The issue is that when you access the descriptor that way, it does not know
about the custom options.
You need to create an ExtensionRegistry. You'll also need the Java code
produced from the annotations.proto file: that generated code will have a
way to access the extensions (to add them to your registry), and IIRC even
includes a way to register all extensions in the file.
Then you'll have to re-parse the descriptor proto with the
ExtensionRegistry -- that way, the field will be recognized and parsed
correctly instead of considered an unknown field. IIRC (I've been doing Go
for a while, so my recollection of the Java protobuf runtime might be
fading a little), to re-parse them you have to serialize it to bytes (in
this case, the method descriptor proto) and then de-serialize again. The
resulting de-serialized message will now have the options in a queryable
form.
----
*Josh Humphries*
jh...@bluegosling.com
On Fri, Jul 20, 2018 at 8:30 PM Ankit Patel <ankit.patel...@gmail.com>
wrote:
> Hi All,
>
> I have a simple .proto file
>
> syntax = "proto3";
>
> package helloworld.v1;
>
> option java_package = "helloworld.v1";
> option java_multiple_files = true;
>
> import "google/api/annotations.proto";
>
> service HelloWorldService {
> rpc sayHello (SayHelloRequest) returns (SayHelloResponse) {
> option (google.api.http) = {
> post: "/v1/example/echo"
> body: "*"
> };
> }
> }
>
> message SayHelloRequest {
> string favourite_thing = 1;
> }
>
> message SayHelloResponse {
> string reply = 1;
> }
>
> I am generating a proto descriptor set from it using the proto compiler.
>
> After that I am trying to read the proto descriptor programatically in the
> java code like this
> FileDescriptorSet Hello = FileDescriptorSet.parseFrom(new
> FileInputStream(new File("D:\\temp\\descriptor\\Hello.pb")));
> FileDescriptorSet Annotations = FileDescriptorSet.parseFrom(new
> FileInputStream(new File("D:\\temp\\descriptor\\annotations.pb")));
> FileDescriptorSet Http = FileDescriptorSet.parseFrom(new
> FileInputStream(new File("D:\\temp\\descriptor\\http.pb")));
> FileDescriptorSet Descriptor = FileDescriptorSet.parseFrom(new
> FileInputStream(new File("D:\\temp\\descriptor\\descriptor.pb")));
>
> FileDescriptor httpD = FileDescriptor.buildFrom(Http.getFile(0), new
> FileDescriptor[] {}, true);
> FileDescriptor descriptorD =
> FileDescriptor.buildFrom(Descriptor.getFile(0), new FileDescriptor[] {},
> true);
> FileDescriptor annotationsD =
> FileDescriptor.buildFrom(Annotations.getFile(0), new FileDescriptor[]
> {httpD, descriptorD});
>
> ExtensionRegistry registry = ExtensionRegistry.newInstance();
> FieldDescriptor httpFD = annotationsD.findExtensionByName("http");
> Message httpRuleM =
> DynamicMessage.newBuilder(httpD.findMessageTypeByName("HttpRule")).build();
> registry.add(httpFD, httpRuleM);
>
> FileDescriptor helloD = FileDescriptor.buildFrom(Hello.getFile(0), new
> FileDescriptor[] {annotationsD});
> FileDescriptor.internalUpdateFileDescriptor(helloD, registry);
>
> helloD.findServiceByName("HelloWorldService").findMethodByName("sayHello").getOptions();
>
> The api call in the last line puts the "http" in the unknown field, and
> the reason is because its a custom option and not registered. But as you
> can see I am doing that.
>
> Can someone please guide me on what am I doing wrong?
>
> Thanks!
>
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