')
|
||||
traverseSelections selections typeCondition = do
|
||||
transformedSelections <- TransformT
|
||||
$ local fragmentInserter
|
||||
$ runTransformT
|
||||
$ selectionSet selections
|
||||
pure $ Fragment typeCondition transformedSelections location
|
||||
fragmentInserter replacement@Replacement{ visitedFragments } = replacement
|
||||
{ visitedFragments = HashSet.insert spreadName visitedFragments }
|
||||
|
||||
-- | Rewrites the original syntax tree into an intermediate representation used
|
||||
-- for query execution.
|
||||
document :: Coerce.VariableValue a
|
||||
=> forall m
|
||||
. Type.Schema m
|
||||
-> Maybe Full.Name
|
||||
field :: Monad m => Full.Field -> TransformT m (Maybe (Field m))
|
||||
field (Full.Field alias' name' arguments' directives' selectionSet' location') = do
|
||||
transformedSelections <- selectionSetOpt selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
transformedArguments <- arguments arguments'
|
||||
let transformedField = Field
|
||||
alias'
|
||||
name'
|
||||
transformedArguments
|
||||
transformedSelections
|
||||
location'
|
||||
pure $ transformedDirectives >> pure transformedField
|
||||
|
||||
arguments :: Monad m => [Full.Argument] -> TransformT m (HashMap Full.Name (Full.Node Input))
|
||||
arguments = foldM go HashMap.empty
|
||||
where
|
||||
go accumulator (Full.Argument name' valueNode argumentLocation) = do
|
||||
let replaceLocation = flip Full.Node argumentLocation . Full.node
|
||||
argumentValue <- fmap replaceLocation <$> node valueNode
|
||||
pure $ insertIfGiven name' argumentValue accumulator
|
||||
|
||||
directive :: Monad m => Full.Directive -> TransformT m Definition.Directive
|
||||
directive (Full.Directive name' arguments' _)
|
||||
= Definition.Directive name'
|
||||
. Type.Arguments
|
||||
<$> foldM go HashMap.empty arguments'
|
||||
where
|
||||
go accumulator (Full.Argument argumentName Full.Node{ node = node' } _) = do
|
||||
transformedValue <- directiveValue node'
|
||||
pure $ HashMap.insert argumentName transformedValue accumulator
|
||||
|
||||
directiveValue :: Monad m => Full.Value -> TransformT m Type.Value
|
||||
directiveValue = \case
|
||||
(Full.Variable name') -> asks
|
||||
$ HashMap.lookupDefault Type.Null name'
|
||||
. variableValues
|
||||
(Full.Int integer) -> pure $ Type.Int integer
|
||||
(Full.Float double) -> pure $ Type.Float double
|
||||
(Full.String string) -> pure $ Type.String string
|
||||
(Full.Boolean boolean) -> pure $ Type.Boolean boolean
|
||||
Full.Null -> pure Type.Null
|
||||
(Full.Enum enum) -> pure $ Type.Enum enum
|
||||
(Full.List list) -> Type.List <$> traverse directiveNode list
|
||||
(Full.Object objectFields) ->
|
||||
Type.Object <$> foldM objectField HashMap.empty objectFields
|
||||
where
|
||||
directiveNode Full.Node{ node = node'} = directiveValue node'
|
||||
objectField accumulator Full.ObjectField{ name, value } = do
|
||||
transformedValue <- directiveNode value
|
||||
pure $ HashMap.insert name transformedValue accumulator
|
||||
|
||||
input :: Monad m => Full.Value -> TransformT m (Maybe Input)
|
||||
input (Full.Variable name') =
|
||||
asks (HashMap.lookup name' . variableValues) <&> fmap Variable
|
||||
input (Full.Int integer) = pure $ Just $ Int integer
|
||||
input (Full.Float double) = pure $ Just $ Float double
|
||||
input (Full.String string) = pure $ Just $ String string
|
||||
input (Full.Boolean boolean) = pure $ Just $ Boolean boolean
|
||||
input Full.Null = pure $ Just Null
|
||||
input (Full.Enum enum) = pure $ Just $ Enum enum
|
||||
input (Full.List list) = Just . List
|
||||
<$> traverse (fmap (fromMaybe Null) . input . Full.node) list
|
||||
input (Full.Object objectFields) = Just . Object
|
||||
<$> foldM objectField HashMap.empty objectFields
|
||||
where
|
||||
objectField accumulator Full.ObjectField{..} = do
|
||||
objectFieldValue <- fmap Full.node <$> node value
|
||||
pure $ insertIfGiven name objectFieldValue accumulator
|
||||
|
||||
insertIfGiven :: forall a
|
||||
. Full.Name
|
||||
-> Maybe a
|
||||
-> HashMap Full.Name a
|
||||
-> Full.Document
|
||||
-> Either QueryError (Document m)
|
||||
document schema operationName subs ast = do
|
||||
let referencedTypes = Schema.types schema
|
||||
-> HashMap Full.Name a
|
||||
insertIfGiven name (Just v) = HashMap.insert name v
|
||||
insertIfGiven _ _ = id
|
||||
|
||||
(operations, fragmentTable) <- defragment ast
|
||||
chosenOperation <- getOperation operationName operations
|
||||
coercedValues <- coerceVariableValues referencedTypes chosenOperation subs
|
||||
node :: Monad m => Full.Node Full.Value -> TransformT m (Maybe (Full.Node Input))
|
||||
node Full.Node{node = node', ..} =
|
||||
traverse Full.Node <$> input node' <*> pure location
|
||||
|
||||
let replacement = Replacement
|
||||
{ fragments = HashMap.empty
|
||||
, fragmentDefinitions = fragmentTable
|
||||
, variableValues = coercedValues
|
||||
, types = referencedTypes
|
||||
}
|
||||
case chosenOperation of
|
||||
OperationDefinition Full.Query _ _ _ _ _ ->
|
||||
pure $ Document referencedTypes (Schema.query schema)
|
||||
$ operation chosenOperation replacement
|
||||
OperationDefinition Full.Mutation _ _ _ _ _
|
||||
| Just mutationType <- Schema.mutation schema ->
|
||||
pure $ Document referencedTypes mutationType
|
||||
$ operation chosenOperation replacement
|
||||
OperationDefinition Full.Subscription _ _ _ _ _
|
||||
| Just subscriptionType <- Schema.subscription schema ->
|
||||
pure $ Document referencedTypes subscriptionType
|
||||
$ operation chosenOperation replacement
|
||||
_ -> Left UnsupportedRootOperation
|
||||
|
||||
defragment
|
||||
:: Full.Document
|
||||
-> Either QueryError (NonEmpty OperationDefinition, FragmentDefinitions)
|
