function init() {
  console.log('start db setting...')
  waterfall([
    getToken,
    getServerList,
    getDungeonImage
  ], function(err,result){
    //console.log(result)
    createDB('tokenDB')
    createDB('baseDB')
    setDB('token',result['token'],'tokenDB')
    setDB('serverList',result['serverList'],'baseDB')
    setDB('dungeonImage',result['dungeonImage'],'baseDB')
    baseDB['serverList']['realms'].forEach(server=>{
      createServerDB(server['slug'])
    })
    console.log('end db setting...')
  })
}