/*
Write a time-stamped entry to user's bux log. This function is
public because sometimes a log entry unrelated to adding or subtracting
SkilBux is needed.
*/
func Log(user string, amount interface{}, comment string) error {
switch v := amount.(type) {
case int:
amount = strconv.Itoa(v)
}
if !h.IsUser(user) {
return fmt.Errorf(NOTUSER)
}
return log(user, amount.(string), comment)
}
/*
Debit the current user and credit to target user. Only positive
numbers allowed. Not designed for high volume usage (no transactional
locking). Transfers to the same person from blocked.
*/
func Transfer(to string, amount interface{}, comment string) error {
var err error
if !h.IsUser(to) {
return fmt.Errorf(NOTUSER)
}
switch v := amount.(type) {
case string:
if amount, err = strconv.Atoi(v); err != nil {
return err
}
}
current, err := u.Current()
if err != nil {
return err
}
from := current.Username
if to == from {
return fmt.Errorf(SAME)
}
has, err := read(from)
if err != nil {
return err
}
if amount.(int) < 1 {
return fmt.Errorf(NEEDSPOS)
}
if amount.(int) > has {
return fmt.Errorf(NOTENOUGH)
}
// TODO make Add + Sub atomic transaction (but will need db)
if err = Adjust(amount.(int), to, "from "+from+": "+comment); err != nil {
return err
}
if err = Adjust(-amount.(int), from, "to "+to+": "+comment); err != nil {
return err
}
return nil
}
// Returns Bux for given user or 0 if error. Always check for error.
func Get(u string) (int, error) {
if !h.IsUser(u) {
return 0, fmt.Errorf(NOTUSER)
}
return read(u)
}