Created
October 9, 2023 06:23
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Example cleanup function for protobuf message
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func clearProtoFields(msg proto.Message, sensitiveFieldAnnotation *protoimpl.ExtensionInfo) proto.Message { | |
clonedMsg := proto.Clone(msg) | |
reflectMsg := proto.MessageReflect(clonedMsg) | |
var messagesToCheck []protoreflect.Message | |
messagesToCheck = append(messagesToCheck, reflectMsg) | |
for len(messagesToCheck) != 0 { | |
lastIdx := len(messagesToCheck) - 1 | |
visitMessage := messagesToCheck[lastIdx] | |
messagesToCheck = messagesToCheck[:lastIdx] | |
visitMessage.Range(func(fd protoreflect.FieldDescriptor, val protoreflect.Value) bool { | |
if opts := fd.Options().(*descriptorpb.FieldOptions); opts != nil { | |
if proto.HasExtension(opts, sensitiveFieldAnnotation) { | |
visitMessage.Clear(fd) | |
} | |
return true | |
} | |
switch { | |
case fd.Kind() != protoreflect.MessageKind: | |
return true | |
case fd.IsList(): | |
listVal := val.List() | |
for i := 0; i < listVal.Len(); i++ { | |
elem := listVal.Get(i) | |
messagesToCheck = append(messagesToCheck, elem.Message()) | |
} | |
case fd.IsMap(): | |
mapVal := val.Map() | |
mapVal.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool { | |
messagesToCheck = append(messagesToCheck, v.Message()) | |
return true | |
}) | |
default: | |
messagesToCheck = append(messagesToCheck, val.Message()) | |
} | |
return true | |
}) | |
} | |
return clonedMsg | |
} |
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