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'use strict'
const waterfall = require('async/waterfall')
const eachSeries = require('async/eachSeries')
const fs = require('fs')
const path = require('path')
const constants = require('./constants')
const db = require('./database')
const logger = require('../helpers/logger')
const migrator = {
migrate: migrate
}
function migrate (finalCallback) {
waterfall([
function checkApplicationTableExists (callback) {
db.sequelize.getQueryInterface().showAllTables().asCallback(function (err, tables) {
if (err) return callback(err)
// No tables, we don't need to migrate anything
// The installer will do that
if (tables.length === 0) return finalCallback(null)
return callback(null)
})
},
function loadMigrationVersion (callback) {
db.Application.loadMigrationVersion(callback)
},
function createMigrationRowIfNotExists (actualVersion, callback) {
if (actualVersion === null) {
db.Application.create({
migrationVersion: 0
}, function (err) {
return callabck(err, 0)
})
}
return callback(null, actualVersion)
},
function abortMigrationIfNotNeeded (actualVersion, callback) {
// No need migrations
if (actualVersion >= constants.LAST_MIGRATION_VERSION) return finalCallback(null)
return callback(null, actualVersion)
},
function getMigrations (actualVersion, callback) {
// If there are a new migration scripts
logger.info('Begin migrations.')
getMigrationScripts(function (err, migrationScripts) {
return callback(err, actualVersion, migrationScripts)
})
},
function doMigrations (actualVersion, migrationScripts, callback) {
eachSeries(migrationScripts, function (entity, callbackEach) {
executeMigration(actualVersion, entity, callbackEach)
}, function (err) {
if (err) return callback(err)
logger.info('Migrations finished. New migration version schema: %s', constants.LAST_MIGRATION_VERSION)
return callback(null)
})
}
], finalCallback)
}
// ---------------------------------------------------------------------------
module.exports = migrator
// ---------------------------------------------------------------------------
function getMigrationScripts (callback) {
fs.readdir(path.join(__dirname, 'migrations'), function (err, files) {
if (err) return callback(err)
const filesToMigrate = []
files.forEach(function (file) {
// Filename is something like 'version-blabla.js'
const version = file.split('-')[0]
filesToMigrate.push({
version,
script: file
})
})
return callback(err, filesToMigrate)
})
}
function executeMigration (actualVersion, entity, callback) {
const versionScript = parseInt(entity.version)
// Do not execute old migration scripts
if (versionScript <= actualVersion) return callback(null)
// Load the migration module and run it
const migrationScriptName = entity.script
logger.info('Executing %s migration script.', migrationScriptName)
const migrationScript = require(path.join(__dirname, 'migrations', migrationScriptName))
db.sequelize.transaction().asCallback(function (err, t) {
if (err) return callback(err)
const options = {
transaction: t,
queryInterface: db.sequelize.getQueryInterface(),
sequelize: db.sequelize,
Sequelize: db.Sequelize
}
migrationScript.up(options, function (err) {
if (err) {
t.rollback()
return callback(err)
}
// Update the new migration version
db.Application.updateMigrationVersion(versionScript, t, function (err) {
if (err) {
t.rollback()
return callback(err)
}
t.commit().asCallback(callback)
})
})
})
}
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