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/* <!-- 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 "DHTPeerLookupTask.h"
#include "Peer.h"
#include "DHTGetPeersReplyMessage.h"
#include "Logger.h"
#include "LogFactory.h"
#include "DHTMessageFactory.h"
#include "DHTNode.h"
#include "DHTNodeLookupEntry.h"
#include "DHTMessageDispatcher.h"
#include "DHTMessageCallback.h"
#include "PeerStorage.h"
#include "util.h"
#include "DHTBucket.h"
#include "bittorrent_helper.h"
#include "DHTPeerLookupTaskCallback.h"
#include "DHTQueryMessage.h"
#include "DHTGetPeersMessage.h"
#include "DHTAnnouncePeerMessage.h"
#include "fmt.h"
namespace aria2 {
DHTPeerLookupTask::DHTPeerLookupTask(
const std::shared_ptr<DownloadContext>& downloadContext, uint16_t tcpPort)
: DHTAbstractNodeLookupTask<DHTGetPeersReplyMessage>(
bittorrent::getInfoHash(downloadContext)),
tcpPort_(tcpPort)
{
}
void DHTPeerLookupTask::getNodesFromMessage(
std::vector<std::shared_ptr<DHTNode>>& nodes,
const DHTGetPeersReplyMessage* message)
{
auto& knodes = message->getClosestKNodes();
nodes.insert(std::end(nodes), std::begin(knodes), std::end(knodes));
}
void DHTPeerLookupTask::onReceivedInternal(
const DHTGetPeersReplyMessage* message)
{
std::shared_ptr<DHTNode> remoteNode = message->getRemoteNode();
tokenStorage_[util::toHex(remoteNode->getID(), DHT_ID_LENGTH)] =
message->getToken();
peerStorage_->addPeer(message->getValues());
A2_LOG_INFO(fmt("Received %lu peers.",
static_cast<unsigned long>(message->getValues().size())));
}
std::unique_ptr<DHTMessage>
DHTPeerLookupTask::createMessage(const std::shared_ptr<DHTNode>& remoteNode)
{
return getMessageFactory()->createGetPeersMessage(remoteNode, getTargetID());
}
std::unique_ptr<DHTMessageCallback> DHTPeerLookupTask::createCallback()
{
return make_unique<DHTPeerLookupTaskCallback>(this);
}
void DHTPeerLookupTask::onFinish()
{
A2_LOG_DEBUG(fmt("Peer lookup for %s finished",
util::toHex(getTargetID(), DHT_ID_LENGTH).c_str()));
// send announce_peer message to K closest nodes
size_t num = DHTBucket::K;
for (auto i = std::begin(getEntries()), eoi = std::end(getEntries());
i != eoi && num > 0; ++i) {
if (!(*i)->used) {
continue;
}
auto& node = (*i)->node;
std::string idHex = util::toHex(node->getID(), DHT_ID_LENGTH);
std::string token = tokenStorage_[idHex];
if (token.empty()) {
A2_LOG_DEBUG(fmt("Token is empty for ID:%s", idHex.c_str()));
continue;
}
getMessageDispatcher()->addMessageToQueue(
getMessageFactory()->createAnnouncePeerMessage(
node,
getTargetID(), // this is infoHash
tcpPort_, token));
--num;
}
}
void DHTPeerLookupTask::setPeerStorage(const std::shared_ptr<PeerStorage>& ps)
{
peerStorage_ = ps;
}
} // namespace aria2
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