merlimat opened a new pull request, #25407:
URL: https://github.com/apache/pulsar/pull/25407
## Summary
Migrate the `pulsar-functions/proto` module from standard Google protobuf to
LightProto, continuing the effort to remove protobuf-java dependency from
Pulsar internals.
- Replace protobuf Gradle plugin with lightproto plugin in `build.gradle.kts`
- Replace `google.protobuf.Empty` with local `Empty` message for gRPC
compatibility (identical wire format)
- Bump LightProto to 0.6.6 (adds `parseFromJson()`/`toJson()` support,
replacing `JsonFormat`)
- Remove `protobuf-java-util` from `runtime-all` (no longer needed since
`JsonFormat` is replaced by native LightProto JSON)
- Adapt all Java sources across `instance`, `runtime`, `worker`, `utils`,
`secrets`, and `localrunner` modules to use LightProto API:
- Mutable objects instead of Builder pattern
- Indexed iteration for repeated fields
- `isX()` boolean getters, `getValue()` for enums
- `copyFrom()` instead of `toBuilder()`
- `parseFromJson()`/`toJson()` instead of `JsonFormat`
- `StreamObserver`-based async gRPC instead of `FutureStub`
### Documentation
- [x] `doc-not-needed`
### Matching PR in forked repository
_No response_
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