overleaf/services/document-updater/test/cluster_failover/coffee/test_pubsub_failover.js

/* eslint-disable
    no-return-assign,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let sendPings
const redis = require('@overleaf/redis-wrapper')
const rclient1 = redis.createClient({
  cluster: [
    {
      port: '7000',
      host: 'localhost'
    }
  ]
})

const rclient2 = redis.createClient({
  cluster: [
    {
      port: '7000',
      host: 'localhost'
    }
  ]
})

let counter = 0
const sendPing = function (cb) {
  if (cb == null) {
    cb = function () {}
  }
  return rclient1.publish('test-pubsub', counter, (error) => {
    if (error != null) {
      console.error('[SENDING ERROR]', error.message)
    }
    if (error == null) {
      counter += 1
    }
    return cb()
  })
}

let previous = null
rclient2.subscribe('test-pubsub')
rclient2.on('message', (channel, value) => {
  value = parseInt(value, 10)
  if (value % 10 === 0) {
    console.log('.')
  }
  if (previous != null && value !== previous + 1) {
    console.error(
      '[RECEIVING ERROR]',
      `Counter not in order. Got ${value}, expected ${previous + 1}`
    )
  }
  return (previous = value)
})

const PING_DELAY = 100
;(sendPings = () => sendPing(() => setTimeout(sendPings, PING_DELAY)))()