updater

type DNSClient interface {
	GetCurrentIP(ctx context.Context) (string, error)
	UpdateIP(ctx context.Context, newIP string) error
}

type Options struct {
	Force      bool
	DryRun     bool
	Quiet      bool
	Verbose    bool   // emit per-step diagnostic output (source choice, interface, TTL)
	OverrideIP string // empty = resolve via myip.GetPublicIP (default cron behavior)

	// Client, if set, replaces the Route53 client the updater would otherwise
	// construct from cfg. Intended for tests and for the serve handler.
	Client DNSClient
}

type Result struct {
	Action   string // "updated" | "nochg-cache" | "nochg-dns" | "dry-run"
	OldIP    string
	NewIP    string
	Hostname string
}