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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
namespace dnsdist::prometheus
{
struct PrometheusMetricDefinition
{
const std::string& name;
const std::string& type;
const std::string& description;
const std::string& customName;
};
}
#ifndef DISABLE_PROMETHEUS
// Metric types for Prometheus
enum class PrometheusMetricType: uint8_t {
counter = 1,
gauge = 2
};
// Keeps additional information about metrics
struct MetricDefinition {
MetricDefinition(PrometheusMetricType _prometheusType, const std::string& _description, const std::string& customName_ = ""): description(_description), customName(customName_), prometheusType(_prometheusType) {
}
MetricDefinition() = default;
// Metric description
std::string description;
// Custom name, if any
std::string customName;
// Metric type for Prometheus
PrometheusMetricType prometheusType{PrometheusMetricType::counter};
};
struct MetricDefinitionStorage {
// Return metric definition by name
bool getMetricDetails(const std::string& metricName, MetricDefinition& metric) const {
const auto& metricDetailsIter = metrics.find(metricName);
if (metricDetailsIter == metrics.end()) {
return false;
}
metric = metricDetailsIter->second;
return true;
};
static bool addMetricDefinition(const dnsdist::prometheus::PrometheusMetricDefinition& def) {
static const std::map<std::string, PrometheusMetricType> namesToTypes = {
{"counter", PrometheusMetricType::counter},
{"gauge", PrometheusMetricType::gauge},
};
auto realtype = namesToTypes.find(def.type);
if (realtype == namesToTypes.end()) {
return false;
}
metrics.emplace(def.name, MetricDefinition{realtype->second, def.description, def.customName});
return true;
}
// Return string representation of Prometheus metric type
std::string getPrometheusStringMetricType(PrometheusMetricType metricType) const {
switch (metricType) {
case PrometheusMetricType::counter:
return "counter";
break;
case PrometheusMetricType::gauge:
return "gauge";
break;
default:
return "";
break;
}
};
static std::map<std::string, MetricDefinition> metrics;
};
#endif /* DISABLE_PROMETHEUS */
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