chore: remove refs to deprecated io/ioutil (#2717)

Signed-off-by: guoguangwu <guoguangwu@magic-shield.com>

common/buf/multi_buffer_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"crypto/rand"
 	"io"
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -120,7 +119,7 @@ func TestMultiBufferReadAllToByte(t *testing.T) {
 		common.Must(err)
 		f.Close()
 
-		cnt, err := ioutil.ReadFile(dat)
+		cnt, err := os.ReadFile(dat)
 		common.Must(err)
 
 		if d := cmp.Diff(buf2, cnt); d != "" {

common/cmdarg/arg.go

@@ -3,7 +3,7 @@ package cmdarg
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
+	"os"
 )
 
 // LoadArg loads one arg, maybe an remote url, or local file path
@@ -18,7 +18,7 @@ func LoadArg(arg string) (out io.Reader, err error) {
 
 // LoadArgToBytes loads one arg to []byte, maybe an remote url, or local file path
 func LoadArgToBytes(arg string) (out []byte, err error) {
-	out, err = ioutil.ReadFile(arg)
+	out, err = os.ReadFile(arg)
 	if err != nil {
 		return
 	}

common/log/logger_test.go

@@ -1,7 +1,6 @@
 package log_test
 
 import (
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -13,7 +12,7 @@ import (
 )
 
 func TestFileLogger(t *testing.T) {
-	f, err := ioutil.TempFile("", "vtest")
+	f, err := os.CreateTemp("", "vtest")
 	common.Must(err)
 	path := f.Name()
 	common.Must(f.Close())

infra/conf/geodata/memconservative/cache.go

@@ -1,7 +1,7 @@
 package memconservative
 
 import (
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"google.golang.org/protobuf/proto"
@@ -53,7 +53,7 @@ func (g GeoIPCache) Unmarshal(filename, code string) (*routercommon.GeoIP, error
 	case errFailedToReadBytes, errFailedToReadExpectedLenBytes,
 		errInvalidGeodataFile, errInvalidGeodataVarintLength:
 		newError("failed to decode geoip file: ", filename, ", fallback to the original ReadFile method")
-		geoipBytes, err = ioutil.ReadFile(asset)
+		geoipBytes, err = os.ReadFile(asset)
 		if err != nil {
 			return nil, err
 		}
@@ -118,7 +118,7 @@ func (g GeoSiteCache) Unmarshal(filename, code string) (*routercommon.GeoSite, e
 	case errFailedToReadBytes, errFailedToReadExpectedLenBytes,
 		errInvalidGeodataFile, errInvalidGeodataVarintLength:
 		newError("failed to decode geoip file: ", filename, ", fallback to the original ReadFile method")
-		geositeBytes, err = ioutil.ReadFile(asset)
+		geositeBytes, err = os.ReadFile(asset)
 		if err != nil {
 			return nil, err
 		}

infra/vprotogen/main.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"go/build"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"os/exec"
@@ -48,7 +47,7 @@ func GetRuntimeEnv(key string) (string, error) {
 	}
 	var data []byte
 	var runtimeEnv string
-	data, readErr := ioutil.ReadFile(file)
+	data, readErr := os.ReadFile(file)
 	if readErr != nil {
 		return "", readErr
 	}

main/commands/helpers/fs.go

@@ -2,7 +2,6 @@ package helpers
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
@@ -10,7 +9,7 @@ import (
 
 // ReadDir finds files according to extensions in the dir
 func ReadDir(dir string, extensions []string) ([]string, error) {
-	confs, err := ioutil.ReadDir(dir)
+	confs, err := os.ReadDir(dir)
 	if err != nil {
 		return nil, err
 	}

main/commands/run.go

@@ -2,7 +2,6 @@ package commands
 
 import (
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/signal"
@@ -113,7 +112,7 @@ func dirExists(file string) bool {
 }
 
 func readConfDir(dirPath string, extension []string) cmdarg.Arg {
-	confs, err := ioutil.ReadDir(dirPath)
+	confs, err := os.ReadDir(dirPath)
 	if err != nil {
 		base.Fatalf("failed to read dir %s: %s", dirPath, err)
 	}