[gRPC] Generate .pb.go from .proto

Generate .pb.go automatically using .proto file in Windows

For example, let's assume that we have following .proto written

syntax = "proto3";
package v1.k8s;
option go_package = "./nodes";

service Nodes {
  rpc GetNodes(GetNodesRequest) returns (GetNodesResponse);
}

message NodeInfoMessage {
  string name = 1;
  string version = 2;
  string address = 3;
  string osImage = 4;
  string ready = 5;
}

message GetNodesRequest {}

message GetNodesResponse {
  repeated NodeInfoMessage nodes = 1;
}

In order for us to use this nodes.proto, we need to have nodes.pb.go file. We can achieve that by following instruction under Windows 10 environment:

I am assuming that you have your GOPATH and all PATH environment variables set correctly.

1. Install Protocol Buffers

1. Download your Protocol Buffers from https://github.com/protocolbuffers/protobuf/releases. Look for Windows binary, for example it looks like protoc-21.12-win64.zip.
2. Extract .zip and set PATH.

2. Install Plugins

We need some things like protoc-gen-* to generate grpc stuff

$ go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
$ go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest

3. Generate .pb.go

When you have set your go_package as following:

option go_package = "./nodes";

This will generate your nodes.pb.go file under ./nodes directory. To do this, execute following command in the same directory where your nodes.proto resides in:

protoc -I . --go_out=. nodes.proto

This will generate the .pb.go file for gRPC

4. Generate _grpc.pb.go

Just like .pb.go, following command will generate nodes_grpc.pb.go under ./nodes directory. To do this, execute following command in the same directory where your nodes.proto resides in:

protoc -I . --protoc-gen_go=. nodes.proto 

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