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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* 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. *
***************************************************************************/
#include <math.h>
#include <util/functions.h>
#include <util/log.h>
#include <torrent/globals.h>
#include "upspeedestimater.h"
namespace bt
{
UpSpeedEstimater::UpSpeedEstimater()
{
accumulated_bytes = 0;
upload_rate = 0.0;
proto_upload_rate = 0.0;
}
UpSpeedEstimater::~UpSpeedEstimater()
{}
void UpSpeedEstimater::writeBytes(Uint32 bytes,bool proto)
{
// add entry to outstanding_bytes
Entry e;
e.bytes = bytes;
e.data = !proto;
e.start_time = GetCurrentTime();
outstanding_bytes.append(e);
}
void UpSpeedEstimater::bytesWritten(Uint32 bytes)
{
QValueList<Entry>::iterator i = outstanding_bytes.begin();
TimeStamp now = GetCurrentTime();
while (bytes > 0 && i != outstanding_bytes.end())
{
Entry e = *i;
if (e.bytes <= bytes + accumulated_bytes)
{
// first remove outstanding bytes
i = outstanding_bytes.erase(i);
bytes -= e.bytes;
accumulated_bytes = 0;
if (e.data)
{
// if it's data move it to the written_bytes list
// but first store time it takes to send in e.t
e.duration = now - e.start_time;
written_bytes.append(e);
}
else
{
e.duration = now - e.start_time;
#ifdef MEASURE_PROTO_OVERHEAD
proto_bytes.append(e);
#endif
}
}
else
{
accumulated_bytes += bytes;
bytes = 0;
}
}
}
double UpSpeedEstimater::rate(QValueList<Entry> & el)
{
TimeStamp now = GetCurrentTime();
const Uint32 INTERVAL = 3000;
Uint32 tot_bytes = 0;
Uint32 oldest_time = now;
QValueList<Entry>::iterator i = el.begin();
while (i != el.end())
{
Entry & e = *i;
Uint32 end_time = e.start_time + e.duration;
if (now - end_time > INTERVAL)
{
// get rid of old entries
i = el.erase(i);
}
else if (now - e.start_time <= INTERVAL)
{
// entry was fully sent in the last 3 seconds
// so fully add it
tot_bytes += e.bytes;
if (e.start_time < oldest_time)
oldest_time = e.start_time;
i++;
}
else
{
// entry was partially sent in the last 3 seconds
// so we need to take into account a part of the bytes;
Uint32 part_dur = end_time - (now - INTERVAL);
double dur_perc = (double)part_dur / e.duration;
tot_bytes += (Uint32)ceil(dur_perc * e.bytes);
oldest_time = (now - INTERVAL);
i++;
}
}
return (double)tot_bytes / (INTERVAL * 0.001);
}
void UpSpeedEstimater::update()
{
if (!written_bytes.empty())
{
upload_rate = 0;
upload_rate = rate(written_bytes);
}
#ifdef MEASURE_PROTO_OVERHEAD
if (!proto_bytes.empty())
{
proto_upload_rate = 0;
proto_upload_rate = rate(proto_bytes);
}
#endif
}
}
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