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tracker_controller.cc
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tracker_controller.cc
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// libTorrent - BitTorrent library
// Copyright (C) 2005-2011, Jari Sundell
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.
//
// Contact: Jari Sundell <jaris@ifi.uio.no>
//
// Skomakerveien 33
// 3185 Skoppum, NORWAY
#include "config.h"
#include "exceptions.h"
#include "download_info.h"
#include "tracker.h"
#include "tracker_controller.h"
#include "tracker_list.h"
#include "rak/priority_queue_default.h"
#include "utils/log.h"
#include "globals.h"
#define LT_LOG_TRACKER(log_level, log_fmt, ...) \
lt_log_print_info(LOG_TRACKER_##log_level, m_tracker_list->info(), "tracker_controller", log_fmt, __VA_ARGS__);
namespace torrent {
struct tracker_controller_private {
rak::priority_item task_timeout;
rak::priority_item task_scrape;
};
// End temp hacks...
void
TrackerController::update_timeout(uint32_t seconds_to_next) {
if (!(m_flags & flag_active))
throw internal_error("TrackerController cannot set timeout when inactive.");
rak::timer next_timeout = cachedTime;
if (seconds_to_next != 0)
next_timeout = (cachedTime + rak::timer::from_seconds(seconds_to_next)).round_seconds();
priority_queue_erase(&taskScheduler, &m_private->task_timeout);
priority_queue_insert(&taskScheduler, &m_private->task_timeout, next_timeout);
}
inline int
TrackerController::current_send_state() const {
switch ((m_flags & mask_send)) {
case flag_send_start: return Tracker::EVENT_STARTED;
case flag_send_stop: return Tracker::EVENT_STOPPED;
case flag_send_completed: return Tracker::EVENT_COMPLETED;
case flag_send_update:
default: return Tracker::EVENT_NONE;
}
}
TrackerController::TrackerController(TrackerList* trackers) :
m_flags(0),
m_tracker_list(trackers),
m_private(new tracker_controller_private) {
m_private->task_timeout.slot() = std::bind(&TrackerController::do_timeout, this);
m_private->task_scrape.slot() = std::bind(&TrackerController::do_scrape, this);
}
TrackerController::~TrackerController() {
priority_queue_erase(&taskScheduler, &m_private->task_timeout);
priority_queue_erase(&taskScheduler, &m_private->task_scrape);
delete m_private;
}
rak::priority_item*
TrackerController::task_timeout() {
return &m_private->task_timeout;
}
rak::priority_item*
TrackerController::task_scrape() {
return &m_private->task_scrape;
}
int64_t
TrackerController::next_timeout() const {
return m_private->task_timeout.time().usec();
}
int64_t
TrackerController::next_scrape() const {
return m_private->task_scrape.time().usec();
}
uint32_t
TrackerController::seconds_to_next_timeout() const {
return std::max(m_private->task_timeout.time() - cachedTime, rak::timer()).seconds_ceiling();
}
uint32_t
TrackerController::seconds_to_next_scrape() const {
return std::max(m_private->task_scrape.time() - cachedTime, rak::timer()).seconds_ceiling();
}
void
TrackerController::manual_request(bool request_now) {
if (!m_private->task_timeout.is_queued())
return;
// Add functions to get the lowest timeout, etc...
send_update_event();
}
void
TrackerController::scrape_request(uint32_t seconds_to_request) {
rak::timer next_timeout = cachedTime;
if (seconds_to_request != 0)
next_timeout = (cachedTime + rak::timer::from_seconds(seconds_to_request)).round_seconds();
priority_queue_erase(&taskScheduler, &m_private->task_scrape);
priority_queue_insert(&taskScheduler, &m_private->task_scrape, next_timeout);
}
// The send_*_event() functions tries to ensure the relevant trackers
// receive the event.
//
// When we just want more peers the start_requesting() function is
// used. This is all independent of the regular updates sent to the
// trackers.
void
TrackerController::send_start_event() {
// This will now be 'lazy', rather than a definite event. We tell
// the controller that a 'start' event should be sent, and it will
// send it when the tracker controller get's enabled.
// If the controller is already running, we insert this new event.
