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Begin working on GraphQL
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graphql/LICENSE
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Apache License
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http://www.apache.org/licenses/
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2
graphql/Setup.hs
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2
graphql/Setup.hs
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import Distribution.Simple
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main = defaultMain
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1
graphql/hie.yaml
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1
graphql/hie.yaml
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cradle: { stack: { component: "mu-graphql:lib" } }
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28
graphql/mu-graphql.cabal
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28
graphql/mu-graphql.cabal
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cabal-version: >=1.10
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-- Initial package description 'mu-haskell.cabal' generated by 'cabal
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-- init'. For further documentation, see
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-- http://haskell.org/cabal/users-guide/
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name: mu-graphql
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version: 0.1.0.0
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synopsis: Playing with GraphQL and Mu
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-- description:
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-- bug-reports:
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license: Apache-2.0
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license-file: LICENSE
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author: Alejandro Serrano, Flavio Corpa
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maintainer: alejandro.serrano@47deg.com
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-- copyright:
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category: Network
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build-type: Simple
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extra-source-files: CHANGELOG.md
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library
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exposed-modules: Mu.GraphQL
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-- other-modules:
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-- other-extensions:
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build-depends: base >=4.12 && <5, mtl, sop-core,
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mu-schema, conduit, text, template-haskell
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hs-source-dirs: src
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default-language: Haskell2010
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ghc-options: -Wall -fprint-potential-instances
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123
graphql/src/Mu/GraphQL.hs
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123
graphql/src/Mu/GraphQL.hs
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{-# language DataKinds #-}
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{-# language DeriveFunctor #-}
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{-# language FlexibleContexts #-}
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{-# language FlexibleInstances #-}
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{-# language GADTs #-}
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{-# language MultiParamTypeClasses #-}
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{-# language PolyKinds #-}
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{-# language ScopedTypeVariables #-}
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{-# language TypeApplications #-}
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{-# language TypeFamilies #-}
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{-# language TypeOperators #-}
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{-# language UndecidableInstances #-}
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module Mu.GraphQL where
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import Data.Kind
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import Data.SOP.NP
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import Mu.Schema
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-- | Defines whether we should get each field.
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-- Invariant: if we have a recursive appearance
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-- of the type, 'WantedSubset' must be used.
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-- We could fix if with a fixed-point view
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-- (using 'Fix'), but it's going too far.
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data Wanted a
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= NotWanted
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| WantedValue
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| WantedSubset a
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deriving (Show, Eq, Ord, Functor)
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-- | This is the resolver which takes the entire
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-- query and returns the entire set of results.
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type FullResolver m f
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= f Wanted -> m (f Maybe)
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-- COMPOSABLE RESOLVERS
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-- ====================
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-- We can implement resolvers "piece by piece",
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-- and then have a final step which puts
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-- everything together.
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type SchemaResolver m (sch :: Schema tn fn)
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= NP (TypeResolver m sch) sch
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data TypeResolver m (sch :: Schema tn fn) (ty :: TypeDef tn fn) where
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RR :: NP (FieldResolver m sch name) fields
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-> TypeResolver m sch ('DRecord name fields)
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OR :: m (Term Maybe sch t)
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-> TypeResolver m sch t
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data FieldResolver m (sch :: Schema tn fn) (ty :: tn) (fld :: FieldDef tn fn) where
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FR :: (Term Maybe sch (sch :/: ty) -> m (ConstructFieldType sch fld))
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-> FieldResolver m sch ty ('FieldDef name fld)
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type family ConstructFieldType (sch :: Schema tn fn) (fld :: FieldType tn) :: Type where
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ConstructFieldType sch 'TNull
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= ()
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ConstructFieldType sch ('TPrimitive p)
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= p
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ConstructFieldType sch ('TSchematic other)
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= Term Maybe sch (sch :/: other)
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ConstructFieldType sch ('TOption fld)
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= Maybe (ConstructFieldType sch fld)
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ConstructFieldType sch ('TList fld)
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= [ConstructFieldType sch fld]
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-- | The composer
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newtype W f a b w = W { unW :: f w a b }
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composeFullResolver
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:: SchemaResolver m sch
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-> FullResolver m (W Term sch ty)
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composeFullResolver = undefined
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-- COMPOSABLE RESOLVERS OVER DOMAIN TYPES
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-- ======================================
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type SchemaResolverD m (sch :: Schema tn fn)
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= NP (TypeResolverD m sch) sch
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data TypeResolverD m (sch :: Schema tn fn) (ty :: TypeDef tn fn) where
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RR_ :: NP (FieldResolverD m sch name) fields
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-> TypeResolverD m sch ('DRecord name fields)
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OR_ :: ToSchema Maybe sch name r
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=> m r -> TypeResolverD m sch ('DEnum name choice)
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data FieldResolverD m (sch :: Schema tn fn) (ty :: tn) (fld :: FieldDef tn fn) where
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FR_ :: ( FromSchema Maybe sch ty input
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, ToSchemaD output (ConstructFieldType sch fld) )
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=> (input -> m output)
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-> FieldResolverD m sch ty ('FieldDef name fld)
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class ToSchemaD r term where
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toSchemaD :: r -> term
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instance {-# OVERLAPPABLE #-} ToSchemaD p p where
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toSchemaD = id
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instance {-# OVERLAPS #-}
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(ToSchema Maybe sch ty r, sch :/: ty ~ t)
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=> ToSchemaD r (Term Maybe sch t) where
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toSchemaD = toSchema @_ @_ @Maybe @sch @ty
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instance {-# OVERLAPS #-}
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(ToSchemaD r term)
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=> ToSchemaD (Maybe r) (Maybe term) where
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toSchemaD = fmap toSchemaD
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instance {-# OVERLAPS #-}
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(ToSchemaD r term)
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=> ToSchemaD [r] [term] where
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toSchemaD = fmap toSchemaD
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resolverDomain
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:: SchemaResolverD m sch
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-> SchemaResolver m sch
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resolverDomain = undefined
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resolve
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:: forall tn fn (sch :: Schema tn fn) (ty :: tn)
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(m :: Type -> Type) (r :: Type) (s :: Type).
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(Functor m, ToSchema Wanted sch ty r, FromSchema Maybe sch ty s)
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=> SchemaResolverD m sch -> r -> m s
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resolve r x
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= fromSchema @tn @fn @Maybe @sch @ty . unW <$>
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(composeFullResolver $ resolverDomain r)
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(W $ toSchema @tn @fn @Wanted @sch @ty x)
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@ -15,6 +15,7 @@ packages:
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- examples/todolist
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- examples/with-persistent
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- compendium-client
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- graphql
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|
||||
extra-deps:
|
||||
- http2-client-0.9.0.0
|
||||
|
@ -15,6 +15,7 @@ packages:
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||||
- examples/todolist
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||||
- examples/with-persistent
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||||
- compendium-client
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||||
- graphql
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||||
|
||||
extra-deps:
|
||||
- http2-client-0.9.0.0
|
||||
|
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