mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-20 22:11:45 +03:00
0b827fae66
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/6541 Co-authored-by: Auke Booij <164426+abooij@users.noreply.github.com> GitOrigin-RevId: 5a2e35da2cf8718ee452429c56986066a3dc0c54
281 lines
11 KiB
Haskell
281 lines
11 KiB
Haskell
-- | Tools for generating fields for Apollo federation
|
|
module Hasura.GraphQL.ApolloFederation
|
|
( -- * Field Parser generators
|
|
mkEntityUnionFieldParser,
|
|
mkServiceField,
|
|
apolloRootFields,
|
|
ApolloFederationParserFunction (..),
|
|
convertToApolloFedParserFunc,
|
|
)
|
|
where
|
|
|
|
import Control.Lens ((??))
|
|
import Data.Aeson qualified as J
|
|
import Data.Aeson.Key qualified as K
|
|
import Data.Aeson.KeyMap qualified as KMap
|
|
import Data.Aeson.Ordered qualified as JO
|
|
import Data.Bifunctor (Bifunctor (bimap))
|
|
import Data.HashMap.Strict qualified as Map
|
|
import Data.HashMap.Strict.InsOrd qualified as OMap
|
|
import Data.HashSet qualified as Set
|
|
import Data.Text qualified as T
|
|
import Hasura.Base.Error
|
|
import Hasura.Base.ErrorMessage (toErrorMessage)
|
|
import Hasura.GraphQL.Parser qualified as P
|
|
import Hasura.GraphQL.Schema.Common
|
|
import Hasura.GraphQL.Schema.NamingCase
|
|
import Hasura.GraphQL.Schema.Options (StringifyNumbers)
|
|
import Hasura.GraphQL.Schema.Parser
|
|
import Hasura.Name qualified as Name
|
|
import Hasura.Prelude
|
|
import Hasura.RQL.IR qualified as IR
|
|
import Hasura.RQL.IR.Root
|
|
import Hasura.RQL.IR.Select
|
|
import Hasura.RQL.IR.Value (UnpreparedValue, ValueWithOrigin (ValueNoOrigin))
|
|
import Hasura.RQL.Types.Backend
|
|
import Hasura.RQL.Types.Column
|
|
import Hasura.RQL.Types.Source
|
|
import Hasura.RQL.Types.Table
|
|
import Hasura.SQL.AnyBackend qualified as AB
|
|
import Hasura.Server.Types
|
|
import Language.GraphQL.Draft.Printer qualified as Printer
|
|
import Language.GraphQL.Draft.Syntax qualified as G
|
|
import Text.Builder qualified as Builder
|
|
|
|
-- | Internal parser function for entities field
|
|
data ApolloFederationParserFunction n = ApolloFederationParserFunction
|
|
{ aafuGetRootField :: ApolloFederationAnyType -> n (QueryRootField UnpreparedValue)
|
|
}
|
|
|
|
-- | Haskell representation of _Any scalar
|
|
data ApolloFederationAnyType = ApolloFederationAnyType
|
|
{ afTypename :: G.Name,
|
|
afPKValues :: J.Object
|
|
}
|
|
deriving stock (Show)
|
|
|
|
-- | Parser for _Any scalar
|
|
anyParser :: P.Parser origin 'Both Parse ApolloFederationAnyType
|
|
anyParser =
|
|
jsonScalar Name.__Any (Just "Scalar _Any") `bind` \val -> do
|
|
let typenameKey = K.fromText "__typename"
|
|
case val of
|
|
J.Object obj -> case KMap.lookup typenameKey obj of
|
|
Just (J.String txt) -> case G.mkName txt of
|
|
Just tName ->
|
|
pure $
|
|
ApolloFederationAnyType
|
|
{ afTypename = tName,
|
|
afPKValues = KMap.delete typenameKey obj
|
|
}
|
|
Nothing -> P.parseError $ toErrorMessage $ txt <> " is not a valid graphql name"
|
|
Nothing -> P.parseError $ toErrorMessage "__typename key not found"
|
|
_ -> P.parseError $ toErrorMessage "__typename can only be a string value"
|
|
_ -> P.parseError $ toErrorMessage "representations is expecting a list of objects only"
|
|
|
|
convertToApolloFedParserFunc ::
|
|
(MonadParse n, Backend b) =>
|
|
SourceInfo b ->
|
|
TableInfo b ->
|
|
TablePermG b (UnpreparedValue b) ->
|
|
StringifyNumbers ->
|
|
Maybe NamingCase ->
|
|
NESeq (ColumnInfo b) ->
|
|
Parser 'Output n (AnnotatedFields b) ->
|
|
Parser 'Output n (ApolloFederationParserFunction n)
|
|
convertToApolloFedParserFunc sInfo tInfo selPerm stringifyNumbers tCase pKeys =
|
|
fmap (modifyApolloFedParserFunc sInfo tInfo selPerm stringifyNumbers tCase pKeys)
|
|
|
|
modifyApolloFedParserFunc ::
|
|