// Return, or something, if already active and sending?
if (m_flags & flag_send_start) {
// Do we just return, or bork? At least we need to check to see
// that there's something requesting 'start' event or fail hard.
}
m_flags &= ~mask_send;
m_flags |= flag_send_start;
if (!(m_flags & flag_active) || !m_tracker_list->has_usable()) {
LT_LOG_TRACKER(INFO, "Queueing started event.", 0);
return;
}
// Start with requesting from the first tracker. Add timer to
// catch when we don't get any response within the first few
// seconds, at which point we go promiscious.
// Do we use the old 'focus' thing?... Rather react on no reply,
// go into promiscious.
LT_LOG_TRACKER(INFO, "Sending started event.", 0);
close();
m_tracker_list->send_state_itr(m_tracker_list->find_usable(m_tracker_list->begin()), Tracker::EVENT_STARTED);
if (m_tracker_list->count_usable() > 1) {
m_flags |= flag_promiscuous_mode;
update_timeout(3);
}
}
void
TrackerController::send_stop_event() {
if (m_flags & flag_send_stop) {
// Do we just return, or bork? At least we need to check to see
// that there's something requesting 'start' event or fail hard.
}
m_flags &= ~mask_send;
if (!(m_flags & flag_active) || !m_tracker_list->has_usable()) {
LT_LOG_TRACKER(INFO, "Skipping stopped event as no tracker need it.", 0);
return;
}
m_flags |= flag_send_stop;
LT_LOG_TRACKER(INFO, "Sending stopped event.", 0);
close();
for (TrackerList::iterator itr = m_tracker_list->begin(); itr != m_tracker_list->end(); itr++) {
if (!(*itr)->is_in_use())
continue;
m_tracker_list->send_state(*itr, Tracker::EVENT_STOPPED);
}
// Timer...
}
void
TrackerController::send_completed_event() {
if (m_flags & flag_send_completed) {
// Do we just return, or bork? At least we need to check to see
// that there's something requesting 'start' event or fail hard.
}
m_flags &= ~mask_send;
m_flags |= flag_send_completed;
if (!(m_flags & flag_active) || !m_tracker_list->has_usable()) {
LT_LOG_TRACKER(INFO, "Queueing completed event.", 0);
return;
}
LT_LOG_TRACKER(INFO, "Sending completed event.", 0);
// Send to all trackers that would want to know.
close();
for (TrackerList::iterator itr = m_tracker_list->begin(); itr != m_tracker_list->end(); itr++) {
if (!(*itr)->is_in_use())
continue;
m_tracker_list->send_state(*itr, Tracker::EVENT_COMPLETED);
}
// Timer...
}
void
TrackerController::send_update_event() {
if (!(m_flags & flag_active) || !m_tracker_list->has_usable())
return;
if ((m_flags & mask_send) && m_tracker_list->has_active())
return;
// We can lose a state here...
if (!(m_flags & mask_send))
m_flags |= flag_send_update;
LT_LOG_TRACKER(INFO, "Sending update event.", 0);
m_tracker_list->send_state_itr(m_tracker_list->find_usable(m_tracker_list->begin()), Tracker::EVENT_NONE);
// if (m_tracker_list->has_active())
// priority_queue_erase(&taskScheduler, &m_private->task_timeout);
}
// Currently being used by send_state, fixme.
void
TrackerController::close(int flags) {
m_flags &= ~(flag_requesting | flag_promiscuous_mode);
if ((flags & (close_disown_stop | close_disown_completed)))
m_tracker_list->disown_all_including(close_disown_stop | close_disown_completed);
m_tracker_list->close_all();
priority_queue_erase(&taskScheduler, &m_private->task_timeout);
}
void
TrackerController::enable(int enable_flags) {
if ((m_flags & flag_active))
return;
// Clearing send stop here in case we cycle disable/enable too
// fast. In the future do this based on flags passed.
m_flags |= flag_active;
m_flags &= ~flag_send_stop;
m_tracker_list->close_all_excluding((1 << Tracker::EVENT_COMPLETED));
if (!(enable_flags & enable_dont_reset_stats))
m_tracker_list->clear_stats();
LT_LOG_TRACKER(INFO, "Called enable with %u trackers.", m_tracker_list->size());
// Adding of the tracker requests gets done after the caller has had
// a chance to override the default behavior.
