Run database migrations automatically on startup

Instead of using sequelize-cli and ensure migrations by shellscript,
this patch automates database migrations properly to the umzug library.
The sequelize CLI becomes a dev dependencies as it's still useful for
generating migrations.

This should eliminate the need for crude generating of database config
files and alike. Instead we utilize the pre-configured sequelize
connection that CodiMD will use anyway.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

src/lib/models/index.ts

@@ -1,5 +1,6 @@
 import { Sequelize } from 'sequelize-typescript'
 import { cloneDeep } from 'lodash'
+import * as path from 'path'
 import { Author } from './author'
 import { Note } from './note'
 import { Revision } from './revision'
@@ -7,6 +8,8 @@ import { Temp } from './temp'
 import { User } from './user'
 import { logger } from '../logger'
 import { config } from '../config'
+import Umzug from 'umzug'
+import SequelizeTypes from 'sequelize'
 
 const dbconfig = cloneDeep(config.db)
 dbconfig.logging = config.debug ? (data): void => {
@@ -22,6 +25,36 @@ if (config.dbURL) {
   sequelize = new Sequelize(dbconfig.database, dbconfig.username, dbconfig.password, dbconfig)
 }
 
+const umzug = new Umzug({
+  migrations: {
+    path: path.resolve(__dirname, '..', 'migrations'),
+    params: [
+      sequelize.getQueryInterface(),
+      SequelizeTypes
+    ]
+  },
+  // 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
+  }
+})
+
+export async function runMigrations(): Promise<void> {
+  // 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')
+}
+
 sequelize.addModels([Author, Note, Revision, Temp, User])
 
 export { Author, Note, Revision, Temp, User }