@addapptables/microservice/src/services/initialize-adapter-bus.service.ts

addapptables microservice

import { isEmpty, isNil } from 'ramda';
import {
  MicroserviceOptions,
  IBusAdapter,
  OnInit,
  SetOptions,
} from '../interfaces';
import { BusConfigException } from '../exceptions';
import { ModuleRef } from '@nestjs/core';

export class InitializeAdapterBus {
  constructor(
    private readonly microserviceOptions: MicroserviceOptions,
    private readonly module: ModuleRef
  ) {}

  // TODO: apply design pattern
  async init(config?: any): Promise<IBusAdapter> {
    const adapterConfig = this.microserviceOptions.adapter;

    if (isEmpty(adapterConfig) || isNil(adapterConfig)) {
      throw new BusConfigException('The Bus Adapter was not configured.');
    }

    const AdapterPrototype = adapterConfig.adapterPrototype;

    // TODO: validate prototype is IAdapterBus
    if (isEmpty(AdapterPrototype) || isNil(AdapterPrototype)) {
      throw new BusConfigException(
        'The Bus Adapter Prototype was not configured.'
      );
    }
    const adapterInstance: IBusAdapter = await this.module.resolve(
      AdapterPrototype,
      undefined,
      { strict: false }
    );

    if (typeof adapterInstance[SetOptions] === 'function') {
      await adapterInstance[SetOptions](config);
    }

    if (typeof adapterInstance[OnInit] === 'function') {
      await adapterInstance[OnInit]();
    }
    return adapterInstance;
  }
}