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/*
* Copyright (c) 2021 One Identity
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "stats/aggregator/stats-aggregator.h"
#include "stats/stats-registry.h"
#include "stats/stats-cluster-single.h"
#include "mainloop.h"
static void
_restart_timer(StatsAggregator *self)
{
main_loop_assert_main_thread();
if (self->timer_period < 0)
return;
/* NOTE: our timer may still be registered if _restart_timer() is called
* after _reset(): in this case stats_aggregator_start() will find an
* orphaned counter whose timer is still running as the 0 value is caused
* by reset and not by reaching zero due to aggregate.
*
* I hate the orphaned lifecycle model implemented in aggregators: we are
* keeping counters active if they are non-zero (see the _is_orphaned()
* method below). I understand it is nicer that the counter is listed as
* active, but the hoops we needed to jump just for this is insane. We
* should have just kept updating those counters even if the related
* connection is not active at the moment, who would have cared? */
if (iv_timer_registered(&self->update_timer))
return;
iv_validate_now();
self->update_timer.expires = iv_now;
self->update_timer.expires.tv_sec += self->timer_period;
iv_timer_register(&self->update_timer);
}
static void
_stop_timer(StatsAggregator *self)
{
main_loop_assert_main_thread();
if (iv_timer_registered(&self->update_timer))
iv_timer_unregister(&self->update_timer);
}
static void
_timer_callback(void *cookie)
{
StatsAggregator *self = (StatsAggregator *) cookie;
if (!stats_aggregator_is_orphaned(self))
stats_aggregator_aggregate(self);
/* we might become orphaned only after the aggregated value reaches 0 */
if (stats_aggregator_is_orphaned(self))
stats_aggregator_unregister(self);
else
_restart_timer(self);
}
void
stats_aggregator_register(StatsAggregator *self)
{
if (self->register_aggr)
self->register_aggr(self);
_restart_timer(self);
}
void
stats_aggregator_unregister(StatsAggregator *self)
{
if (self->unregister_aggr)
self->unregister_aggr(self);
_stop_timer(self);
}
/* start/stop aggregation */
void
stats_aggregator_start(StatsAggregator *self)
{
main_loop_assert_main_thread();
if (!self)
return;
if (stats_aggregator_is_orphaned(self))
stats_aggregator_register(self);
++self->use_count;
}
void
stats_aggregator_stop(StatsAggregator *self)
{
main_loop_assert_main_thread();
if (!self)
return;
if (self->use_count > 0)
--self->use_count;
if (self->use_count == 0)
stats_aggregator_aggregate(self);
if (stats_aggregator_is_orphaned(self))
stats_aggregator_unregister(self);
}
static gboolean
_is_orphaned(StatsAggregator *self)
{
return self->use_count == 0;
}
static void
_register(StatsAggregator *self)
{
stats_lock();
stats_register_counter(self->stats_level, &self->key, SC_TYPE_SINGLE_VALUE, &self->output_counter);
stats_unlock();
}
static void
_unregister(StatsAggregator *self)
{
stats_lock();
stats_unregister_counter(&self->key, SC_TYPE_SINGLE_VALUE, &self->output_counter);
stats_unlock();
}
static void
_set_virtual_functions(StatsAggregator *self)
{
self->is_orphaned = _is_orphaned;
self->register_aggr = _register;
self->unregister_aggr = _unregister;
}
void
stats_aggregator_init_instance(StatsAggregator *self, StatsClusterKey *sc_key, gint stats_level)
{
self->use_count = 0;
self->stats_level = stats_level;
stats_cluster_key_clone(&self->key, sc_key);
_set_virtual_functions(self);
IV_TIMER_INIT(&self->update_timer);
self->update_timer.cookie = self;
self->update_timer.handler = _timer_callback;
self->timer_period = -1;
}
void
stats_aggregator_free(StatsAggregator *self)
{
stats_cluster_key_cloned_free(&self->key);
if (self && self->free_fn)
self->free_fn(self);
g_free(self);
}
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