初始化提交

mengyamonitor-backend/memory.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"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
+	}
+	return MemoryMetrics{
+		TotalBytes:  total,
+		UsedBytes:   used,
+		FreeBytes:   free,
+		UsedPercent: round(usedPercent, 2),
+	}, nil
+}