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CONTRIBUTING.md

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Contributing to ScalaPB

Thank you for your interest in contributing to ScalaPB!

Before spending considerable amount of work on a new feature or bug fix, please reach out through our mailing list, Gitter channel or Github to discuss the problem you want to solve and how you want to solve it. Please indicate if you are able to spend time working on a PR - we will be happy to give guidance.

Project Structure

  • compiler-plugin: this is where the code generator (transforms protos into Scala source code) lives.
  • scalapb-runtime: this is a Scala library that the generated code depends on. It provides the base classes and traits that the generated code extends as well as base common function it calls. This library is cross-built for JVM, Scala.js and Native.
  • scalapb-runtime-grpc: this is the Scala library that generated gRPC services depend on.
  • lenses: a little lenses library that the generated code depends on.
  • proptest: a test suite that generates random protocol buffers, fake date for them and tries to get it all to compile and pass property-based testing.
  • e2e: a test suite that exercises all the functionality of ScalaPB end-to-end.
  • e2e-withjava: like e2e but also have java_conversions enabled.
  • e2e-grpc: e2e test that includes generated services
  • protobuf/scalapb/scalapb.proto: the place where ScalaPB options are defined.
  • scalapbc: a CLI and a library that can used invoke ScalaPB without SBT.

Running the e2e (end-to-end) tests

We assume that you have a JVM and SBT installed.

The end-to-end tests contain main test protobufs under e2e/src/main/protobuf and runtime tests at e2e/src/test/scala.

Our sbt build uses sbt-projectmatrix which creates a synthetic project for each Scala version and platform (JVM/Native/JS). Type projects in sbt to see available projects. To run the test for a specific project:

e2eJVM2_12/test
e2eJS2_13/test

Modifying scalapb.proto

Some features would require adding a new option in scalapb.proto. After each time that you edit scalapb.proto, you need to run ./make_plugin_protos.sh. This script generates code out of scalapb.proto for both the compiler plugin and the runtime library. Currently, this generated code gets checked in, so it will become part of your PR.

Accessors to the option should be defined in the appropriate section in DescriptorImplicits.scala and typically used in ProtobufGenerator.scala

If there are any validation rules of when this option can be applied, it should be validated in ProtoValidation.scala and tested in ProtoValidationSpec.scala.

Finally, a test proto and spec should be added to e2e.

Wrapping up your PR

  • Run mima.sh to list all binary incompatibilities you may have introduced while working on this. Add the exclusions to build.sbt. Binary incompatibilities are expected when modifying scalapb.proto and in the meantime we have some tolerance for certain type of incompatabilities.
  • In SBT, run scalafmtAll to ensure the code compiles cleanly.
  • Run ./make_plugin_proto.sh to re-generate all the generated code that ships with ScalaPB.
  • Update the documentation (see docs/README.md) and CHANGELOG.md