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/*
* Copyright (c) 2023 Attila Szakacs
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, 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., 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 "metrics-probe.h"
#include "metrics/dyn-metrics-template.h"
#include "scratch-buffers.h"
typedef struct _MetricsProbe
{
LogParser super;
LogTemplateOptions template_options;
DynMetricsTemplate *metrics_template;
LogTemplate *increment_template;
} MetricsProbe;
void
metrics_probe_set_increment_template(LogParser *s, LogTemplate *increment_template)
{
MetricsProbe *self = (MetricsProbe *) s;
log_template_unref(self->increment_template);
self->increment_template = log_template_ref(increment_template);
}
LogTemplateOptions *
metrics_probe_get_template_options(LogParser *s)
{
MetricsProbe *self = (MetricsProbe *) s;
return &self->template_options;
}
DynMetricsTemplate *
metrics_probe_get_metrics_template(LogParser *s)
{
MetricsProbe *self = (MetricsProbe *) s;
return self->metrics_template;
}
static const gchar *
_format_increment_template(MetricsProbe *self, LogMessage *msg, GString *buffer)
{
if (log_template_is_trivial(self->increment_template))
{
gssize len;
return log_template_get_trivial_value(self->increment_template, msg, &len);
}
LogTemplateEvalOptions template_eval_options = { &self->template_options, LTZ_SEND, 0, NULL, LM_VT_STRING };
log_template_format(self->increment_template, msg, &template_eval_options, buffer);
return buffer->str;
}
static gssize
_calculate_increment(MetricsProbe *self, LogMessage *msg)
{
if (!self->increment_template)
return 1;
ScratchBuffersMarker marker;
GString *increment_buffer = scratch_buffers_alloc_and_mark(&marker);
const gchar *increment_str = _format_increment_template(self, msg, increment_buffer);
gssize increment = strtoll(increment_str, NULL, 10);
scratch_buffers_reclaim_marked(marker);
return increment;
}
static gboolean
_process(LogParser *s, LogMessage **pmsg, const LogPathOptions *path_options, const gchar *input, gsize input_len)
{
MetricsProbe *self = (MetricsProbe *) s;
msg_trace("metrics-probe message processing started",
evt_tag_str("key", self->metrics_template->key),
evt_tag_msg_reference(*pmsg));
if (!dyn_metrics_template_is_enabled(self->metrics_template))
return TRUE;
StatsCounterItem *counter = dyn_metrics_template_get_stats_counter(self->metrics_template,
&self->template_options, *pmsg);
gssize increment = _calculate_increment(self, *pmsg);
stats_counter_add(counter, increment);
return TRUE;
}
static void
_add_default_label_template(MetricsProbe *self, const gchar *label, const gchar *value_template_str)
{
LogTemplate *value_template = log_template_new(self->super.super.cfg, NULL);
log_template_compile(value_template, value_template_str, NULL);
dyn_metrics_template_add_label_template(self->metrics_template, label, value_template);
log_template_unref(value_template);
}
static gboolean
_init(LogPipe *s)
{
MetricsProbe *self = (MetricsProbe *) s;
GlobalConfig *cfg = log_pipe_get_config(s);
log_template_options_init(&self->template_options, cfg);
if (!self->metrics_template->key && !self->metrics_template->label_templates)
{
dyn_metrics_template_set_key(self->metrics_template, "classified_events_total");
_add_default_label_template(self, "app", "${APP}");
_add_default_label_template(self, "host", "${HOST}");
_add_default_label_template(self, "program", "${PROGRAM}");
_add_default_label_template(self, "source", "${SOURCE}");
}
if (!self->metrics_template->key)
{
msg_error("metrics-probe: Setting key() is mandatory, when not using the default values",
log_pipe_location_tag(s));
return FALSE;
}
if (!dyn_metrics_template_init(self->metrics_template))
return FALSE;
return log_parser_init_method(s);
}
static LogPipe *
_clone(LogPipe *s)
{
MetricsProbe *self = (MetricsProbe *) s;
MetricsProbe *cloned = (MetricsProbe *) metrics_probe_new(s->cfg);
log_parser_clone_settings(&self->super, &cloned->super);
dyn_metrics_template_free(cloned->metrics_template);
cloned->metrics_template = dyn_metrics_template_clone(self->metrics_template, s->cfg);
metrics_probe_set_increment_template(&cloned->super, self->increment_template);
log_template_options_clone(&self->template_options, &cloned->template_options);
return &cloned->super.super;
}
static void
_free(LogPipe *s)
{
MetricsProbe *self = (MetricsProbe *) s;
log_template_unref(self->increment_template);
log_template_options_destroy(&self->template_options);
dyn_metrics_template_free(self->metrics_template);
log_parser_free_method(s);
}
LogParser *
metrics_probe_new(GlobalConfig *cfg)
{
MetricsProbe *self = g_new0(MetricsProbe, 1);
log_parser_init_instance(&self->super, cfg);
self->super.super.init = _init;
self->super.super.free_fn = _free;
self->super.super.clone = _clone;
self->super.process = _process;
self->metrics_template = dyn_metrics_template_new(cfg);
log_template_options_defaults(&self->template_options);
return &self->super;
}
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