Example of di for notifications

notification.api.js

module.exports = ({repo}, app) => {
  // this our endpoint where is going to validate our email, and the create and finally send it
  app.post('/notifiaction/sendEmail', (req, res, next) => {
    const {validate} = req.container.cradle

    validate(req.body.payload, 'notification')
      .then(payload => {
        return repo.sendEmail(payload)
      })
      .then(ok => {
        res.status(status.OK).json({msg: 'ok'})
      })
      .catch(next)
  })
}

notification.reposoitory.js

const sendEmail = (payload) => {
    return new Promise((resolve, reject) => {
      const {smtpSettings, smtpTransport, nodemailer} = container.cradle

      const transporter = nodemailer.createTransport(
        smtpTransport({
          service: smtpSettings.service,
          auth: {
            user: smtpSettings.user,
            pass: smtpSettings.pass
          }
        }))

      const mailOptions = {
        from: '"Do Not Reply, Cinemas Company 👥" <[email protected]>',
        to: `${payload.user.email}`,
        subject: `Tickects for movie ${payload.movie.title}`,
        html: `
            <h1>Tickest for ${payload.movie.title}</h1>

            <p>Cinem: ${payload.cinema.name}</p>
            <p>Room: ${payload.cinema.room}</p>
            <p>Seats: ${payload.cinema.seats}</p>

            <p>description: ${payload.description}</p>

            <p>Total: ${payload.totalAmount}</p>
            <p>Total: ${payload.orderId}</p>

            <h3>Cinemas Microserivce 2017, Enjoy your movie !</h3>
          `
      }

      transporter.sendMail(mailOptions, (err, info) => {
        if (err) {
          reject(new Error('An error occured sending an email, err:' + err))
        }
        transporter.close()
        resolve(info)
      })
    })
  }