spencerc/rules_buf

Bazel rules for Buf.

rules_buf

Bazel rules for Buf. The rules work alongside the proto_library rule of rules_proto.

Status

This module is a beta, but we may make a few changes as we gather feedback from early adopters.

Setup

Include the following snippet in the Workspace file to setup rules_buf. Refer to release notes of a specific version for setup instructions.

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "rules_buf",
    sha256 = "523a4e06f0746661e092d083757263a249fedca535bd6dd819a8c50de074731a",
    strip_prefix = "rules_buf-0.1.1",
    urls = [
        "https://github.com/bufbuild/rules_buf/archive/refs/tags/v0.1.1.zip",
    ],
)

load("@rules_buf//buf:repositories.bzl", "rules_buf_dependencies", "rules_buf_toolchains")

rules_buf_dependencies()

rules_buf_toolchains(version = "v1.5.0")

# rules_proto
load("@rules_proto//proto:repositories.bzl", "rules_proto_dependencies", "rules_proto_toolchains")

rules_proto_dependencies()

rules_proto_toolchains()

Refer the docs or browse the examples on how to setup and use for various scenarios.

List of rules

• buf_dependencies
• buf_lint_test
• buf_breaking_test

Gazelle Extension

The repo also offers a Gazelle extension for generating the rules.

Please refer to the gazelle section in the docs.

Development

The repository follows the official recommendation on deploying bazel rules. All the rule definitions are in buf/internal.

Gazelle

Gazelle extension is in gazelle/buf. Before looking at the code it would be best to understand the architecture of gazelle. The file structure is loosely based on the go and proto extensions that are shipped with gazelle. They are also excellent to better understand the architecture.

The main entry point to the extension is via the NewLanguage function in gazelle/buf/buf.go. Gazelle mostly depends on Language interface. Apart from that one can also implement some optional interfaces.

We implement the following interfaces,

• Language: Required. Used for build/test rule generation and label resolutions for these rules.
• RepoImporter: Optional. Used to generate buf_dependencies rule from buf.yaml/buf.work.yaml.
• CrossResolver: Optional. Used to resolve dependencies across extensions/languages. We use it to resolve any proto files that are part of buf_dependencies rules.