(MonadParse n, Backend b) =>
|
|
SourceInfo b ->
|
|
TableInfo b ->
|
|
TablePermG b (UnpreparedValue b) ->
|
|
StringifyNumbers ->
|
|
Maybe NamingCase ->
|
|
NESeq (ColumnInfo b) ->
|
|
AnnotatedFields b ->
|
|
ApolloFederationParserFunction n
|
|
modifyApolloFedParserFunc
|
|
SourceInfo {..}
|
|
TableInfo {..}
|
|
selectPermissions
|
|
stringifyNumbers
|
|
tCase
|
|
primaryKeys
|
|
annField = ApolloFederationParserFunction $ \ApolloFederationAnyType {..} -> do
|
|
allConstraints <-
|
|
for primaryKeys \columnInfo -> do
|
|
let colName = G.unName $ ciName columnInfo
|
|
cvType = ciType columnInfo
|
|
cvValue <- case KMap.lookup (K.fromText colName) afPKValues of
|
|
Nothing -> P.parseError . toErrorMessage $ "cannot find " <> colName <> " in _Any type"
|
|
Just va -> liftQErr $ parseScalarValueColumnType (ciType columnInfo) va
|
|
pure $
|
|
IR.BoolField . IR.AVColumn columnInfo . pure . IR.AEQ True . IR.mkParameter $
|
|
ValueNoOrigin $
|
|
ColumnValue {..}
|
|
let whereExpr = Just $ IR.BoolAnd $ toList allConstraints
|
|
sourceName = _siName
|
|
sourceConfig = _siConfiguration
|
|
tableName = _tciName _tiCoreInfo
|
|
queryDBRoot =
|
|
IR.QDBR $
|
|
IR.QDBSingleRow $
|
|
IR.AnnSelectG
|
|
{ IR._asnFields = annField,
|
|
IR._asnFrom = IR.FromTable tableName,
|
|
IR._asnPerm = selectPermissions,
|
|
IR._asnArgs = IR.noSelectArgs {IR._saWhere = whereExpr},
|
|
IR._asnStrfyNum = stringifyNumbers,
|
|
IR._asnNamingConvention = tCase
|
|
}
|
|
pure $
|
|
IR.RFDB sourceName $
|
|
AB.mkAnyBackend $
|
|
IR.SourceConfigWith sourceConfig Nothing $
|
|
queryDBRoot
|
|
where
|
|
liftQErr = either (P.parseError . toErrorMessage . qeError) pure . runExcept
|
|
|
|
-------------------------------------------------------------------------------
|
|
-- Related to @service@ field
|
|
|
|
-- main function
|
|
|
|
-- | Creates @_service@ @FieldParser@ using the schema introspection.
|
|
-- This will allow us to process the following query:
|
|
--
|
|
-- > query {
|
|
-- > _service {
|
|
-- > sdl
|
|
-- > }
|
|
-- > }
|
|
mkServiceField ::
|
|
FieldParser P.Parse (G.SchemaIntrospection -> QueryRootField UnpreparedValue)
|
|
mkServiceField = serviceFieldParser
|
|
where
|
|
sdlField = JO.String . generateSDL <$ P.selection_ Name._sdl (Just "SDL representation of schema") P.string
|
|
serviceParser = P.nonNullableParser $ P.selectionSet Name.__Service Nothing [sdlField]
|
|
serviceFieldParser =
|
|
P.subselection_ Name.__service Nothing serviceParser `bindField` \selSet -> do
|
|
let partialValue = OMap.map (\ps -> handleTypename (\tName _ -> JO.toOrdered tName) ps) (OMap.mapKeys G.unName selSet)
|
|
pure \schemaIntrospection -> RFRaw . JO.fromOrderedHashMap $ (partialValue ?? schemaIntrospection)
|
|
|
|
apolloRootFields ::
|
|
Set.HashSet ExperimentalFeature ->
|
|
[(G.Name, Parser 'Output P.Parse (ApolloFederationParserFunction P.Parse))] ->
|
|
[FieldParser P.Parse (G.SchemaIntrospection -> QueryRootField UnpreparedValue)]
|
|
apolloRootFields expFeatures apolloFedTableParsers =
|
|
let -- generate the `_service` field parser
|
|
serviceField = mkServiceField
|
|
|
|
-- generate the `_entities` field parser
|
|
entityField = const <$> mkEntityUnionFieldParser apolloFedTableParsers
|
|
in -- we would want to expose these fields inorder to support apollo federation
|
|
-- refer https://www.apollographql.com/docs/federation/federation-spec
|
|
-- `serviceField` is essential to connect hasura to gateway, `entityField`
|
|
-- is essential only if we have types that has @key directive
|
|
if
|
|
| EFApolloFederation `elem` expFeatures && not (null apolloFedTableParsers) ->
|
|
[serviceField, entityField]
|
|
| EFApolloFederation `elem` expFeatures ->
|
|
[serviceField]
|
|
| otherwise -> []
|
|
|
|
-- helpers
|
|
|
|
