ping-staging-apps.js

#!/usr/bin/env node

// [start-readme]
//
// This script finds all Heroku staging apps and pings them to make sure they're always "warmed" and responsive to requests.
//
// [end-readme]

require('dotenv').config()
const assert = require('assert')
const got = require('got')

assert(process.env.HEROKU_API_TOKEN)

const { chain } = require('lodash')
const chalk = require('chalk')
const Heroku = require('heroku-client')
const heroku = new Heroku({ token: process.env.HEROKU_API_TOKEN })

main()

async function main () {
  const apps = chain(await heroku.get('/apps'))
    .orderBy('name')
    .value()

  async function ping (app) {
    // ?warmup param has no effect but makes it easier to find these requests in the logs
    const url = `https://${app.name}.herokuapp.com/en?warmup`
    try {
      const response = await got(url)
      console.log(chalk.green(url, response.statusCode))
    } catch (error) {
      console.log(chalk.red(url, error.response.statusCode))
    }
  }

  Promise.all(apps.map(ping))
}