plugin/secondary: parse catalog zones after transfer (#8209)

plugin/secondary/catalog.go

@@ -0,0 +1,39 @@
+package secondary
+
+import (
+	"github.com/coredns/coredns/plugin/file"
+	"github.com/coredns/coredns/plugin/pkg/catalog"
+	"github.com/coredns/coredns/plugin/transfer"
+
+	"github.com/miekg/dns"
+)
+
+func (s *Secondary) transferIn(origin string, z *file.Zone, t *transfer.Transfer) error {
+	if _, ok := s.catalogZones[origin]; !ok {
+		return z.TransferIn(t)
+	}
+
+	var parsed *catalog.Catalog
+	if err := z.TransferInWithRecords(t, func(rrs []dns.RR) error {
+		cat, err := catalog.Parse(origin, rrs)
+		if err != nil {
+			return err
+		}
+		parsed = cat
+		return nil
+	}); err != nil {
+		return err
+	}
+	if parsed == nil {
+		return nil
+	}
+
+	s.catalogMu.Lock()
+	if s.catalogs == nil {
+		s.catalogs = make(map[string]*catalog.Catalog)
+	}
+	s.catalogs[origin] = parsed
+	s.catalogMu.Unlock()
+	log.Infof("Parsed catalog zone %s with %d member zones", origin, len(parsed.Members))
+	return nil
+}