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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.
*/
#include <regex>
#include "dnsdist-metrics.hh"
#include "dnsdist.hh"
#include "dnsdist-web.hh"
namespace dnsdist::metrics
{
std::optional<std::string> declareCustomMetric(const std::string& name, const std::string& type, const std::string& description, std::optional<std::string> customName)
{
if (!std::regex_match(name, std::regex("^[a-z0-9-]+$"))) {
return std::string("Unable to declare metric '") + std::string(name) + std::string("': invalid name\n");
}
if (type == "counter") {
auto customCounters = g_stats.customCounters.write_lock();
auto itp = customCounters->insert({name, DNSDistStats::MutableCounter()});
if (itp.second) {
g_stats.entries.write_lock()->emplace_back(DNSDistStats::EntryPair{name, &(*customCounters)[name].d_value});
addMetricDefinition(name, "counter", description, customName ? *customName : "");
}
}
else if (type == "gauge") {
auto customGauges = g_stats.customGauges.write_lock();
auto itp = customGauges->insert({name, DNSDistStats::MutableGauge()});
if (itp.second) {
g_stats.entries.write_lock()->emplace_back(DNSDistStats::EntryPair{name, &(*customGauges)[name].d_value});
addMetricDefinition(name, "gauge", description, customName ? *customName : "");
}
}
else {
return std::string("Unable to declare metric: unknown type '") + type + "'";
}
return std::nullopt;
}
std::variant<uint64_t, Error> incrementCustomCounter(const std::string_view& name, uint64_t step)
{
auto customCounters = g_stats.customCounters.read_lock();
auto metric = customCounters->find(name);
if (metric != customCounters->end()) {
if (step) {
metric->second.d_value += step;
return metric->second.d_value.load();
}
return ++(metric->second.d_value);
}
return std::string("Unable to increment custom metric '") + std::string(name) + "': no such metric";
}
std::variant<uint64_t, Error> decrementCustomCounter(const std::string_view& name, uint64_t step)
{
auto customCounters = g_stats.customCounters.read_lock();
auto metric = customCounters->find(name);
if (metric != customCounters->end()) {
if (step) {
metric->second.d_value -= step;
return metric->second.d_value.load();
}
return --(metric->second.d_value);
}
return std::string("Unable to decrement custom metric '") + std::string(name) + "': no such metric";
}
std::variant<double, Error> setCustomGauge(const std::string_view& name, const double value)
{
auto customGauges = g_stats.customGauges.read_lock();
auto metric = customGauges->find(name);
if (metric != customGauges->end()) {
metric->second.d_value = value;
return value;
}
return std::string("Unable to set metric '") + std::string(name) + "': no such metric";
}
std::variant<double, Error> getCustomMetric(const std::string_view& name)
{
{
auto customCounters = g_stats.customCounters.read_lock();
auto counter = customCounters->find(name);
if (counter != customCounters->end()) {
return static_cast<double>(counter->second.d_value.load());
}
}
{
auto customGauges = g_stats.customGauges.read_lock();
auto gauge = customGauges->find(name);
if (gauge != customGauges->end()) {
return gauge->second.d_value.load();
}
}
return std::string("Unable to get metric '") + std::string(name) + "': no such metric";
}
}
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