aria2/src/Metalink2RequestGroup.cc

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 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 "Metalink2RequestGroup.h"
#include "RequestGroup.h"
#include "Option.h"
#include "LogFactory.h"
#include "prefs.h"
#include "Xml2MetalinkProcessor.h"
#include "Util.h"
#include "message.h"
#include "RecoverableException.h"
#include "BtDependency.h"
#include "SingleFileDownloadContext.h"

Metalink2RequestGroup::Metalink2RequestGroup(const Option* option):_option(option), _logger(LogFactory::getInstance()) {}

Metalink2RequestGroup::~Metalink2RequestGroup() {}

class AccumulateNonP2PUrl {
private:
  Strings* urlsPtr;
  int32_t split;
public:
  AccumulateNonP2PUrl(Strings* urlsPtr, int32_t split)
    :urlsPtr(urlsPtr),
     split(split) {}

  void operator()(const MetalinkResourceHandle& resource) {
    int32_t maxConnections;
    if(resource->maxConnections < 0) {
      maxConnections = split;
    } else {
      maxConnections = min<int32_t>(resource->maxConnections, split);
    }
    switch(resource->type) {
    case MetalinkResource::TYPE_HTTP:
    case MetalinkResource::TYPE_HTTPS:
    case MetalinkResource::TYPE_FTP:
      for(int32_t s = 1; s <= maxConnections; s++) {
	urlsPtr->push_back(resource->url);
      }
      break;
    default:
      break;
    }
  }
};

class FindBitTorrentUrl {
public:
  FindBitTorrentUrl() {}

  bool operator()(const MetalinkResourceHandle& resource) {
    if(resource->type == MetalinkResource::TYPE_BITTORRENT) {
      return true;
    } else {
      return false;
    }
  }
};

RequestGroups Metalink2RequestGroup::generate(const string& metalinkFile)
{
  Xml2MetalinkProcessor proc;
  try {
    MetalinkerHandle metalinker = proc.parseFile(metalinkFile);
    MetalinkEntries entries =
      metalinker->queryEntry(_option->get(PREF_METALINK_VERSION),
			     _option->get(PREF_METALINK_LANGUAGE),
			     _option->get(PREF_METALINK_OS));
    if(entries.size() == 0) {
      return RequestGroups();
    }
    bool useIndex;
    Integers selectIndexes;
    Util::unfoldRange(_option->get(PREF_SELECT_FILE), selectIndexes);
    if(selectIndexes.size()) {
      useIndex = true;
    } else {
      useIndex = false;
    }
    RequestGroups groups;
    int32_t count = 0;
    for(MetalinkEntries::iterator itr = entries.begin(); itr != entries.end();
	itr++, ++count) {
      MetalinkEntryHandle& entry = *itr;
      if(_option->defined(PREF_METALINK_LOCATION)) {
	entry->setLocationPreference(_option->get(PREF_METALINK_LOCATION), 100);
      }
      if(useIndex) {
	if(find(selectIndexes.begin(), selectIndexes.end(), count+1) == selectIndexes.end()) {
	  continue;
	}
      }
      entry->dropUnsupportedResource();
      if(entry->resources.size() == 0) {
	continue;
      }
      _logger->info(MSG_METALINK_QUEUEING, entry->getPath().c_str());
      MetalinkResources::iterator itr = find_if(entry->resources.begin(),
						entry->resources.end(),
						FindBitTorrentUrl());
      RequestGroupHandle torrentRg = 0;
      // there is torrent entry
      if(itr != entry->resources.end()) {
	Strings uris;
	uris.push_back((*itr)->url);
	torrentRg = new RequestGroup(_option, uris);
	SingleFileDownloadContextHandle dctx =
	  new SingleFileDownloadContext(_option->getAsInt(PREF_SEGMENT_SIZE),
					0,
					"");
	dctx->setDir(_option->get(PREF_DIR));
	torrentRg->setDownloadContext(dctx);
	torrentRg->clearPostDowloadHandler();
	groups.push_back(torrentRg);
      }
      entry->reorderResourcesByPreference();
      Strings uris;
      for_each(entry->resources.begin(), entry->resources.end(),
	       AccumulateNonP2PUrl(&uris, _option->getAsInt(PREF_SPLIT)));
      RequestGroupHandle rg = new RequestGroup(_option, uris);
      // If piece hash is specified in the metalink,
      // make segment size equal to piece hash size.
      int32_t pieceLength;
      if(entry->chunkChecksum.isNull()) {
	pieceLength = _option->getAsInt(PREF_SEGMENT_SIZE);
      } else {
	pieceLength = entry->chunkChecksum->getChecksumLength();
      }
      SingleFileDownloadContextHandle dctx =
	new SingleFileDownloadContext(pieceLength,
				      0,
				      "");
      dctx->setDir(_option->get(PREF_DIR));
      if(!entry->chunkChecksum.isNull()) {
	dctx->setPieceHashes(entry->chunkChecksum->getChecksums());
	dctx->setPieceHashAlgo(entry->chunkChecksum->getAlgo());
      }
      // TODO set checksum here to DownloadContext
      // * hash and hash algorithm

      rg->setDownloadContext(dctx);
      rg->setHintFilename(entry->file->getBasename());
      rg->setHintTotalLength(entry->getLength());
      rg->setNumConcurrentCommand(entry->maxConnections < 0 ?
				  _option->getAsInt(PREF_METALINK_SERVERS) :
				  min<int32_t>(_option->getAsInt(PREF_METALINK_SERVERS), entry->maxConnections));

      // Inject depenency between rg and torrentRg here if torrentRg.isNull() == false
      if(!torrentRg.isNull()) {
	rg->dependsOn(new BtDependency(rg, torrentRg, _option));
      }

      groups.push_back(rg);
    }
    return groups;
  } catch(RecoverableException* ex) {
    _logger->error(EX_EXCEPTION_CAUGHT, ex);
    delete ex;
    return RequestGroups();
  }
}