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Provide error information for variable definitions

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This commit is contained in:
Eugen Wissner 2021-08-18 15:04:12 +02:00
parent f527b61a3d
commit d7422e46ca
1 changed files with 47 additions and 24 deletions
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71
src/Language/GraphQL/Executor.hs
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@ -43,19 +43,40 @@ data Response = Response
data QueryError
= OperationNameRequired
| OperationNotFound String
| CoercionError
| CoercionError Full.VariableDefinition
| UnknownInputType Full.VariableDefinition
instance Show QueryError where
show OperationNameRequired = "Operation name is required."
show (OperationNotFound operationName) =
concat ["Operation \"", operationName, "\" not found."]
show CoercionError = "Coercion error."
queryError :: QueryError -> Error
queryError OperationNameRequired =
Error{ message = "Operation name is required.", locations = [], path = [] }
queryError (OperationNotFound operationName) =
let queryErrorMessage = concat
[ "Operation \""
, operationName
, "\" not found."
]
in Error{ message = queryErrorMessage, locations = [], path = [] }
queryError (CoercionError variableDefinition) =
let Full.VariableDefinition variableName _ _ location = variableDefinition
queryErrorMessage = concat
[ "Failed to coerce the variable \""
, Text.unpack variableName
, "\"."
]
in Error{ message = queryErrorMessage, locations = [location], path = [] }
queryError (UnknownInputType variableDefinition) =
let Full.VariableDefinition variableName variableTypeName _ location = variableDefinition
queryErrorMessage = concat
[ "Variable \""
, Text.unpack variableName
, "\" has unknown type \""
, show variableTypeName
, "\"."
]
in Error{ message = queryErrorMessage, locations = [location], path = [] }
respondWithQueryError :: QueryError -> Response
respondWithQueryError queryError
= Response mempty
$ pure
$ Error{ message = show queryError, locations = [], path = [] }
respondWithQueryError = Response mempty . pure . queryError
-- operationName selectionSet location
data Operation = Operation
@ -91,7 +112,7 @@ executeRequest _schema sourceDocument operationName _variableValues _initialValu
let transformedDocument = document sourceDocument
operation = getOperation transformedDocument operationName
in case operation of
Left queryError -> pure $ respondWithQueryError queryError
Left queryError' -> pure $ respondWithQueryError queryError'
Right (Operation Full.Query _ _ _ _) -> executeQuery
Right (Operation Full.Mutation _ _ _ _) -> executeMutation
Right (Operation Full.Subscription _ _ _ _) -> subscribe
@ -124,22 +145,24 @@ coerceVariableValues :: Coerce.VariableValue a
-> Either QueryError Type.Subs
coerceVariableValues types operationDefinition' variableValues =
let Operation _ _ variableDefinitions _ _ = operationDefinition'
in maybe (Left CoercionError) Right
$ foldr forEach (Just HashMap.empty) variableDefinitions
in foldr forEach (Right HashMap.empty) variableDefinitions
where
forEach variableDefinition coercedValues = do
forEach variableDefinition (Right coercedValues) =
let Full.VariableDefinition variableName variableTypeName defaultValue _ =
variableDefinition
let defaultValue' = constValue . Full.node <$> defaultValue
variableType <- Type.Internal.lookupInputType variableTypeName types
Coerce.matchFieldValues
coerceVariableValue'
variableValues
variableName
variableType
defaultValue'
coercedValues
defaultValue' = constValue . Full.node <$> 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