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/*
* This file is part of PowerDNS or weakforced.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 3 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include "prometheus/registry.h"
#include "prometheus/text_serializer.h"
#include "prometheus/counter.h"
#include "prometheus/gauge.h"
#include "prometheus/histogram.h"
#include "wforce_ns.hh"
#include "wforce_exception.hh"
#include <string>
using namespace prometheus;
class PrometheusMetrics {
public:
PrometheusMetrics(const std::string& prefix) : d_registry(wforce::make_unique<Registry>()), d_bb{0.001,0.01,0.1,1}, d_prefix(prefix)
{
if (d_registry != nullptr) {
auto& wqd_family = BuildHistogram()
.Name(d_prefix+"_worker_queue_duration_seconds")
.Help("How many seconds do worker threads have to wait to run?")
.Register(*d_registry);
worker_queue_duration = &(wqd_family.Add({}, d_bb));
auto& wrd_family = BuildHistogram()
.Name(d_prefix+"_worker_response_duration_seconds")
.Help("How many seconds do worker threads take to run?")
.Register(*d_registry);
worker_response_duration = &(wrd_family.Add({}, d_bb));
auto& active_conn_family = BuildGauge()
.Name(d_prefix+"_active_http_connections")
.Help("How many active connections to the REST API?")
.Register(*d_registry);
active_connections = &(active_conn_family.Add({}));
auto& web_queue_family = BuildGauge()
.Name(d_prefix+"_web_queue_size")
.Help("How full is the REST API worker thread queue?")
.Register(*d_registry);
web_queue_size = &(web_queue_family.Add({}));
auto& webhook_queue_family = BuildGauge()
.Name(d_prefix+"_webhook_queue_size")
.Help("How full is the webhook worker thread queue?")
.Register(*d_registry);
webhook_queue_size = &(webhook_queue_family.Add({}));
commands_family = &(BuildCounter()
.Name(d_prefix+"_commands_total")
.Help("How many commands have been received?")
.Register(*d_registry));
custom_family = &(BuildCounter()
.Name(d_prefix+"_custom_stats_total")
.Help("Count of custom stats (by type)")
.Register(*d_registry));
dns_query_family = &(BuildCounter()
.Name(d_prefix+"_dns_queries_total")
.Help("How many DNS queries were performed?")
.Register(*d_registry));
dns_query_latency_family = &(BuildHistogram()
.Name(d_prefix+"_dns_query_response_seconds")
.Help("How long do DNS queries take?")
.Register(*d_registry));
webhook_family = &(BuildCounter()
.Name(d_prefix+"_webhook_events_total")
.Help("How many webhook events occurred?")
.Register(*d_registry));
custom_webhook_family = &(BuildCounter()
.Name(d_prefix+"_custom_webhook_events_total")
.Help("How many custom webhook events occurred?")
.Register(*d_registry));
}
else {
throw WforceException("Could not allocate memory for Prometheus Registry");
}
}
virtual ~PrometheusMetrics() = default;
void addCommandMetric(const std::string& name);
void incCommandMetric(const std::string& name);
void addCustomMetric(const std::string& name);
void incCustomMetric(const std::string& name);
void observeWQD(float duration)
{
worker_queue_duration->Observe(duration);
}
void observeWRD(float duration)
{
worker_response_duration->Observe(duration);
}
void setActiveConns(size_t value)
{
active_connections->Set(value);
}
void addDNSResolverMetric(const std::string& name);
void incDNSResolverMetric(const std::string& name);
void observeDNSResolverLatency(const std::string& name, float duration);
void addWebhookMetric(unsigned int id, const std::string& url, bool custom);
void incWebhookMetric(unsigned int id, bool success, bool custom);
void setWebQueueSize(int value)
{
web_queue_size->Set(value);
}
void setWebhookQueueSize(int value)
{
webhook_queue_size->Set(value);
}
virtual std::string serialize()
{
return d_textSerializer.Serialize(d_registry->Collect());
}
private:
Histogram* worker_queue_duration;
Histogram* worker_response_duration;
Gauge* active_connections;
Gauge* web_queue_size;
Gauge* webhook_queue_size;
Family<Counter>* commands_family;
std::map<std::string, Counter*> commands_metrics;
Family<Counter>* custom_family;
std::map<std::string, Counter*> custom_metrics;
Family<Counter>* dns_query_family;
std::map<std::string, Counter*> dns_query_metrics;
Family<Histogram>* dns_query_latency_family;
std::map<std::string, Histogram*> dns_query_latency_metrics;
Family<Counter>* webhook_family;
std::map<std::string, Counter*> webhook_metrics;
Family<Counter>* custom_webhook_family;
std::map<std::string, Counter*> custom_webhook_metrics;
protected:
prometheus::TextSerializer d_textSerializer;
std::unique_ptr<prometheus::Registry> d_registry;
Histogram::BucketBoundaries d_bb;
std::string d_prefix;
};
void initPrometheusMetrics(std::shared_ptr<PrometheusMetrics> pmp);
void setPrometheusActiveConns(size_t value);
void addPrometheusCommandMetric(const std::string& name);
void incPrometheusCommandMetric(const std::string& name);
void addPrometheusCustomMetric(const std::string& name);
void incPrometheusCustomMetric(const std::string& name);
void observePrometheusWQD(float duration);
void observePrometheusWRD(float duration);
void addPrometheusDNSResolverMetric(const std::string& name);
void incPrometheusDNSResolverMetric(const std::string& name);
void observePrometheusDNSResolverLatency(const std::string& name, float duration);
void addPrometheusWebhookMetric(unsigned int id, const std::string& url, bool custom);
void incPrometheusWebhookMetric(unsigned int id, bool success, bool custom);
void setPrometheusWebQueueSize(int value);
void setPrometheusWebhookQueueSize(int value);
std::string serializePrometheusMetrics();
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