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/** bwcontroller.c
*
* Copyright (C) 2013-2015 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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 3 of the License, or
* (at your option) any later version.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <assert.h>
#include "bwcontroller.h"
#include "../toxcore/logger.h"
#include "../toxcore/util.h"
#define BWC_PACKET_ID 196
#define BWC_SEND_INTERVAL_MS 1000
#define BWC_REFRESH_INTERVAL_MS 10000
#define BWC_AVG_PKT_COUNT 20
/**
*
*/
struct BWController_s {
void (*mcb) (BWController *, uint32_t, float, void *);
void *mcb_data;
Messenger *m;
uint32_t friend_number;
struct {
uint32_t lru; /* Last recv update time stamp */
uint32_t lsu; /* Last sent update time stamp */
uint32_t lfu; /* Last refresh time stamp */
uint32_t lost;
uint32_t recv;
} cycle;
struct {
uint32_t rb_s[BWC_AVG_PKT_COUNT];
RingBuffer *rb;
} rcvpkt; /* To calculate average received packet */
};
int bwc_handle_data(Messenger *m, uint32_t friendnumber, const uint8_t *data, uint16_t length, void *object);
void send_update(BWController *bwc);
BWController *bwc_new(Messenger *m, uint32_t friendnumber,
void (*mcb) (BWController *, uint32_t, float, void *),
void *udata)
{
BWController *retu = calloc(sizeof(struct BWController_s), 1);
retu->mcb = mcb;
retu->mcb_data = udata;
retu->m = m;
retu->friend_number = friendnumber;
retu->cycle.lsu = retu->cycle.lfu = current_time_monotonic();
retu->rcvpkt.rb = rb_new(BWC_AVG_PKT_COUNT);
/* Fill with zeros */
int i = 0;
for (; i < BWC_AVG_PKT_COUNT; i ++)
rb_write(retu->rcvpkt.rb, retu->rcvpkt.rb_s + i);
m_callback_rtp_packet(m, friendnumber, BWC_PACKET_ID, bwc_handle_data, retu);
return retu;
}
void bwc_kill(BWController *bwc)
{
if (!bwc)
return;
m_callback_rtp_packet(bwc->m, bwc->friend_number, BWC_PACKET_ID, NULL, NULL);
rb_kill(bwc->rcvpkt.rb);
free(bwc);
}
void bwc_feed_avg(BWController *bwc, uint32_t bytes)
{
uint32_t *p;
rb_read(bwc->rcvpkt.rb, (void **) &p);
rb_write(bwc->rcvpkt.rb, p);
*p = bytes;
}
void bwc_add_lost(BWController *bwc, uint32_t bytes)
{
if (!bwc)
return;
if (!bytes) {
uint32_t *t_avg[BWC_AVG_PKT_COUNT], c = 1;
rb_data(bwc->rcvpkt.rb, (void **) t_avg);
int i = 0;
for (; i < BWC_AVG_PKT_COUNT; i ++) {
bytes += *(t_avg[i]);
if (*(t_avg[i]))
c++;
}
bytes /= c;
}
bwc->cycle.lost += bytes;
send_update(bwc);
}
void bwc_add_recv(BWController *bwc, uint32_t bytes)
{
if (!bwc || !bytes)
return;
bwc->cycle.recv += bytes;
send_update(bwc);
}
struct BWCMessage {
uint32_t lost;
uint32_t recv;
};
void send_update(BWController *bwc)
{
if (current_time_monotonic() - bwc->cycle.lfu > BWC_REFRESH_INTERVAL_MS) {
bwc->cycle.lost /= 10;
bwc->cycle.recv /= 10;
bwc->cycle.lfu = current_time_monotonic();
} else if (current_time_monotonic() - bwc->cycle.lsu > BWC_SEND_INTERVAL_MS) {
if (bwc->cycle.lost) {
LOGGER_DEBUG ("%p Sent update rcv: %u lost: %u",
bwc, bwc->cycle.recv, bwc->cycle.lost);
uint8_t p_msg[sizeof(struct BWCMessage) + 1];
struct BWCMessage *b_msg = (struct BWCMessage *)(p_msg + 1);
p_msg[0] = BWC_PACKET_ID;
b_msg->lost = htonl(bwc->cycle.lost);
b_msg->recv = htonl(bwc->cycle.recv);
if (-1 == send_custom_lossy_packet(bwc->m, bwc->friend_number, p_msg, sizeof(p_msg)))
LOGGER_WARNING("BWC send failed (len: %d)! std error: %s", sizeof(p_msg), strerror(errno));
}
bwc->cycle.lsu = current_time_monotonic();
}
}
int on_update (BWController *bwc, struct BWCMessage *msg)
{
LOGGER_DEBUG ("%p Got update from peer", bwc);
/* Peer must respect time boundary */
if (current_time_monotonic() < bwc->cycle.lru + BWC_SEND_INTERVAL_MS) {
LOGGER_DEBUG("%p Rejecting extra update", bwc);
return -1;
}
bwc->cycle.lru = current_time_monotonic();
msg->recv = ntohl(msg->recv);
msg->lost = ntohl(msg->lost);
LOGGER_DEBUG ("recved: %u lost: %u", msg->recv, msg->lost);
if (msg->lost && bwc->mcb)
bwc->mcb(bwc, bwc->friend_number,
((float) (msg->lost) / (msg->recv + msg->lost)),
bwc->mcb_data);
return 0;
}
int bwc_handle_data(Messenger *m, uint32_t friendnumber, const uint8_t *data, uint16_t length, void *object)
{
if (length - 1 != sizeof(struct BWCMessage))
return -1;
/* NOTE the data is mutable */
return on_update(object, (struct BWCMessage *) (data + 1));
}
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