wren

Wren

Wren is the API layer between external client libraries, and Compute. It also manages table schema and metadata.

Building

Notes

• To manage dependences, wren uses go-modules.
  • The go.mod file is defined in the root wren folder.
• To generate gRPC/protobuf libraries, wren uses Buf
  • The buf.gen.yaml files are defined in the root proto folder

Building Wren

Note that building wren currently requires docker. Docker is used for generating code for gRPC via buf.

• make proto/generate
  • writes the output to gen/ -- all the files execpt those that match the pattern *.ent.go are dyamically generated. do not commit them to the repo.
• make ent/generate
  • writes the output to ent/ -- all the files except those in ent/schema/ and ent/generate.go are dyamically generated. do not commit them to the repo.
• make wren/build
  • generates the wren executable

Testing Wren

Generating Mocks

Adding

To add mocks for additional interfaces in wren, update the .mockery.yaml file and then run make wren/generate-mocks from the root folder of the monorepo.

Updating

To update the existing mocks for recent interface changes, run make wren/generate-mocks from the from the root folder of the monorepo.

Running Unit Tests

From the root of the monorepo, run make wren/test

Standards

The following standards are used in the design of the Wren API:

• For gRPC/protobuf:
  • Google API Design Guide
  • Protobuf Style Guide
• For REST:
  • OpenAPI Specification

Tools Used

• For protobuf linting / compiling / documentation: buf
• For the REST reverse-proxy & documentation: grpc-gateway
• For gRPC/protobuf documentation, one of the following (to be decided):
  • protoc-gen-template
  • protoc-gen-doc

Helpful Links/Repos

• Github googleapis/googleapis

• Github protocolbuffers/protobuf

• Awesome gRPC

• gRPC Website - Official documentation, libraries, resources, samples and FAQ

• gRPC Technical documentation - Collection of useful technical documentation

• gRPC status codes - Status codes and their use in gRPC

• gRPC status code mapping - HTTP to gRPC Status Code Mapping

• grpc-errors - Code examples in each language on how to return and handle error statuses. *Zerolog