dyndns

type Config struct {
	// Detectors quorum the public IP. Default: HTTPDetector against
	// icanhazip.com + ifconfig.me + ipify.org (need ≥ 2 agreeing).
	Detectors []IPDetector

	// PollInterval is the steady-state interval between IP checks.
	// Default 5m. Must be >= 30s.
	PollInterval time.Duration

	// QuorumSize is the number of detectors that must agree before
	// an update fires. Default = (len(Detectors)+1)/2 — simple
	// majority. Set to 1 for single-source mode.
	QuorumSize int

	// MaxBackoff caps the exponential backoff applied after
	// consecutive Update failures. Default 1h.
	MaxBackoff time.Duration

	// Update is the callback that applies a new IP to DNS.
	Update Updater

	// Now is injectable for tests. Defaults to time.Now.
	Now func() time.Time

	// Sleep is injectable for tests. Defaults to time.Sleep.
	Sleep func(time.Duration)
}

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

type HTTPDetector struct {
	URL   string
	Label string
	HTTP  *http.Client
}

type IPDetector interface {
	Detect(ctx context.Context) (net.IP, error)
	Name() string
}

type Updater func(ctx context.Context, ip net.IP) error