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'use strict'
const retry = require('async/retry')
const db = require('../initializers/database')
const logger = require('./logger')
const utils = {
commitTransaction,
retryTransactionWrapper,
rollbackTransaction,
startSerializableTransaction,
transactionRetryer
}
function commitTransaction (t, callback) {
return t.commit().asCallback(callback)
}
function rollbackTransaction (err, t, callback) {
// Try to rollback transaction
if (t) {
// Do not catch err, report the original one
t.rollback().asCallback(function () {
return callback(err)
})
} else {
return callback(err)
}
}
// { arguments, errorMessage }
function retryTransactionWrapper (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)
}
function startSerializableTransaction (callback) {
console.log(db)
db.sequelize.transaction({ isolationLevel: 'SERIALIZABLE' }).asCallback(function (err, t) {
// We force to return only two parameters
return callback(err, t)
})
}
// ---------------------------------------------------------------------------
module.exports = utils
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