3 Copyright (C) 2013-2020 Minetest core developers team
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include "metricsbackend.h"
22 #include <prometheus/exposer.h>
23 #include <prometheus/registry.h>
24 #include <prometheus/counter.h>
25 #include <prometheus/gauge.h>
30 MetricCounterPtr MetricsBackend::addCounter(
31 const std::string &name, const std::string &help_str)
33 return std::make_shared<SimpleMetricCounter>(name, help_str);
36 MetricGaugePtr MetricsBackend::addGauge(
37 const std::string &name, const std::string &help_str)
39 return std::make_shared<SimpleMetricGauge>(name, help_str);
44 class PrometheusMetricCounter : public MetricCounter
47 PrometheusMetricCounter() = delete;
49 PrometheusMetricCounter(const std::string &name, const std::string &help_str,
50 std::shared_ptr<prometheus::Registry> registry) :
52 m_family(prometheus::BuildCounter()
55 .Register(*registry)),
56 m_counter(m_family.Add({}))
60 virtual ~PrometheusMetricCounter() {}
62 virtual void increment(double number) { m_counter.Increment(number); }
63 virtual double get() const { return m_counter.Value(); }
66 prometheus::Family<prometheus::Counter> &m_family;
67 prometheus::Counter &m_counter;
70 class PrometheusMetricGauge : public MetricGauge
73 PrometheusMetricGauge() = delete;
75 PrometheusMetricGauge(const std::string &name, const std::string &help_str,
76 std::shared_ptr<prometheus::Registry> registry) :
78 m_family(prometheus::BuildGauge()
81 .Register(*registry)),
82 m_gauge(m_family.Add({}))
86 virtual ~PrometheusMetricGauge() {}
88 virtual void increment(double number) { m_gauge.Increment(number); }
89 virtual void decrement(double number) { m_gauge.Decrement(number); }
90 virtual void set(double number) { m_gauge.Set(number); }
91 virtual double get() const { return m_gauge.Value(); }
94 prometheus::Family<prometheus::Gauge> &m_family;
95 prometheus::Gauge &m_gauge;
98 class PrometheusMetricsBackend : public MetricsBackend
101 PrometheusMetricsBackend(const std::string &addr) :
102 MetricsBackend(), m_exposer(std::unique_ptr<prometheus::Exposer>(
103 new prometheus::Exposer(addr))),
104 m_registry(std::make_shared<prometheus::Registry>())
106 m_exposer->RegisterCollectable(m_registry);
109 virtual ~PrometheusMetricsBackend() {}
111 virtual MetricCounterPtr addCounter(
112 const std::string &name, const std::string &help_str);
113 virtual MetricGaugePtr addGauge(
114 const std::string &name, const std::string &help_str);
117 std::unique_ptr<prometheus::Exposer> m_exposer;
118 std::shared_ptr<prometheus::Registry> m_registry;
121 MetricCounterPtr PrometheusMetricsBackend::addCounter(
122 const std::string &name, const std::string &help_str)
124 return std::make_shared<PrometheusMetricCounter>(name, help_str, m_registry);
127 MetricGaugePtr PrometheusMetricsBackend::addGauge(
128 const std::string &name, const std::string &help_str)
130 return std::make_shared<PrometheusMetricGauge>(name, help_str, m_registry);
133 MetricsBackend *createPrometheusMetricsBackend()
136 g_settings->getNoEx("prometheus_listener_address", addr);
137 return new PrometheusMetricsBackend(addr);