Code optimization

lib/common/util.go

@@ -13,10 +13,8 @@ import (
 	"net/http"
 	"os"
 	"regexp"
-	"sort"
 	"strconv"
 	"strings"
-	"sync"
 )
 
 //Get the corresponding IP address through domain name
@@ -346,12 +344,3 @@ func BytesToNum(b []byte) int {
 	x, _ := strconv.Atoi(str)
 	return int(x)
 }
-
-func GetMapKeys(m sync.Map) (keys []int) {
-	m.Range(func(key, value interface{}) bool {
-		keys = append(keys, key.(int))
-		return true
-	})
-	sort.Ints(keys)
-	return
-}