package lib import ( "github.com/hashicorp/go-uuid" ) // UUIDCheckFunc should determine whether the given UUID is actually // unique and allowed to be used type UUIDCheckFunc func(string) (bool, error) func GenerateUUID(checkFn UUIDCheckFunc) (string, error) { for { id, err := uuid.GenerateUUID() if err != nil { return "", err } if checkFn == nil { return id, nil } if ok, err := checkFn(id); err != nil { return "", err } else if ok { return id, nil } } }