fix(portforward): trigger after VPN restart

internal/portforward/settings.go

@@ -0,0 +1,43 @@
+package portforward
+
+import (
+	"github.com/qdm12/gluetun/internal/portforward/service"
+	"github.com/qdm12/gosettings"
+)
+
+type Settings struct {
+	// VPNIsUp can be optionally set to signal the loop
+	// the VPN is up (true) or down (false). If left to nil,
+	// it is assumed the VPN is in the same previous state.
+	VPNIsUp *bool
+	Service service.Settings
+}
+
+// updateWith deep copies the receiving settings, overrides the copy with
+// fields set in the partialUpdate argument, validates the new settings
+// and returns them if they are valid, or returns an error otherwise.
+// In all cases, the receiving settings are unmodified.
+func (s Settings) updateWith(partialUpdate Settings) (updated Settings, err error) {
+	updated = s.copy()
+	updated.overrideWith(partialUpdate)
+	err = updated.validate()
+	if err != nil {
+		return updated, err
+	}
+	return updated, nil
+}
+
+func (s Settings) copy() (copied Settings) {
+	copied.VPNIsUp = gosettings.CopyPointer(s.VPNIsUp)
+	copied.Service = s.Service.Copy()
+	return copied
+}
+
+func (s *Settings) overrideWith(update Settings) {
+	s.VPNIsUp = gosettings.OverrideWithPointer(s.VPNIsUp, update.VPNIsUp)
+	s.Service.OverrideWith(update.Service)
+}
+
+func (s Settings) validate() (err error) {
+	return s.Service.Validate()
+}