server/initializers/migrator.ts

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