info.hpp

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#pragma once
 
 
#include <prom/metric_base.hpp>
 
#include <initializer_list>
#include <string_view>
#include <utility>
#include <vector>
 
namespace prom {
 
struct InfoSpec {
    std::string_view name{};
    std::string_view help{};
    Labels labels{};  
    comms::DisplayInfo display{};
};
 
class Info : public MetricBase<Info> {
public:
    Info(const std::string_view name, const std::string_view help)
        : MetricBase(MetricType::Info, name, help) {}
 
    explicit Info(const InfoSpec& spec) : MetricBase(MetricType::Info, spec.name, spec.help) {
        core_->base_labels = spec.labels;
        core_->const_labels = spec.labels;
        core_->base_display = spec.display;
        core_->display = spec.display;
    }
 
    explicit Info(std::shared_ptr<MetricCore> core) : MetricBase(std::move(core)) {}
 
    void set(const std::initializer_list<Label> labels) const noexcept {
        const std::vector<Label> owned(labels);
        emit(owned);
    }
 
    void set(const Labels& labels) const noexcept {
        const auto [adapter, handle] = this->bind();
        adapter->set_info(handle, labels.view());
    }
 
    [[nodiscard]] Info labels(const Labels& dynamic) const noexcept {
        return make_child(dynamic);
    }
 
private:
    void emit(const std::vector<Label>& labels) const noexcept {
        const auto [adapter, handle] = this->bind();
        adapter->set_info(handle, std::span<const Label>(labels));
    }
};
 
}  // namespace prom