Initial Proxmox dashboard with host and guest metrics

memory.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type MemoryMetrics struct {
+	TotalBytes     uint64  `json:"totalBytes"`
+	UsedBytes      uint64  `json:"usedBytes"`
+	AvailableBytes uint64  `json:"availableBytes"`
+	CachedBytes    uint64  `json:"cachedBytes"`
+	BuffersBytes   uint64  `json:"buffersBytes"`
+	SwapTotalBytes uint64  `json:"swapTotalBytes"`
+	SwapUsedBytes  uint64  `json:"swapUsedBytes"`
+	UsagePercent   float64 `json:"usagePercent"`
+	SwapPercent    float64 `json:"swapPercent"`
+}
+
+func readMemoryMetrics(path string) (MemoryMetrics, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return MemoryMetrics{}, err
+	}
+	defer file.Close()
+
+	values := make(map[string]uint64)
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		fields := strings.Fields(scanner.Text())
+		if len(fields) < 2 {
+			continue
+		}
+		key := strings.TrimSuffix(fields[0], ":")
+		value, err := strconv.ParseUint(fields[1], 10, 64)
+		if err == nil {
+			values[key] = value * 1024
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		return MemoryMetrics{}, err
+	}
+
+	total := values["MemTotal"]
+	available := values["MemAvailable"]
+	if total == 0 {
+		return MemoryMetrics{}, fmt.Errorf("MemTotal не найден в %s", path)
+	}
+	if available > total {
+		available = total
+	}
+	used := total - available
+	swapTotal := values["SwapTotal"]
+	swapFree := values["SwapFree"]
+	if swapFree > swapTotal {
+		swapFree = swapTotal
+	}
+	swapUsed := swapTotal - swapFree
+
+	result := MemoryMetrics{
+		TotalBytes: total, UsedBytes: used, AvailableBytes: available,
+		CachedBytes:  values["Cached"] + values["SReclaimable"],
+		BuffersBytes: values["Buffers"], SwapTotalBytes: swapTotal,
+		SwapUsedBytes: swapUsed, UsagePercent: float64(used) / float64(total) * 100,
+	}
+	if swapTotal > 0 {
+		result.SwapPercent = float64(swapUsed) / float64(swapTotal) * 100
+	}
+	return result, nil
+}