Switch to slog, remove logrus (#1672)

overlay/overlaytest/noop.go

@@ -0,0 +1,52 @@
+// Package overlaytest provides fakes of overlay.Device for tests that do
+// not want to touch a real tun device or route table.
+package overlaytest
+
+import (
+	"errors"
+	"io"
+	"net/netip"
+
+	"github.com/slackhq/nebula/routing"
+)
+
+// NoopTun is an overlay.Device that silently discards every read and write.
+// Useful in tests that need to construct a nebula Interface but do not
+// exercise the datapath.
+type NoopTun struct{}
+
+func (NoopTun) RoutesFor(addr netip.Addr) routing.Gateways {
+	return routing.Gateways{}
+}
+
+func (NoopTun) Activate() error {
+	return nil
+}
+
+func (NoopTun) Networks() []netip.Prefix {
+	return []netip.Prefix{}
+}
+
+func (NoopTun) Name() string {
+	return "noop"
+}
+
+func (NoopTun) Read([]byte) (int, error) {
+	return 0, nil
+}
+
+func (NoopTun) Write([]byte) (int, error) {
+	return 0, nil
+}
+
+func (NoopTun) SupportsMultiqueue() bool {
+	return false
+}
+
+func (NoopTun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
+	return nil, errors.New("unsupported")
+}
+
+func (NoopTun) Close() error {
+	return nil
+}