await-db.js

async function testConnection (db) {
  try {
    const c = await db.connect()
    c.done()
    console.log('CONNECTED')
  } catch (error) {
    console.log('RETRYING CONNECTION')
    await testConnection(db)
  }
}

const wait = delay => {
  return new Promise(resolve => {
    setTimeout(() => { resolve() }, delay)
  })
}

function waitForDb (db) {
  return new Promise(async (resolve, reject) => {
    let count = 0
    let dbReady = false

    while (dbReady && count <= 6) {
      count++

      try {
        const c = await db.connect()
        c.done()
        dbReady = true
        console.log('CONNECTED TO DATABASE')
      } catch (error) {
        console.log('DATABASE ISNT READY, RETRYING')
      }

      await wait(count * count * 1000)
    }

    if (count > 6) reject()
    resolve()
  })
}