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/*
Minetest
Copyright (C) 2013-2020 Minetest core developers team
This program 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 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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.
*/
#include "metricsbackend.h"
#include "util/thread.h"
#if USE_PROMETHEUS
#include <prometheus/exposer.h>
#include <prometheus/registry.h>
#include <prometheus/counter.h>
#include <prometheus/gauge.h>
#include "log.h"
#include "settings.h"
#endif
/* Plain implementation */
class SimpleMetricCounter : public MetricCounter
{
public:
SimpleMetricCounter() : MetricCounter(), m_counter(0.0) {}
virtual ~SimpleMetricCounter() {}
void increment(double number) override
{
MutexAutoLock lock(m_mutex);
m_counter += number;
}
double get() const override
{
MutexAutoLock lock(m_mutex);
return m_counter;
}
private:
mutable std::mutex m_mutex;
double m_counter;
};
class SimpleMetricGauge : public MetricGauge
{
public:
SimpleMetricGauge() : MetricGauge(), m_gauge(0.0) {}
virtual ~SimpleMetricGauge() {}
void increment(double number) override
{
MutexAutoLock lock(m_mutex);
m_gauge += number;
}
void decrement(double number) override
{
MutexAutoLock lock(m_mutex);
m_gauge -= number;
}
void set(double number) override
{
MutexAutoLock lock(m_mutex);
m_gauge = number;
}
double get() const override
{
MutexAutoLock lock(m_mutex);
return m_gauge;
}
private:
mutable std::mutex m_mutex;
double m_gauge;
};
MetricCounterPtr MetricsBackend::addCounter(
const std::string &name, const std::string &help_str, Labels labels)
{
return std::make_shared<SimpleMetricCounter>();
}
MetricGaugePtr MetricsBackend::addGauge(
const std::string &name, const std::string &help_str, Labels labels)
{
return std::make_shared<SimpleMetricGauge>();
}
/* Prometheus backend */
#if USE_PROMETHEUS
class PrometheusMetricCounter : public MetricCounter
{
public:
PrometheusMetricCounter() = delete;
PrometheusMetricCounter(const std::string &name, const std::string &help_str,
MetricsBackend::Labels labels,
std::shared_ptr<prometheus::Registry> registry) :
MetricCounter(),
m_family(prometheus::BuildCounter()
.Name(name)
.Help(help_str)
.Register(*registry)),
m_counter(m_family.Add(labels))
{
}
virtual ~PrometheusMetricCounter() {}
virtual void increment(double number) { m_counter.Increment(number); }
virtual double get() const { return m_counter.Value(); }
private:
prometheus::Family<prometheus::Counter> &m_family;
prometheus::Counter &m_counter;
};
class PrometheusMetricGauge : public MetricGauge
{
public:
PrometheusMetricGauge() = delete;
PrometheusMetricGauge(const std::string &name, const std::string &help_str,
MetricsBackend::Labels labels,
std::shared_ptr<prometheus::Registry> registry) :
MetricGauge(),
m_family(prometheus::BuildGauge()
.Name(name)
.Help(help_str)
.Register(*registry)),
m_gauge(m_family.Add(labels))
{
}
virtual ~PrometheusMetricGauge() {}
virtual void increment(double number) { m_gauge.Increment(number); }
virtual void decrement(double number) { m_gauge.Decrement(number); }
virtual void set(double number) { m_gauge.Set(number); }
virtual double get() const { return m_gauge.Value(); }
private:
prometheus::Family<prometheus::Gauge> &m_family;
prometheus::Gauge &m_gauge;
};
class PrometheusMetricsBackend : public MetricsBackend
{
public:
PrometheusMetricsBackend(const std::string &addr) :
MetricsBackend(), m_exposer(std::make_unique<prometheus::Exposer>(addr)),
m_registry(std::make_shared<prometheus::Registry>())
{
m_exposer->RegisterCollectable(m_registry);
}
virtual ~PrometheusMetricsBackend() {}
MetricCounterPtr addCounter(
const std::string &name, const std::string &help_str,
Labels labels = {}) override;
MetricGaugePtr addGauge(
const std::string &name, const std::string &help_str,
Labels labels = {}) override;
private:
std::unique_ptr<prometheus::Exposer> m_exposer;
std::shared_ptr<prometheus::Registry> m_registry;
};
MetricCounterPtr PrometheusMetricsBackend::addCounter(
const std::string &name, const std::string &help_str, Labels labels)
{
return std::make_shared<PrometheusMetricCounter>(name, help_str, labels, m_registry);
}
MetricGaugePtr PrometheusMetricsBackend::addGauge(
const std::string &name, const std::string &help_str, Labels labels)
{
return std::make_shared<PrometheusMetricGauge>(name, help_str, labels, m_registry);
}
MetricsBackend *createPrometheusMetricsBackend()
{
std::string addr;
g_settings->getNoEx("prometheus_listener_address", addr);
return new PrometheusMetricsBackend(addr);
}
#endif
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