[VOL-4289] Proto changes for gRPC migration
Change-Id: I317a0a865ccf78d0c37aa229c50d293a3f66c8bb
diff --git a/vendor/github.com/golang/protobuf/proto/discard.go b/vendor/github.com/golang/protobuf/proto/discard.go
new file mode 100644
index 0000000..2187e87
--- /dev/null
+++ b/vendor/github.com/golang/protobuf/proto/discard.go
@@ -0,0 +1,58 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package proto
+
+import (
+ "google.golang.org/protobuf/reflect/protoreflect"
+)
+
+// DiscardUnknown recursively discards all unknown fields from this message
+// and all embedded messages.
+//
+// When unmarshaling a message with unrecognized fields, the tags and values
+// of such fields are preserved in the Message. This allows a later call to
+// marshal to be able to produce a message that continues to have those
+// unrecognized fields. To avoid this, DiscardUnknown is used to
+// explicitly clear the unknown fields after unmarshaling.
+func DiscardUnknown(m Message) {
+ if m != nil {
+ discardUnknown(MessageReflect(m))
+ }
+}
+
+func discardUnknown(m protoreflect.Message) {
+ m.Range(func(fd protoreflect.FieldDescriptor, val protoreflect.Value) bool {
+ switch {
+ // Handle singular message.
+ case fd.Cardinality() != protoreflect.Repeated:
+ if fd.Message() != nil {
+ discardUnknown(m.Get(fd).Message())
+ }
+ // Handle list of messages.
+ case fd.IsList():
+ if fd.Message() != nil {
+ ls := m.Get(fd).List()
+ for i := 0; i < ls.Len(); i++ {
+ discardUnknown(ls.Get(i).Message())
+ }
+ }
+ // Handle map of messages.
+ case fd.IsMap():
+ if fd.MapValue().Message() != nil {
+ ms := m.Get(fd).Map()
+ ms.Range(func(_ protoreflect.MapKey, v protoreflect.Value) bool {
+ discardUnknown(v.Message())
+ return true
+ })
+ }
+ }
+ return true
+ })
+
+ // Discard unknown fields.
+ if len(m.GetUnknown()) > 0 {
+ m.SetUnknown(nil)
+ }
+}