src/messages/messages.hpp

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __MESSAGES_HPP__
#define __MESSAGES_HPP__

#include <google/protobuf/message.h>

#include <google/protobuf/io/zero_copy_stream_impl.h> // For ArrayInputStream.

#include <ostream>
#include <string>

#include <stout/error.hpp>
#include <stout/try.hpp>

#include "messages/messages.pb.h"

namespace messages {

template <typename T>
Try<T> deserialize(const std::string& value)
{
  T t;
  (void) static_cast<google::protobuf::Message*>(&t);

  google::protobuf::io::ArrayInputStream stream(value.data(), value.size());
  if (!t.ParseFromZeroCopyStream(&stream)) {
    return Error("Failed to deserialize " + t.GetDescriptor()->full_name());
  }
  return t;
}


template <typename T>
Try<std::string> serialize(const T& t)
{
  (void) static_cast<const google::protobuf::Message*>(&t);

  std::string value;
  if (!t.SerializeToString(&value)) {
    return Error("Failed to serialize " + t.GetDescriptor()->full_name());
  }
  return value;
}

} // namespace messages {


// Definitions for operators on protobuf classes that don't have these
// operators generated by the protobuf compiler.

namespace mesos {
namespace internal {

bool operator==(const Task& left, const Task& right);


std::ostream& operator<<(
    std::ostream& stream,
    const StatusUpdate& update);

inline std::ostream& operator<<(
    std::ostream& stream,
    const StatusUpdateRecord::Type& type)
{
  return stream
    << StatusUpdateRecord::Type_descriptor()->FindValueByNumber(type)->name();
}

} // namespace internal {
} // namespace mesos {

#endif // __MESSAGES_HPP__