server/initializers/migrator.ts

   1 import * as path from 'path'
   2 import { readdirPromise } from '../helpers/core-utils'
   3 import { logger } from '../helpers/logger'
   4 import { LAST_MIGRATION_VERSION } from './constants'
   5 import { sequelizeTypescript } from './database'
   6
   7 async function migrate () {
   8   const tables = await sequelizeTypescript.getQueryInterface().showAllTables()
   9
  10   // No tables, we don't need to migrate anything
  11   // The installer will do that
  12   if (tables.length === 0) return
  13
  14   let actualVersion: number = null
  15
  16   // Search in "Applications" or "application" tables
  17   try {
  18     const [ rows ] = await sequelizeTypescript.query('SELECT "migrationVersion" FROM "Applications"')
  19     if (rows && rows[ 0 ] && rows[ 0 ].migrationVersion) {
  20       actualVersion = rows[ 0 ].migrationVersion
  21     }
  22   } catch {
  23     const [ rows ] = await sequelizeTypescript.query('SELECT "migrationVersion" FROM "application"')
  24     if (rows && rows[0] && rows[0].migrationVersion) {
  25       actualVersion = rows[0].migrationVersion
  26     }
  27   }
  28
  29   if (actualVersion === null) {
  30     await sequelizeTypescript.query('INSERT INTO "application" ("migrationVersion") VALUES (0)')
  31     actualVersion = 0
  32   }
  33
  34   // No need migrations, abort
  35   if (actualVersion >= LAST_MIGRATION_VERSION) return
  36
  37   // If there are a new migration scripts
  38   logger.info('Begin migrations.')
  39
  40   const migrationScripts = await getMigrationScripts()
  41
  42   for (const migrationScript of migrationScripts) {
  43     try {
  44       await executeMigration(actualVersion, migrationScript)
  45     } catch (err) {
  46       logger.error('Cannot execute migration %s.', migrationScript.version, err)
  47       process.exit(-1)
  48     }
  49   }
  50
  51   logger.info('Migrations finished. New migration version schema: %s', LAST_MIGRATION_VERSION)
  52 }
  53
  54 // ---------------------------------------------------------------------------
  55
  56 export {
  57   migrate
  58 }
  59
  60 // ---------------------------------------------------------------------------
  61
  62 async function getMigrationScripts () {
  63   const files = await readdirPromise(path.join(__dirname, 'migrations'))
  64   const filesToMigrate: {
  65     version: string,
  66     script: string
  67   }[] = []
  68
  69   files
  70     .filter(file => file.endsWith('.js.map') === false)
  71     .forEach(file => {
  72       // Filename is something like 'version-blabla.js'
  73       const version = file.split('-')[0]
  74       filesToMigrate.push({
  75         version,
  76         script: file
  77       })
  78     })
  79
  80   return filesToMigrate
  81 }
  82
  83 async function executeMigration (actualVersion: number, entity: { version: string, script: string }) {
  84   const versionScript = parseInt(entity.version, 10)
  85
  86   // Do not execute old migration scripts
  87   if (versionScript <= actualVersion) return undefined
  88
  89   // Load the migration module and run it
  90   const migrationScriptName = entity.script
  91   logger.info('Executing %s migration script.', migrationScriptName)
  92
  93   const migrationScript = require(path.join(__dirname, 'migrations', migrationScriptName))
  94
  95   return sequelizeTypescript.transaction(async t => {
  96     const options = {
  97       transaction: t,
  98       queryInterface: sequelizeTypescript.getQueryInterface(),
  99       sequelize: sequelizeTypescript
 100     }
 101
 102     await migrationScript.up(options)
 103
 104     // Update the new migration version
 105     await sequelizeTypescript.query('UPDATE "application" SET "migrationVersion" = ' + versionScript, { transaction: t })
 106   })
 107 }