-

internal/hoststats/memory_linux.go

@@ -0,0 +1,46 @@
+//go:build linux
+
+package hoststats
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func readMemory(context.Context) (Memory, error) {
+	f, err := os.Open("/proc/meminfo")
+	if err != nil {
+		return Memory{}, err
+	}
+	defer f.Close()
+	var total, available int64
+	s := bufio.NewScanner(f)
+	for s.Scan() {
+		fields := strings.Fields(s.Text())
+		if len(fields) < 2 {
+			continue
+		}
+		v, _ := strconv.ParseInt(fields[1], 10, 64)
+		switch strings.TrimSuffix(fields[0], ":") {
+		case "MemTotal":
+			total = v * 1024
+		case "MemAvailable":
+			available = v * 1024
+		}
+	}
+	if err := s.Err(); err != nil {
+		return Memory{}, err
+	}
+	if total <= 0 {
+		return Memory{}, fmt.Errorf("MemTotal unavailable")
+	}
+	used := total - available
+	if used < 0 {
+		used = 0
+	}
+	return Memory{TotalBytes: total, UsedBytes: used}, nil
+}