||||
defragment ast =
|
||||
let (operations, fragmentTable) = foldr defragment' ([], HashMap.empty) ast
|
||||
nonEmptyOperations = NonEmpty.nonEmpty operations
|
||||
emptyDocument = Left EmptyDocument
|
||||
in (, fragmentTable) <$> maybe emptyDocument Right nonEmptyOperations
|
||||
where
|
||||
defragment' definition (operations, fragments')
|
||||
| (Full.ExecutableDefinition executable) <- definition
|
||||
, (Full.DefinitionOperation operation') <- executable =
|
||||
(transform operation' : operations, fragments')
|
||||
| (Full.ExecutableDefinition executable) <- definition
|
||||
, (Full.DefinitionFragment fragment) <- executable
|
||||
, (Full.FragmentDefinition name _ _ _ _) <- fragment =
|
||||
(operations, HashMap.insert name fragment fragments')
|
||||
defragment' _ acc = acc
|
||||
transform = \case
|
||||
Full.OperationDefinition type' name variables directives' selections location ->
|
||||
OperationDefinition type' name variables directives' selections location
|
||||
Full.SelectionSet selectionSet location ->
|
||||
OperationDefinition Full.Query Nothing mempty mempty selectionSet location
|
||||
|
||||
-- * Operation
|
||||
|
||||
operation :: OperationDefinition -> Replacement m -> Operation m
|
||||
operation operationDefinition replacement
|
||||
= runIdentity
|
||||
$ evalStateT (collectFragments >> transform operationDefinition) replacement
|
||||
where
|
||||
transform (OperationDefinition Full.Query name _ _ sels location) =
|
||||
flip (Query name) location <$> appendSelection sels
|
||||
transform (OperationDefinition Full.Mutation name _ _ sels location) =
|
||||
flip (Mutation name) location <$> appendSelection sels
|
||||
transform (OperationDefinition Full.Subscription name _ _ sels location) =
|
||||
flip (Subscription name) location <$> appendSelection sels
|
||||
|
||||
-- * Selection
|
||||
|
||||
selection
|
||||
:: Full.Selection
|
||||
-> State (Replacement m) (Either (Seq (Selection m)) (Selection m))
|
||||
selection (Full.FieldSelection fieldSelection) =
|
||||
maybe (Left mempty) (Right . SelectionField) <$> field fieldSelection
|
||||
selection (Full.FragmentSpreadSelection fragmentSelection)
|
||||
= maybe (Left mempty) (Right . SelectionFragment)
|
||||
<$> fragmentSpread fragmentSelection
|
||||
selection (Full.InlineFragmentSelection fragmentSelection) =
|
||||
inlineFragment fragmentSelection
|
||||
|
||||
field :: Full.Field -> State (Replacement m) (Maybe (Field m))
|
||||
field (Full.Field alias name arguments' directives' selections location) = do
|
||||
fieldArguments <- foldM go HashMap.empty arguments'
|
||||
fieldSelections <- appendSelection selections
|
||||
fieldDirectives <- Definition.selection <$> directives directives'
|
||||
let field' = Field alias name fieldArguments fieldSelections location
|
||||
pure $ field' <$ fieldDirectives
|
||||
where
|
||||
go arguments (Full.Argument name' (Full.Node value' _) location') = do
|
||||
objectFieldValue <- input value'
|
||||
case objectFieldValue of
|
||||
Just fieldValue ->
|
||||
let argumentNode = Full.Node fieldValue location'
|
||||
in pure $ HashMap.insert name' argumentNode arguments
|
||||
Nothing -> pure arguments
|
||||
|
||||
fragmentSpread
|
||||
:: Full.FragmentSpread
|
||||
-> State (Replacement m) (Maybe (Fragment m))
|
||||
fragmentSpread (Full.FragmentSpread name directives' _) = do
|
||||
spreadDirectives <- Definition.selection <$> directives directives'
|
||||
fragments' <- gets fragments
|
||||
|
||||
fragmentDefinitions' <- gets fragmentDefinitions
|
||||
case HashMap.lookup name fragments' of
|
||||
Just definition -> lift $ pure $ definition <$ spreadDirectives
|
||||
Nothing
|
||||
| Just definition <- HashMap.lookup name fragmentDefinitions' -> do
|
||||
fragDef <- fragmentDefinition definition
|
||||
case fragDef of
|
||||
Just fragment -> lift $ pure $ fragment <$ spreadDirectives
|
||||
_ -> lift $ pure Nothing
|
||||
| otherwise -> lift $ pure Nothing
|
||||
|
||||
inlineFragment
|
||||
:: Full.InlineFragment
|
||||
-> State (Replacement m) (Either (Seq (Selection m)) (Selection m))
|
||||
inlineFragment (Full.InlineFragment type' directives' selections _) = do
|
||||
fragmentDirectives <- Definition.selection <$> directives directives'
|
||||
case fragmentDirectives of
|
||||
Nothing -> pure $ Left mempty
|
||||
_ -> do
|
||||
fragmentSelectionSet <- appendSelection selections
|
||||
|
||||
case type' of
|
||||
Nothing -> pure $ Left fragmentSelectionSet
|
||||
Just typeName -> do
|
||||
types' <- gets types
|
||||
case Type.lookupTypeCondition typeName types' of
|
||||
Just typeCondition -> pure $
|
||||
selectionFragment typeCondition fragmentSelectionSet
|
||||
Nothing -> pure $ Left mempty
|
||||
where
|
||||
selectionFragment typeName = Right
|
||||
. SelectionFragment
|
||||
. Fragment typeName
|
||||
|
||||
appendSelection :: Traversable t
|
||||
=> t Full.Selection
|
||||
-> State (Replacement m) (Seq (Selection m))
|
||||
appendSelection = foldM go mempty
|
||||
where
|
||||
go acc sel = append acc <$> selection sel
|
||||
append acc (Left list) = list >< acc
|
||||
append acc (Right one) = one <| acc
|
||||
|
||||
directives :: [Full.Directive] -> State (Replacement m) [Definition.Directive]
|
||||
directives = traverse directive
|
||||
where
|
||||
directive (Full.Directive directiveName directiveArguments _)
|
||||
= Definition.Directive directiveName . Type.Arguments
|
||||
<$> foldM go HashMap.empty directiveArguments
|
||||
go arguments (Full.Argument name (Full.Node value' _) _) = do
|
||||
substitutedValue <- value value'
|
||||
return $ HashMap.insert name substitutedValue arguments
|
||||
|
||||
-- * Fragment replacement
|
||||
|
||||
-- | Extract fragment definitions into a single 'HashMap'.
