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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
#include <string>
#include <map>
// Metric types for Prometheus
enum class PrometheusMetricType : uint8_t
{
counter,
gauge,
histogram,
multicounter
};
// Keeps additional information about metrics
struct MetricDefinition
{
MetricDefinition(const PrometheusMetricType prometheusType, const std::string& description) :
d_description(description), d_prometheusType(prometheusType)
{
}
MetricDefinition() = default;
// Metric description
std::string d_description;
// Metric type for Prometheus
PrometheusMetricType d_prometheusType;
};
class MetricDefinitionStorage
{
public:
// Return metric definition by name
bool getMetricDetails(const std::string& metricName, MetricDefinition& metric)
{
auto metricDetailsIter = d_metrics.find(metricName);
if (metricDetailsIter == d_metrics.end()) {
return false;
}
metric = metricDetailsIter->second;
return true;
};
// Return string representation of Prometheus metric type
static std::string getPrometheusStringMetricType(const PrometheusMetricType metricType)
{
switch (metricType) {
case PrometheusMetricType::counter:
return "counter";
break;
case PrometheusMetricType::gauge:
return "gauge";
break;
case PrometheusMetricType::histogram:
return "histogram";
break;
case PrometheusMetricType::multicounter:
// A multicounter produces multiple values of type "counter"
return "counter";
break;
default:
return "";
break;
}
};
private:
// Description and types for prometheus output of stats
static const std::map<std::string, MetricDefinition> d_metrics;
};
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