Add deprecated warnings

experimental/libbox/deprecated.go

@@ -0,0 +1,56 @@
+package libbox
+
+import (
+	"sync"
+
+	"github.com/sagernet/sing-box/experimental/deprecated"
+)
+
+var _ deprecated.Manager = (*deprecatedManager)(nil)
+
+type deprecatedManager struct {
+	access   sync.Mutex
+	features []deprecated.Note
+}
+
+func (m *deprecatedManager) ReportDeprecated(feature deprecated.Note) {
+	m.access.Lock()
+	defer m.access.Unlock()
+	m.features = append(m.features, feature)
+}
+
+func (m *deprecatedManager) Get() []deprecated.Note {
+	m.access.Lock()
+	defer m.access.Unlock()
+	features := m.features
+	m.features = nil
+	return features
+}
+
+var _ = deprecated.Note(DeprecatedNote{})
+
+type DeprecatedNote struct {
+	Name              string
+	Description       string
+	DeprecatedVersion string
+	ScheduledVersion  string
+	EnvName           string
+	MigrationLink     string
+}
+
+func (n DeprecatedNote) Impending() bool {
+	return deprecated.Note(n).Impending()
+}
+
+func (n DeprecatedNote) Message() string {
+	return deprecated.Note(n).Message()
+}
+
+func (n DeprecatedNote) MessageWithLink() string {
+	return deprecated.Note(n).MessageWithLink()
+}
+
+type DeprecatedNoteIterator interface {
+	HasNext() bool
+	Next() *DeprecatedNote
+}