maestro/src/clients/auth/client.service.ts

import { OnModuleInit, Inject } from '@nestjs/common';
import { ClientGrpc } from '@nestjs/microservices';

import { CognitoServiceInterface } from '@victorradael/protospack';

import { ILogin } from './interfaces';

export class AuthClientService implements OnModuleInit {
  private cognitoService: CognitoServiceInterface;
  constructor(
    @Inject('AUTH_PACKAGE') private readonly grpcClient: ClientGrpc,
  ) {}

  onModuleInit() {
    this.cognitoService = this.grpcClient.getService<CognitoServiceInterface>(
      'CognitoProtoService',
    );
  }

  async signIn({ username, password }: ILogin): Promise<any> {
    console.log('CognitoClientService', 'SignIn');

    const tokens = await new Promise((resolve, reject) => {
      this.cognitoService.signIn({ username, password }).subscribe({
        next(x) {
          resolve(x);
        },
        error(err) {
          console.log('Observable Error');
          reject(err);
        },
        complete() {
          console.log('done');
        },
      });
    })
      .then((res) => res)
      .catch((err) => {
        throw new Error(err);
      });
    return tokens;
  }
}