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utils.js
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utils.js
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import fs from 'fs'
import util from 'util'
const setTimeoutPromised = util.promisify(setTimeout)
const readdir = util.promisify(fs.readdir)
const readFile = util.promisify(fs.readFile)
const writeFile = util.promisify(fs.writeFile)
const mkdir = util.promisify(fs.mkdir)
const access = util.promisify(fs.access)
async function fileExists(path) {
try {
await access(path)
return true
} catch (e) {
if (e.code == 'ENOENT') {
return false
} else {
throw e
}
}
}
async function sleep(seconds) {
await setTimeoutPromised(seconds * 1000)
}
async function tryWithBackoff(time, max, action, description) {
try {
return await action()
} catch (e) {
console.error(e)
console.error(`Failed ${description}, sleeping ${time}s then retrying`)
await sleep(time)
let nextTime = time * 2
if (nextTime <= max) {
return await tryWithBackoff(nextTime, max, action, description)
} else {
throw e
}
}
}
export {readdir, readFile, writeFile, mkdir, fileExists, sleep, tryWithBackoff}