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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2013 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 --> */
#ifndef D_UDP_TRACKER_CLIENT_H
#define D_UDP_TRACKER_CLIENT_H
#include "common.h"
#include <string>
#include <deque>
#include <map>
#include "SharedHandle.h"
#include "TimerA2.h"
namespace aria2 {
#define UDPT_INITIAL_CONNECTION_ID 0x41727101980LL
struct UDPTrackerRequest;
enum UDPTrackerConnectionState {
UDPT_CST_CONNECTING,
UDPT_CST_CONNECTED
};
struct UDPTrackerConnection {
int state;
int64_t connectionId;
Timer lastUpdated;
UDPTrackerConnection()
: state(UDPT_CST_CONNECTING),
connectionId(UDPT_INITIAL_CONNECTION_ID),
lastUpdated(0)
{}
UDPTrackerConnection(int state, int64_t connectionId,
const Timer& lastUpdated)
: state(state),
connectionId(connectionId),
lastUpdated(lastUpdated)
{}
};
class UDPTrackerClient {
public:
UDPTrackerClient();
~UDPTrackerClient();
int receiveReply
(const unsigned char* data, size_t length, const std::string& remoteAddr,
uint16_t remotePort, const Timer& now);
// Creates data frame for the next pending request. This function
// always processes first entry of pendingRequests_. If the data is
// sent successfully, call requestSent(). Otherwise call
// requestFail().
ssize_t createRequest
(unsigned char* data, size_t length, std::string& remoteAddr,
uint16_t& remotePort, const Timer& now);
// Tells this object that first entry of pendingRequests_ is
// successfully sent.
void requestSent(const Timer& now);
// Tells this object that first entry of pendingRequests_ is not
// successfully sent. The |error| should indicate error situation.
void requestFail(int error);
void addRequest(const SharedHandle<UDPTrackerRequest>& req);
// Handles timeout for inflight requests.
void handleTimeout(const Timer& now);
const std::deque<SharedHandle<UDPTrackerRequest> >&
getPendingRequests() const
{
return pendingRequests_;
}
const std::deque<SharedHandle<UDPTrackerRequest> >&
getConnectRequests() const
{
return connectRequests_;
}
const std::deque<SharedHandle<UDPTrackerRequest> >&
getInflightRequests() const
{
return inflightRequests_;
}
bool noRequest() const
{
return pendingRequests_.empty() && connectRequests_.empty() &&
getInflightRequests().empty();
}
// Makes all contained requests fail.
void failAll();
int getNumWatchers() const
{
return numWatchers_;
}
void increaseWatchers();
void decreaseWatchers();
// Actually private function, but made public, to be used by unnamed
// function.
void failConnect(const std::string& remoteAddr, uint16_t remotePort,
int error);
private:
SharedHandle<UDPTrackerRequest> findInflightRequest
(const std::string& remoteAddr, uint16_t remotePort, int32_t transactionId,
bool remove);
UDPTrackerConnection* getConnectionId
(const std::string& remoteAddr, uint16_t remotePort, const Timer& now);
std::map<std::pair<std::string, uint16_t>,
UDPTrackerConnection> connectionIdCache_;
std::deque<SharedHandle<UDPTrackerRequest> > inflightRequests_;
std::deque<SharedHandle<UDPTrackerRequest> > pendingRequests_;
std::deque<SharedHandle<UDPTrackerRequest> > connectRequests_;
int numWatchers_;
};
ssize_t createUDPTrackerConnect
(unsigned char* data, size_t length, std::string& remoteAddr,
uint16_t& remotePort, const SharedHandle<UDPTrackerRequest>& req);
ssize_t createUDPTrackerAnnounce
(unsigned char* data, size_t length, std::string& remoteAddr,
uint16_t& remotePort, const SharedHandle<UDPTrackerRequest>& req);
const char* getUDPTrackerActionStr(int action);
const char* getUDPTrackerEventStr(int event);
} // namespace aria2
#endif // D_UDP_TRACKER_CLIENT_H
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