Show the value and expected type in value completion errors
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@ -1,71 +1,861 @@
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{-# LANGUAGE ExplicitForAll #-}
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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 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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-- | This module provides functions to execute a @GraphQL@ request.
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module Language.GraphQL.Execute
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( execute
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, module Language.GraphQL.Execute.Coerce
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) where
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( Error(..)
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, Operation(..)
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, Path(..)
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, Response(..)
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, execute
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) where
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import Control.Monad.Catch (MonadCatch)
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import Data.HashMap.Strict (HashMap)
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import Data.Sequence (Seq(..))
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import Data.Text (Text)
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import Conduit (mapMC, (.|))
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import Control.Arrow (left)
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import Control.Monad.Catch
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( Exception(..)
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, MonadCatch(..)
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, MonadThrow(..)
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, SomeException(..)
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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 (foldM)
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import qualified Language.GraphQL.AST.Document as Full
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import Language.GraphQL.Execute.Coerce
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import Language.GraphQL.Execute.Execution
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import Language.GraphQL.Execute.Internal
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import qualified Language.GraphQL.Execute.Transform as Transform
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import qualified Language.GraphQL.Execute.Subscribe as Subscribe
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import Language.GraphQL.Error
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( Error
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, ResponseEventStream
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, Response(..)
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, runCollectErrs
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)
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import qualified Language.GraphQL.Type.Definition as Definition
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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.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 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 qualified Language.GraphQL.Execute.Coerce as 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.Type.In as In
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import qualified Language.GraphQL.Type.Out as Out
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import Language.GraphQL.Type.Schema
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import Prelude hiding (null)
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import qualified Language.GraphQL.Type as Type
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import qualified Language.GraphQL.Type.Internal as Type.Internal
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import Language.GraphQL.Type.Schema (Schema, Type)
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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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-- | The substitution is applied to the document, and the resolvers are applied
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-- to the resulting fields. The operation name can be used if the document
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-- defines multiple root operations.
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--
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-- Returns the result of the query against the schema wrapped in a /data/
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-- field, or errors wrapped in an /errors/ field.
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execute :: (MonadCatch m, VariableValue a, Serialize b)
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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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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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}
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instance Functor m => Functor (ExecutorT m) where
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fmap f = ExecutorT . fmap f . runExecutorT
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instance Applicative m => Applicative (ExecutorT m) where
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pure = ExecutorT . pure
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ExecutorT f <*> ExecutorT x = ExecutorT $ f <*> x
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instance Monad m => Monad (ExecutorT m) where
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ExecutorT x >>= f = ExecutorT $ x >>= runExecutorT . f
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instance MonadTrans ExecutorT where
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lift = ExecutorT . lift . lift
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instance MonadThrow m => MonadThrow (ExecutorT m) where
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throwM = lift . throwM
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instance MonadCatch m => MonadCatch (ExecutorT m) where
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catch (ExecutorT stack) handler =
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ExecutorT $ catch stack $ runExecutorT . handler
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data GraphQLException = forall e. Exception e => GraphQLException e
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instance Show GraphQLException where
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show (GraphQLException e) = show e
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instance Exception GraphQLException
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graphQLExceptionToException :: Exception e => e -> SomeException
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graphQLExceptionToException = toException . GraphQLException
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graphQLExceptionFromException :: Exception e => SomeException -> Maybe e
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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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instance Show ResolverException where
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show (ResolverException e) = show e
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instance Exception ResolverException where
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toException = graphQLExceptionToException
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fromException = graphQLExceptionFromException
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data FieldError
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= ArgumentTypeError
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| MissingArgumentError
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| ResultCoercionError
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| NullResultError
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instance Show FieldError where
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show ArgumentTypeError = "Invalid argument type."
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show MissingArgumentError = "Required argument not specified."
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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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newtype FieldException = FieldException FieldError
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deriving Show
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instance Exception FieldException where
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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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instance Show ValueCompletionException where
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show (ValueCompletionException typeRepresentation found) = concat
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[ "Value completion error. Expected type "
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, typeRepresentation
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, ", found: "
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, show found
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, "."
