// BeforeFunc spies on cfg.BeforeFunc calls, sending passed time.Time
// to the returned channel.
//
// If cfg.BeforeFunc is non-nil, it is called after the value is sent.
func (d *Driver) BeforeFunc(cfg *keygen.Config) <-chan time.Time {
ch := make(chan time.Time, d.ChanCap)
fn := cfg.BeforeFunc
cfg.BeforeFunc = func(t time.Time) bool {
ch <- t
if fn != nil {
return fn(t)
}
return keygen.DefaultBefore(t)
}
return ch
}
