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/*
* Copyright (c) 2023 László Várady <laszlo.varady93@gmail.com>
*
* 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 "healthcheck.h"
#include "atomic.h"
#include "mainloop-io-worker.h"
#include "stopwatch.h"
struct _HealthCheck
{
GAtomicCounter ref_cnt;
gboolean running;
HealthCheckResult result;
HealthCheckCompletionCB completion;
gpointer user_data;
struct
{
MainLoopIOWorkerJob job;
Stopwatch stopwatch;
} io_worker_latency;
};
static void
healthcheck_incomplete(HealthCheck *self)
{
self->running = FALSE;
self->completion = NULL;
self->user_data = NULL;
healthcheck_unref(self);
}
static void
healthcheck_complete(HealthCheck *self)
{
self->running = FALSE;
self->completion(self->result, self->user_data);
self->completion = NULL;
self->user_data = NULL;
healthcheck_unref(self);
}
static inline gboolean
_start_io_worker_latency(HealthCheck *self)
{
stopwatch_start(&self->io_worker_latency.stopwatch);
if (!main_loop_io_worker_job_submit(&self->io_worker_latency.job, NULL))
{
/* currently, the IO worker check is our only health check */
healthcheck_incomplete(self);
return FALSE;
}
return TRUE;
}
static gboolean
_start_health_checks(HealthCheck *self)
{
g_assert(!self->running);
self->running = TRUE;
return _start_io_worker_latency(self);
}
gboolean
healthcheck_run(HealthCheck *self, HealthCheckCompletionCB completion, gpointer user_data)
{
if (self->running || !completion)
return FALSE;
self->completion = completion;
self->user_data = user_data;
self->result = (HealthCheckResult)
{
0
};
healthcheck_ref(self);
return _start_health_checks(self);
}
static void
_io_worker_latency(gpointer s, gpointer arg)
{
HealthCheck *self = (HealthCheck *) s;
self->result.io_worker_latency = stopwatch_get_elapsed_nsec(&self->io_worker_latency.stopwatch);
}
static void
_io_worker_latency_finished(gpointer s, gpointer arg)
{
HealthCheck *self = (HealthCheck *) s;
self->result.mainloop_io_worker_roundtrip_latency = stopwatch_get_elapsed_nsec(&self->io_worker_latency.stopwatch);
/* currently, the IO worker check is our only health check */
healthcheck_complete(self);
}
static void
healthcheck_free(HealthCheck *self)
{
g_assert(!self->running);
g_free(self);
}
HealthCheck *
healthcheck_ref(HealthCheck *self)
{
if (!self)
return NULL;
g_atomic_counter_inc(&self->ref_cnt);
return self;
}
void
healthcheck_unref(HealthCheck *self)
{
if (!self)
return;
if (g_atomic_counter_dec_and_test(&self->ref_cnt))
healthcheck_free(self);
}
HealthCheck *
healthcheck_new(void)
{
HealthCheck *self = g_new0(HealthCheck, 1);
g_atomic_counter_set(&self->ref_cnt, 1);
self->running = FALSE;
main_loop_io_worker_job_init(&self->io_worker_latency.job);
self->io_worker_latency.job.user_data = self;
self->io_worker_latency.job.work = _io_worker_latency;
self->io_worker_latency.job.completion = _io_worker_latency_finished;
self->io_worker_latency.job.engage = (void (*)(gpointer)) healthcheck_ref;
self->io_worker_latency.job.release = (void (*)(gpointer)) healthcheck_unref;
return self;
}
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