Added support for new backend system

Signed-off-by: Rogerio Angeliski <angeliski@hotmail.com>

plugins/adr-backend/README.md

@@ -58,6 +58,24 @@ async function main() {
 
 4. Now run `yarn start-backend` from the repo root
 
+### New Backend System
+
+The ADR backend plugin has support for the [new backend system](https://backstage.io/docs/backend-system/), here's how you can set that up:
+
+In your `packages/backend/src/index.ts` make the following changes:
+
+```diff
+
++ import { adrPlugin } from '@backstage/plugin-adr-backend';
+  const backend = createBackend();
+
++ backend.add(adrPlugin());
+
+// ... other feature additions
+
+  backend.start();
+```
+
 ## Indexing ADR documents for search
 
 Before you are able to start indexing ADR documents to search, you need to go through the [search getting started guide](https://backstage.io/docs/features/search/getting-started).

plugins/adr-backend/api-report.md

@@ -7,6 +7,7 @@
 
 import { AdrDocument } from '@backstage/plugin-adr-common';
 import { AdrFilePathFilterFn } from '@backstage/plugin-adr-common';
+import { BackendFeature } from '@backstage/backend-plugin-api';
 import { CacheClient } from '@backstage/backend-common';
 import { CatalogApi } from '@backstage/catalog-client';
 import { Config } from '@backstage/config';
@@ -43,6 +44,9 @@ export type AdrParserContext = {
   path: string;
 };
 
+// @public
+export const adrPlugin: () => BackendFeature;
+
 // @public (undocumented)
 export type AdrRouterOptions = {
   reader: UrlReader;

plugins/adr-backend/package.json

@@ -29,6 +29,7 @@
   },
   "dependencies": {
     "@backstage/backend-common": "workspace:^",
+    "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/catalog-client": "workspace:^",
     "@backstage/catalog-model": "workspace:^",
     "@backstage/config": "workspace:^",

plugins/adr-backend/src/index.ts

@@ -22,3 +22,4 @@
 
 export * from './search';
 export * from './service';
+export { adrPlugin } from './plugin';

plugins/adr-backend/src/plugin.ts

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * 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 { loggerToWinstonLogger } from '@backstage/backend-common';
+import {
+  coreServices,
+  createBackendPlugin,
+} from '@backstage/backend-plugin-api';
+import { createRouter } from './service/router';
+
+/**
+ * ADR backend plugin
+ *
+ * @public
+ */
+export const adrPlugin = createBackendPlugin({
+  pluginId: 'adr',
+  register(env) {
+    env.registerInit({
+      deps: {
+        logger: coreServices.logger,
+        reader: coreServices.urlReader,
+        cache: coreServices.cache,
+        httpRouter: coreServices.httpRouter,
+      },
+      async init({ httpRouter, logger, reader, cache }) {
+        httpRouter.use(
+          await createRouter({
+            logger: loggerToWinstonLogger(logger),
+            reader,
+            cacheClient: cache,
+          }),
+        );
+      },
+    });
+  },
+});