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'use strict'
const validate = require('aproba')
const log = require('npmlog')
const Bluebird = require('bluebird')

let pulsers = 0
let pulse

function pulseStart (prefix) {
  if (++pulsers > 1) return
  pulse = setInterval(function () {
    log.gauge.pulse(prefix)
  }, 150)
}
function pulseStop () {
  if (--pulsers > 0) return
  clearInterval(pulse)
}

module.exports = function (prefix, cb) {
  validate('SF', [prefix, cb])
  if (!prefix) prefix = 'network'
  pulseStart(prefix)
  return function () {
    pulseStop()
    cb.apply(null, arguments)
  }
}
module.exports.withPromise = pulseWhile

function pulseWhile (prefix, promise) {
  if (!promise) {
    promise = prefix
    prefix = ''
  }
  pulseStart(prefix)
  return Bluebird.resolve(promise).finally(() => pulseStop())
}