zones: calculate Machine.ID on init

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/machine_scan.go

@@ -3,6 +3,7 @@ package zones
 import (
 	"context"
 	"net/netip"
+	"strconv"
 	"time"
 )
 
@@ -26,6 +27,10 @@ func (m *Machine) updatePublicAddresses() error {
 }
 
 func (m *Machine) init() error {
+	if err := m.setID(); err != nil {
+		return err
+	}
+
 	for i := 0; i < RingsCount; i++ {
 		if err := m.tryReadWireguardKeys(i); err != nil {
 			return err
@@ -34,6 +39,19 @@ func (m *Machine) init() error {
 	return nil
 }
 
+func (m *Machine) setID() error {
+	zoneName := m.zone.Name
+	suffix := m.Name[len(zoneName)+1:]
+
+	id, err := strconv.ParseInt(suffix, 10, 8)
+	if err != nil {
+		return err
+	}
+
+	m.ID = int(id)
+	return nil
+}
+
 func (m *Machine) scan() error {
 	for i := 0; i < RingsCount; i++ {
 		if err := m.tryApplyWireguardConfig(i); err != nil {