MetricBase.hpp

#pragma once
 
#include "util/prometheus/OStream.hpp"
 
#include <string>
 
namespace util::prometheus {

class MetricBase {
public:
    MetricBase(std::string name, std::string labelsString);
 
    MetricBase(MetricBase const&) = delete;
    MetricBase(MetricBase&&) = default;
    MetricBase&
    operator=(MetricBase const&) = delete;
    MetricBase&
    operator=(MetricBase&&) = default;
    virtual ~MetricBase() = default;

    friend OStream&
    operator<<(OStream& stream, MetricBase const& metricBase);

    std::string const&
    name() const;

    std::string const&
    labelsString() const;
 
protected:
    virtual void
    serializeValue(OStream& stream) const = 0;
 
private:
    std::string name_;
    std::string labelsString_;
};
 
enum class MetricType {
    CounterInt,
    CounterDouble,
    GaugeInt,
    GaugeDouble,
    HistogramInt,
    HistogramDouble,
    Summary
};
 
char const*
toString(MetricType type);
 
}  // namespace util::prometheus