dns: introduce AddrRecord{} to abstract A/AAAA entries

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

pkg/dns/dns.go

@@ -0,0 +1,2 @@
+// Package dns manages DNS entries for the cluster
+package dns

pkg/dns/record.go

@@ -0,0 +1,38 @@
+package dns
+
+import (
+	"net/netip"
+	"sort"
+	"time"
+
+	"darvaza.org/core"
+	"github.com/libdns/libdns"
+)
+
+// AddrRecord represents an A or AAAA record
+type AddrRecord struct {
+	Name string
+	Addr []netip.Addr
+}
+
+// Sort sorts the addresses of the record
+func (rr *AddrRecord) Sort() {
+	sort.Slice(rr.Addr, func(i, j int) bool {
+		return rr.Addr[i].Less(rr.Addr[j])
+	})
+}
+
+// Export converts the record into libdns.Record
+func (rr *AddrRecord) Export() []libdns.Record {
+	out := make([]libdns.Record, len(rr.Addr))
+	for i, addr := range rr.Addr {
+		out[i] = libdns.Record{
+			Name:  rr.Name,
+			TTL:   time.Second * 1,
+			Type:  core.IIf(addr.Is6(), "AAAA", "A"),
+			Value: addr.String(),
+		}
+	}
+
+	return out
+}