|
||||
collectFragments :: State (Replacement m) ()
|
||||
collectFragments = do
|
||||
fragDefs <- gets fragmentDefinitions
|
||||
let nextValue = head $ HashMap.elems fragDefs
|
||||
unless (HashMap.null fragDefs) $ do
|
||||
_ <- fragmentDefinition nextValue
|
||||
collectFragments
|
||||
|
||||
fragmentDefinition
|
||||
:: Full.FragmentDefinition
|
||||
-> State (Replacement m) (Maybe (Fragment m))
|
||||
fragmentDefinition (Full.FragmentDefinition name type' _ selections _) = do
|
||||
modify deleteFragmentDefinition
|
||||
fragmentSelection <- appendSelection selections
|
||||
types' <- gets types
|
||||
|
||||
case Type.lookupTypeCondition type' types' of
|
||||
Just compositeType -> do
|
||||
let newValue = Fragment compositeType fragmentSelection
|
||||
modify $ insertFragment newValue
|
||||
lift $ pure $ Just newValue
|
||||
_ -> lift $ pure Nothing
|
||||
where
|
||||
deleteFragmentDefinition replacement@Replacement{..} =
|
||||
let newDefinitions = HashMap.delete name fragmentDefinitions
|
||||
in replacement{ fragmentDefinitions = newDefinitions }
|
||||
insertFragment newValue replacement@Replacement{..} =
|
||||
let newFragments = HashMap.insert name newValue fragments
|
||||
in replacement{ fragments = newFragments }
|
||||
|
||||
value :: forall m. Full.Value -> State (Replacement m) Type.Value
|
||||
value (Full.Variable name) =
|
||||
gets (fromMaybe Type.Null . HashMap.lookup name . variableValues)
|
||||
value (Full.Int int) = pure $ Type.Int int
|
||||
value (Full.Float float) = pure $ Type.Float float
|
||||
value (Full.String string) = pure $ Type.String string
|
||||
value (Full.Boolean boolean) = pure $ Type.Boolean boolean
|
||||
value Full.Null = pure Type.Null
|
||||
value (Full.Enum enum) = pure $ Type.Enum enum
|
||||
value (Full.List list) = Type.List <$> traverse (value . Full.node) list
|
||||
value (Full.Object object) =
|
||||
Type.Object . HashMap.fromList <$> traverse objectField object
|
||||
where
|
||||
objectField Full.ObjectField{value = value', ..} =
|
||||
(name,) <$> value (Full.node value')
|
||||
|
||||
input :: forall m. Full.Value -> State (Replacement m) (Maybe Input)
|
||||
input (Full.Variable name) =
|
||||
gets (fmap Variable . HashMap.lookup name . variableValues)
|
||||
input (Full.Int int) = pure $ pure $ Int int
|
||||
input (Full.Float float) = pure $ pure $ Float float
|
||||
input (Full.String string) = pure $ pure $ String string
|
||||
input (Full.Boolean boolean) = pure $ pure $ Boolean boolean
|
||||
input Full.Null = pure $ pure Null
|
||||
input (Full.Enum enum) = pure $ pure $ Enum enum
|
||||
input (Full.List list) = pure . List <$> traverse (value . Full.node) list
|
||||
input (Full.Object object) = do
|
||||
objectFields <- foldM objectField HashMap.empty object
|
||||
pure $ pure $ Object objectFields
|
||||
where
|
||||
objectField resultMap Full.ObjectField{value = value', ..} =
|
||||
inputField resultMap name $ Full.node value'
|
||||
|
||||
inputField :: forall m
|
||||
. HashMap Full.Name Input
|
||||
-> Full.Name
|
||||
-> Full.Value
|
||||
-> State (Replacement m) (HashMap Full.Name Input)
|
||||
inputField resultMap name value' = do
|
||||
objectFieldValue <- input value'
|
||||
case objectFieldValue of
|
||||
Just fieldValue -> pure $ HashMap.insert name fieldValue resultMap
|
||||
Nothing -> pure resultMap
|
||||
|
||||
@@ -1,847 +0,0 @@
|
||||
{- This Source Code Form is subject to the terms of the Mozilla Public License,
|
||||
v. 2.0. If a copy of the MPL was not distributed with this file, You can
|
||||
obtain one at https://mozilla.org/MPL/2.0/. -}
|
||||
|
||||
{-# LANGUAGE ExistentialQuantification #-}
|
||||
{-# LANGUAGE LambdaCase #-}
|
||||
{-# LANGUAGE NamedFieldPuns #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE RecordWildCards #-}
|
||||
|
||||
module Language.GraphQL.Executor
|
||||
( Error(..)
|
||||
, Operation(..)
|
||||
, Path(..)
|
||||
, ResponseEventStream
|
||||
, Response(..)
|
||||
, execute
|
||||
) where
|
||||
|
||||
import Conduit (ConduitT, mapMC, (.|))
|
||||
import Control.Arrow (left)
|
||||
import Control.Monad.Catch
|
||||
( Exception(..)
|
||||
, MonadCatch(..)
|
||||
, MonadThrow(..)
|
||||
, SomeException(..)
|
||||
)
|
||||
import Control.Monad.Trans.Class (MonadTrans(..))
|
||||
import Control.Monad.Trans.Reader (ReaderT(..), ask, local, runReaderT)
|
||||
import Control.Monad.Trans.Writer (WriterT(..), runWriterT, tell)
|
||||
import qualified Control.Monad.Trans.Reader as Reader
|
||||
import Control.Monad (foldM)
|
||||
import qualified Language.GraphQL.AST.Document as Full
|
||||
import Data.Bifunctor (first)
|
||||
import Data.Foldable (find)
|
||||
import Data.Functor ((<&>))
|
||||
import Data.HashMap.Strict (HashMap)
|
||||
import qualified Data.HashMap.Strict as HashMap
|
||||
import Data.HashSet (HashSet)
|
||||
import qualified Data.HashSet as HashSet
|
||||
import Data.Int (Int32)
|
||||
import Data.List.NonEmpty (NonEmpty(..))
|
||||
import qualified Data.List.NonEmpty as NonEmpty
|
||||
import Data.Maybe (fromMaybe, isJust)
|
||||
import Data.Sequence (Seq, (><))
|
||||
import qualified Data.Sequence as Seq
|
||||
import Data.Text (Text)
|
||||
import qualified Data.Text as Text
|
||||
import Data.Typeable (cast)
|
||||
import qualified Language.GraphQL.Execute.Coerce as Coerce
|
||||
import Language.GraphQL.Execute.OrderedMap (OrderedMap)
|
||||
import qualified Language.GraphQL.Execute.OrderedMap as OrderedMap
|
||||
import qualified Language.GraphQL.Type.In as In
|
||||
import qualified Language.GraphQL.Type.Out as Out
|
||||
import qualified Language.GraphQL.Type as Type
|
||||
import qualified Language.GraphQL.Type.Internal as Type.Internal
|
||||
import Language.GraphQL.Type.Schema (Schema, Type)
|
||||
import qualified Language.GraphQL.Type.Schema as Schema
|
||||
import Language.GraphQL.Error (Error(..), Response(..), Path(..))
|
||||
|
||||
data Replacement m = Replacement
|
||||
{ variableValues :: Type.Subs
|
||||
, fragmentDefinitions :: HashMap Full.Name Full.FragmentDefinition
|
||||
, visitedFragments :: HashSet Full.Name
|
||||
, types :: HashMap Full.Name (Type m)
|
||||
}
|
||||
|
||||
newtype TransformT m a = TransformT
|
||||
{ runTransformT :: ReaderT (Replacement m) m a
|
||||
}
|
||||
|
||||
instance Functor m => Functor (TransformT m) where
|
||||
fmap f = TransformT . fmap f . runTransformT
|
||||
|
||||
instance Applicative m => Applicative (TransformT m) where
|
||||
pure = TransformT . pure
|
||||
TransformT f <*> TransformT x = TransformT $ f <*> x
|
||||
|
||||
instance Monad m => Monad (TransformT m) where
|
||||
TransformT x >>= f = TransformT $ x >>= runTransformT . f
|
||||
|
||||
instance MonadTrans TransformT where
|
||||
lift = TransformT . lift
|
||||
|
||||
instance MonadThrow m => MonadThrow (TransformT m) where
|
||||
throwM = lift . throwM
|
||||
|
||||
instance MonadCatch m => MonadCatch (TransformT m) where
|
||||
catch (TransformT stack) handler =
|
||||
TransformT $ catch stack $ runTransformT . handler
|
||||
|
||||
newtype ExecutorT m a = ExecutorT
|
||||
{ runExecutorT :: ReaderT (HashMap Full.Name (Type m)) (WriterT (Seq Error) m) a
|
||||
}
|
||||
|
||||
instance Functor m => Functor (ExecutorT m) where
|
||||
fmap f = ExecutorT . fmap f . runExecutorT
|
||||
|
||||
instance Applicative m => Applicative (ExecutorT m) where
|
||||
pure = ExecutorT . pure
|
||||
ExecutorT f <*> ExecutorT x = ExecutorT $ f <*> x
|
||||
|
||||
instance Monad m => Monad (ExecutorT m) where
|
||||
ExecutorT x >>= f = ExecutorT $ x >>= runExecutorT . f
|
||||
|
||||
instance MonadTrans ExecutorT where
|
||||
lift = ExecutorT . lift . lift
|
||||
|
||||
instance MonadThrow m => MonadThrow (ExecutorT m) where
|
||||
throwM = lift . throwM
|
||||
|
||||
instance MonadCatch m => MonadCatch (ExecutorT m) where
|
||||
catch (ExecutorT stack) handler =
|
||||
ExecutorT $ catch stack $ runExecutorT . handler
|
||||
|
||||
data GraphQLException = forall e. Exception e => GraphQLException e
|
||||
|
||||
instance Show GraphQLException where
|
||||
show (GraphQLException e) = show e
|
||||
|
||||
instance Exception GraphQLException
|
||||
|
||||
graphQLExceptionToException :: Exception e => e -> SomeException
|
||||
graphQLExceptionToException = toException . GraphQLException
|
||||
|
||||
graphQLExceptionFromException :: Exception e => SomeException -> Maybe e
|
||||
graphQLExceptionFromException e = do
|
||||
GraphQLException graphqlException <- fromException e
|
||||
cast graphqlException
|
||||
|
||||
data ResolverException = forall e. Exception e => ResolverException e
|
||||
|
||||
instance Show ResolverException where
|
||||
show (ResolverException e) = show e
|
||||
|
||||
instance Exception ResolverException where
|
||||
toException = graphQLExceptionToException
|
||||
fromException = graphQLExceptionFromException
|
||||
|
||||
data FieldError
|
||||
= ArgumentTypeError
|
||||
| MissingArgumentError
|
||||
| EnumCompletionError
|
||||
| InterfaceCompletionError
|
||||
| UnionCompletionError
|
||||
| ValueCompletionError
|
||||
| ResultCoercionError
|
||||
| NullResultError
|
||||
|
||||
instance Show FieldError where
|
||||
show ArgumentTypeError = "Invalid argument type."
