Move the plugin init into their own files to keep index clean

packages/backend/package.json

@@ -32,7 +32,8 @@
     "@types/helmet": "^0.0.45",
     "jest": "^25.1.0",
     "tsc-watch": "^4.2.3",
-    "typescript": "^3.8.3"
+    "typescript": "^3.8.3",
+    "winston": "^3.2.1"
   },
   "nodemonConfig": {
     "watch": "./dist"

packages/backend/src/index.ts

@@ -28,39 +28,21 @@ import {
   notFoundHandler,
   requestLoggingHandler,
 } from '@backstage/backend-common';
-import {
-  AggregatorInventory,
-  createRouter as inventoryRouter,
-  StaticInventory,
-} from '@backstage/plugin-inventory-backend';
-import {
-  createRouter as scaffolderRouter,
-  DiskStorage,
-  CookieCutter,
-} from '@backstage/plugin-scaffolder-backend';
+import inventory from './plugins/inventory';
+import scaffolder from './plugins/scaffolder';
 import compression from 'compression';
 import cors from 'cors';
 import express from 'express';
 import helmet from 'helmet';
+import { PluginEnvironment } from './types';
 
 const DEFAULT_PORT = 7000;
 const PORT = parseInt(process.env.PORT ?? '', 10) || DEFAULT_PORT;
-const logger = getRootLogger().child({ type: 'plugin' });
+const pluginEnvironment: PluginEnvironment = {
+  logger: getRootLogger().child({ type: 'plugin' }),
+};
 
 async function main() {
-  const inventory = new AggregatorInventory();
-  inventory.enlist(
-    new StaticInventory([
-      { id: 'component1' },
-      { id: 'component2' },
-      { id: 'component3' },
-      { id: 'component4' },
-    ]),
-  );
-
-  const storage = new DiskStorage({ logger });
-  const templater = new CookieCutter();
-
   const app = express();
 
   app.use(helmet());
@@ -68,8 +50,8 @@ async function main() {
   app.use(compression());
   app.use(express.json());
   app.use(requestLoggingHandler());
-  app.use('/inventory', await inventoryRouter({ inventory, logger }));
-  app.use('/scaffolder', await scaffolderRouter({ storage, templater, logger }));
+  app.use('/inventory', await inventory(pluginEnvironment));
+  app.use('/scaffolder', await scaffolder(pluginEnvironment));
   app.use(notFoundHandler());
   app.use(errorHandler());
 

packages/backend/src/plugins/inventory.ts

@@ -0,0 +1,36 @@
+/*
+ * 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 {
+  AggregatorInventory,
+  createRouter,
+  StaticInventory,
+} from '@backstage/plugin-inventory-backend';
+import type { PluginEnvironment } from '../types';
+
+export default async function ({ logger }: PluginEnvironment) {
+  const inventory = new AggregatorInventory();
+  inventory.enlist(
+    new StaticInventory([
+      { id: 'component1' },
+      { id: 'component2' },
+      { id: 'component3' },
+      { id: 'component4' },
+    ]),
+  );
+
+  return await createRouter({ inventory, logger });
+}

packages/backend/src/plugins/scaffolder.ts

@@ -0,0 +1,29 @@
+/*
+ * 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 {
+  CookieCutter,
+  createRouter,
+  DiskStorage,
+} from '@backstage/plugin-scaffolder-backend';
+import type { PluginEnvironment } from '../types';
+
+export default async function ({ logger }: PluginEnvironment) {
+  const storage = new DiskStorage({ logger });
+  const templater = new CookieCutter();
+
+  return await createRouter({ storage, templater, logger });
+}

packages/backend/src/types.ts

@@ -0,0 +1,21 @@
+/*
+ * 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 type { Logger } from 'winston';
+
+export type PluginEnvironment = {
+  logger: Logger;
+};