update_timeout(0);
}
void
TrackerController::disable() {
if (!(m_flags & flag_active))
return;
// Disable other flags?...
m_flags &= ~(flag_active | flag_requesting | flag_promiscuous_mode);
m_tracker_list->close_all_excluding((1 << Tracker::EVENT_STOPPED) | (1 << Tracker::EVENT_COMPLETED));
priority_queue_erase(&taskScheduler, &m_private->task_timeout);
LT_LOG_TRACKER(INFO, "Called disable with %u trackers.", m_tracker_list->size());
}
void
TrackerController::start_requesting() {
if ((m_flags & flag_requesting))
return;
m_flags |= flag_requesting;
if ((m_flags & flag_active))
update_timeout(0);
LT_LOG_TRACKER(INFO, "Start requesting.", 0);
}
void
TrackerController::stop_requesting() {
if (!(m_flags & flag_requesting))
return;
m_flags &= ~flag_requesting;
LT_LOG_TRACKER(INFO, "Stop requesting.", 0);
}
uint32_t
tracker_next_timeout(Tracker* tracker, int controller_flags) {
if ((controller_flags & TrackerController::flag_requesting))
return tracker_next_timeout_promiscuous(tracker);
if ((tracker->is_busy() && tracker->latest_event() != Tracker::EVENT_SCRAPE) ||
!tracker->is_usable())
return ~uint32_t();
if ((controller_flags & TrackerController::flag_promiscuous_mode))
return 0;
if ((controller_flags & TrackerController::flag_send_update))
return tracker_next_timeout_update(tracker);
// if (tracker->success_counter() == 0 && tracker->failed_counter() == 0)
// return 0;
int32_t last_activity = cachedTime.seconds() - tracker->activity_time_last();
// TODO: Use min interval if we're requesting manual update.
return tracker->normal_interval() - std::min(last_activity, (int32_t)tracker->normal_interval());
}
uint32_t
tracker_next_timeout_update(Tracker* tracker) {
if ((tracker->is_busy() && tracker->latest_event() != Tracker::EVENT_SCRAPE) ||
!tracker->is_usable())
return ~uint32_t();
// Make sure we don't request _too_ often, check last activity.
// int32_t last_activity = cachedTime.seconds() - tracker->activity_time_last();
return 0;
}
uint32_t
tracker_next_timeout_promiscuous(Tracker* tracker) {
if ((tracker->is_busy() && tracker->latest_event() != Tracker::EVENT_SCRAPE) ||
!tracker->is_usable())
return ~uint32_t();
int32_t interval, use_interval;
int32_t min_interval = std::max(tracker->min_interval(), (uint32_t)300);
if (tracker->failed_counter()) {
interval = 5 << std::min<int>(tracker->failed_counter() - 1, 6);
use_interval = std::min(interval, min_interval);
} else {
interval = tracker->normal_interval();
use_interval = std::max(interval, min_interval);
}
int32_t since_last = cachedTime.seconds() - (int32_t)tracker->activity_time_last();
return std::max(use_interval - since_last, 0);
}
TrackerList::iterator
tracker_find_preferred(TrackerList::iterator first, TrackerList::iterator last, uint32_t* next_timeout) {
TrackerList::iterator preferred = last;
uint32_t preferred_time_last = ~uint32_t();
for (; first != last; first++) {
uint32_t tracker_timeout = tracker_next_timeout_promiscuous(*first);
if (tracker_timeout != 0) {
*next_timeout = std::min(tracker_timeout, *next_timeout);
continue;
}
if ((*first)->activity_time_last() < preferred_time_last) {
preferred = first;
preferred_time_last = (*first)->activity_time_last();
}
}
return preferred;
}
void
TrackerController::do_timeout() {
if (!(m_flags & flag_active) || !m_tracker_list->has_usable())
return;
priority_queue_erase(&taskScheduler, &m_private->task_timeout);
int send_state = current_send_state();
if ((m_flags & (flag_promiscuous_mode | flag_requesting))) {
uint32_t next_timeout = ~uint32_t();
TrackerList::iterator itr = m_tracker_list->begin();
while (itr != m_tracker_list->end()) {
uint32_t group = (*itr)->group();
if (m_tracker_list->has_active_not_scrape_in_group(group)) {
itr = m_tracker_list->end_group(group);
continue;
}
TrackerList::iterator group_end = m_tracker_list->end_group((*itr)->group());
TrackerList::iterator preferred = itr;
if (!(*itr)->is_usable() || (*itr)->failed_counter()) {
// The selected tracker in the group is either disabled or not
// reachable, try the others to find a new one to use.
