The proto package has methods for accessing extensions. And the generated
.pb.go file contains exported symbols that describe those extensions. Put
them together, and you can get the custom options out -- something like so:
opts := md.Field[0].GetOptions()
foo, err := proto.GetExtension(opts, E_FooOptions)
if err != nil {
fmt.Println(foo.GetOpt1()) // 123
fmt.Println(foo.GetOpt2()) // baz
}
opts = md.Field[1].GetOptions()
foo, err = proto.GetExtension(opts, E_FooOptions)
if err != nil {
fmt.Println(foo.GetOpt1()) // 456
fmt.Println(foo.GetOpt2()) // xaa
}
----
*Josh Humphries*
[email protected]
On Wed, Oct 25, 2017 at 8:38 AM, <[email protected]> wrote:
> the example in https://developers.google.com/protocol-buffers/docs/
> proto#customoptions below
>
> message FooOptions {
> optional int32 opt1 = 1;
> optional string opt2 = 2;
> }
>
> extend google.protobuf.FieldOptions {
> optional FooOptions foo_options = 1234;
> }
>
> // usage:
> message Bar {
> optional int32 a = 1 [(foo_options).opt1 = 123, (foo_options).opt2 = "baz"];
> // alternative aggregate syntax (uses TextFormat):
> optional int32 b = 2 [(foo_options) = { opt1: 456 opt2: "xaa" }];
> }
>
> assume I have a message Bar here:
>
> var msg Bar
> _, md := ForMessage(&msg)
> md.Field[0].GetOptions().String() only a string, How do i parse that ??
>
> How to I get the exact value of Bar.b.opt1 which is 123 (default value)
>
> What I want is like this
>
> md.Field[0].GetOptions().GetOpt1() // 123
> md.Field[0].GetOptions().GetOpt2() // baz
> md.Field[1].GetOptions().GetOpt1() // 456
> md.Field[1].GetOptions().GetOpt2() // xaa
>
> Can we achieve that ?
>
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