zones: add initial m/ scanner

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

pkg/zones/machine.go

@@ -0,0 +1,40 @@
+package zones
+
+import (
+	"strconv"
+	"sync"
+)
+
+// A Machine is a machine on a Zone
+type Machine struct {
+	mu sync.Mutex
+
+	zone *Zone
+	id   int
+	Name string
+}
+
+func (m *Machine) String() string {
+	return m.Name
+}
+
+// ID return the index within the [Zone] associated to this [Machine]
+func (m *Machine) ID() int {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.id == 0 {
+		zoneName := m.zone.Name
+
+		s := m.Name[len(zoneName)+1:]
+
+		id, err := strconv.ParseInt(s, 10, 8)
+		if err != nil {
+			panic(err)
+		}
+
+		m.id = int(id)
+	}
+
+	return m.id
+}