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import * as path from 'path'
import * as Promise from 'bluebird'
import { database as db } from './database'
import { LAST_MIGRATION_VERSION } from './constants'
import { logger, readdirPromise } from '../helpers'
function migrate () {
const p = db.sequelize.getQueryInterface().showAllTables()
.then(tables => {
// No tables, we don't need to migrate anything
// The installer will do that
if (tables.length === 0) throw null
})
.then(() => {
return db.Application.loadMigrationVersion()
})
.then(actualVersion => {
if (actualVersion === null) {
return db.Application.create({ migrationVersion: 0 }).then(() => 0)
}
return actualVersion
})
.then(actualVersion => {
// No need migrations, abort
if (actualVersion >= LAST_MIGRATION_VERSION) throw null
return actualVersion
})
.then(actualVersion => {
// If there are a new migration scripts
logger.info('Begin migrations.')
return getMigrationScripts().then(migrationScripts => ({ actualVersion, migrationScripts }))
})
.then(({ actualVersion, migrationScripts }) => {
return Promise.each(migrationScripts, entity => executeMigration(actualVersion, entity))
})
.then(() => {
logger.info('Migrations finished. New migration version schema: %s', LAST_MIGRATION_VERSION)
})
.catch(err => {
if (err === null) return undefined
throw err
})
return p
}
// ---------------------------------------------------------------------------
export {
migrate
}
// ---------------------------------------------------------------------------
function getMigrationScripts () {
return readdirPromise(path.join(__dirname, 'migrations')).then(files => {
const filesToMigrate: {
version: string,
script: string
}[] = []
files.forEach(function (file) {
// Filename is something like 'version-blabla.js'
const version = file.split('-')[0]
filesToMigrate.push({
version,
script: file
})
})
return filesToMigrate
})
}
function executeMigration (actualVersion: number, entity: { version: string, script: string }) {
const versionScript = parseInt(entity.version, 10)
// Do not execute old migration scripts
if (versionScript <= actualVersion) return undefined
// 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))
return db.sequelize.transaction(t => {
const options = {
transaction: t,
queryInterface: db.sequelize.getQueryInterface(),
sequelize: db.sequelize
}
migrationScript.up(options)
.then(() => {
// Update the new migration version
db.Application.updateMigrationVersion(versionScript, t)
})
})
}
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