PrometheusServer.cpp

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#include "metrics/PrometheusServer.hpp"
 
#include "Version.h"
 
#include <date/date.h>
#include <prometheus/info.h>
 
#include <limits>
 
PrometheusServer::PrometheusServer(const std::string &serverAddr)
    : _mainExposer(std::make_unique<prometheus::Exposer>(serverAddr, 1))
{
    auto reg = std::make_shared<prometheus::Registry>();
 
    // Basic information
    _infoFamily =
        &prometheus::BuildInfo().Name(PROJECT_NAME).Help(std::string(PROJECT_NAME) + " information").Register(*reg);
 
    _infoFamily->Add({{"init_time", date::format("%FT%TZ", date::floor<std::chrono::nanoseconds>(
                                                               std::chrono::high_resolution_clock::now()))}});
    _infoFamily->Add({{"version", PROJECT_FULL_REVISION}});
 
    _vRegister.emplace_back(std::numeric_limits<uint64_t>::max(), reg);
    _mainExposer->RegisterCollectable(reg);
}
 
std::shared_ptr<prometheus::Registry> PrometheusServer::getRegistry(uint64_t regId)
{
    const std::scoped_lock guard(_guardLock);
 
    if (auto iter = std::find_if(_vRegister.begin(), _vRegister.end(),
                                 [regId](const std::pair<uint64_t, std::shared_ptr<prometheus::Registry>> &val) {
                                     return regId == val.first;
                                 });
        iter != _vRegister.end())
    {
        return iter->second;
    }
    return nullptr;
}
 
std::shared_ptr<prometheus::Registry> PrometheusServer::createNewRegistry()
{
    uint64_t regId = 0;
    return createNewRegistry(regId);
}
 
std::shared_ptr<prometheus::Registry> PrometheusServer::createNewRegistry(uint64_t &regId)
{
    const std::scoped_lock guard(_guardLock);
 
    // Create registry
    auto reg = std::make_shared<prometheus::Registry>();
    _mainExposer->RegisterCollectable(reg);
 
    // Push to vector (At least information registry always exist so back is valid)
    regId = _vRegister.back().first + 1;
    _vRegister.emplace_back(_vRegister.back().first + 1, reg);
    return reg;
}
 
bool PrometheusServer::deleteRegistry(uint64_t regId)
{
    if (regId == std::numeric_limits<uint64_t>::max())
    {
        return false;
    }
 
    const std::scoped_lock guard(_guardLock);
 
    _vRegister.erase(std::remove_if(
        _vRegister.begin(), _vRegister.end(),
        [regId](const std::pair<uint64_t, std::shared_ptr<prometheus::Registry>> &val) { return regId == val.first; }));
 
    return true;
}