Transition to use golang/protobuf to support automated code generation

Makefile

@@ -10,37 +10,26 @@ PKG 		:= github.com/envoyproxy/go-control-plane
 
 .PHONY: build
 build:
-	@echo "--> building"
 	@go build ./pkg/... ./envoy/...
 
-.PHONY: clean
-clean:
-	@echo "--> cleaning compiled objects and binaries"
-	@go clean -tags netgo -i ./...
-	@rm -rf $(BINDIR)/*
-
 .PHONY: test
 test:
-	@echo "--> running unit tests"
 	@go test ./pkg/...
 
 .PHONY: cover
 cover:
-	@echo "--> running coverage tests"
 	@build/coverage.sh
 
 .PHONY: format
 format:
-	@echo "--> formatting code with 'goimports' tool"
-	@goimports -local $(PKG) -w -l pkg envoy
+	@goimports -local $(PKG) -w -l pkg
 
 #-----------------
 #-- integration
 #-----------------
 .PHONY: $(BINDIR)/test integration integration.ads integration.xds integration.rest integration.ads.tls
 
 $(BINDIR)/test:
-	@echo "--> building test binary"
 	@go build -race -o $@ pkg/test/main/main.go
 
 integration: integration.xds integration.ads integration.rest integration.ads.tls
@@ -56,24 +45,3 @@ integration.rest: $(BINDIR)/test
 
 integration.ads.tls: $(BINDIR)/test
 	env XDS=ads build/integration.sh -tls
-
-#-----------------
-#-- code generaion
-#-----------------
-
-generate:
-	@echo "--> vendoring protobufs"
-	@go mod vendor
-	@echo "--> generating pb.go files"
-	$(SHELL) build/generate_protos.sh
-
-$(BINDIR):
-	@mkdir -p $(BINDIR)
-
-.PHONY: generate-patch
-generate-patch:
-	@echo "--> patching generated code due to issue with protoc-gen-validate"
-	find envoy -type f -print0 |\
-		xargs -0 sed -i 's#"envoy/api/v2/core"#"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"#g'
-	find envoy -type f -print0 |\
-		xargs -0 sed -i 's#"envoy/api/v2"#"github.com/envoyproxy/go-control-plane/envoy/api/v2"#g'

README.md

@@ -4,11 +4,11 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/envoyproxy/go-control-plane)](https://goreportcard.com/report/github.com/envoyproxy/go-control-plane)
 [![GoDoc](https://godoc.org/github.com/envoyproxy/go-control-plane?status.svg)](https://godoc.org/github.com/envoyproxy/go-control-plane)
 
-
 This repository contains a Go-based implementation of an API server that
 implements the discovery service APIs defined in
 [data-plane-api](https://github.com/envoyproxy/data-plane-api).
 
+
 ## Scope
 
 Due to the variety of platforms out there, there is no single
@@ -52,31 +52,6 @@ in the same environment as the circle ci. This makes sure to produce a consisten
     ./build/run_docker.sh make build test
     ```
 
-1. Generate proto files (if you update the [data-plane-api](https://github.com/envoyproxy/data-plane-api)
-dependency)
-
-    ```sh
-    ./build/run_docker.sh make generate
-    ```
-
-    __NOTE__: you may need to apply a small patch to correct imports in the generate files:
-
-    ```sh
-    ./build/run_docker.sh make generate-patch
-    ```
-
-    Format the code:
-
-    ```sh
-    ./build/run_docker.sh make format
-    ```
-
-    Run build and unit tests again:
-
-    ```sh
-    ./build/run_docker.sh make build test
-    ```
-
 1. Run [integration test](pkg/test/main/README.md) against the latest Envoy binary:
 
     ```sh