ddnnss

Signed-off-by: Mel <mel@rnrd.eu>

1 files changed, 44 insertions, 0 deletions

diff --git a/source/static.go b/source/static.go
new file mode 100644
index 0000000..d2645d6
--- /dev/null
+++ b/source/static.go
@@ -0,0 +1,44 @@
+package source
+
+import (
+	"fmt"
+	"log/slog"
+	"net/netip"
+)
+
+// a simple source that returns the configured address.
+// useful when a record needs to have one specific value,
+// that is known in advance, and for debugging.
+type staticSource struct {
+	log  *slog.Logger
+	addr netip.Addr
+}
+
+var _ Source = (*staticSource)(nil)
+
+func newStatic(log *slog.Logger, cfg Config) (*staticSource, error) {
+	log = log.With("source", "static")
+	addr, err := parse(cfg.Value, cfg.Family)
+	if err != nil {
+		log.Error(
+			"static source can't be created from value",
+			slog.String("family", string(cfg.Family)),
+			slog.String("value", cfg.Value),
+		)
+		return nil, fmt.Errorf("can't create static source from value: %w", err)
+	}
+
+	return &staticSource{log: log, addr: addr}, nil
+}
+
+func (s *staticSource) Supports(f Family) bool {
+	return (s.addr.Is4() && f == IPv4) || (s.addr.Is6() && f == IPv6)
+}
+
+func (s *staticSource) Lookup(Family) (netip.Addr, error) {
+	s.log.Info(
+		"looked up address from static source",
+		slog.String("addr", s.addr.String()),
+	)
+	return s.addr, nil
+}