matcher/src/modules/ad/adapters/primaries/ad-messager.controller.ts

import { RabbitSubscribe } from '@golevelup/nestjs-rabbitmq';
import { Controller } from '@nestjs/common';
import { Ad } from '../../domain/entities/ad';
import { InjectMapper } from '@automapper/nestjs';
import { Mapper } from '@automapper/core';
import { CommandBus } from '@nestjs/cqrs';
import { CreateAdCommand } from '../../commands/create-ad.command';
import { CreateAdRequest } from '../../domain/dtos/create-ad.request';
import { ValidationError, validateOrReject } from 'class-validator';

@Controller()
export class AdMessagerController {
  constructor(
    private readonly commandBus: CommandBus,
    @InjectMapper() private readonly mapper: Mapper,
  ) {}

  @RabbitSubscribe({
    name: 'adCreated',
  })
  async adCreatedHandler(message: string): Promise<void> {
    try {
      // parse message to conform to CreateAdRequest (not a real instance yet)
      const parsedMessage: CreateAdRequest = JSON.parse(message);
      console.log(parsedMessage);
      // create a real instance of CreateAdRequest from parsed message
      const createAdRequest: CreateAdRequest = this.mapper.map(
        parsedMessage,
        CreateAdRequest,
        CreateAdRequest,
      );
      console.log(createAdRequest);
      // validate instance
      await validateOrReject(createAdRequest);
      const ad: Ad = await this.commandBus.execute(
        new CreateAdCommand(createAdRequest),
      );
      console.log(ad);
    } catch (e) {
      if (Array.isArray(e)) {
        e.forEach((error) =>
          error instanceof ValidationError
            ? console.log(error.constraints)
            : console.log(error),
        );
      }
    }
  }
}