update ioutil and rand pkg

pkg/config/misc.go

@@ -18,7 +18,7 @@
 package config
 
 import (
-	"io/ioutil"
+	"os"
 	"path/filepath"
 )
 
@@ -35,7 +35,7 @@ import (
 
 // LoadBootOptions loads BootOptions from specified file path.
 func LoadBootOptions(path string) (*BootOptions, error) {
-	content, err := ioutil.ReadFile(path)
+	content, err := os.ReadFile(path)
 	if err != nil {
 		err = errors.Wrap(err, "failed to load config")
 		return nil, err

pkg/mysql/utils.go

@@ -1227,7 +1227,7 @@ func strconvErr(err error) error {
 // RandomBuf return random salt, seed must be in the range of ascii
 func RandomBuf(size int) ([]byte, error) {
 	buf := make([]byte, size)
-	rand.Seed(time.Now().UTC().UnixNano())
+	rand.New(rand.NewSource(time.Now().UTC().UnixNano()))
 	min, max := 30, 127
 	for i := 0; i < size; i++ {
 		buf[i] = byte(min + rand.Intn(max-min))

pkg/runtime/function/cast_char.go

@@ -20,7 +20,7 @@ package function
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
+	"io"
 	"strings"
 	"unicode/utf8"
 )
@@ -187,7 +187,7 @@ func (a castcharFunc) getResult(runes []rune, num int64, charEncode string) (str
 		// UTF-16 bigendian, no-bom
 		trans := transform.NewReader(srcReader,
 			unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM).NewEncoder())
-		dstString, err := ioutil.ReadAll(trans)
+		dstString, err := io.ReadAll(trans)
 		if err == nil {
 			return string(dstString), nil
 		} else {

pkg/selector/weight_random.go

@@ -35,7 +35,7 @@ type weightRandom struct {
 }
 
 func init() {
-	rand.Seed(time.Now().UnixNano())
+	rand.New(rand.NewSource(time.Now().UnixNano()))
 }
 
 func (w weightRandom) GetDataSourceNo() int {

pkg/util/charsetconv/charsetconv.go

@@ -23,7 +23,7 @@ package charsetconv
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"strings"
 )
 
@@ -99,7 +99,7 @@ func GetCharset(charset string) (Charset, error) {
 
 func transformString(t transform.Transformer, s string) (string, error) {
 	r := transform.NewReader(strings.NewReader(s), t)
-	b, err := ioutil.ReadAll(r)
+	b, err := io.ReadAll(r)
 	return string(b), err
 }
 

pkg/util/rand2/rand2.go

@@ -94,15 +94,15 @@ func GetSeed() int64 {
 }
 
 func init() {
-	rand.Seed(GetSeed())
+	rand.New(rand.NewSource(GetSeed()))
 }
 
 var (
 	// See math/rand for documentation.
 	New = rand.New
 
 	// See math/rand for documentation.
-	Seed = rand.Seed
+	Seed = rand.New
 
 	// See math/rand for documentation.
 	Int63 = rand.Int63