add uptime()

Author: UlricQin

main_test.go

@@ -98,4 +98,11 @@ func TestMetrics(t *testing.T) {
 	fmt.Println("==============ss -s===============")
 	fmt.Println(SocketStatSummary())
 
+	fmt.Println("=============uptime:==============")
+	days, hours, mins, err := SystemUptime()
+	if err != nil {
+		fmt.Println("error:", err)
+	} else {
+		fmt.Printf("%d days, %d hours, %d mins\n", days, hours, mins)
+	}
 }

system.go

@@ -0,0 +1,38 @@
+package nux
+
+import (
+	"fmt"
+	"github.com/toolkits/file"
+	"strconv"
+	"strings"
+)
+
+func SystemUptime() (days, hours, mins int64, err error) {
+	var content string
+	content, err = file.ToTrimString("/proc/uptime")
+	if err != nil {
+		return
+	}
+
+	fields := strings.Fields(content)
+	if len(fields) < 2 {
+		err = fmt.Errorf("/proc/uptime format not supported")
+		return
+	}
+
+	secStr := fields[0]
+	var secF float64
+	secF, err = strconv.ParseFloat(secStr, 64)
+	if err != nil {
+		return
+	}
+
+	minTotal := secF / 60.0
+	hourTotal := minTotal / 60.0
+
+	days = int64(hourTotal / 24.0)
+	hours = int64(hourTotal) - days*24
+	mins = int64(minTotal) - (days * 60 * 24) - (hours * 60)
+
+	return
+}