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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 "DHTMessageTracker.h"
#include <utility>
#include "DHTMessage.h"
#include "DHTMessageCallback.h"
#include "DHTMessageTrackerEntry.h"
#include "DHTNode.h"
#include "DHTRoutingTable.h"
#include "DHTMessageFactory.h"
#include "util.h"
#include "LogFactory.h"
#include "Logger.h"
#include "DlAbortEx.h"
#include "DHTConstants.h"
#include "fmt.h"
namespace aria2 {
DHTMessageTracker::DHTMessageTracker() {}
DHTMessageTracker::~DHTMessageTracker() {}
void DHTMessageTracker::addMessage(const SharedHandle<DHTMessage>& message, time_t timeout, const SharedHandle<DHTMessageCallback>& callback)
{
SharedHandle<DHTMessageTrackerEntry> e(new DHTMessageTrackerEntry(message, timeout, callback));
entries_.push_back(e);
}
std::pair<SharedHandle<DHTResponseMessage>, SharedHandle<DHTMessageCallback> >
DHTMessageTracker::messageArrived
(const Dict* dict, const std::string& ipaddr, uint16_t port)
{
const String* tid = downcast<String>(dict->get(DHTMessage::T));
if(!tid) {
throw DL_ABORT_EX(fmt("Malformed DHT message. From:%s:%u",
ipaddr.c_str(), port));
}
A2_LOG_DEBUG(fmt("Searching tracker entry for TransactionID=%s, Remote=%s:%u",
util::toHex(tid->s()).c_str(),
ipaddr.c_str(), port));
for(std::deque<SharedHandle<DHTMessageTrackerEntry> >::iterator i =
entries_.begin(), eoi = entries_.end(); i != eoi; ++i) {
if((*i)->match(tid->s(), ipaddr, port)) {
SharedHandle<DHTMessageTrackerEntry> entry = *i;
entries_.erase(i);
A2_LOG_DEBUG("Tracker entry found.");
SharedHandle<DHTNode> targetNode = entry->getTargetNode();
try {
SharedHandle<DHTResponseMessage> message =
factory_->createResponseMessage(entry->getMessageType(), dict,
targetNode->getIPAddress(),
targetNode->getPort());
int64_t rtt = entry->getElapsedMillis();
A2_LOG_DEBUG(fmt("RTT is %lld", static_cast<long long int>(rtt)));
message->getRemoteNode()->updateRTT(rtt);
SharedHandle<DHTMessageCallback> callback = entry->getCallback();
if(!(*targetNode == *message->getRemoteNode())) {
// Node ID has changed. Drop previous node ID from
// DHTRoutingTable
A2_LOG_DEBUG
(fmt("Node ID has changed: old:%s, new:%s",
util::toHex(targetNode->getID(), DHT_ID_LENGTH).c_str(),
util::toHex(message->getRemoteNode()->getID(),
DHT_ID_LENGTH).c_str()));
routingTable_->dropNode(targetNode);
}
return std::make_pair(message, callback);
} catch(RecoverableException& e) {
handleTimeoutEntry(entry);
throw;
}
}
}
A2_LOG_DEBUG("Tracker entry not found.");
return std::pair<SharedHandle<DHTResponseMessage>,
SharedHandle<DHTMessageCallback> >();
}
void DHTMessageTracker::handleTimeoutEntry
(const SharedHandle<DHTMessageTrackerEntry>& entry)
{
try {
SharedHandle<DHTNode> node = entry->getTargetNode();
A2_LOG_DEBUG(fmt("Message timeout: To:%s:%u",
node->getIPAddress().c_str(), node->getPort()));
node->updateRTT(entry->getElapsedMillis());
node->timeout();
if(node->isBad()) {
A2_LOG_DEBUG(fmt("Marked bad: %s:%u",
node->getIPAddress().c_str(), node->getPort()));
routingTable_->dropNode(node);
}
SharedHandle<DHTMessageCallback> callback = entry->getCallback();
if(callback) {
callback->onTimeout(node);
}
} catch(RecoverableException& e) {
A2_LOG_INFO_EX("Exception thrown while handling timeouts.", e);
}
}
void DHTMessageTracker::handleTimeout()
{
for(std::deque<SharedHandle<DHTMessageTrackerEntry> >::iterator i =
entries_.begin(), eoi = entries_.end(); i != eoi;) {
if((*i)->isTimeout()) {
SharedHandle<DHTMessageTrackerEntry> entry = *i;
i = entries_.erase(i);
eoi = entries_.end();
handleTimeoutEntry(entry);
} else {
++i;
}
}
}
SharedHandle<DHTMessageTrackerEntry>
DHTMessageTracker::getEntryFor(const SharedHandle<DHTMessage>& message) const
{
for(std::deque<SharedHandle<DHTMessageTrackerEntry> >::const_iterator i =
entries_.begin(), eoi = entries_.end(); i != eoi; ++i) {
if((*i)->match(message->getTransactionID(),
message->getRemoteNode()->getIPAddress(),
message->getRemoteNode()->getPort())) {
return *i;
}
}
return SharedHandle<DHTMessageTrackerEntry>();
}
size_t DHTMessageTracker::countEntry() const
{
return entries_.size();
}
void DHTMessageTracker::setRoutingTable
(const SharedHandle<DHTRoutingTable>& routingTable)
{
routingTable_ = routingTable;
}
void DHTMessageTracker::setMessageFactory
(const SharedHandle<DHTMessageFactory>& factory)
{
factory_ = factory;
}
} // namespace aria2
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