Makefile

guard-%:
	@ if [ "${${*}}" = "" ]; then \
		echo "Environment variable $* not set"; \
		exit 1; \
	fi

KERNEL := linux

ifeq ($(shell uname -s), Darwin)
	KERNEL := osx
endif

.PHONY: clean
clean:
	rm -rf ./tools

protoc-%:
	$(eval VERSION := $*)
	rm -rf tools/$(VERSION) || true
	mkdir -p tools/$(VERSION)
	wget https://github.com/protocolbuffers/protobuf/releases/download/v$(VERSION)/protoc-$(VERSION)-$(KERNEL)-$(shell uname -m).zip -qO tools/protoc.zip
	unzip -q tools/protoc.zip -d tools/$(VERSION)

.PHONY: protos
protos: guard-PROTOC_VERSION guard-PROTOC_GEN_GO_VERSION
	echo "> BUILD protoc@v$(PROTOC_VERSION) protoc-gen-go@v$(PROTOC_GEN_GO_VERSION)"
	$(MAKE) protoc-$(PROTOC_VERSION)
	mkdir -p protos/sample
	cd /tmp && go get -u github.com/golang/protobuf/protoc-gen-go@v$(PROTOC_GEN_GO_VERSION) && cd -
	tools/$(PROTOC_VERSION)/bin/protoc -I ./protos --go_out=plugins=grpc:./protos/sample sample.proto

.PHONY: test
test:
	go test -race -coverprofile=covprofile.out -test.v .

.PHONY: test-all
test-all: clean
	PROTOC_VERSION=3.5.1 PROTOC_GEN_GO_VERSION=1.2.0 $(MAKE) protos test
	PROTOC_VERSION=3.5.1 PROTOC_GEN_GO_VERSION=1.4.2 $(MAKE) protos test
	PROTOC_VERSION=3.12.4 PROTOC_GEN_GO_VERSION=1.4.2 $(MAKE) protos test