application-services/tools/protobuf-gen

Protobuf Rust generator

You may ask yourself: why not use prost-build directly in build.rs scripts like everybody else does? Well, Reasons, as usual.

• prost-build includes big binaries (> 4MB for each architecture) that we would not be able to check into mozilla-central.
• protoc is not even a dependency to build mozilla-central, therefore we would not be able to check in a "lite" version of prost-build that doesn't contain those binaries.

So instead, we use prost-build separately and check-in the Rust artifacts it generates. And that also makes the build faster, whoo-hoo.