MongoHelper.scala

package com.drwal.utils

import akka.pattern.ask
import akka.util.Timeout

import scala.concurrent.duration._
import scala.util.{Failure, Success, Try, Properties}
import scala.concurrent._

import reactivemongo.api.{MongoConnection, MongoDriver, DB}

import org.slf4j.LoggerFactory

import com.drwal.utils.BackendConfig.MongoConfig


trait MongoHelper {

  def connnectToDb(): Future[DB] = {
    import scala.concurrent.ExecutionContext.Implicits.global

    val promise = Promise[DB]()
    val driver = new MongoDriver
    val connection: Try[MongoConnection] = MongoConnection.parseURI(MongoConfig.uri).map { parsedUri => driver.connection(parsedUri) }

    connection match {
      case Success(con) => promise.success(con(MongoConfig.database))
      case Failure(e) => throw new IllegalStateException("should not have come here")
    }
    promise.future
  }

  def resolveConnectToDb(): DB = {
    val log = LoggerFactory.getLogger(getClass)
    implicit val timeout = Timeout(10 seconds)
    lazy val db = connnectToDb()

    log.info("resolveConnectToDb = " + db)
    Await.result(db, timeout.duration).asInstanceOf[DB]
  }

}