Adding upstream version 1.8.3.upstream/1.8.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 117 insertions, 0 deletions

diff --git a/dnsdist-metrics.cc b/dnsdist-metrics.cc
new file mode 100644
index 0000000..5de4bfc
--- /dev/null
+++ b/dnsdist-metrics.cc
@@ -0,0 +1,117 @@
+/*
+ * 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";
+}
+}