|
||||
show MissingArgumentError = "Required argument not specified."
|
||||
show EnumCompletionError = "Enum value completion failed."
|
||||
show InterfaceCompletionError = "Interface value completion failed."
|
||||
show UnionCompletionError = "Union value completion failed."
|
||||
show ValueCompletionError = "Value completion failed."
|
||||
show ResultCoercionError = "Result coercion failed."
|
||||
show NullResultError = "Non-Nullable field resolver returned Null."
|
||||
|
||||
newtype FieldException = FieldException FieldError
|
||||
deriving Show
|
||||
|
||||
instance Exception FieldException where
|
||||
toException = graphQLExceptionToException
|
||||
fromException = graphQLExceptionFromException
|
||||
|
||||
data QueryError
|
||||
= OperationNameRequired
|
||||
| OperationNotFound String
|
||||
| CoercionError Full.VariableDefinition
|
||||
| UnknownInputType Full.VariableDefinition
|
||||
|
||||
asks :: Monad m => forall a. (Replacement m -> a) -> TransformT m a
|
||||
asks = TransformT . Reader.asks
|
||||
|
||||
queryError :: QueryError -> Error
|
||||
queryError OperationNameRequired =
|
||||
Error{ message = "Operation name is required.", locations = [], path = [] }
|
||||
queryError (OperationNotFound operationName) =
|
||||
let queryErrorMessage = Text.concat
|
||||
[ "Operation \""
|
||||
, Text.pack operationName
|
||||
, "\" not found."
|
||||
]
|
||||
in Error{ message = queryErrorMessage, locations = [], path = [] }
|
||||
queryError (CoercionError variableDefinition) =
|
||||
let Full.VariableDefinition variableName _ _ location = variableDefinition
|
||||
queryErrorMessage = Text.concat
|
||||
[ "Failed to coerce the variable \""
|
||||
, variableName
|
||||
, "\"."
|
||||
]
|
||||
in Error{ message = queryErrorMessage, locations = [location], path = [] }
|
||||
queryError (UnknownInputType variableDefinition) =
|
||||
let Full.VariableDefinition variableName variableTypeName _ location = variableDefinition
|
||||
queryErrorMessage = Text.concat
|
||||
[ "Variable \""
|
||||
, variableName
|
||||
, "\" has unknown type \""
|
||||
, Text.pack $ show variableTypeName
|
||||
, "\"."
|
||||
]
|
||||
in Error{ message = queryErrorMessage, locations = [location], path = [] }
|
||||
|
||||
data Operation m
|
||||
= Operation Full.OperationType (Seq (Selection m)) Full.Location
|
||||
|
||||
data Selection m
|
||||
= FieldSelection (Field m)
|
||||
| FragmentSelection (Fragment m)
|
||||
|
||||
data Field m = Field
|
||||
(Maybe Full.Name)
|
||||
Full.Name
|
||||
(HashMap Full.Name (Full.Node Input))
|
||||
(Seq (Selection m))
|
||||
Full.Location
|
||||
|
||||
data Fragment m = Fragment
|
||||
(Type.Internal.CompositeType m) (Seq (Selection m)) Full.Location
|
||||
|
||||
data Input
|
||||
= Variable Type.Value
|
||||
| Int Int32
|
||||
| Float Double
|
||||
| String Text
|
||||
| Boolean Bool
|
||||
| Null
|
||||
| Enum Full.Name
|
||||
| List [Input]
|
||||
| Object (HashMap Full.Name Input)
|
||||
|
||||
document :: Full.Document
|
||||
-> ([Full.OperationDefinition], HashMap Full.Name Full.FragmentDefinition)
|
||||
document = foldr filterOperation ([], HashMap.empty)
|
||||
where
|
||||
filterOperation (Full.ExecutableDefinition executableDefinition) accumulator
|
||||
| Full.DefinitionOperation operationDefinition' <- executableDefinition =
|
||||
first (operationDefinition' :) accumulator
|
||||
| Full.DefinitionFragment fragmentDefinition <- executableDefinition
|
||||
, Full.FragmentDefinition fragmentName _ _ _ _ <- fragmentDefinition =
|
||||
HashMap.insert fragmentName fragmentDefinition <$> accumulator
|
||||
filterOperation _ accumulator = accumulator -- Type system definitions.
