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'use strict'
const crypto = require('crypto')
const retry = require('async/retry')
const logger = require('./logger')
const utils = {
badRequest,
cleanForExit,
generateRandomString,
isTestInstance,
getFormatedObjects,
retryWrapper,
transactionRetryer
}
function badRequest (req, res, next) {
res.type('json').status(400).end()
}
function generateRandomString (size, callback) {
crypto.pseudoRandomBytes(size, function (err, raw) {
if (err) return callback(err)
callback(null, raw.toString('hex'))
})
}
function cleanForExit (webtorrentProcess) {
logger.info('Gracefully exiting.')
process.kill(-webtorrentProcess.pid)
}
function isTestInstance () {
return (process.env.NODE_ENV === 'test')
}
function getFormatedObjects (objects, objectsTotal) {
const formatedObjects = []
objects.forEach(function (object) {
formatedObjects.push(object.toFormatedJSON())
})
return {
total: objectsTotal,
data: formatedObjects
}
}
// { arguments, errorMessage }
function retryWrapper (functionToRetry, options, finalCallback) {
const args = options.arguments ? options.arguments : []
utils.transactionRetryer(
function (callback) {
return functionToRetry.apply(this, args.concat([ callback ]))
},
function (err) {
if (err) {
logger.error(options.errorMessage, { error: err })
}
// Do not return the error, continue the process
return finalCallback(null)
}
)
}
function transactionRetryer (func, callback) {
retry({
times: 5,
errorFilter: function (err) {
const willRetry = (err.name === 'SequelizeDatabaseError')
logger.debug('Maybe retrying the transaction function.', { willRetry })
return willRetry
}
}, func, callback)
}
// ---------------------------------------------------------------------------
module.exports = utils
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