This is an implementation of a Protobuf schema registry. Right now, the implementation is fairly basic and focuses on the documentation aspects of a registry. It is used internally at Spotify to power our API documentation for gRPC services.

A test instance is hosted on Netlify at https://spotify-proto-registry.netlify.com/. Note that this instance only hosts documentation, and will not serve Type requests correctly, because Netlify only offers hosting of static HTML pages.

This repository builds a docker image that can be used to generate a Protobuf registry for any set of schemas.

For example, using Google Cloud Build, put this in your cloudbuild.yaml:

steps:
  - name: 'spotify/proto-registry-builder:<version>'
    envs:
      INPUT: 'schema.fds.pb' # path to a binary Protobuf file containing a FileDescriptorSet
      OUTPUT: 'registry' # path to a directory where a Dockerfile + data should be put
  - name: 'gcr.io/cloud-builders/docker'
    args: [ 'build', '-t', 'gcr.io/$PROJECT_ID/registry', 'registry' ]

Right now, the building process is a bit hacky. It assumes that there is a file in src/schema/schema.pb containing a FileDescriptorSet containing the schema to be browsed. You can generate that file by running this command on some arbitrary protobufs:

protoc --include_imports --include_source_info \
  -o path/to/src/schema/schema.pb \
  -I dir dir/**/*.proto

There is a file descriptor set used by the tests that is generated with the ./test/update-testdata script that you can use if you don't have protoc installed:

gunzip -k test/testdata.fds.pb.gz
cp test/testdata.fds.pb src/schema/schema.pb

After that, simply run the usual:

yarn
yarn start

The registry responds to resources at /<type name> only. This matches the API of the Any type. The idea is that the registry should respond with documentation when requested (e.g. when the request specifies Accept: text/html or similar) and with a Type otherwise.

This project adheres to the Open Code of Conduct. By participating, you are expected to honor this code.