Run database migrations automatically on startup

This commit removes the need for separate migrations with the sequelize-cli
by running them with umzug on application startup.

This is a port of #384

Co-authored-by: Sheogorath <sheogorath@shivering-isles.com>
Signed-off-by: David Mehren <git@herrmehren.de>

lib/models/index.js

@@ -4,6 +4,7 @@ const fs = require('fs')
 const path = require('path')
 const Sequelize = require('sequelize')
 const { cloneDeep } = require('lodash')
+const Umzug = require('umzug')
 
 // core
 const config = require('../config')
@@ -57,6 +58,36 @@ Object.keys(db).forEach(function (modelName) {
   }
 })
 
+const umzug = new Umzug({
+  migrations: {
+    path: path.resolve(__dirname, '..', 'migrations'),
+    params: [
+      sequelize.getQueryInterface(),
+      Sequelize.DataTypes
+    ]
+  },
+  // Required wrapper function required to prevent winstion issue
+  // https://github.com/winstonjs/winston/issues/1577
+  logging: message => {
+    logger.info(message)
+  },
+  storage: 'sequelize',
+  storageOptions: {
+    sequelize: sequelize
+  }
+})
+
+db.runMigrations = async function runMigrations () {
+  // checks migrations and run them if they are not already applied
+  // exit in case of unsuccessful migrations
+  await umzug.up().catch(error => {
+    logger.error(error)
+    logger.error('Database migration failed. Exiting…')
+    process.exit(1)
+  })
+  logger.info('All migrations performed successfully')
+}
+
 db.sequelize = sequelize
 db.Sequelize = Sequelize