Waits for a URL to return 200 for a specified time, exits 1 if it is not available

wait-for-it.js

/**
 * Wait For It
 *
 * Given Env Vars of:
 *
 * - VALIDATE_URL: a fully qualified url starting with https:// that we want to validate
 * - TIME_ALLOWED_IN_SECONDS: timeout we want to wait until we mark this URL dead. Defaults 30
 * - TIME_BETWEEN_TRIES_IN_SECONDS: timeout between requests to the URL. Defaults to 1
 */
const https = require('https')

const getCurrentTimeInSeconds = () => Date.now() / 1000

let start = getCurrentTimeInSeconds()
const timeAllowedInSeconds = Number(process.env.TIME_ALLOWED_IN_SECONDS || 30)
const timeToWaitInSeconds = Number(
  process.env.TIME_BETWEEN_TRIES_IN_SECONDS || 1
)

const runIn = (ms) =>
  setTimeout(() => {
    console.log('Requesting ', process.env.VALIDATE_URL)

    https.get(process.env.VALIDATE_URL, (res) => {
      if (res.statusCode !== 200) {
        console.log('URL Not Validated', res.statusCode)

        if (getCurrentTimeInSeconds() > timeAllowedInSeconds + start) {
          console.log(
            `Failed for timeout of "${timeAllowedInSeconds}" seconds. Failing exit code 1`
          )

          process.exit(1)
        } else {
          runIn(ms)
        }
      } else {
        console.log('URL Validated')

        process.exit(0)
      }
    })
  }, ms)

runIn(timeToWaitInSeconds * 1000)