-- | Generate sdl from the schema introspection
|
|
generateSDL :: G.SchemaIntrospection -> Text
|
|
generateSDL (G.SchemaIntrospection sIntro) = sdl
|
|
where
|
|
-- NOTE: add this to the sdl to support apollo v2 directive
|
|
_supportV2 :: Text
|
|
_supportV2 = "\n\nextend schema\n@link(url: \"https://specs.apollo.dev/federation/v2.0\",\nimport: [\"@key\", \"@shareable\"])"
|
|
|
|
-- first we filter out the type definitions which are not relevent such as
|
|
-- schema fields and types (starts with `__`)
|
|
typeDefns = map (G.TypeSystemDefinitionType . filterTypeDefinition . bimap (const ()) id) (Map.elems sIntro)
|
|
|
|
-- next we get the root operation type definitions
|
|
rootOpTypeDefns =
|
|
mapMaybe
|
|
( \(fieldName, operationType) ->
|
|
Map.lookup fieldName sIntro
|
|
$> G.RootOperationTypeDefinition operationType fieldName
|
|
)
|
|
[ (Name._query_root, G.OperationTypeQuery),
|
|
(Name._mutation_root, G.OperationTypeMutation),
|
|
(Name._subscription_root, G.OperationTypeSubscription)
|
|
]
|
|
|
|
-- finally we gather everything, run the printer and generate full sdl in `Text`
|
|
sdl = Builder.run $ Printer.schemaDocument getSchemaDocument
|
|
|
|
getSchemaDocument :: G.SchemaDocument
|
|
getSchemaDocument =
|
|
G.SchemaDocument $
|
|
G.TypeSystemDefinitionSchema (G.SchemaDefinition Nothing rootOpTypeDefns) : typeDefns
|
|
|
|
-- | Filter out schema components from sdl which are not required by apollo federation
|
|
filterTypeDefinition :: G.TypeDefinition possibleTypes G.InputValueDefinition -> G.TypeDefinition possibleTypes G.InputValueDefinition
|
|
filterTypeDefinition = \case
|
|
G.TypeDefinitionObject (G.ObjectTypeDefinition a b c d e) ->
|
|
-- We are skipping the schema types here
|
|
G.TypeDefinitionObject $
|
|
G.ObjectTypeDefinition a b c d (filter (not . T.isPrefixOf "__" . G.unName . G._fldName) e)
|
|
typeDef -> typeDef
|
|
|
|
-------------------------------------------------------------------------------
|
|
-- Related to @_entities@ field
|
|
|
|
-- main function
|
|
|
|
-- | Creates @_entities@ @FieldParser@ using `Parser`s for Entity union, schema
|
|
-- introspection and a list of all query `FieldParser`.
|
|
-- This will allow us to process the following query:
|
|
--
|
|
-- > query ($representations: [_Any!]!) {
|
|
-- > _entities(representations: $representations) {
|
|
-- > ... on SomeType {
|
|
-- > foo
|
|
-- > bar
|
|
-- > }
|
|
-- > }
|
|
-- > }
|
|
mkEntityUnionFieldParser ::
|
|
[(G.Name, Parser 'Output Parse (ApolloFederationParserFunction Parse))] ->
|
|
FieldParser P.Parse (QueryRootField UnpreparedValue)
|
|
mkEntityUnionFieldParser apolloFedTableParsers =
|
|
let entityParserMap = Map.fromList apolloFedTableParsers
|
|
|
|
-- the Union `Entities`
|
|
bodyParser = P.selectionSetUnion Name.__Entity (Just "A union of all types that use the @key directive") entityParserMap
|
|
|
|
-- name of the field
|
|
name = Name.__entities
|
|
|
|
-- description of the field
|
|
description = Just "query _Entity union"
|
|
|
|
representationParser =
|
|
field Name._representations Nothing $ list $ anyParser
|
|
|
|
entityParser =
|
|
subselection name description representationParser bodyParser
|
|
`bindField` \(parsedArgs, parsedBody) -> do
|
|
rootFields <-
|
|
for
|
|
parsedArgs
|
|
( \anyArg ->
|
|
case Map.lookup (afTypename anyArg) parsedBody of
|
|
Nothing -> (P.parseError . toErrorMessage) $ G.unName (afTypename anyArg) <> " is not found in selection set or apollo federation is not enabled for the type"
|
|
Just aafus -> (aafuGetRootField aafus) anyArg
|
|
)
|
|
pure $ concatQueryRootFields rootFields
|
|
in entityParser
|
|
|
|
-- | concatenates multiple fields
|
|
concatQueryRootFields :: [QueryRootField UnpreparedValue] -> QueryRootField UnpreparedValue
|
|
concatQueryRootFields = RFMulti
|