grpc/src/compiler/ruby_plugin.cc

/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

// Generates Ruby 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 <memory>
#include <string>

#include "src/compiler/ruby_generator.h"
#include "src/compiler/ruby_generator_helpers-inl.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 RubyGrpcGenerator : public google::protobuf::compiler::CodeGenerator {
 public:
  RubyGrpcGenerator() {}
  ~RubyGrpcGenerator() override {}

  bool Generate(const google::protobuf::FileDescriptor *file,
                const std::string &parameter,
                google::protobuf::compiler::GeneratorContext *context,
                std::string *error) const override {
    std::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.
    std::string file_name;
    if (!grpc_ruby_generator::ServicesFilename(file, &file_name)) {
      return false;
    }
    std::unique_ptr<google::protobuf::io::ZeroCopyOutputStream> output(
        context->Open(file_name));
    google::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 google::protobuf::compiler::PluginMain(argc, argv, &generator);
}