third_party/grpc/src/compiler/ruby_plugin.cc

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// Generates Ruby gRPC service interface out of Protobuf IDL.

#include <memory>

#include "src/compiler/config.h"
#include "src/compiler/ruby_generator.h"
#include "src/compiler/ruby_generator_helpers-inl.h"

class RubyGrpcGenerator : public grpc::protobuf::compiler::CodeGenerator {
 public:
  RubyGrpcGenerator() {}
  ~RubyGrpcGenerator() {}

  bool Generate(const grpc::protobuf::FileDescriptor *file,
                const grpc::string &parameter,
                grpc::protobuf::compiler::GeneratorContext *context,
                grpc::string *error) const {
    grpc::string code = grpc_ruby_generator::GetServices(file);
    if (code.size() == 0) {
      return true;  // don't generate a file if there are no services
    }

    // Get output file name.
    grpc::string file_name;
    if (!grpc_ruby_generator::ServicesFilename(file, &file_name)) {
      return false;
    }
    std::unique_ptr<grpc::protobuf::io::ZeroCopyOutputStream> output(
        context->Open(file_name));
    grpc::protobuf::io::CodedOutputStream coded_out(output.get());
    coded_out.WriteRaw(code.data(), code.size());
    return true;
  }
};

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