Add stringMethodOptionsExtension
This helper function can be used on service methods to read options, which extend method options by a string. e.g. It is possible to read "Some string" for a custom `my_method_option.bar` message option extension. See: https://developers.google.com/protocol-buffers/docs/proto#customoptions on how to define a custom extension and referencing is by a fieldID. ``` service MyService { rpc MyMethod(RequestType) returns(ResponseType) { option (my_method_option.bar) = "Some string"; } } ``` If `my_method_option.bar` was defined for `fieldID: 50000` one can reference it using protoc-gen-template like: ``` {{- stringMethodOptionsExtension 50000 .method }} ```
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@ -127,6 +127,7 @@ var ProtoHelpersFuncMap = template.FuncMap{
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"trailingComment": trailingComment,
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"leadingDetachedComments": leadingDetachedComments,
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"stringFieldExtension": stringFieldExtension,
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"stringMethodOptionsExtension": stringMethodOptionsExtension,
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"boolFieldExtension": boolFieldExtension,
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"isFieldMap": isFieldMap,
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"fieldMapKeyType": fieldMapKeyType,
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@ -234,6 +235,46 @@ func leadingDetachedComments(i interface{}) []string {
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return loc.GetLeadingDetachedComments()
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}
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// stringMethodOptionsExtension extracts method options of a string type.
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// To define your own extensions see:
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// https://developers.google.com/protocol-buffers/docs/proto#customoptions
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// Typically the fieldID of private extensions should be in the range:
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// 50000-99999
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func stringMethodOptionsExtension(fieldID int32, f *descriptor.MethodDescriptorProto) string {
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if f == nil {
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return ""
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}
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if f.Options == nil {
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return ""
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}
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var extendedType *descriptor.MethodOptions
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var extensionType *string
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eds := proto.RegisteredExtensions(f.Options)
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if eds[fieldID] == nil {
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ed := &proto.ExtensionDesc{
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ExtendedType: extendedType,
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ExtensionType: extensionType,
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Field: fieldID,
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Tag: fmt.Sprintf("bytes,%d", fieldID),
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}
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proto.RegisterExtension(ed)
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eds = proto.RegisteredExtensions(f.Options)
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}
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ext, err := proto.GetExtension(f.Options, eds[fieldID])
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if err != nil {
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return ""
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}
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str, ok := ext.(*string)
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if !ok {
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return ""
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}
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return *str
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}
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func stringFieldExtension(fieldID int32, f *descriptor.FieldDescriptorProto) string {
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if f == nil {
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return ""
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