dns: introduce initial DNS Manager

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

pkg/dns/dns.go

@@ -1,2 +1,38 @@
 // Package dns manages DNS entries for the cluster
 package dns
+
+import (
+	"fmt"
+	"net/netip"
+)
+
+// Zone represents a set of hosts with high affinity
+type Zone struct {
+	Name string
+
+	Hosts map[int]*Host
+}
+
+func (z *Zone) String() string {
+	if z == nil {
+		return "undetermined"
+	}
+	return z.Name
+}
+
+// Host represents a member of the cluster
+type Host struct {
+	zone *Zone
+
+	ID     int
+	Active bool
+	Addrs  []netip.Addr
+}
+
+func (p *Host) String() string {
+	if p == nil {
+		return "undetermined"
+	}
+
+	return fmt.Sprintf("%s-%v", p.zone, p.ID)
+}