overleaf/services/document-updater/test/cluster_failover/js/test_blpop_failover.js

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let listenInBackground, sendPings
const redis = require('@overleaf/redis-wrapper')
const rclient1 = redis.createClient({
cluster: [
{
port: '7000',
host: '127.0.0.1',
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},
],
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})
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const rclient2 = redis.createClient({
cluster: [
{
port: '7000',
host: '127.0.0.1',
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},
],
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})
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let counter = 0
const sendPing = function (cb) {
if (cb == null) {
cb = function () {}
}
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return rclient1.rpush('test-blpop', counter, error => {
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if (error != null) {
console.error('[SENDING ERROR]', error.message)
}
if (error == null) {
counter += 1
}
return cb()
})
}
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let previous = null
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const listenForPing = cb =>
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rclient2.blpop('test-blpop', 200, (error, result) => {
if (error != null) {
return cb(error)
}
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let [, value] = Array.from(result)
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value = parseInt(value, 10)
if (value % 10 === 0) {
console.log('.')
}
if (previous != null && value !== previous + 1) {
error = new Error(
`Counter not in order. Got ${value}, expected ${previous + 1}`
)
}
previous = value
return cb(error, value)
})
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const PING_DELAY = 100
;(sendPings = () => sendPing(() => setTimeout(sendPings, PING_DELAY)))()
;(listenInBackground = () =>
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listenForPing(error => {
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if (error) {
console.error('[RECEIVING ERROR]', error.message)
}
return setTimeout(listenInBackground)
}))()