nestjs / Elasticsearch

A progressive Node.js framework for building efficient and scalable server-side applications.

Description

Elasticsearch module for Nest based on the official @elastic/elasticsearch package.

Installation

$ npm i --save @nestjs/elasticsearch @elastic/elasticsearch

Usage

Import ElasticsearchModule:

@Module({
  imports: [ElasticsearchModule.register({
    node: 'http://localhost:9200',
  })],
  providers: [...],
})
export class SearchModule {}

Inject ElasticsearchService:

@Injectable()
export class SearchService {
  constructor(private readonly elasticsearchService: ElasticsearchService) {}
}

Async options

Quite often you might want to asynchronously pass your module options instead of passing them beforehand. In such case, use registerAsync() method, that provides a couple of various ways to deal with async data.

1. Use factory

ElasticsearchModule.registerAsync({
  useFactory: () => ({
    node: 'http://localhost:9200'
  })
});

Obviously, our factory behaves like every other one (might be async and is able to inject dependencies through inject).

ElasticsearchModule.registerAsync({
  imports: [ConfigModule],
  useFactory: async (configService: ConfigService) => ({
    node: configService.get('ELASTICSEARCH_NODE'),
  }),
  inject: [ConfigService],
}),

2. Use class

ElasticsearchModule.registerAsync({
  useClass: ElasticsearchConfigService
});

Above construction will instantiate ElasticsearchConfigService inside ElasticsearchModule and will leverage it to create options object.

class ElasticsearchConfigService implements ElasticsearchOptionsFactory {
  createElasticsearchOptions(): ElasticsearchModuleOptions {
    return {
      node: 'http://localhost:9200'
    };
  }
}

3. Use existing

ElasticsearchModule.registerAsync({
  imports: [ConfigModule],
  useExisting: ConfigService,
}),

It works the same as useClass with one critical difference - ElasticsearchModule will lookup imported modules to reuse already created ConfigService, instead of instantiating it on its own.

API Spec

The ElasticsearchService wraps the Client from the official @elastic/elasticsearch methods. The ElasticsearchModule.register() takes options object as an argument, read more.

Support

Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please read more here.

Stay in touch

• Author - Kamil Myśliwiec
• Website - https://nestjs.com
• Twitter - @nestframework

License

Nest is MIT licensed.