|
||||
|
||||
transform :: Monad m => Full.OperationDefinition -> TransformT m (Operation m)
|
||||
transform (Full.OperationDefinition operationType _ _ _ selectionSet' operationLocation) = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
pure $ Operation operationType transformedSelections operationLocation
|
||||
transform (Full.SelectionSet selectionSet' operationLocation) = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
pure $ Operation Full.Query transformedSelections operationLocation
|
||||
|
||||
selectionSet :: Monad m => Full.SelectionSet -> TransformT m (Seq (Selection m))
|
||||
selectionSet = selectionSetOpt . NonEmpty.toList
|
||||
|
||||
selectionSetOpt :: Monad m => Full.SelectionSetOpt -> TransformT m (Seq (Selection m))
|
||||
selectionSetOpt = foldM go Seq.empty
|
||||
where
|
||||
go accumulatedSelections currentSelection =
|
||||
selection currentSelection <&> (accumulatedSelections ><)
|
||||
|
||||
selection :: Monad m => Full.Selection -> TransformT m (Seq (Selection m))
|
||||
selection (Full.FieldSelection field') =
|
||||
maybeToSelectionSet FieldSelection $ field field'
|
||||
selection (Full.FragmentSpreadSelection fragmentSpread') =
|
||||
maybeToSelectionSet FragmentSelection $ fragmentSpread fragmentSpread'
|
||||
selection (Full.InlineFragmentSelection inlineFragment') =
|
||||
either id (pure . FragmentSelection) <$> inlineFragment inlineFragment'
|
||||
|
||||
maybeToSelectionSet :: Monad m
|
||||
=> forall a
|
||||
. (a -> Selection m)
|
||||
-> TransformT m (Maybe a)
|
||||
-> TransformT m (Seq (Selection m))
|
||||
maybeToSelectionSet selectionType = fmap (maybe Seq.empty $ pure . selectionType)
|
||||
|
||||
directives :: Monad m => [Full.Directive] -> TransformT m (Maybe [Type.Directive])
|
||||
directives = fmap Type.selection . traverse directive
|
||||
|
||||
inlineFragment :: Monad m
|
||||
=> Full.InlineFragment
|
||||
-> TransformT m (Either (Seq (Selection m)) (Fragment m))
|
||||
inlineFragment (Full.InlineFragment maybeCondition directives' selectionSet' location)
|
||||
| Just typeCondition <- maybeCondition = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
maybeFragmentType <- asks
|
||||
$ Type.Internal.lookupTypeCondition typeCondition
|
||||
. types
|
||||
pure $ case transformedDirectives >> maybeFragmentType of
|
||||
Just fragmentType -> Right
|
||||
$ Fragment fragmentType transformedSelections location
|
||||
Nothing -> Left Seq.empty
|
||||
| otherwise = do
|
||||
transformedSelections <- selectionSet selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
pure $ if isJust transformedDirectives
|
||||
then Left transformedSelections
|
||||
else Left Seq.empty
|
||||
|
||||
fragmentSpread :: Monad m => Full.FragmentSpread -> TransformT m (Maybe (Fragment m))
|
||||
fragmentSpread (Full.FragmentSpread spreadName directives' location) = do
|
||||
transformedDirectives <- directives directives'
|
||||
visitedFragment <- asks $ HashSet.member spreadName . visitedFragments
|
||||
possibleFragmentDefinition <- asks
|
||||
$ HashMap.lookup spreadName
|
||||
. fragmentDefinitions
|
||||
case transformedDirectives >> possibleFragmentDefinition of
|
||||
Just (Full.FragmentDefinition _ typeCondition _ selections _)
|
||||
| visitedFragment -> pure Nothing
|
||||
| otherwise -> do
|
||||
fragmentType <- asks
|
||||
$ Type.Internal.lookupTypeCondition typeCondition
|
||||
. types
|
||||
traverse (traverseSelections selections) fragmentType
|
||||
Nothing -> pure Nothing
|
||||
where
|
||||
traverseSelections selections typeCondition = do
|
||||
transformedSelections <- TransformT
|
||||
$ local fragmentInserter
|
||||
$ runTransformT
|
||||
$ selectionSet selections
|
||||
pure $ Fragment typeCondition transformedSelections location
|
||||
fragmentInserter replacement@Replacement{ visitedFragments } = replacement
|
||||
{ visitedFragments = HashSet.insert spreadName visitedFragments }
|
||||
|
||||
field :: Monad m => Full.Field -> TransformT m (Maybe (Field m))
|
||||
field (Full.Field alias' name' arguments' directives' selectionSet' location') = do
|
||||
transformedSelections <- selectionSetOpt selectionSet'
|
||||
transformedDirectives <- directives directives'
|
||||
transformedArguments <- arguments arguments'
|
||||
let transformedField = Field
|
||||
alias'
|
||||
name'
|
||||
transformedArguments
|
||||
transformedSelections
|
||||
location'
|
||||
pure $ transformedDirectives >> pure transformedField
|
||||
|
||||
arguments :: Monad m => [Full.Argument] -> TransformT m (HashMap Full.Name (Full.Node Input))
|
||||
arguments = foldM go HashMap.empty
|
||||
where
|
||||
go accumulator (Full.Argument name' valueNode _) = do
|
||||
argumentValue <- node valueNode
|
||||
pure $ insertIfGiven name' argumentValue accumulator
|
||||
|
||||
directive :: Monad m => Full.Directive -> TransformT m Type.Directive
|
||||
directive (Full.Directive name' arguments' _)
|
||||
= Type.Directive name'
|
||||
. Type.Arguments
|
||||
<$> foldM go HashMap.empty arguments'
|
||||
where
|
||||
go accumulator (Full.Argument argumentName Full.Node{ node = node' } _) = do
|
||||
transformedValue <- directiveValue node'
|
||||
pure $ HashMap.insert argumentName transformedValue accumulator
|
||||
|
||||
directiveValue :: Monad m => Full.Value -> TransformT m Type.Value
|
||||
directiveValue = \case
|
||||
(Full.Variable name') -> asks
|
||||
$ HashMap.lookupDefault Type.Null name'
|
||||
. variableValues
|
||||
(Full.Int integer) -> pure $ Type.Int integer
|
||||
(Full.Float double) -> pure $ Type.Float double
|
||||
(Full.String string) -> pure $ Type.String string
|
||||
(Full.Boolean boolean) -> pure $ Type.Boolean boolean
|
||||
Full.Null -> pure Type.Null
|
||||
(Full.Enum enum) -> pure $ Type.Enum enum
|
||||
(Full.List list) -> Type.List <$> traverse directiveNode list
|
||||
(Full.Object objectFields) ->
|
||||
Type.Object <$> foldM objectField HashMap.empty objectFields
|
||||
where
|
||||
directiveNode Full.Node{ node = node'} = directiveValue node'
|
||||
objectField accumulator Full.ObjectField{ name, value } = do
|
||||
transformedValue <- directiveNode value
|
||||
pure $ HashMap.insert name transformedValue accumulator
|
||||
|
||||
input :: Monad m => Full.Value -> TransformT m (Maybe Input)
|
||||
input (Full.Variable name') =
|
||||
asks (HashMap.lookup name' . variableValues) <&> fmap Variable
|
||||
input (Full.Int integer) = pure $ Just $ Int integer
|
||||
input (Full.Float double) = pure $ Just $ Float double
|
||||
input (Full.String string) = pure $ Just $ String string
|
||||
input (Full.Boolean boolean) = pure $ Just $ Boolean boolean
|
||||
input Full.Null = pure $ Just Null
|
||||
input (Full.Enum enum) = pure $ Just $ Enum enum
|
||||
input (Full.List list) = Just . List
|
||||
<$> traverse (fmap (fromMaybe Null) . input . Full.node) list
|
||||
input (Full.Object objectFields) = Just . Object
|
||||
<$> foldM objectField HashMap.empty objectFields
|
||||
where
|
||||
objectField accumulator Full.ObjectField{..} = do
|
||||
objectFieldValue <- fmap Full.node <$> node value
|
||||
pure $ insertIfGiven name objectFieldValue accumulator
|
||||
|
||||
insertIfGiven :: forall a
|
||||
. Full.Name
|
||||
-> Maybe a
|
||||
-> HashMap Full.Name a
|
||||
-> HashMap Full.Name a
|
||||
insertIfGiven name (Just v) = HashMap.insert name v
|
||||
insertIfGiven _ _ = id
|
||||
|
||||
node :: Monad m => Full.Node Full.Value -> TransformT m (Maybe (Full.Node Input))
|
||||
node Full.Node{node = node', ..} =
|
||||
traverse Full.Node <$> input node' <*> pure location
|
||||
|
||||
execute :: (MonadCatch m, Coerce.VariableValue a, Coerce.Serialize b)
|
||||
=> Schema m -- ^ Resolvers.
|
||||
-> Maybe Text -- ^ Operation name.
|
||||
-> HashMap Full.Name a -- ^ Variable substitution function.
