Show the value and expected type in value completion errors

This commit is contained in:
Eugen Wissner 2021-08-31 17:18:48 +02:00
parent c7e586a125
commit c0d41a56ce

View File

@ -1,71 +1,861 @@
{-# LANGUAGE ExplicitForAll #-} {- 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 #-}
-- | This module provides functions to execute a @GraphQL@ request.
module Language.GraphQL.Execute module Language.GraphQL.Execute
( execute ( Error(..)
, module Language.GraphQL.Execute.Coerce , Operation(..)
) where , Path(..)
, Response(..)
, execute
) where
import Control.Monad.Catch (MonadCatch) import Conduit (mapMC, (.|))
import Data.HashMap.Strict (HashMap) import Control.Arrow (left)
import Data.Sequence (Seq(..)) import Control.Monad.Catch
import Data.Text (Text) ( 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 qualified Language.GraphQL.AST.Document as Full
import Language.GraphQL.Execute.Coerce import Data.Bifunctor (first)
import Language.GraphQL.Execute.Execution import Data.Foldable (find)
import Language.GraphQL.Execute.Internal import Data.Functor ((<&>))
import qualified Language.GraphQL.Execute.Transform as Transform import Data.HashMap.Strict (HashMap)
import qualified Language.GraphQL.Execute.Subscribe as Subscribe import qualified Data.HashMap.Strict as HashMap
import Language.GraphQL.Error import Data.HashSet (HashSet)
( Error import qualified Data.HashSet as HashSet
, ResponseEventStream import Data.Int (Int32)
, Response(..) import Data.List.NonEmpty (NonEmpty(..))
, runCollectErrs import qualified Data.List.NonEmpty as NonEmpty
) import Data.Maybe (fromMaybe, isJust)
import qualified Language.GraphQL.Type.Definition as Definition 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.Out as Out
import Language.GraphQL.Type.Schema import qualified Language.GraphQL.Type as Type
import Prelude hiding (null) 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(..)
, ResponseEventStream
)
-- | The substitution is applied to the document, and the resolvers are applied data Replacement m = Replacement
-- to the resulting fields. The operation name can be used if the document { variableValues :: Type.Subs
-- defines multiple root operations. , fragmentDefinitions :: HashMap Full.Name Full.FragmentDefinition
-- , visitedFragments :: HashSet Full.Name
-- Returns the result of the query against the schema wrapped in a /data/ , types :: HashMap Full.Name (Type m)
-- field, or errors wrapped in an /errors/ field. }
execute :: (MonadCatch m, VariableValue a, Serialize b)
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
| ResultCoercionError
| NullResultError
instance Show FieldError where
show ArgumentTypeError = "Invalid argument type."
show MissingArgumentError = "Required argument not specified."
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 ValueCompletionException = ValueCompletionException String Type.Value
instance Show ValueCompletionException where
show (ValueCompletionException typeRepresentation found) = concat
[ "Value completion error. Expected type "
, typeRepresentation
, ", found: "
, show found
, "."
]
instance Exception ValueCompletionException 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 <$> input node' <*> pure location
execute :: (MonadCatch m, Coerce.VariableValue a, Coerce.Serialize b)
=> Schema m -- ^ Resolvers. => Schema m -- ^ Resolvers.
-> Maybe Text -- ^ Operation name. -> Maybe Text -- ^ Operation name.
-> HashMap Full.Name a -- ^ Variable substitution function. -> HashMap Full.Name a -- ^ Variable substitution function.
-> Full.Document -- @GraphQL@ document. -> Full.Document -- @GraphQL@ document.
-> m (Either (ResponseEventStream m b) (Response b)) -> m (Either (ResponseEventStream m b) (Response b))
execute schema' operationName subs document execute schema' operationName subs document' =
= either (pure . rightErrorResponse . singleError [] . show) executeRequest executeRequest schema' document' (Text.unpack <$> operationName) subs
$ Transform.document schema' operationName subs document
executeRequest :: (MonadCatch m, Serialize a) executeRequest :: (MonadCatch m, Coerce.Serialize a, Coerce.VariableValue b)
=> Transform.Document m => Schema m
-> Full.Document
-> Maybe String
-> HashMap Full.Name b
-> m (Either (ResponseEventStream m a) (Response a)) -> m (Either (ResponseEventStream m a) (Response a))
executeRequest (Transform.Document types' rootObjectType operation) executeRequest schema sourceDocument operationName variableValues = do
| (Transform.Query _ fields objectLocation) <- operation = operationAndVariables <- sequence buildOperation
Right <$> executeOperation types' rootObjectType objectLocation fields case operationAndVariables of
| (Transform.Mutation _ fields objectLocation) <- operation = Left queryError' -> pure
Right <$> executeOperation types' rootObjectType objectLocation fields $ Right
| (Transform.Subscription _ fields objectLocation) <- operation $ Response Coerce.null $ pure $ queryError queryError'
= either rightErrorResponse Left Right operation
<$> Subscribe.subscribe types' rootObjectType objectLocation fields | Operation Full.Query topSelections _operationLocation <- operation ->
Right <$> 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 rightErrorResponse :: Coerce.Serialize b => forall a. Error -> Either a (Response b)
-- and mutations yet. rightErrorResponse = Right . Response Coerce.null . pure
executeOperation :: (MonadCatch m, Serialize a)
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) => HashMap Full.Name (Type m)
-> Out.ObjectType m -> Out.ObjectType m
-> Full.Location -> Full.Location
-> Seq (Transform.Selection m) -> Seq (Selection m)
-> m (Response a) -> m (Either Error (Out.SourceEventStream m))
executeOperation types' objectType objectLocation fields createSourceEventStream _types subscriptionType objectLocation fields
= runCollectErrs types' | [fieldGroup] <- OrderedMap.elems groupedFieldSet
$ executeSelectionSet Definition.Null objectType objectLocation fields , 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) singleError' :: [Full.Location] -> String -> Error
rightErrorResponse = Right . Response null . pure 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