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posts-go/posts/2022-07-19-migrate-to-buf.md

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Migrate to buf from prototool

Why? Because prototool is outdated, and can not run on M1 mac.

We need 3 files:

  • build.go: need to install protoc-gen-* binaries with pin version in go.mod
  • buf.yaml
  • buf.gen.yaml

FYI, the libs version I use:

build.go:

//go:build tools
// +build tools

import (
  _ "github.com/envoyproxy/protoc-gen-validate"
  _ "github.com/golang/protobuf/protoc-gen-go"
  _ "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway"
  _ "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger"
  _ "github.com/kei2100/protoc-gen-marshal-zap/plugin/protoc-gen-marshal-zap"
)

buf.yaml

version: v1
deps:
  - buf.build/haunt98/googleapis:b38d93f7ade94a698adff9576474ae7c
  - buf.build/haunt98/grpc-gateway:ecf4f0f58aa8496f8a76ed303c6e06c7
  - buf.build/haunt98/protoc-gen-validate:2686264610fc4ad4a9fcc932647e279d
  - buf.build/haunt98/marshal-zap:2a593ca925134680a5820d3f13c1be5a
breaking:
  use:
    - FILE
lint:
  use:
    - DEFAULT

buf.gen.yaml:

version: v1
plugins:
  - name: go
    out: pkg
    opt:
      - plugins=grpc
  - name: grpc-gateway
    out: pkg
    opt:
      - logtostderr=true
  - name: swagger
    out: .
    opt:
      - logtostderr=true
  - name: validate
    out: pkg
    opt:
      - lang=go
  - name: marshal-zap
    out: pkg

Update Makefile:

gen:
  go install github.com/golang/protobuf/protoc-gen-go
  go install github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
  go install github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
  go install github.com/envoyproxy/protoc-gen-validate
  go install github.com/kei2100/protoc-gen-marshal-zap/plugin/protoc-gen-marshal-zap
  go install github.com/bufbuild/buf/cmd/buf@latest
  buf mod update
  buf format -w
  buf generate

Run make gen to have fun of course.

FAQ

Remember grpc-ecosystem/grpc-gateway, envoyproxy/protoc-gen-validate, kei2100/protoc-gen-marshal-zap is optional, so feel free to delete if you don't use theme.

If use vendor:

  • Replace buf generate with buf generate --exclude-path vendor.
  • Replace buf format -w with buf format -w --exclude-path vendor.

If you use grpc-gateway:

  • Replace import "third_party/googleapis/google/api/annotations.proto"; with import "google/api/annotations.proto";
  • Delete security_definitions, security, in option (grpc.gateway.protoc_gen_swagger.options.openapiv2_swagger).

The last step is delete prototool.yaml.

If you are not migrate but start from scratch:

  • Add buf lint to make sure your proto is good.
  • Add buf breaking --against "https://your-grpc-repo-goes-here.git" to make sure each time you update proto, you don't break backward compatibility.

Thanks