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3 Commits
Author | SHA1 | Date |
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Eugen Wissner | 5306730ff8 | |
Eugen Wissner | 92463f7c4a | |
Eugen Wissner | 53ce65d713 |
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@ -6,7 +6,14 @@ The format is based on
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and this project adheres to
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[Haskell Package Versioning Policy](https://pvp.haskell.org/).
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## [1.0.0.0] - 2022-03-29
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## [1.0.1.0] - 2023-02-17
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### Added
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- `ToGraphQL` and `FromGraphQL` typeclasses with instances for basic types.
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- `Resolver` module with `argument` and `defaultResolver` helper functions.
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## 1.0.0.0 - 2022-03-29
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### Added
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- JSON serialization.
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- Test helpers.
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[1.0.1.0]: https://www.caraus.tech/projects/pub-graphql-spice/repository/28/diff?rev=v1.0.1.0&rev_to=v1.0.0.0
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@ -1,7 +1,7 @@
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cabal-version: 2.4
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name: graphql-spice
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version: 1.0.0.0
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version: 1.0.1.0
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synopsis: GraphQL with batteries
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description: Various extensions and convenience functions for the core
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graphql package.
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@ -10,13 +10,13 @@ homepage: https://www.caraus.tech/projects/pub-graphql-spice
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bug-reports: https://www.caraus.tech/projects/pub-graphql-spice/issues
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author: Eugen Wissner <belka@caraus.de>
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maintainer: belka@caraus.de
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copyright: (c) 2021-2022 Eugen Wissner
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copyright: (c) 2021-2023 Eugen Wissner
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license: MPL-2.0
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license-files: LICENSE
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build-type: Simple
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extra-source-files: CHANGELOG.md
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tested-with:
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GHC == 8.10.7
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GHC == 9.2.5
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source-repository head
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type: git
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@ -24,7 +24,9 @@ source-repository head
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library
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exposed-modules:
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Language.GraphQL.JSON,
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Language.GraphQL.Class
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Language.GraphQL.JSON
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Language.GraphQL.Resolver
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Test.Hspec.GraphQL
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other-modules:
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hs-source-dirs: src
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@ -36,10 +38,11 @@ library
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containers ^>= 0.6.2,
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exceptions ^>= 0.10.4,
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hspec-expectations >= 0.8.2 && < 0.9,
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graphql ^>= 1.0.3.0,
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graphql >= 1.0,
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megaparsec >= 9.0 && < 10,
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scientific ^>= 0.3.7,
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text >= 1.2 && < 3,
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transformers ^>= 0.5.6,
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vector ^>= 0.12.3,
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unordered-containers ^>= 0.2.16
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default-language: Haskell2010
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@ -48,6 +51,7 @@ test-suite graphql-test
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type: exitcode-stdio-1.0
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main-is: Spec.hs
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other-modules:
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Language.GraphQL.ClassSpec
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Language.GraphQL.CoerceSpec
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Language.GraphQL.DirectiveSpec
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Language.GraphQL.FragmentSpec
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@ -0,0 +1,105 @@
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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 OverloadedStrings #-}
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-- | ToGraphQL and FromGraphQL typeclasses used for user-defined type
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-- conversion.
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module Language.GraphQL.Class
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( FromGraphQL(..)
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, ToGraphQL(..)
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) where
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import Data.Foldable (toList)
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import Data.Int (Int8, Int16, Int32, Int64)
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import Data.Text (Text)
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import qualified Data.Text.Read as Text.Read
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import Data.Vector (Vector)
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import qualified Data.Vector as Vector
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import qualified Language.GraphQL.Type as Type
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fromGraphQLToIntegral :: Integral a => Type.Value -> Maybe a
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fromGraphQLToIntegral (Type.Int value) = Just $ fromIntegral value
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fromGraphQLToIntegral (Type.String value) =
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case Text.Read.decimal value of
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Right (converted, "") -> Just converted
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_conversionError -> Nothing
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fromGraphQLToIntegral _ = Nothing
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-- | Instances of this typeclass can be converted to GraphQL internal
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-- representation.
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class ToGraphQL a where
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toGraphQL :: a -> Type.Value
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instance ToGraphQL Text where
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toGraphQL = Type.String
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instance ToGraphQL Int where
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toGraphQL = Type.Int . fromIntegral
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instance ToGraphQL Int8 where
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toGraphQL = Type.Int . fromIntegral
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instance ToGraphQL Int16 where
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toGraphQL = Type.Int . fromIntegral
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instance ToGraphQL Int32 where
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toGraphQL = Type.Int
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instance ToGraphQL Int64 where
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toGraphQL = Type.Int . fromIntegral
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instance ToGraphQL a => ToGraphQL [a] where
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toGraphQL = Type.List . fmap toGraphQL
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instance ToGraphQL a => ToGraphQL (Vector a) where
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toGraphQL = Type.List . toList . fmap toGraphQL
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instance ToGraphQL a => ToGraphQL (Maybe a) where
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toGraphQL (Just justValue) = toGraphQL justValue
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toGraphQL Nothing = Type.Null
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instance ToGraphQL Bool where
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toGraphQL = Type.Boolean
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-- | Instances of this typeclass can be used to convert GraphQL internal
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-- representation to user-defined type.
