chore: sync local updates

mengyamonitor-backend-client/memory.go

@@ -0,0 +1,127 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// readMemory 读取内存信息
+func readMemory() (MemoryMetrics, error) {
+	totals := map[string]uint64{}
+	f, err := os.Open("/proc/meminfo")
+	if err != nil {
+		return MemoryMetrics{}, err
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		line := scanner.Text()
+		parts := strings.Split(line, ":")
+		if len(parts) < 2 {
+			continue
+		}
+		key := strings.TrimSpace(parts[0])
+		fields := strings.Fields(strings.TrimSpace(parts[1]))
+		if len(fields) == 0 {
+			continue
+		}
+		value, err := strconv.ParseUint(fields[0], 10, 64)
+		if err != nil {
+			continue
+		}
+		totals[key] = value * 1024 // kB to bytes
+	}
+	total := totals["MemTotal"]
+
+	// 优先使用 MemAvailable（Linux 3.14+），如果没有则计算
+	var free uint64
+	if available, ok := totals["MemAvailable"]; ok && available > 0 {
+		free = available
+	} else {
+		// 回退到 MemFree + Buffers + Cached（适用于较老的系统）
+		free = totals["MemFree"]
+		if buffers, ok := totals["Buffers"]; ok {
+			free += buffers
+		}
+		if cached, ok := totals["Cached"]; ok {
+			free += cached
+		}
+	}
+
+	used := total - free
+	usedPercent := 0.0
+	if total > 0 {
+		usedPercent = (float64(used) / float64(total)) * 100
+	}
+
+	swapTotal := totals["SwapTotal"]
+	swapFree := totals["SwapFree"]
+	swapUsed := uint64(0)
+	if swapTotal >= swapFree {
+		swapUsed = swapTotal - swapFree
+	}
+	swapUsedPct := 0.0
+	if swapTotal > 0 {
+		swapUsedPct = (float64(swapUsed) / float64(swapTotal)) * 100
+	}
+	swapType := summarizeSwapTypes(swapTotal)
+
+	return MemoryMetrics{
+		TotalBytes:      total,
+		UsedBytes:       used,
+		FreeBytes:       free,
+		UsedPercent:     round(usedPercent, 2),
+		SwapTotalBytes:  swapTotal,
+		SwapUsedBytes:   swapUsed,
+		SwapFreeBytes:   swapFree,
+		SwapUsedPercent: round(swapUsedPct, 2),
+		SwapType:        swapType,
+	}, nil
+}
+
+// summarizeSwapTypes 根据 /proc/swaps 汇总交换区类型（file / partition / zram 等）；无 swap 时为「无」
+func summarizeSwapTypes(swapTotalFromMeminfo uint64) string {
+	if swapTotalFromMeminfo == 0 {
+		return "无"
+	}
+	f, err := os.Open("/proc/swaps")
+	if err != nil {
+		return "未知"
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+	lineNum := 0
+	seen := map[string]struct{}{}
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		lineNum++
+		if lineNum == 1 || line == "" {
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+		filename := fields[0]
+		typ := fields[1]
+		if strings.Contains(strings.ToLower(filename), "zram") {
+			typ = "zram"
+		}
+		seen[typ] = struct{}{}
+	}
+	if len(seen) == 0 {
+		if swapTotalFromMeminfo > 0 {
+			return "未知"
+		}
+		return "无"
+	}
+	list := make([]string, 0, len(seen))
+	for t := range seen {
+		list = append(list, t)
+	}
+	sort.Strings(list)
+	return strings.Join(list, " + ")
+}