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

import { RabbitSubscribe } from '@golevelup/nestjs-rabbitmq';
import { Controller } from '@nestjs/common';
import { CommandBus } from '@nestjs/cqrs';
import { CreateAdCommand } from '../../commands/create-ad.command';
import { CreateAdRequest } from '../../domain/dtos/create-ad.request';
import { validateOrReject } from 'class-validator';
import { Messager } from '../secondaries/messager';
import { plainToInstance } from 'class-transformer';
import { DatabaseException } from 'src/modules/database/exceptions/database.exception';
import { ExceptionCode } from 'src/modules/utils/exception-code.enum';

@Controller()
export class AdMessagerController {
  constructor(
    private readonly messager: Messager,
    private readonly commandBus: CommandBus,
  ) {}

  @RabbitSubscribe({
    name: 'adCreated',
  })
  async adCreatedHandler(message: string): Promise<void> {
    let createAdRequest: CreateAdRequest;
    // parse message to request instance
    try {
      createAdRequest = plainToInstance(CreateAdRequest, JSON.parse(message));
      // validate instance
      await validateOrReject(createAdRequest);
      // validate nested objects (fixes direct nested validation bug)
      for (const waypoint of createAdRequest.waypoints) {
        try {
          await validateOrReject(waypoint);
        } catch (e) {
          throw e;
        }
      }
    } catch (e) {
      this.messager.publish(
        'matcher.ad.crit',
        JSON.stringify({
          message: `Can't validate message : ${message}`,
          error: e,
        }),
      );
    }
    try {
      await this.commandBus.execute(new CreateAdCommand(createAdRequest));
    } catch (e) {
      if (e instanceof DatabaseException) {
        if (e.message.includes('already exists')) {
          this.messager.publish(
            'matcher.ad.crit',
            JSON.stringify({
              code: ExceptionCode.ALREADY_EXISTS,
              message: 'Already exists',
              uuid: createAdRequest.uuid,
            }),
          );
        }
        if (e.message.includes("Can't reach database server")) {
          this.messager.publish(
            'matcher.ad.crit',
            JSON.stringify({
              code: ExceptionCode.UNAVAILABLE,
              message: 'Database server unavailable',
              uuid: createAdRequest.uuid,
            }),
          );
        }
      }
      this.messager.publish(
        'logging.matcher.ad.crit',
        JSON.stringify({
          message,
          error: e,
        }),
      );
    }
  }
}