Eugen Wissner
ae2210f659
This is experimental support. The implementation is based on conduit and is boring. There is a new resolver data constructor that should create a source event stream. The executor receives the events, pipes them through the normal execution and puts them into the response stream which is returned to the user. - Tests are missing. - The executor should check field value resolver on subscription types. - The graphql function should probably return (Either ResponseEventStream Response), but I'm not sure about this. It will make the usage more complicated if no subscriptions are involved, but with the current API implementing subscriptions is more difficult than it should be.
191 lines
4.0 KiB
Haskell
191 lines
4.0 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Test.StarWars.Data
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( Character
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, appearsIn
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, artoo
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, getDroid
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, getDroid'
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, getEpisode
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, getFriends
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, getHero
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, getHuman
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, id_
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, homePlanet
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, name_
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, secretBackstory
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, typeName
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) where
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import Data.Functor.Identity (Identity)
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import Control.Applicative (Alternative(..), liftA2)
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import Control.Monad.Trans.Except (throwE)
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import Data.Maybe (catMaybes)
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import Data.Text (Text)
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import Language.GraphQL.Type
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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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type ID = Text
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data CharCommon = CharCommon
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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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} deriving (Show)
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data Human = Human
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{ _humanChar :: CharCommon
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, homePlanet :: Text
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}
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data Droid = Droid
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{ _droidChar :: CharCommon
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, primaryFunction :: Text
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}
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type Character = Either Droid Human
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id_ :: Character -> ID
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id_ (Left x) = _id_ . _droidChar $ x
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id_ (Right x) = _id_ . _humanChar $ x
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name_ :: Character -> Text
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name_ (Left x) = _name . _droidChar $ x
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name_ (Right x) = _name . _humanChar $ x
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friends :: Character -> [ID]
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friends (Left x) = _friends . _droidChar $ x
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friends (Right x) = _friends . _humanChar $ x
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appearsIn :: Character -> [Int]
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appearsIn (Left x) = _appearsIn . _droidChar $ x
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appearsIn (Right x) = _appearsIn . _humanChar $ x
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secretBackstory :: Resolve Identity
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secretBackstory = throwE "secretBackstory is secret."
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typeName :: Character -> Text
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typeName = either (const "Droid") (const "Human")
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luke :: Character
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luke = Right luke'
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luke' :: Human
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luke' = Human
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{ _humanChar = CharCommon
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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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}
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, homePlanet = "Tatooine"
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}
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vader :: Human
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vader = Human
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{ _humanChar = CharCommon
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{ _id_ = "1001"
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, _name = "Darth Vader"
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, _friends = ["1004"]
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, _appearsIn = [4,5,6]
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}
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, homePlanet = "Tatooine"
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}
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han :: Human
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han = Human
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{ _humanChar = CharCommon
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{ _id_ = "1002"
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, _name = "Han Solo"
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, _friends = ["1000","1003","2001" ]
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, _appearsIn = [4,5,6]
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}
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, homePlanet = mempty
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}
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leia :: Human
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leia = Human
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{ _humanChar = CharCommon
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{ _id_ = "1003"
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, _name = "Leia Organa"
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, _friends = ["1000","1002","2000","2001"]
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, _appearsIn = [4,5,6]
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}
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, homePlanet = "Alderaan"
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}
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tarkin :: Human
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tarkin = Human
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{ _humanChar = CharCommon
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{ _id_ = "1004"
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, _name = "Wilhuff Tarkin"
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, _friends = ["1001"]
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, _appearsIn = [4]
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}
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, homePlanet = mempty
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}
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threepio :: Droid
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threepio = Droid
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{ _droidChar = CharCommon
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{ _id_ = "2000"
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, _name = "C-3PO"
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, _friends = ["1000","1002","1003","2001" ]
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, _appearsIn = [ 4, 5, 6 ]
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}
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, primaryFunction = "Protocol"
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}
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artoo :: Character
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artoo = Left artoo'
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artoo' :: Droid
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artoo' = Droid
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{ _droidChar = CharCommon
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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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}
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, primaryFunction = "Astrometch"
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}
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-- ** Helper functions
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getHero :: Int -> Character
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getHero 5 = luke
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getHero _ = artoo
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getHuman :: ID -> Maybe Character
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getHuman = fmap Right . getHuman'
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getHuman' :: ID -> Maybe Human
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getHuman' "1000" = pure luke'
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getHuman' "1001" = pure vader
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getHuman' "1002" = pure han
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getHuman' "1003" = pure leia
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getHuman' "1004" = pure tarkin
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getHuman' _ = empty
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getDroid :: ID -> Maybe Character
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getDroid = fmap Left . getDroid'
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getDroid' :: ID -> Maybe Droid
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getDroid' "2000" = pure threepio
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getDroid' "2001" = pure artoo'
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getDroid' _ = empty
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getFriends :: Character -> [Character]
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getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
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getEpisode :: Int -> Maybe Text
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getEpisode 4 = pure "NEW_HOPE"
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getEpisode 5 = pure "EMPIRE"
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getEpisode 6 = pure "JEDI"
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getEpisode _ = empty
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