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131 lines
3.8 KiB
Haskell
131 lines
3.8 KiB
Haskell
module Hasura.GraphQL.Transport.HTTP.Protocol
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( GQLReq(..)
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, GQLReqUnparsed
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, GQLReqParsed
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, toParsed
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, GQLQueryText
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, GQLExecDoc(..)
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, OperationName(..)
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, VariableValues
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, encodeGQErr
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, encodeGQResp
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, GQResult(..)
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, GQResponse
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, isExecError
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, RemoteGqlResp(..)
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, GraphqlResponse(..)
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, encodeGraphqlResponse
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) where
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import Hasura.EncJSON
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import Hasura.GraphQL.Utils
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import Hasura.Prelude
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import Hasura.RQL.Types
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import Language.GraphQL.Draft.Instances ()
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import qualified Data.Aeson as J
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import qualified Data.Aeson.Casing as J
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import qualified Data.Aeson.TH as J
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import qualified Data.ByteString.Lazy as BL
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import qualified Data.HashMap.Strict as Map
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import qualified Language.GraphQL.Draft.Parser as G
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import qualified Language.GraphQL.Draft.Syntax as G
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newtype GQLExecDoc
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= GQLExecDoc { unGQLExecDoc :: [G.ExecutableDefinition] }
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deriving (Ord, Show, Eq, Hashable)
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instance J.FromJSON GQLExecDoc where
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parseJSON v = (GQLExecDoc . G.getExecutableDefinitions) <$> J.parseJSON v
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instance J.ToJSON GQLExecDoc where
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toJSON = J.toJSON . G.ExecutableDocument . unGQLExecDoc
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newtype OperationName
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= OperationName { _unOperationName :: G.Name }
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deriving (Ord, Show, Eq, Hashable, J.ToJSON)
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instance J.FromJSON OperationName where
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parseJSON v = OperationName . G.Name <$> J.parseJSON v
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type VariableValues = Map.HashMap G.Variable J.Value
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data GQLReq a
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= GQLReq
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{ _grOperationName :: !(Maybe OperationName)
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, _grQuery :: !a
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, _grVariables :: !(Maybe VariableValues)
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} deriving (Show, Eq, Generic)
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$(J.deriveJSON (J.aesonDrop 3 J.camelCase){J.omitNothingFields=True}
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''GQLReq
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)
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instance (Hashable a) => Hashable (GQLReq a)
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newtype GQLQueryText
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= GQLQueryText
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{ _unGQLQueryText :: Text
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} deriving (Show, Eq, Ord, J.FromJSON, J.ToJSON, Hashable)
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type GQLReqUnparsed = GQLReq GQLQueryText
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type GQLReqParsed = GQLReq GQLExecDoc
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toParsed :: (MonadError QErr m ) => GQLReqUnparsed -> m GQLReqParsed
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toParsed req = case G.parseExecutableDoc gqlText of
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Left _ -> withPathK "query" $ throwVE "not a valid graphql query"
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Right a -> return $ req { _grQuery = GQLExecDoc $ G.getExecutableDefinitions a }
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where
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gqlText = _unGQLQueryText $ _grQuery req
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encodeGQErr :: Bool -> QErr -> J.Value
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encodeGQErr includeInternal qErr =
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J.object [ "errors" J..= [encodeGQLErr includeInternal qErr]]
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data GQResult a
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= GQSuccess !a
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| GQPreExecError ![J.Value]
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| GQExecError ![J.Value]
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deriving (Show, Eq, Functor, Foldable, Traversable)
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type GQResponse = GQResult BL.ByteString
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isExecError :: GQResult a -> Bool
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isExecError = \case
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GQExecError _ -> True
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_ -> False
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encodeGQResp :: GQResponse -> EncJSON
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encodeGQResp gqResp =
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encJFromAssocList $ case gqResp of
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GQSuccess r -> [("data", encJFromLBS r)]
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GQPreExecError e -> [("errors", encJFromJValue e)]
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GQExecError e -> [("data", "null"), ("errors", encJFromJValue e)]
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-- | Represents GraphQL response from a remote server
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data RemoteGqlResp
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= RemoteGqlResp
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{ _rgqrData :: !(Maybe J.Value)
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, _rgqrErrors :: !(Maybe [J.Value])
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, _rgqrExtensions :: !(Maybe J.Value)
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} deriving (Show, Eq)
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$(J.deriveFromJSON (J.aesonDrop 5 J.camelCase) ''RemoteGqlResp)
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encodeRemoteGqlResp :: RemoteGqlResp -> EncJSON
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encodeRemoteGqlResp (RemoteGqlResp d e ex) =
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encJFromAssocList [ ("data", encJFromJValue d)
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, ("errors", encJFromJValue e)
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, ("extensions", encJFromJValue ex)
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]
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-- | Represents a proper GraphQL response
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data GraphqlResponse
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= GRHasura !GQResponse
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| GRRemote !RemoteGqlResp
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encodeGraphqlResponse :: GraphqlResponse -> EncJSON
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encodeGraphqlResponse = \case
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GRHasura resp -> encodeGQResp resp
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GRRemote resp -> encodeRemoteGqlResp resp
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