create backend modules for search engines

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

plugins/search-backend-node/src/engines/LunrSearchEngine.ts

@@ -26,6 +26,12 @@ import lunr from 'lunr';
 import { v4 as uuid } from 'uuid';
 import { Logger } from 'winston';
 import { LunrSearchEngineIndexer } from './LunrSearchEngineIndexer';
+import {
+  coreServices,
+  createBackendModule,
+} from '@backstage/backend-plugin-api';
+import { searchEngineRegistryExtensionPoint } from '../extensions';
+import { loggerToWinstonLogger } from '@backstage/backend-common';
 
 /**
  * Type of translated query for the Lunr Search Engine.
@@ -334,3 +340,21 @@ export function parseHighlightFields({
     }),
   );
 }
+
+export const lunrSearchEngineModule = createBackendModule({
+  moduleId: 'lunrSearchEngineModule',
+  pluginId: 'search-backend',
+  register(env) {
+    env.registerInit({
+      deps: {
+        searchEngineRegistry: searchEngineRegistryExtensionPoint,
+        logger: coreServices.logger,
+      },
+      async init({ searchEngineRegistry, logger }) {
+        searchEngineRegistry.setSearchEngine(
+          new LunrSearchEngine({ logger: loggerToWinstonLogger(logger) }),
+        );
+      },
+    });
+  },
+});

plugins/search-backend-node/src/engines/index.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-export { LunrSearchEngine } from './LunrSearchEngine';
+export { LunrSearchEngine, lunrSearchEngineModule } from './LunrSearchEngine';
 export type {
   ConcreteLunrQuery,
   LunrQueryTranslator,

plugins/search-backend-node/src/index.ts

@@ -23,7 +23,7 @@
 export { IndexBuilder } from './IndexBuilder';
 export { Scheduler } from './Scheduler';
 export * from './collators';
-export { LunrSearchEngine } from './engines';
+export { LunrSearchEngine, lunrSearchEngineModule } from './engines';
 export type {
   ConcreteLunrQuery,
   LunrQueryTranslator,