use math/rand/v2 for go1.22+

helper/rand.go

@@ -0,0 +1,20 @@
+// Copyright 2024 xgfone
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package helper
+
+import "math/rand"
+
+// IntN is the alias of the function "math/rand.Intn" or "math/rand/v2.IntN".
+var IntN = rand.Intn

helper/rand_go1.22.go

@@ -0,0 +1,22 @@
+// Copyright 2024 xgfone
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build go1.22
+// +build go1.22
+
+package helper
+
+import "math/rand/v2"
+
+func init() { IntN = rand.IntN }

helper/strings.go

@@ -14,10 +14,7 @@
 
 package helper
 
-import (
-	"math/rand"
-	"unsafe"
-)
+import "unsafe"
 
 // Pre-define some charsets to generate the random string.
 var (
@@ -48,7 +45,7 @@ func RandomString(n int, charset string) string {
 func Random(buf []byte, charset string) {
 	nlen := len(charset)
 	for i, _len := 0, len(buf); i < _len; i++ {
-		buf[i] = charset[rand.Intn(nlen)]
+		buf[i] = charset[IntN(nlen)]
 	}
 }