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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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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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asks :: Monad m => forall a. (Replacement m -> a) -> TransformT m a
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asks = TransformT . Reader.asks
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queryError :: QueryError -> Error
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queryError OperationNameRequired =
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Error{ message = "Operation name is required.", locations = [], path = [] }
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queryError (OperationNotFound operationName) =
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let queryErrorMessage = Text.concat
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[ "Operation \""
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, Text.pack operationName
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, "\" not found."
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]
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in Error{ message = queryErrorMessage, locations = [], path = [] }
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queryError (CoercionError variableDefinition) =
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let Full.VariableDefinition variableName _ _ location = variableDefinition
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queryErrorMessage = Text.concat
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[ "Failed to coerce the variable \""
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, variableName
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, "\"."
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]
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in Error{ message = queryErrorMessage, locations = [location], path = [] }
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queryError (UnknownInputType variableDefinition) =
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let Full.VariableDefinition variableName variableTypeName _ location = variableDefinition
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queryErrorMessage = Text.concat
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[ "Variable \""
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, variableName
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, "\" has unknown type \""
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, Text.pack $ show variableTypeName
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, "\"."
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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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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 _) = do
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argumentValue <- 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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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 <$> input node' <*> pure location
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execute :: (MonadCatch m, Coerce.VariableValue a, Coerce.Serialize b)
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=> Schema m -- ^ Resolvers.
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-> Maybe Text -- ^ Operation name.
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-> HashMap Full.Name a -- ^ Variable substitution function.
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-> Full.Document -- @GraphQL@ document.
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-> m (Either (ResponseEventStream m b) (Response b))
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execute schema' operationName subs document
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= either (pure . rightErrorResponse . singleError [] . show) executeRequest
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$ Transform.document schema' operationName subs document
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execute schema' operationName subs document' =
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executeRequest schema' document' (Text.unpack <$> operationName) subs
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executeRequest :: (MonadCatch m, Serialize a)
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=> Transform.Document m
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executeRequest :: (MonadCatch m, Coerce.Serialize a, Coerce.VariableValue b)
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=> Schema m
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-> Full.Document
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-> Maybe String
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-> HashMap Full.Name b
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-> m (Either (ResponseEventStream m a) (Response a))
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executeRequest (Transform.Document types' rootObjectType operation)
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| (Transform.Query _ fields objectLocation) <- operation =
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Right <$> executeOperation types' rootObjectType objectLocation fields
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| (Transform.Mutation _ fields objectLocation) <- operation =
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Right <$> executeOperation types' rootObjectType objectLocation fields
|
||||
| (Transform.Subscription _ fields objectLocation) <- operation
|
||||
= either rightErrorResponse Left
|
||||
<$> Subscribe.subscribe types' rootObjectType objectLocation fields
|
||||
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
|
||||
|
||||
-- This is actually executeMutation, but we don't distinguish between queries
|
||||
-- and mutations yet.
|
||||
executeOperation :: (MonadCatch m, Serialize a)
|
||||
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 throwM
|
||||
$ ValueCompletionException (show outputType)
|
||||
$ Type.Enum enum
|
||||
completeValue (Out.ObjectBaseType objectType) fields errorPath result
|
||||
= executeSelectionSet (mergeSelectionSets fields) objectType result
|
||||
$ fieldsSegment fields : errorPath
|
||||
completeValue outputType@(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 -> throwM
|
||||
$ ValueCompletionException (show outputType) result
|
||||
completeValue outputType@(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 -> throwM
|
||||
$ ValueCompletionException (show outputType) result
|
||||
completeValue outputType _ _ result =
|
||||
throwM $ ValueCompletionException (show outputType) result
|
||||
|
||||
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')
|
||||
|
||||
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 (Transform.Selection m)
|
||||
-> m (Response a)
|
||||
executeOperation types' objectType objectLocation fields
|
||||
= runCollectErrs types'
|
||||
$ executeSelectionSet Definition.Null objectType objectLocation fields
|
||||
-> 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
|
||||
|
||||
rightErrorResponse :: Serialize b => forall a. Error -> Either a (Response b)
|
||||
rightErrorResponse = Right . Response null . pure
|
||||
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
|
||||
|
|
|
|||
Loading…
Reference in New Issue