metricsbackend.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013-2020 Minetest core developers team
 
#pragma once
#include <memory>
#include <string>
#include <utility>
#include "config.h"
 
class MetricCounter
{
public:
        MetricCounter() = default;
 
        virtual ~MetricCounter() {}
 
        virtual void increment(double number = 1.0) = 0;
        virtual double get() const = 0;
};
 
typedef std::shared_ptr<MetricCounter> MetricCounterPtr;
 
class MetricGauge
{
public:
        MetricGauge() = default;
        virtual ~MetricGauge() {}
 
        virtual void increment(double number = 1.0) = 0;
        virtual void decrement(double number = 1.0) = 0;
        virtual void set(double number) = 0;
        virtual double get() const = 0;
};
 
typedef std::shared_ptr<MetricGauge> MetricGaugePtr;
 
class MetricsBackend
{
public:
        MetricsBackend() = default;
 
        virtual ~MetricsBackend() {}
 
        typedef std::initializer_list<std::pair<const std::string, std::string>> Labels;
 
        virtual MetricCounterPtr addCounter(
                        const std::string &name, const std::string &help_str,
                        Labels labels = {});
        virtual MetricGaugePtr addGauge(
                        const std::string &name, const std::string &help_str,
                        Labels labels = {});
};
 
#if USE_PROMETHEUS
MetricsBackend *createPrometheusMetricsBackend();
#endif