feat(graphq): started a simple graphql server

plugins/graphql/src/schema.gql

@@ -0,0 +1,11 @@
+type CatalogEntity {
+  id: String
+}
+
+type CatalogQuery {
+  list: [CatalogEntity!]!
+}
+
+type Query {
+  catalog: CatalogQuery
+}

plugins/graphql/src/service/router.test.ts

@@ -1,45 +0,0 @@
-/*
- * Copyright 2020 Spotify AB
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import { getVoidLogger } from '@backstage/backend-common';
-import express from 'express';
-import request from 'supertest';
-
-import { createRouter } from './router';
-
-describe('createRouter', () => {
-  let app: express.Express;
-
-  beforeAll(async () => {
-    const router = await createRouter({
-      logger: getVoidLogger(),
-    });
-    app = express().use(router);
-  });
-
-  beforeEach(() => {
-    jest.resetAllMocks();
-  });
-
-  describe('GET /health', () => {
-    it('returns ok', async () => {
-      const response = await request(app).get('/health');
-
-      expect(response.status).toEqual(200);
-      expect(response.body).toEqual({ status: 'ok' });
-    });
-  });
-});

plugins/graphql/src/service/router.ts

@@ -18,6 +18,9 @@ import { errorHandler } from '@backstage/backend-common';
 import express from 'express';
 import Router from 'express-promise-router';
 import { Logger } from 'winston';
+import fs from 'fs';
+import path from 'path';
+import { ApolloServer } from 'apollo-server-express';
 
 export interface RouterOptions {
   logger: Logger;
@@ -26,15 +29,22 @@ export interface RouterOptions {
 export async function createRouter(
   options: RouterOptions,
 ): Promise<express.Router> {
-  const { logger } = options;
+  const typeDefs = await fs.promises.readFile(
+    path.resolve(__dirname, '..', 'schema.gql'),
+    'utf-8',
+  );
 
+  const server = new ApolloServer({ typeDefs, logger: options.logger });
   const router = Router();
-  router.use(express.json());
+
+  const apolloMiddlware = server.getMiddleware({ path: '/' });
+  router.use(apolloMiddlware);
 
   router.get('/health', (_, response) => {
-    logger.info('PONG!');
     response.send({ status: 'ok' });
   });
+
   router.use(errorHandler());
+
   return router;
 }