|
||||
-> Full.Document -- @GraphQL@ document.
|
||||
-> m (Either (ResponseEventStream m b) (Response b))
|
||||
execute schema' operationName subs document' =
|
||||
executeRequest schema' document' (Text.unpack <$> operationName) subs
|
||||
|
||||
executeRequest :: (MonadCatch m, Coerce.Serialize a, Coerce.VariableValue b)
|
||||
=> Schema m
|
||||
-> Full.Document
|
||||
-> Maybe String
|
||||
-> HashMap Full.Name b
|
||||
-> m (Either (ResponseEventStream m a) (Response a))
|
||||
executeRequest schema sourceDocument operationName variableValues = do
|
||||
operationAndVariables <- sequence buildOperation
|
||||
case operationAndVariables of
|
||||
Left queryError' -> pure
|
||||
$ Right
|
||||
$ Response Coerce.null $ pure $ queryError queryError'
|
||||
Right operation
|
||||
| Operation Full.Query topSelections _operationLocation <- operation ->
|
||||
Right <$> executeQuery topSelections schema
|
||||
| Operation Full.Mutation topSelections operationLocation <- operation ->
|
||||
Right <$> executeMutation topSelections schema operationLocation
|
||||
| Operation Full.Subscription topSelections operationLocation <- operation ->
|
||||
either rightErrorResponse Left <$> subscribe topSelections schema operationLocation
|
||||
where
|
||||
schemaTypes = Schema.types schema
|
||||
(operationDefinitions, fragmentDefinitions') = document sourceDocument
|
||||
buildOperation = do
|
||||
operationDefinition <- getOperation operationDefinitions operationName
|
||||
coercedVariableValues <- coerceVariableValues
|
||||
schemaTypes
|
||||
operationDefinition
|
||||
variableValues
|
||||
let replacement = Replacement
|
||||
{ variableValues = coercedVariableValues
|
||||
, fragmentDefinitions = fragmentDefinitions'
|
||||
, visitedFragments = mempty
|
||||
, types = schemaTypes
|
||||
}
|
||||
pure $ flip runReaderT replacement
|
||||
$ runTransformT
|
||||
$ transform operationDefinition
|
||||
|
||||
rightErrorResponse :: Coerce.Serialize b => forall a. Error -> Either a (Response b)
|
||||
rightErrorResponse = Right . Response Coerce.null . pure
|
||||
|
||||
getOperation :: [Full.OperationDefinition] -> Maybe String -> Either QueryError Full.OperationDefinition
|
||||
getOperation [operation] Nothing = Right operation
|
||||
getOperation operations (Just givenOperationName)
|
||||
= maybe (Left $ OperationNotFound givenOperationName) Right
|
||||
$ find findOperationByName operations
|
||||
where
|
||||
findOperationByName (Full.OperationDefinition _ (Just operationName) _ _ _ _) =
|
||||
givenOperationName == Text.unpack operationName
|
||||
findOperationByName _ = False
|
||||
getOperation _ _ = Left OperationNameRequired
|
||||
|
||||
executeQuery :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
-> Schema m
|
||||
-> m (Response a)
|
||||
executeQuery topSelections schema = do
|
||||
let queryType = Schema.query schema
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT (Schema.types schema)
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet topSelections queryType Type.Null []
|
||||
pure $ Response data' errors
|
||||
|
||||
executeMutation :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
-> Schema m
|
||||
-> Full.Location
|
||||
-> m (Response a)
|
||||
executeMutation topSelections schema operationLocation
|
||||
| Just mutationType <- Schema.mutation schema = do
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT (Schema.types schema)
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet topSelections mutationType Type.Null []
|
||||
pure $ Response data' errors
|
||||
| otherwise = pure
|
||||
$ Response Coerce.null
|
||||
$ Seq.singleton
|
||||
$ Error "Schema doesn't support mutations." [operationLocation] []
|
||||
|
||||
executeSelectionSet :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
-> Out.ObjectType m
|
||||
-> Type.Value
|
||||
-> [Path]
|
||||
-> ExecutorT m a
|
||||
executeSelectionSet selections objectType objectValue errorPath = do
|
||||
let groupedFieldSet = collectFields objectType selections
|
||||
resolvedValues <- OrderedMap.traverseMaybe go groupedFieldSet
|
||||
coerceResult (Out.NonNullObjectType objectType) $ Coerce.Object resolvedValues
|
||||
where
|
||||
executeField' fields resolver =
|
||||
executeField objectValue fields resolver errorPath
|
||||
Out.ObjectType _ _ _ resolvers = objectType
|
||||
go fields@(Field _ fieldName _ _ _ :| _) =
|
||||
traverse (executeField' fields) $ HashMap.lookup fieldName resolvers
|
||||
|
||||
fieldsSegment :: forall m. NonEmpty (Field m) -> Path
|
||||
fieldsSegment (Field alias fieldName _ _ _ :| _) =
|
||||
Segment (fromMaybe fieldName alias)
|
||||
|
||||
executeField :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Type.Value
|
||||
-> NonEmpty (Field m)
|
||||
-> Out.Resolver m
|
||||
-> [Path]
|
||||
-> ExecutorT m a
|
||||
executeField objectValue fields resolver errorPath =
|
||||
let Field _ fieldName inputArguments _ fieldLocation :| _ = fields
|
||||
in catch (go fieldName inputArguments) $ exceptionHandler fieldLocation
|
||||
where
|
||||
exceptionHandler :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Full.Location
|
||||
-> GraphQLException
|
||||
-> ExecutorT m a
|
||||
exceptionHandler fieldLocation e =
|
||||
let newError = Error (Text.pack $ displayException e) [fieldLocation] errorPath
|
||||
in ExecutorT (lift $ tell $ Seq.singleton newError) >> pure Coerce.null
|
||||
go fieldName inputArguments = do
|
||||
let (Out.Field _ fieldType argumentTypes, resolveFunction) =
|
||||
resolverField resolver
|
||||
argumentValues <- coerceArgumentValues argumentTypes inputArguments
|
||||
resolvedValue <-
|
||||
resolveFieldValue resolveFunction objectValue fieldName argumentValues
|
||||
completeValue fieldType fields errorPath resolvedValue
|
||||
resolverField (Out.ValueResolver resolverField' resolveFunction) =
|
||||
(resolverField', resolveFunction)
|
||||
resolverField (Out.EventStreamResolver resolverField' resolveFunction _) =
|
||||
(resolverField', resolveFunction)
|
||||
|
||||
resolveFieldValue :: MonadCatch m
|
||||
=> Out.Resolve m
|
||||
-> Type.Value
|
||||
-> Full.Name
|
||||
-> Type.Subs
|
||||
-> ExecutorT m Type.Value
|
||||
resolveFieldValue resolver objectValue _fieldName argumentValues =
|
||||
lift $ runReaderT resolver context
|
||||
where
|
||||
context = Type.Context
|
||||
{ Type.arguments = Type.Arguments argumentValues
|
||||
, Type.values = objectValue
|
||||
}
|
||||
|
||||
resolveAbstractType :: Monad m
|
||||
=> Type.Internal.AbstractType m
|
||||
-> Type.Subs
|
||||
-> ExecutorT m (Maybe (Out.ObjectType m))
|
||||
resolveAbstractType abstractType values'
|
||||
