standardnotes-server/packages/revisions/src/Bootstrap/DataSource.ts

import { DataSource, LoggerOptions } from 'typeorm'

import { TypeORMRevision } from '../Infra/TypeORM/TypeORMRevision'

import { Env } from './Env'

const env: Env = new Env()
env.load()

const maxQueryExecutionTime = env.get('DB_MAX_QUERY_EXECUTION_TIME', true)
  ? +env.get('DB_MAX_QUERY_EXECUTION_TIME', true)
  : 45_000

const inReplicaMode = env.get('DB_REPLICA_HOST', true) ? true : false

const replicationConfig = {
  master: {
    host: env.get('DB_HOST'),
    port: parseInt(env.get('DB_PORT')),
    username: env.get('DB_USERNAME'),
    password: env.get('DB_PASSWORD'),
    database: env.get('DB_DATABASE'),
  },
  slaves: [
    {
      host: env.get('DB_REPLICA_HOST', true),
      port: parseInt(env.get('DB_PORT')),
      username: env.get('DB_USERNAME'),
      password: env.get('DB_PASSWORD'),
      database: env.get('DB_DATABASE'),
    },
  ],
  removeNodeErrorCount: 10,
  restoreNodeTimeout: 5,
}

const dataSource = new DataSource({
  type: 'mysql',
  charset: 'utf8mb4',
  supportBigNumbers: true,
  bigNumberStrings: false,
  maxQueryExecutionTime,
  replication: inReplicaMode ? replicationConfig : undefined,
  host: inReplicaMode ? undefined : env.get('DB_HOST'),
  port: inReplicaMode ? undefined : parseInt(env.get('DB_PORT')),
  username: inReplicaMode ? undefined : env.get('DB_USERNAME'),
  password: inReplicaMode ? undefined : env.get('DB_PASSWORD'),
  database: inReplicaMode ? undefined : env.get('DB_DATABASE'),
  entities: [TypeORMRevision],
  migrations: [env.get('DB_MIGRATIONS_PATH', true) ?? 'dist/migrations/*.js'],
  migrationsRun: true,
  logging: <LoggerOptions>env.get('DB_DEBUG_LEVEL'),
})

export const AppDataSource = dataSource