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116 lines
3.5 KiB
Haskell
116 lines
3.5 KiB
Haskell
module Hasura.GraphQL.Transport.HTTP.Protocol
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( GQLReq(..)
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, GQLBatchedReqs(..)
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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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, GQExecError(..)
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, GQResponse
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, isExecError
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) where
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import Hasura.EncJSON
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import Hasura.Prelude
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import Hasura.RQL.Types
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import Data.Either (isLeft)
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import Language.Haskell.TH.Syntax (Lift)
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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 G.Name] }
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deriving (Ord, Show, Eq, Hashable, Lift)
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instance J.FromJSON GQLExecDoc where
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parseJSON v = GQLExecDoc . G.getExecutableDefinitions <$> J.parseJSON v
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instance J.ToJSON GQLExecDoc where
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toJSON = J.toJSON . G.ExecutableDocument . unGQLExecDoc
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newtype OperationName
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= OperationName { _unOperationName :: G.Name }
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deriving (Ord, Show, Eq, Hashable, J.ToJSON, Lift)
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instance J.FromJSON OperationName where
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parseJSON v = OperationName <$> J.parseJSON v
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type VariableValues = Map.HashMap G.Name 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, Functor, Lift)
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$(J.deriveJSON (J.aesonDrop 3 J.camelCase){J.omitNothingFields=True} ''GQLReq)
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instance (Hashable a) => Hashable (GQLReq a)
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-- | Batched queries are sent as a JSON array of
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-- 'GQLReq' records. This newtype exists to support
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-- the unusual JSON encoding.
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--
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-- See <https://github.com/hasura/graphql-engine/issues/1812>.
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data GQLBatchedReqs a
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= GQLSingleRequest (GQLReq a)
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| GQLBatchedReqs [GQLReq a]
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deriving (Show, Eq, Generic)
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instance J.ToJSON a => J.ToJSON (GQLBatchedReqs a) where
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toJSON (GQLSingleRequest q) = J.toJSON q
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toJSON (GQLBatchedReqs qs) = J.toJSON qs
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instance J.FromJSON a => J.FromJSON (GQLBatchedReqs a) where
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parseJSON arr@J.Array{} = GQLBatchedReqs <$> J.parseJSON arr
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parseJSON other = GQLSingleRequest <$> J.parseJSON other
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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, IsString)
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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" $ throw400 ValidationFailed "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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type GQResult a = Either GQExecError a
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newtype GQExecError = GQExecError [J.Value]
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deriving (Show, Eq, J.ToJSON)
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type GQResponse = GQResult BL.ByteString
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isExecError :: GQResult a -> Bool
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isExecError = isLeft
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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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Right r -> [("data", encJFromLBS r)]
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Left e -> [("data", "null"), ("errors", encJFromJValue e)]
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