common service

director

├── common
├── component
├── essential
│   ├── api
│   └── config
│   └── logger
│   └── scheduler
│   └── storage
│   └── ticker
│   └── scmd
├── app
│   └── server
├── migration
├── module
│   ├── assist
│   └── auditlog

• common common function or const, stateless
• essential essential module, stateful
• main where main.go location
• migration database migration
• module modules location

how to use