| Just (Type.String typeName) <- HashMap.lookup "__typename" values' = do
|
||||
types' <- ExecutorT ask
|
||||
case HashMap.lookup typeName types' of
|
||||
Just (Type.Internal.ObjectType objectType) ->
|
||||
if Type.Internal.instanceOf objectType abstractType
|
||||
then pure $ Just objectType
|
||||
else pure Nothing
|
||||
_ -> pure Nothing
|
||||
| otherwise = pure Nothing
|
||||
|
||||
completeValue :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Out.Type m
|
||||
-> NonEmpty (Field m)
|
||||
-> [Path]
|
||||
-> Type.Value
|
||||
-> ExecutorT m a
|
||||
completeValue outputType _ _ Type.Null
|
||||
| Out.isNonNullType outputType = throwFieldError NullResultError
|
||||
| otherwise = pure Coerce.null
|
||||
completeValue outputType@(Out.ListBaseType listType) fields errorPath (Type.List list)
|
||||
= foldM go (0, []) list >>= coerceResult outputType . Coerce.List . snd
|
||||
where
|
||||
go (index, accumulator) listItem = do
|
||||
let updatedPath = Index index : errorPath
|
||||
completedValue <- completeValue listType fields updatedPath listItem
|
||||
pure (index + 1, completedValue : accumulator)
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Int int) =
|
||||
coerceResult outputType $ Coerce.Int int
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Boolean boolean) =
|
||||
coerceResult outputType $ Coerce.Boolean boolean
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.Float float) =
|
||||
coerceResult outputType $ Coerce.Float float
|
||||
completeValue outputType@(Out.ScalarBaseType _) _ _ (Type.String string) =
|
||||
coerceResult outputType $ Coerce.String string
|
||||
completeValue outputType@(Out.EnumBaseType enumType) _ _ (Type.Enum enum) =
|
||||
let Type.EnumType _ _ enumMembers = enumType
|
||||
in if HashMap.member enum enumMembers
|
||||
then coerceResult outputType $ Coerce.Enum enum
|
||||
else throwFieldError EnumCompletionError
|
||||
completeValue (Out.ObjectBaseType objectType) fields errorPath result
|
||||
= executeSelectionSet (mergeSelectionSets fields) objectType result
|
||||
$ fieldsSegment fields : errorPath
|
||||
completeValue (Out.InterfaceBaseType interfaceType) fields errorPath result
|
||||
| Type.Object objectMap <- result = do
|
||||
let abstractType = Type.Internal.AbstractInterfaceType interfaceType
|
||||
concreteType <- resolveAbstractType abstractType objectMap
|
||||
case concreteType of
|
||||
Just objectType
|
||||
-> executeSelectionSet (mergeSelectionSets fields) objectType result
|
||||
$ fieldsSegment fields : errorPath
|
||||
Nothing -> throwFieldError InterfaceCompletionError
|
||||
completeValue (Out.UnionBaseType unionType) fields errorPath result
|
||||
| Type.Object objectMap <- result = do
|
||||
let abstractType = Type.Internal.AbstractUnionType unionType
|
||||
concreteType <- resolveAbstractType abstractType objectMap
|
||||
case concreteType of
|
||||
Just objectType
|
||||
-> executeSelectionSet (mergeSelectionSets fields) objectType result
|
||||
$ fieldsSegment fields : errorPath
|
||||
Nothing -> throwFieldError UnionCompletionError
|
||||
completeValue _ _ _ _ = throwFieldError ValueCompletionError
|
||||
|
||||
coerceResult :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Out.Type m
|
||||
-> Coerce.Output a
|
||||
-> ExecutorT m a
|
||||
coerceResult outputType result
|
||||
| Just serialized <- Coerce.serialize outputType result = pure serialized
|
||||
| otherwise = throwFieldError ResultCoercionError
|
||||
|
||||
mergeSelectionSets :: MonadCatch m
|
||||
=> NonEmpty (Field m)
|
||||
-> Seq (Selection m)
|
||||
mergeSelectionSets = foldr forEach mempty
|
||||
where
|
||||
forEach (Field _ _ _ fieldSelectionSet _) selectionSet' =
|
||||
selectionSet' <> fieldSelectionSet
|
||||
|
||||
throwFieldError :: MonadCatch m => FieldError -> m a
|
||||
throwFieldError = throwM . FieldException
|
||||
|
||||
coerceArgumentValues :: MonadCatch m
|
||||
=> HashMap Full.Name In.Argument
|
||||
-> HashMap Full.Name (Full.Node Input)
|
||||
-> m Type.Subs
|
||||
coerceArgumentValues argumentDefinitions argumentValues =
|
||||
HashMap.foldrWithKey c pure argumentDefinitions mempty
|
||||
where
|
||||
c argumentName argumentType pure' resultMap =
|
||||
forEach argumentName argumentType resultMap >>= pure'
|
||||
forEach :: MonadCatch m
|
||||
=> Full.Name
|
||||
-> In.Argument
|
||||
-> Type.Subs
|
||||
-> m Type.Subs
|
||||
forEach argumentName (In.Argument _ variableType defaultValue) resultMap = do
|
||||
let matchedMap
|
||||
= matchFieldValues' argumentName variableType defaultValue
|
||||
$ Just resultMap
|
||||
in case matchedMap of
|
||||
Just matchedValues -> pure matchedValues
|
||||
Nothing
|
||||
| Just _ <- HashMap.lookup argumentName argumentValues ->
|
||||
throwFieldError ArgumentTypeError
|
||||
| otherwise -> throwFieldError MissingArgumentError
|
||||
matchFieldValues' = Coerce.matchFieldValues coerceArgumentValue
|
||||
$ Full.node <$> argumentValues
|
||||
coerceArgumentValue inputType (Int integer) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Int integer)
|
||||
coerceArgumentValue inputType (Boolean boolean) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Boolean boolean)
|
||||
coerceArgumentValue inputType (String string) =
|
||||
Coerce.coerceInputLiteral inputType (Type.String string)
|
||||
coerceArgumentValue inputType (Float float) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Float float)
|
||||
coerceArgumentValue inputType (Enum enum) =
|
||||
Coerce.coerceInputLiteral inputType (Type.Enum enum)
|
||||
coerceArgumentValue inputType Null
|
||||
| In.isNonNullType inputType = Nothing
|
||||
| otherwise = Coerce.coerceInputLiteral inputType Type.Null
|
||||
coerceArgumentValue (In.ListBaseType inputType) (List list) =
|
||||
let coerceItem = coerceArgumentValue inputType
|
||||
in Type.List <$> traverse coerceItem list
|
||||
coerceArgumentValue (In.InputObjectBaseType inputType) (Object object)
|
||||
| In.InputObjectType _ _ inputFields <- inputType =
|
||||
let go = forEachField object
|
||||
resultMap = HashMap.foldrWithKey go (pure mempty) inputFields
|
||||
in Type.Object <$> resultMap
|
||||
coerceArgumentValue _ (Variable variable) = pure variable
|
||||
coerceArgumentValue _ _ = Nothing
|
||||
forEachField object variableName (In.InputField _ variableType defaultValue) =
|
||||
Coerce.matchFieldValues coerceArgumentValue object variableName variableType defaultValue
|
||||
|
||||
collectFields :: Monad m
|
||||
=> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> OrderedMap (NonEmpty (Field m))
|
||||
collectFields objectType = foldl forEach OrderedMap.empty
|
||||
where
