pdns/dnsdistdist/dnsdist-prometheus.hh

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #pragma once
  23
  24 // Metric types for Prometheus
  25 enum class PrometheusMetricType: int {
  26     counter = 1,
  27     gauge = 2
  28 };
  29
  30 // Keeps additional information about metrics
  31 struct MetricDefinition {
  32   MetricDefinition(PrometheusMetricType _prometheusType, const std::string& _description): description(_description), prometheusType(_prometheusType) {
  33   }
  34
  35   MetricDefinition() = default;
  36
  37   // Metric description
  38   std::string description;
  39   // Metric type for Prometheus
  40   PrometheusMetricType prometheusType;
  41 };
  42
  43 struct MetricDefinitionStorage {
  44   // Return metric definition by name
  45   bool getMetricDetails(const std::string& metricName, MetricDefinition& metric) const {
  46     const auto& metricDetailsIter = metrics.find(metricName);
  47
  48     if (metricDetailsIter == metrics.end()) {
  49       return false;
  50     }
  51
  52     metric = metricDetailsIter->second;
  53     return true;
  54   };
  55
  56   // Return string representation of Prometheus metric type
  57   std::string getPrometheusStringMetricType(PrometheusMetricType metricType) const {
  58     switch (metricType) {
  59       case PrometheusMetricType::counter:
  60         return "counter";
  61         break;
  62       case PrometheusMetricType::gauge:
  63         return "gauge";
  64         break;
  65       default:
  66         return "";
  67         break;
  68     }
  69   };
  70
  71   static const std::map<std::string, MetricDefinition> metrics;
  72 };