grpc/src/compiler/go_plugin.cc

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// Generates go gRPC service interface out of Protobuf IDL.
//
// This is a Proto2 compiler plugin.  See net/proto2/compiler/proto/plugin.proto
// and net/proto2/compiler/public/plugin.h for more information on plugins.

#include <fstream>
#include <memory>

using namespace std;

#include "src/compiler/go_generator.h"
#include <google/protobuf/compiler/code_generator.h>
#include <google/protobuf/compiler/plugin.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/descriptor.h>

class GoGrpcGenerator : public google::protobuf::compiler::CodeGenerator {
 public:
  GoGrpcGenerator() {}
  virtual ~GoGrpcGenerator() {}

  virtual bool Generate(const google::protobuf::FileDescriptor* file,
                        const string& parameter,
                        google::protobuf::compiler::GeneratorContext* context,
                        string* error) const {
    // Get output file name.
    string file_name;
    if (file->name().size() > 6 &&
        file->name().find_last_of(".proto") == file->name().size() - 1) {
      file_name =
          file->name().substr(0, file->name().size() - 6) + "_grpc.pb.go";
    } else {
      *error = "Invalid proto file name. Proto file must end with .proto";
      return false;
    }

    std::unique_ptr<google::protobuf::io::ZeroCopyOutputStream> output(
        context->Open(file_name));
    google::protobuf::io::CodedOutputStream coded_out(output.get());
    string code = grpc_go_generator::GetServices(file);
    coded_out.WriteRaw(code.data(), code.size());
    return true;
  }
};

int main(int argc, char* argv[]) {
  GoGrpcGenerator generator;
  return google::protobuf::compiler::PluginMain(argc, argv, &generator);
}