Implemented node system statistics

2026-03-21 18:21:09 +00:00
parent ba5e364c05
commit 6d447a0ff9
28 changed files with 1402 additions and 156 deletions
--- a/MoonlightServers.Daemon/Helpers/SystemMetrics.Memory.cs
+++ b/MoonlightServers.Daemon/Helpers/SystemMetrics.Memory.cs
@@ -0,0 +1,59 @@
+namespace MoonlightServers.Daemon.Helpers;
+
+public partial class SystemMetrics
+{
+    /// <summary>Memory figures derived from <c>/proc/meminfo</c>.</summary>
+    /// <param name="TotalBytes">Physical RAM installed.</param>
+    /// <param name="UsedBytes">RAM actively in use (<c>Total - Available</c>).</param>
+    /// <param name="FreeBytes">Completely unallocated RAM.</param>
+    /// <param name="CachedBytes">Page cache + reclaimable slab — matches the <c>cached</c> column in <c>free -h</c>.</param>
+    /// <param name="BuffersBytes">Kernel I/O buffer memory.</param>
+    /// <param name="AvailableBytes">Estimated RAM available for new allocations without swapping.</param>
+    /// <param name="UsedPercent">UsedBytes / TotalBytes as a percentage (0–100).</param>
+    public record MemoryInfo(
+        long TotalBytes,
+        long UsedBytes,
+        long FreeBytes,
+        long CachedBytes,
+        long BuffersBytes,
+        long AvailableBytes,
+        double UsedPercent
+    );
+    
+    // Memory  —  /proc/meminfo
+
+    /// <summary>
+    /// Parses <c>/proc/meminfo</c> into a <see cref="MemoryInfo"/> record.
+    /// The <c>CachedBytes</c> field is computed as
+    /// <c>Cached + SReclaimable - Shmem</c> to match the value shown by <c>free -h</c>.
+    /// </summary>
+    private static async Task<MemoryInfo> ReadMemoryAsync()
+    {
+        var lines = await File.ReadAllLinesAsync("/proc/meminfo");
+        var map = new Dictionary<string, long>(StringComparer.Ordinal);
+
+        foreach (var line in lines)
+        {
+            var colon = line.IndexOf(':');
+            if (colon < 0)
+                continue;
+
+            var key = line[..colon].Trim();
+            var val = line[(colon + 1)..].Trim().Split(' ')[0]; // Strip "kB" suffix.
+            if (long.TryParse(val, out var kb))
+                map[key] = kb * 1024L;
+        }
+
+        var total = map.GetValueOrDefault("MemTotal");
+        var available = map.GetValueOrDefault("MemAvailable");
+        var free = map.GetValueOrDefault("MemFree");
+        var buffers = map.GetValueOrDefault("Buffers");
+        var cached = map.GetValueOrDefault("Cached")
+                     + map.GetValueOrDefault("SReclaimable")
+                     - map.GetValueOrDefault("Shmem");
+        var used = total - available;
+        var usedPct = total > 0 ? Math.Round((double)used / total * 100.0, 2) : 0.0;
+
+        return new MemoryInfo(total, used, free, cached, buffers, available, usedPct);
+    }
+}