aria2/src/UTMetadataRequestExtensionMessage.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2009 Tatsuhiro Tsujikawa
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "UTMetadataRequestExtensionMessage.h"
#include "bencode2.h"
#include "util.h"
#include "a2functional.h"
#include "bittorrent_helper.h"
#include "DlAbortEx.h"
#include "fmt.h"
#include "BtMessageFactory.h"
#include "BtMessageDispatcher.h"
#include "Peer.h"
#include "UTMetadataRejectExtensionMessage.h"
#include "UTMetadataDataExtensionMessage.h"
#include "BtConstants.h"
#include "DownloadContext.h"
#include "BtMessage.h"
#include "PieceStorage.h"
#include "ExtensionMessageRegistry.h"
#include "BtExtendedMessage.h"

namespace aria2 {

UTMetadataRequestExtensionMessage::UTMetadataRequestExtensionMessage(
    uint8_t extensionMessageID)
    : UTMetadataExtensionMessage{extensionMessageID},
      dctx_{nullptr},
      dispatcher_{nullptr},
      messageFactory_{nullptr}
{
}

std::string UTMetadataRequestExtensionMessage::getPayload()
{
  Dict dict;
  dict.put("msg_type", Integer::g(0));
  dict.put("piece", Integer::g(getIndex()));
  return bencode2::encode(&dict);
}

std::string UTMetadataRequestExtensionMessage::toString() const
{
  return fmt("ut_metadata request piece=%lu",
             static_cast<unsigned long>(getIndex()));
}

void UTMetadataRequestExtensionMessage::doReceivedAction()
{
  auto attrs = bittorrent::getTorrentAttrs(dctx_);
  uint8_t id =
      peer_->getExtensionMessageID(ExtensionMessageRegistry::UT_METADATA);
  if (attrs->metadata.empty()) {
    auto m = make_unique<UTMetadataRejectExtensionMessage>(id);
    m->setIndex(getIndex());
    dispatcher_->addMessageToQueue(
        messageFactory_->createBtExtendedMessage(std::move(m)));
  }
  else if (getIndex() * METADATA_PIECE_SIZE < attrs->metadataSize) {
    auto m = make_unique<UTMetadataDataExtensionMessage>(id);
    m->setIndex(getIndex());
    m->setTotalSize(attrs->metadataSize);
    auto begin = std::begin(attrs->metadata) + getIndex() * METADATA_PIECE_SIZE;
    auto end = (getIndex() + 1) * METADATA_PIECE_SIZE <= attrs->metadata.size()
                   ? std::begin(attrs->metadata) +
                         (getIndex() + 1) * METADATA_PIECE_SIZE
                   : std::end(attrs->metadata);
    m->setData(begin, end);
    dispatcher_->addMessageToQueue(
        messageFactory_->createBtExtendedMessage(std::move(m)));
  }
  else {
    throw DL_ABORT_EX(fmt("Metadata piece index is too big. piece=%lu",
                          static_cast<unsigned long>(getIndex())));
  }
}

void UTMetadataRequestExtensionMessage::setDownloadContext(
    DownloadContext* dctx)
{
  dctx_ = dctx;
}

void UTMetadataRequestExtensionMessage::setPeer(
    const std::shared_ptr<Peer>& peer)
{
  peer_ = peer;
}

void UTMetadataRequestExtensionMessage::setBtMessageDispatcher(
    BtMessageDispatcher* disp)
{
  dispatcher_ = disp;
}

void UTMetadataRequestExtensionMessage::setBtMessageFactory(
    BtMessageFactory* factory)
{
  messageFactory_ = factory;
}

} // namespace aria2