|
||||
forEach groupedFields (FieldSelection fieldSelection) =
|
||||
let Field maybeAlias fieldName _ _ _ = fieldSelection
|
||||
responseKey = fromMaybe fieldName maybeAlias
|
||||
in OrderedMap.insert responseKey (fieldSelection :| []) groupedFields
|
||||
forEach groupedFields (FragmentSelection selectionFragment)
|
||||
| Fragment fragmentType fragmentSelectionSet _ <- selectionFragment
|
||||
, Type.Internal.doesFragmentTypeApply fragmentType objectType =
|
||||
let fragmentGroupedFieldSet =
|
||||
collectFields objectType fragmentSelectionSet
|
||||
in groupedFields <> fragmentGroupedFieldSet
|
||||
| otherwise = groupedFields
|
||||
|
||||
coerceVariableValues :: (Monad m, Coerce.VariableValue b)
|
||||
=> HashMap Full.Name (Schema.Type m)
|
||||
-> Full.OperationDefinition
|
||||
-> HashMap Full.Name b
|
||||
-> Either QueryError Type.Subs
|
||||
coerceVariableValues types operationDefinition' variableValues
|
||||
| Full.OperationDefinition _ _ variableDefinitions _ _ _ <-
|
||||
operationDefinition'
|
||||
= foldr forEach (Right HashMap.empty) variableDefinitions
|
||||
| otherwise = pure mempty
|
||||
where
|
||||
forEach variableDefinition (Right coercedValues) =
|
||||
let Full.VariableDefinition variableName variableTypeName defaultValue _ =
|
||||
variableDefinition
|
||||
defaultValue' = constValue . Full.node <$> defaultValue
|
||||
in case Type.Internal.lookupInputType variableTypeName types of
|
||||
Just variableType ->
|
||||
maybe (Left $ CoercionError variableDefinition) Right
|
||||
$ Coerce.matchFieldValues
|
||||
coerceVariableValue'
|
||||
variableValues
|
||||
variableName
|
||||
variableType
|
||||
defaultValue'
|
||||
$ Just coercedValues
|
||||
Nothing -> Left $ UnknownInputType variableDefinition
|
||||
forEach _ coercedValuesOrError = coercedValuesOrError
|
||||
coerceVariableValue' variableType value'
|
||||
= Coerce.coerceVariableValue variableType value'
|
||||
>>= Coerce.coerceInputLiteral variableType
|
||||
|
||||
constValue :: Full.ConstValue -> Type.Value
|
||||
constValue (Full.ConstInt i) = Type.Int i
|
||||
constValue (Full.ConstFloat f) = Type.Float f
|
||||
constValue (Full.ConstString x) = Type.String x
|
||||
constValue (Full.ConstBoolean b) = Type.Boolean b
|
||||
constValue Full.ConstNull = Type.Null
|
||||
constValue (Full.ConstEnum e) = Type.Enum e
|
||||
constValue (Full.ConstList list) = Type.List $ constValue . Full.node <$> list
|
||||
constValue (Full.ConstObject o) =
|
||||
Type.Object $ HashMap.fromList $ constObjectField <$> o
|
||||
where
|
||||
constObjectField Full.ObjectField{value = value', ..} =
|
||||
(name, constValue $ Full.node value')
|
||||
|
||||
type ResponseEventStream m a = ConduitT () (Response a) m ()
|
||||
|
||||
subscribe :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> Seq (Selection m)
|
||||
-> Schema m
|
||||
-> Full.Location
|
||||
-> m (Either Error (ResponseEventStream m a))
|
||||
subscribe fields schema objectLocation
|
||||
| Just objectType <- Schema.subscription schema = do
|
||||
let types' = Schema.types schema
|
||||
sourceStream <-
|
||||
createSourceEventStream types' objectType objectLocation fields
|
||||
let traverser =
|
||||
mapSourceToResponseEvent types' objectType fields
|
||||
traverse traverser sourceStream
|
||||
| otherwise = pure $ Left
|
||||
$ Error "Schema doesn't support subscriptions." [] []
|
||||
|
||||
mapSourceToResponseEvent :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> Out.SourceEventStream m
|
||||
-> m (ResponseEventStream m a)
|
||||
mapSourceToResponseEvent types' subscriptionType fields sourceStream
|
||||
= pure
|
||||
$ sourceStream
|
||||
.| mapMC (executeSubscriptionEvent types' subscriptionType fields)
|
||||
|
||||
createSourceEventStream :: MonadCatch m
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Full.Location
|
||||
-> Seq (Selection m)
|
||||
-> m (Either Error (Out.SourceEventStream m))
|
||||
createSourceEventStream _types subscriptionType objectLocation fields
|
||||
| [fieldGroup] <- OrderedMap.elems groupedFieldSet
|
||||
, Field _ fieldName arguments' _ errorLocation <- NonEmpty.head fieldGroup
|
||||
, Out.ObjectType _ _ _ fieldTypes <- subscriptionType
|
||||
, resolverT <- fieldTypes HashMap.! fieldName
|
||||
, Out.EventStreamResolver fieldDefinition _ resolver <- resolverT
|
||||
, Out.Field _ _fieldType argumentDefinitions <- fieldDefinition =
|
||||
case coerceArgumentValues argumentDefinitions arguments' of
|
||||
Left _ -> pure
|
||||
$ Left
|
||||
$ Error "Argument coercion failed." [errorLocation] []
|
||||
Right argumentValues -> left (singleError' [errorLocation])
|
||||
<$> resolveFieldEventStream Type.Null argumentValues resolver
|
||||
| otherwise = pure
|
||||
$ Left
|
||||
$ Error "Subscription contains more than one field." [objectLocation] []
|
||||
where
|
||||
groupedFieldSet = collectFields subscriptionType fields
|
||||
|
||||
singleError' :: [Full.Location] -> String -> Error
|
||||
singleError' errorLocations message = Error (Text.pack message) errorLocations []
|
||||
|
||||
resolveFieldEventStream :: MonadCatch m
|
||||
=> Type.Value
|
||||
-> Type.Subs
|
||||
-> Out.Subscribe m
|
||||
-> m (Either String (Out.SourceEventStream m))
|
||||
resolveFieldEventStream result args resolver =
|
||||
catch (Right <$> runReaderT resolver context) handleEventStreamError
|
||||
where
|
||||
handleEventStreamError :: MonadCatch m
|
||||
=> ResolverException
|
||||
-> m (Either String (Out.SourceEventStream m))
|
||||
handleEventStreamError = pure . Left . displayException
|
||||
context = Type.Context
|
||||
{ Type.arguments = Type.Arguments args
|
||||
, Type.values = result
|
||||
}
|
||||
|
||||
executeSubscriptionEvent :: (MonadCatch m, Coerce.Serialize a)
|
||||
=> HashMap Full.Name (Type m)
|
||||
-> Out.ObjectType m
|
||||
-> Seq (Selection m)
|
||||
-> Type.Value
|
||||
-> m (Response a)
|
||||
executeSubscriptionEvent types' objectType fields initialValue = do
|
||||
(data', errors) <- runWriterT
|
||||
$ flip runReaderT types'
|
||||
$ runExecutorT
|
||||
$ executeSelectionSet fields objectType initialValue []
|
||||
pure $ Response data' errors
|
||||
@@ -1,4 +1,5 @@
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE Safe #-}
|
||||
|
||||
-- | Types that can be used as both input and output types.
|
||||
module Language.GraphQL.Type.Definition
|
||||
|
||||
@@ -3,6 +3,7 @@
|
||||
obtain one at https://mozilla.org/MPL/2.0/. -}
|
||||
|
||||
{-# LANGUAGE PatternSynonyms #-}
|
||||
{-# LANGUAGE Safe #-}
|
||||
{-# LANGUAGE ViewPatterns #-}
|
||||
|
||||
-- | Input types and values.
|
||||
|
||||
Reference in New Issue
Block a user