preferred = tracker_find_preferred(preferred, group_end, &next_timeout);
} else {
uint32_t tracker_timeout = tracker_next_timeout_promiscuous(*preferred);
if (tracker_timeout != 0) {
next_timeout = std::min(tracker_timeout, next_timeout);
preferred = group_end;
}
}
if (preferred != group_end)
m_tracker_list->send_state_itr(preferred, send_state);
itr = group_end;
}
if (next_timeout != ~uint32_t())
update_timeout(next_timeout);
// TODO: Send for start/completed also?
} else {
TrackerList::iterator itr = m_tracker_list->find_next_to_request(m_tracker_list->begin());
if (itr == m_tracker_list->end())
return;
int32_t next_timeout = (*itr)->activity_time_next();
if (next_timeout <= cachedTime.seconds())
m_tracker_list->send_state_itr(itr, send_state);
else
update_timeout(next_timeout - cachedTime.seconds());
}
if (m_slot_timeout)
m_slot_timeout();
}
void
TrackerController::do_scrape() {
TrackerList::iterator itr = m_tracker_list->begin();
while (itr != m_tracker_list->end()) {
uint32_t group = (*itr)->group();
if (m_tracker_list->has_active_in_group(group)) {
itr = m_tracker_list->end_group(group);
continue;
}
TrackerList::iterator group_end = m_tracker_list->end_group((*itr)->group());
while (itr != group_end) {
if ((*itr)->can_scrape() && (*itr)->is_usable()) {
m_tracker_list->send_scrape(*itr);
break;
}
itr++;
}
itr = group_end;
}
}
uint32_t
TrackerController::receive_success(Tracker* tb, TrackerController::address_list* l) {
if (!(m_flags & flag_active))
return m_slot_success(l);
// if (<check if we have multiple trackers to send this event to, before we declare success>) {
m_flags &= ~(mask_send | flag_promiscuous_mode | flag_failure_mode);
// }
// If we still have active trackers, skip the timeout.
// Calculate the next timeout according to a list of in-use
// trackers, with the first timeout as the interval.
if ((m_flags & flag_requesting))
update_timeout(30);
else if (!m_tracker_list->has_active())
// TODO: Instead find the lowest timeout, correct timeout?
update_timeout(tb->normal_interval());
return m_slot_success(l);
}
void
TrackerController::receive_failure(Tracker* tb, const std::string& msg) {
if (!(m_flags & flag_active)) {
m_slot_failure(msg);
return;
}
if (tb == NULL) {
LT_LOG_TRACKER(INFO, "Received failure msg:'%s'.", msg.c_str());
m_slot_failure(msg);
return;
}
if (tb->failed_counter() == 1 && tb->success_counter() > 0)
m_flags |= flag_failure_mode;
do_timeout();
m_slot_failure(msg);
}
void
TrackerController::receive_scrape(Tracker* tb) {
if (!(m_flags & flag_active)) {
return;
}
}
void
TrackerController::receive_tracker_enabled(Tracker* tb) {
// TODO: This won't be needed if we rely only on Tracker::m_enable,
// rather than a virtual function.
if (!m_tracker_list->has_usable())
return;
if ((m_flags & flag_active)) {
if (!m_private->task_timeout.is_queued() && !m_tracker_list->has_active()) {
// TODO: Figure out the proper timeout to use here based on when the
// tracker last connected, etc.
update_timeout(0);
}
}
if (m_slot_tracker_enabled)
m_slot_tracker_enabled(tb);
}
void
TrackerController::receive_tracker_disabled(Tracker* tb) {
if ((m_flags & flag_active) && !m_private->task_timeout.is_queued())
update_timeout(0);
if (m_slot_tracker_disabled)
m_slot_tracker_disabled(tb);
}
}