157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2006-2008 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#include <string.h> /* memset */
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#include "transmission.h"
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#include "platform.h"
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#include "ratecontrol.h"
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#include "utils.h"
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#define GRANULARITY_MSEC 500
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#define SHORT_INTERVAL_MSEC 4000
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#define LONG_INTERVAL_MSEC 8000
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#define HISTORY_SIZE (LONG_INTERVAL_MSEC / GRANULARITY_MSEC)
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struct tr_transfer
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{
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uint64_t date;
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uint64_t size;
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};
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struct tr_ratecontrol
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{
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int limit;
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int newest;
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struct tr_transfer transfers[HISTORY_SIZE];
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};
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/* return the xfer rate over the last `interval' seconds in KiB/sec */
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static float
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rateForInterval( const tr_ratecontrol * r, int interval_msec )
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{
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uint64_t bytes = 0;
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const uint64_t cutoff = tr_date () - interval_msec;
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int i = r->newest;
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for( ;; )
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{
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if( r->transfers[i].date < cutoff )
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break;
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bytes += r->transfers[i].size;
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if( --i == -1 ) i = HISTORY_SIZE - 1; /* circular history */
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if( i == r->newest ) break; /* we've come all the way around */
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}
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return (bytes/1024.0) * (1000.0/interval_msec);
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}
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/***
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****
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***/
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tr_ratecontrol*
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tr_rcInit( void )
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{
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tr_ratecontrol * r = tr_new0( tr_ratecontrol, 1 );
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r->limit = 0;
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return r;
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}
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void
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tr_rcClose( tr_ratecontrol * r )
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{
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tr_rcReset( r );
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tr_free( r );
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}
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/***
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****
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***/
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size_t
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tr_rcBytesLeft( const tr_ratecontrol * r )
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{
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size_t bytes = 0;
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if( r != NULL )
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{
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const float cur = rateForInterval( r, SHORT_INTERVAL_MSEC );
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const float max = r->limit;
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const float kb = max>cur ? max-cur : 0;
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bytes = (size_t)(kb * 1024);
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}
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return bytes;
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}
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float
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tr_rcRate( const tr_ratecontrol * r )
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{
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float ret = 0.0f;
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if( r )
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ret = rateForInterval( r, LONG_INTERVAL_MSEC );
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return ret;
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}
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/***
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****
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***/
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void
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tr_rcTransferred( tr_ratecontrol * r, size_t size )
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{
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const uint64_t now = tr_date ();
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if( r->transfers[r->newest].date + GRANULARITY_MSEC >= now )
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r->transfers[r->newest].size += size;
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else {
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if( ++r->newest == HISTORY_SIZE ) r->newest = 0;
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r->transfers[r->newest].date = now;
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r->transfers[r->newest].size = size;
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}
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}
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void
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tr_rcReset( tr_ratecontrol * r )
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{
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r->newest = 0;
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memset( r->transfers, 0, sizeof(struct tr_transfer) * HISTORY_SIZE );
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}
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void
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tr_rcSetLimit( tr_ratecontrol * r, int limit )
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{
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r->limit = limit;
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}
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int
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tr_rcGetLimit( const tr_ratecontrol * r )
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{
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return r->limit;
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}
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