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class FromGraphQL a where
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fromGraphQL :: Type.Value -> Maybe a
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instance FromGraphQL Text where
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fromGraphQL (Type.String value) = Just value
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fromGraphQL _ = Nothing
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instance FromGraphQL Int where
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fromGraphQL = fromGraphQLToIntegral
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instance FromGraphQL Int8 where
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fromGraphQL = fromGraphQLToIntegral
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instance FromGraphQL Int16 where
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fromGraphQL = fromGraphQLToIntegral
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instance FromGraphQL Int32 where
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fromGraphQL = fromGraphQLToIntegral
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instance FromGraphQL Int64 where
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fromGraphQL = fromGraphQLToIntegral
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instance FromGraphQL a => FromGraphQL [a] where
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fromGraphQL (Type.List value) = traverse fromGraphQL value
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fromGraphQL _ = Nothing
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instance FromGraphQL a => FromGraphQL (Vector a) where
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fromGraphQL (Type.List value) = Vector.fromList
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<$> traverse fromGraphQL value
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fromGraphQL _ = Nothing
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instance FromGraphQL a => FromGraphQL (Maybe a) where
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fromGraphQL Type.Null = Just Nothing
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fromGraphQL value = Just <$> fromGraphQL value
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instance FromGraphQL Bool where
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fromGraphQL (Type.Boolean value) = Just value
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fromGraphQL _ = Nothing
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@ -0,0 +1,61 @@
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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 OverloadedStrings #-}
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-- | Helper functions and exceptions to write resolvers.
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module Language.GraphQL.Resolver
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( argument
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, defaultResolver
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) where
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import Control.Monad.Catch (Exception(..), MonadCatch(..), MonadThrow(..))
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import Control.Monad.Trans.Reader (ReaderT, asks)
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import Data.HashMap.Strict ((!))
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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 Language.GraphQL.AST.Document (Name)
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import Language.GraphQL.Error
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import qualified Language.GraphQL.Type as Type
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import Language.GraphQL.Class (FromGraphQL(..))
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-- | Exceptions thrown by the functions in this module.
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data ServerException
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= FieldNotResolvedException !Text
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| ErroneousArgumentTypeException !Text
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instance Show ServerException where
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show (FieldNotResolvedException fieldName) =
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Text.unpack $ Text.unwords ["Field", fieldName, "not resolved."]
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show (ErroneousArgumentTypeException argumentName) =
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Text.unpack $ Text.unwords
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[ "Unable to convert the argument"
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, argumentName
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, "to a user-defined type."
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]
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instance Exception ServerException where
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toException = toException . ResolverException
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fromException x = do
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ResolverException a <- fromException x
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cast a
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-- | Default resolver expects that the field value is returned by the parent
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-- object. If the parent is not an object or it doesn't contain the requested
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-- field name, an error is thrown.
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defaultResolver :: MonadCatch m => Name -> Type.Resolve m
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defaultResolver fieldName = do
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values' <- asks Type.values
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case values' of
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Type.Object objectValue -> pure $ objectValue ! fieldName
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_nonObject -> throwM $ FieldNotResolvedException fieldName
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-- | Takes an argument name, validates that the argument exists, and optionally
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-- converts it to a user-defined type.
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argument :: (MonadCatch m, FromGraphQL a) => Name -> ReaderT Type.Context m a
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argument argumentName =
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Type.argument argumentName >>= maybe throwError pure . fromGraphQL
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where
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throwError = throwM $ ErroneousArgumentTypeException argumentName
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@ -0,0 +1,47 @@
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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 OverloadedStrings #-}
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module Language.GraphQL.ClassSpec
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( spec
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) where
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import Data.Text (Text)
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import qualified Language.GraphQL.Type as Type
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import Language.GraphQL.Class (FromGraphQL(..), ToGraphQL(..))
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import Test.Hspec (Spec, describe, it, shouldBe)
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spec :: Spec
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spec = do
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describe "ToGraphQL" $ do
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it "converts integers" $
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toGraphQL (5 :: Int) `shouldBe` Type.Int 5
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it "converts text" $
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toGraphQL ("String" :: Text) `shouldBe` Type.String "String"
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it "converts booleans" $
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toGraphQL True `shouldBe` Type.Boolean True
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it "converts Nothing to Null" $
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toGraphQL (Nothing :: Maybe Int) `shouldBe` Type.Null
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it "converts singleton lists" $
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toGraphQL [True] `shouldBe` Type.List [Type.Boolean True]
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describe "FromGraphQL" $ do
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it "converts integers" $
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fromGraphQL (Type.Int 5) `shouldBe` Just (5 :: Int)
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it "converts text" $
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fromGraphQL (Type.String "String") `shouldBe` Just ("String" :: Text)
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it "converts booleans" $
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fromGraphQL (Type.Boolean True) `shouldBe` Just True
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it "converts Null to Nothing" $
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fromGraphQL Type.Null `shouldBe` Just (Nothing :: Maybe Int)
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it "converts singleton lists" $
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fromGraphQL (Type.List [Type.Boolean True]) `shouldBe` Just [True]
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