Crash on annotations.proto

[santhanamk]

I have this annotations.proto file:

// Copyright (c) 2015, Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

import "google/http.proto";
import "google/protobuf/descriptor.proto";
// ...

extend .google.protobuf.MethodOptions {
    HttpRule http = 72295728;
}

But when it gets processed by the Wire Gradle plugin (via Android Studio) I get this crash:

Cause: extensions are not allowed in proto3
for extend google.protobuf.MethodOptions (...app/src/main/proto/google/annotations.proto:28:1)

Is there a workaround or solution for this?

[oldergod]

As the error specifies, you cannot define extensions in proto3 files. Change the syntax or don't use an extension?

[santhanamk]

Ok thanks for your reply! Why is it that other libraries like KrotoDC or even the protoc-gen/protobuf libraries for Java/Kotlin are able to process this file without crashing?

Is the Wire Compiler more strict?

Also, what would be an alternate syntax that I could use?

[oldergod]

Thank you. It looks like we missed that when adding proto3 support. Extensions are allowed for defining options, even in proto3 files. I can fix that at some point but your best move right now would be to move this extension definition in a proto2 file.

[oldergod]

Actually @santhanamk you can get your build pass by removing the leading ..

- extend .google.protobuf.MethodOptions {
+ extend google.protobuf.MethodOptions {

[santhanamk]

@oldergod if I remove the .. I see this error:

I think it is due to the descriptor.proto import above.

For proto3 however, after I remove the . and do a Build in Android Studio wire is successful, and still generates all of the proto files. Do you think the HttpRule is getting ignored somehow?

If I downgrade to proto2 and move that extend into there then that does work as well.

Do you know by roughly when you could fix this bug? Thanks for your help.

[oldergod]

Any syntax error in the .proto file is only noise. You gotta run Wire to be sure that it works or not.

[oldergod]

The fix, I would not count on it before the summer. Might happen before.

[santhanamk]

ok thank you!