Rough implementation of execute
The first end-to-end test taken from `graphql-js` passes but this still needs to be extended to support more general cases. - `Data.GraphQL.Schema` has been heavily modified to support the execution model. More drastic changes are expected in this module. - When defining a `Schema` ordinary functions taking fields as input are being used instead of maps. This makes the implementation of `execute` easier, and, arguably, makes `Schema` definitions more *Haskellish*. - Drop explicit `unordered-containers` dependency. `Aeson.Value`s and field functions should be good enough for now.
This commit is contained in:
Danny Navarro
@ -1,13 +1,15 @@
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE OverloadedLists #-}
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{-# LANGUAGE RecordWildCards #-}
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module Test.StarWars where
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import Data.Functor.Identity (Identity(..))
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import Control.Applicative ((<|>), liftA2)
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import Data.Maybe (catMaybes)
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-- import Data.Functor.Identity (Identity(..))
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import Data.Text (Text)
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import Data.Attoparsec.Text (parseOnly)
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-- import Data.Aeson (ToJSON(toJSON), genericToJSON, defaultOptions)
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import qualified Data.Aeson as Aeson
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import Data.Attoparsec.Text (parseOnly)
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import Test.Tasty (TestTree)
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import Test.Tasty.HUnit
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@ -17,119 +19,106 @@ import Data.GraphQL.Execute
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import qualified Data.GraphQL.Parser as Parser
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import Data.GraphQL.Schema
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-- * Test
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsQueryTests.js
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test :: TestTree
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test = testCase "R2-D2" $ execute schema heroQuery @=? Identity expected
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test = testCase "R2-D2" $ execute schema heroQuery @?= expected
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where
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heroQuery :: Document
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heroQuery = either (error "Parsing error") id $ parseOnly Parser.document
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"{ query HeroNameQuery { hero { name } } }"
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"query HeroNameQuery{hero{name}}"
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expected :: Response
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expected = Aeson.Object
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[ ( "hero" , Aeson.Object [ ("name", "R2-D2") ] ) ]
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expected :: Maybe Response
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expected = Just $ Aeson.Object [("hero", Aeson.Object [("name", "R2-D2")])]
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-- * Schema
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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type ID = Text
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schema :: Applicative f => Schema f
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schema = Schema query Nothing
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schema :: Schema
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schema = Schema query
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query :: Applicative f => QueryRoot f
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query = [ ("hero", hero)
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, ("human", human)
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, ("droid", droid)
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]
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query :: QueryRoot
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query (InputField "hero") = OutputResolver hero
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query (InputField "human") = OutputResolver human
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query (InputField "droid") = OutputResolver droid
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query _ = OutputError
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hero :: Applicative f => Resolver f
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hero (InputScalar (ScalarInt ep)) = OutputMap $ getHeroF ep
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hero _ = InputError
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hero :: Resolver
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hero (InputList (InputScalar (ScalarInt ep) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getHero ep
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hero (InputField fld) = characterOutput fld artoo
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hero _ = OutputError
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human :: Applicative f => Resolver f
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human (InputScalar (ScalarString id_)) = OutputScalar $ ScalarString <$> getHumanF id_
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human _ = InputError
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human :: Resolver
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human (InputList (InputScalar (ScalarID i) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getHuman i
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human _ = OutputError
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droid :: Applicative f => Resolver f
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droid (InputScalar (ScalarString id_)) = OutputScalar $ ScalarString <$> getDroidF id_
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droid _ = InputError
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droid :: Resolver
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droid (InputList (InputScalar (ScalarID i) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getDroid i
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droid _ = OutputError
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characterOutput :: Text -> Character -> Output
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characterOutput "id" char = OutputScalar . ScalarString $ id_ char
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characterOutput "name" char = OutputScalar . ScalarString $ name char
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characterOutput "friends" char = OutputList $ OutputResolver . (\c (InputField f) -> characterOutput f c) <$> getFriends char
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characterOutput _ _ = OutputError
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-- * Data
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsData.js
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-- ** Characters
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data Character = Character
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{ id_ :: ID
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, name :: Text
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, friends :: [ID]
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, appearsIn :: [Int]
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{ id_ :: ID
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, name :: Text
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, friends :: [ID]
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, appearsIn :: [Int]
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, homePlanet :: Text
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}
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} deriving (Show)
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luke :: Character
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luke = Character
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{ id_ = "1000"
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, name = "Luke Skywalker"
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, friends = ["1002","1003","2000","2001"]
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, appearsIn = [4,5,6]
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{ id_ = "1000"
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, name = "Luke Skywalker"
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, friends = ["1002","1003","2000","2001"]
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, appearsIn = [4,5,6]
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, homePlanet = "Tatoonie"
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}
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artoo :: Character
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artoo = Character
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{ id_ = "2001"
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, name = "R2-D2"
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, friends = ["1000","1002","1003"]
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, appearsIn = [4,5,6]
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{ id_ = "2001"
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, name = "R2-D2"
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, friends = ["1000","1002","1003"]
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, appearsIn = [4,5,6]
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, homePlanet = "Astrometch"
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}
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type CharacterMap f = Map f
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-- ** Helper functions
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character :: Applicative f => Character -> CharacterMap f
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character (Character{..}) =
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[ ("id_", const . OutputScalar . pure $ ScalarID id_)
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, ("name", const . OutputScalar . pure $ ScalarString name)
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, ("friends", const . OutputList $ OutputScalar . pure . ScalarID <$> friends)
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, ("appearsIn", const . OutputList $ OutputScalar . pure . ScalarInt <$> appearsIn)
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, ("homePlanet", const . OutputScalar . pure $ ScalarString homePlanet)
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]
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getHero :: Int -> Maybe Character
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getHero 5 = Just luke
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getHero _ = Just artoo
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-- ** Hero
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getHuman :: ID -> Maybe Character
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getHuman "1000" = Just luke
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-- getHuman "1001" = "vader"
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-- getHuman "1002" = "han"
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-- getHuman "1003" = "leia"
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-- getHuman "1004" = "tarkin"
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getHuman _ = Nothing
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getHero :: Int -> Character
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getHero 5 = luke
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getHero _ = artoo
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getDroid :: ID -> Maybe Character
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-- getDroid "2000" = "threepio"
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getDroid "2001" = Just artoo
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getDroid _ = Nothing
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getHeroF :: Applicative f => Int -> CharacterMap f
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getHeroF = character . getHero
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-- ** Human
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getHuman :: ID -> Text
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getHuman "1000" = "luke"
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getHuman "1001" = "vader"
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getHuman "1002" = "han"
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getHuman "1003" = "leia"
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getHuman "1004" = "tarkin"
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getHuman _ = ""
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getHumanF :: Applicative f => ID -> f Text
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getHumanF = pure . getHuman
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getHumanIO :: ID -> IO Text
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getHumanIO = getHumanF
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-- ** Droid
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getDroid :: ID -> Text
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getDroid "2000" = "threepio"
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getDroid "2001" = "artoo"
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getDroid _ = ""
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getDroidF :: Applicative f => ID -> f Text
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getDroidF = pure . getDroid
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getDroidIO :: ID -> IO Text
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getDroidIO = getDroidF
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getFriends :: Character -> [Character]
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getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
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