sea

type DbOp interface {

	//check if user is existed
	UserExisted(id string) bool
	//add a user
	AddUser(id string, v *map[string]string) error
	//get user all info
	GetUserAll(id string) (v *map[string]string, err error)
	//get user specific info
	//GetUserInfo(id string) (info string, err error)
	//delete a user
	DeleteUser(id string) error
}

type SeaClient struct {
	// contains filtered or unexported fields
}

type SeedOp interface {
	//add id as preparation
	AddPreparation(id string, override bool, more ...string) error
	//delete all seed data including preparation id
	ClearAllSeeds()

	//check if user is a seed
	UserIsSeed(id string) bool
	//mark user as a seed. if user does not exist, add it
	MarkSeed(id string) error
	//unmark user
	UnmarkSeed(id string) error
	//unmark all seeds
	//UnmarkAllSeeds()
	//pick a user as seed, user will be mark as seed
	GetSeed(pick func(interface{}) bool) (id string, err error)
}