fix: use tools package correctly to capture the versions

Author: kkweon

.gitignore

@@ -15,3 +15,4 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
+.idea/

Makefile

@@ -20,11 +20,10 @@ ifeq ($(UNAME), Linux)
 	export PATH="$${PATH}:$${HOME}/.local/bin"
 endif
 endif
-#ifeq ($(PROTOC_GEN_GO),)
-#	(go mod download && grep _ ./cmd/tools.go | cut -d' ' -f2 | xargs go install)
-	(go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest && go install google.golang.org/protobuf/cmd/protoc-gen-go@latest)
-#endif
-	
+ifeq ($(PROTOC_GEN_GO),)
+	go mod download && grep _ ./cmd/tools/tools.go | cut -d' ' -f2 | xargs go install -v
+endif
+
 all:
 	mkdir -p ./pkg/pbs/
 	protoc \
@@ -34,6 +33,6 @@ all:
     --go-grpc_out=. \
     --go-grpc_opt=paths=source_relative \
     $(PROTO_FILES)
-    
+
 clean:
-	rm -rf ./pkg/pbs/*.pb.go    
+	rm -rf ./pkg/pbs/*.pb.go

cmd/tools.go

@@ -0,0 +1,17 @@
+// +build tools
+
+// tools is a special package to capture the following packages into `go.mod`.
+//
+// These tools are used to generate Go files from Protocol Buffers.
+// But, these tools are not used directly in the code.
+// That's why we're capturing the packages in this file.
+//
+// Then, the following command will always install the same versions defined in `go.mod`.
+//
+//   go install google.golang.org/grpc/cmd/protoc-gen-go-grpc google.golang.org/protobuf/cmd/protoc-gen-go
+package tools
+
+import (
+	_ "google.golang.org/grpc/cmd/protoc-gen-go-grpc"
+	_ "google.golang.org/protobuf/cmd/protoc-gen-go"
+)

cmd/tools/tools.go

@@ -4,5 +4,6 @@ go 1.16
 
 require (
 	google.golang.org/grpc v1.38.0
+	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
 	google.golang.org/protobuf v1.26.0
 )

go.mod

@@ -70,6 +70,8 @@ google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQ
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.38.0 h1:/9BgsAsa5nWe26HqOlvlgJnqBuktYOLCgjCPqsa56W0=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0 h1:M1YKkFIboKNieVO5DLUEVzQfGwJD30Nv2jfUgzb5UcE=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=