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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
+
+#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 std::string& name, const std::string& type, const std::string& description, const std::string& customName) {
+ static const std::map<std::string, PrometheusMetricType> namesToTypes = {
+ {"counter", PrometheusMetricType::counter},
+ {"gauge", PrometheusMetricType::gauge},
+ };
+ auto realtype = namesToTypes.find(type);
+ if (realtype == namesToTypes.end()) {
+ return false;
+ }
+ metrics.emplace(name, MetricDefinition{realtype->second, description, 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 */