chore: remove refs to deprecated io/ioutil

exporter/http_test.go

@@ -2,7 +2,7 @@ package exporter
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math/rand"
 	"net"
 	"net/http"
@@ -373,7 +373,7 @@ func downloadURLWithStatusCode(t *testing.T, u string) (int, string) {
 		t.Fatal(err)
 	}
 	defer resp.Body.Close()
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		t.Fatal(err)
 	}

exporter/pwd_file.go

@@ -2,7 +2,7 @@ package exporter
 
 import (
 	"encoding/json"
-	"io/ioutil"
+	"os"
 
 	log "github.com/sirupsen/logrus"
 )
@@ -12,7 +12,7 @@ func LoadPwdFile(passwordFile string) (map[string]string, error) {
 	res := make(map[string]string)
 
 	log.Debugf("start load password file: %s", passwordFile)
-	bytes, err := ioutil.ReadFile(passwordFile)
+	bytes, err := os.ReadFile(passwordFile)
 	if err != nil {
 		log.Warnf("load password file failed: %s", err)
 		return nil, err

exporter/tls.go

@@ -4,7 +4,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	log "github.com/sirupsen/logrus"
 )
@@ -111,7 +111,7 @@ func LoadKeyPair(certFile, keyFile string) (*tls.Certificate, error) {
 // The file must contain PEM encoded data.
 func LoadCAFile(caFile string) (*x509.CertPool, error) {
 	log.Debugf("Load CA cert file: %s", caFile)
-	pemCerts, err := ioutil.ReadFile(caFile)
+	pemCerts, err := os.ReadFile(caFile)
 	if err != nil {
 		return nil, err
 	}

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"flag"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"runtime"
@@ -140,7 +139,7 @@ func main() {
 		scripts := strings.Split(*scriptPath, ",")
 		ls = make(map[string][]byte, len(scripts))
 		for _, script := range scripts {
-			if ls[script], err = ioutil.ReadFile(script); err != nil {
+			if ls[script], err = os.ReadFile(script); err != nil {
 				log.Fatalf("Error loading script file %s    err: %s", script, err)
 			}
 		}