CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.27)
 project(aliencat_exporter)
 
-set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD 20)
 
 find_package(prometheus-cpp CONFIG REQUIRED)
 

DataSources/DnsmasqSource.cpp

@@ -3,24 +3,35 @@
 //
 
 #include "DnsmasqSource.h"
+#include <exception>
 #include <sstream>
-#include <ranges>
+#include <iostream>
 
 DnsmasqSource::DnsmasqSource() {
+    _leases.open("/var/lib/misc/dnsmasq.leases");
+    if(_leases.fail()) {
+        throw std::runtime_error("failed to open leases file");
+    }
 }
 
 std::vector<prometheus::Labels> DnsmasqSource::readLeases() {
-    std::ifstream leases("/var/lib/misc/dnsmasq.leases");
-    std::string line;
-    std::vector<prometheus::Labels> result;
-    auto labels = std::array{ "time", "mac", "ip", "host", "id" };
+    _leases.clear();
+    _leases.seekg(0);
 
-    while(std::getline(leases, line)) {
-        prometheus::Labels lineMap;
-        for(const auto [index, item]: std::views::split(line, ' ') | std::views::enumerate) {
-            lineMap[labels[index]] = std::string_view(item);
-        }
-        result.push_back(lineMap);
+    std::string line, time, mac, ip, host, id;
+    std::stringstream ss;
+    std::vector<prometheus::Labels> result;
+
+    while(std::getline(_leases, line)) {
+        ss << line;
+        ss >> time >> mac >> ip >> host >> id;
+        result.push_back({
+            {"time", time},
+            {"mac", mac},
+            {"ip", ip},
+            {"host", host},
+            {"id", id}
+        });
     }
 
     return result;

DataSources/DnsmasqSource.h

@@ -10,6 +10,9 @@
 #include <vector>
 
 class DnsmasqSource {
+private:
+    std::ifstream _leases;
+
 public:
     DnsmasqSource();
     std::vector<prometheus::Labels> readLeases();