fix: allow to treat a subgraph as regular graphql api

go.mod

@@ -44,7 +44,7 @@ require (
 	github.com/tidwall/gjson v1.11.0
 	github.com/tidwall/sjson v1.1.5
 	github.com/valyala/fasthttp v1.26.0
-	github.com/wundergraph/graphql-go-tools v1.60.3
+	github.com/wundergraph/graphql-go-tools v1.60.4
 	go.uber.org/zap v1.18.1
 	golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2
 	golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8

go.sum

@@ -527,8 +527,8 @@ github.com/vmihailenco/msgpack/v5 v5.1.0 h1:+od5YbEXxW95SPlW6beocmt8nOtlh83zqat5
 github.com/vmihailenco/msgpack/v5 v5.1.0/go.mod h1:C5gboKD0TJPqWDTVTtrQNfRbiBwHZGo8UTqP/9/XvLI=
 github.com/vmihailenco/tagparser v0.1.2 h1:gnjoVuB/kljJ5wICEEOpx98oXMWPLj22G67Vbd1qPqc=
 github.com/vmihailenco/tagparser v0.1.2/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
-github.com/wundergraph/graphql-go-tools v1.60.3 h1:HNKjKJ80MhEHx6ODeTogU/sS2ukMzkZPA2b4gF9PlVg=
-github.com/wundergraph/graphql-go-tools v1.60.3/go.mod h1:kHPC4B6vQFMohnEofRgcy37eYhoDsjzxJ4P8ZhQrV4M=
+github.com/wundergraph/graphql-go-tools v1.60.4 h1:7whFhINu4x6oFNMvDj5tx1HHAbtIS2U0t4w6blXgWYo=
+github.com/wundergraph/graphql-go-tools v1.60.4/go.mod h1:kHPC4B6vQFMohnEofRgcy37eYhoDsjzxJ4P8ZhQrV4M=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f h1:J9EGpcZtP0E/raorCMxlFGSTBrsSlaDGf3jU/qvAE2c=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHovont7NscjpAxXsDA8S8BMYve8Y5+7cuRE7R0=

packages/sdk/src/definition/federation-introspection.ts

@@ -11,18 +11,6 @@ import { HeadersBuilder, mapHeaders } from './headers-builder';
 import { Fetcher } from './introspection-fetcher';
 import { Logger } from '../logger';
 
-export const isFederationService = (schema: GraphQLSchema): boolean => {
-	const queryType = schema.getQueryType();
-	if (queryType === undefined || queryType === null) {
-		return false;
-	}
-	const fields = queryType.getFields();
-	if (fields === undefined) {
-		return false;
-	}
-	return Object.keys(fields).indexOf('_service') !== -1;
-};
-
 export const fetchFederationServiceSDL = async (
 	url: string,
 	headers?: Record<string, string>,

packages/sdk/src/definition/graphql-introspection.ts

@@ -1,4 +1,4 @@
-import { fetchFederationServiceSDL, isFederationService } from './federation-introspection';
+import { fetchFederationServiceSDL } from './federation-introspection';
 import { configuration } from '../graphql/configuration';
 import {
 	buildClientSchema,
@@ -69,7 +69,9 @@ export const resolveGraphqlIntrospectionHeaders = (headers?: { [key: string]: HT
 	return baseHeaders;
 };
 
-export const introspectGraphql = async (introspection: GraphQLIntrospection): Promise<GraphQLApi> => {
+export const introspectGraphql = async (
+	introspection: Omit<GraphQLIntrospection, 'isFederation'>
+): Promise<GraphQLApi> => {
 	return introspectWithCache(introspection, async (introspection: GraphQLIntrospection): Promise<GraphQLApi> => {
 		const headersBuilder = new HeadersBuilder();
 		const introspectionHeadersBuilder = new HeadersBuilder();
@@ -87,7 +89,7 @@ export const introspectGraphql = async (introspection: GraphQLIntrospection): Pr
 
 		let schema = await introspectGraphQLSchema(introspection, introspectionHeaders);
 		schema = lexicographicSortSchema(schema);
-		const federationEnabled = isFederationService(schema);
+		const federationEnabled = introspection.isFederation || false;
 		const upstreamSchema = cleanupSchema(schema, introspection);
 		const { schemaSDL, customScalarTypeFields } = transformSchema.replaceCustomScalars(upstreamSchema, introspection);
 		let serviceSDL: string | undefined;