ResponseCallbackAttrGet.cc

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <Common/Compat.h>

#include "ResponseCallbackAttrGet.h"

#include <AsyncComm/CommBuf.h>

#include <Common/Error.h>

using namespace Hyperspace;
using namespace Hypertable;

int ResponseCallbackAttrGet::response(const std::vector<DynamicBufferPtr> &buffers) {
  CommHeader header;
  header.initialize_from_request_header(m_event->header);
  if (buffers.size() == 1 && buffers.front()) {
    StaticBuffer buffer(*buffers.front());
    CommBufPtr cbp(new CommBuf(header, 12, buffer));
    cbp->append_i32(Error::OK);
    cbp->append_i32(1);
    cbp->append_i32(buffer.size);
    return m_comm->send_response(m_event->addr, cbp);
  }

  size_t len = 0;
  for (const auto &pdb : buffers) {
    if (pdb)
      len += pdb->fill();
  }

  CommBufPtr cbp(new CommBuf(header, 8 + 4 * buffers.size() + len));
  cbp->append_i32(Error::OK);
  cbp->append_i32(buffers.size());
  for (const auto &pdb : buffers) {
    if (pdb)
      Serialization::encode_bytes32(cbp->get_data_ptr_address(), pdb->base, pdb->fill());
    else
      cbp->append_i32(0);
  }
  return m_comm->send_response(m_event->addr, cbp);
}