dongtiaobeng7901
2018-12-21 19:31
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如何访问proto.EnumValueOptions扩展值

I have similar setup as bellow, how can I access my extension values from XYZ enum using "github.com/golang/protobuf/proto"?

  extend google.protobuf.EnumValueOptions {
    Details meta = 50001;
  }

  message Details {
    string description = 1;
  }

  enum MyEnum {
    MY_ENUM_UNSPECIFIED = 0;
    XYZ = 1 [deprecated=true, (meta) = {description: "lorem ipsum"}];
  }

I'm aware of proto.GetExtension(proto.Message, proto.ExtensionDesc), however I'm cannot figure out how it can be used for the enum...

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我的设置与下面类似,如何从 XYZ 枚举访问扩展名值 使用“ github.com/golang/protobuf/proto”?

 扩展google.protobuf.EnumValueOptions {
 Details meta = 50001; 
} 
 
 message Details  {
字符串描述= 1; 
} 
 
枚举MyEnum {
 MY_ENUM_UNSPECIFIED = 0; 
 XYZ = 1 [不推荐使用= true,(元)= {描述:“ lorem ipsum”}]]; 
  } 
   
 
 

我知道 proto.GetExtension(proto.Message,proto.ExtensionDesc),但是我不知道 如何将其用于枚举...

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  • dougupang0901 2019-01-11 14:28
    已采纳

    Bit late but I've just run into the same; you can do it like this:

    fd, _ := descriptor.ForMessage(&pb.Details{})
    for _, e := range fd.EnumType {
        if e.GetName() == "MyEnum" {
            for _, v := range e.Value {
                ext, err := proto.GetExtension(v.Options, pb.E_Meta)
                if err == nil {
                    details := ext.(*pb.Details)
                    // do stuff with details
                }
            }
        }
    }
    

    There might be a more direct way of getting the enum descriptor, although I haven't managed after a bit of wrangling.

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