chore: remove refs to deprecated io/ioutil (#374)

Signed-off-by: guoguangwu <[email protected]>

Author: testwill

cache/tmp_file_response_writer.go

@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 
@@ -32,7 +31,7 @@ func NewTmpFileResponseWriter(rw http.ResponseWriter, dir string) (*TmpFileRespo
 		return nil, fmt.Errorf("the response writer does not implement http.CloseNotifier")
 	}
 
-	f, err := ioutil.TempFile(dir, "tmp")
+	f, err := os.CreateTemp(dir, "tmp")
 	if err != nil {
 		return nil, fmt.Errorf("cannot create temporary file in %q: %w", dir, err)
 	}

cache/tmp_file_response_writer_test.go

@@ -1,7 +1,7 @@
 package cache
 
 import (
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"os"
@@ -57,7 +57,7 @@ func init() {
 
 func TestFileCreation(t *testing.T) {
 	srw := newFakeResponse()
-	files, _ := ioutil.ReadDir(testTmpWriterDir)
+	files, _ := os.ReadDir(testTmpWriterDir)
 	nbFileBefore := len(files)
 
 	tmpFileRespWriter, err := NewTmpFileResponseWriter(srw, testTmpWriterDir)
@@ -67,7 +67,7 @@ func TestFileCreation(t *testing.T) {
 		return
 	}
 
-	files, _ = ioutil.ReadDir(testTmpWriterDir)
+	files, _ = os.ReadDir(testTmpWriterDir)
 	nbFileAfter := len(files)
 	if nbFileAfter == nbFileBefore {
 		t.Fatalf("Error while creating tmp file")
@@ -77,7 +77,7 @@ func TestFileCreation(t *testing.T) {
 
 func TestFileRemoval(t *testing.T) {
 	srw := newFakeResponse()
-	files, _ := ioutil.ReadDir(testTmpWriterDir)
+	files, _ := os.ReadDir(testTmpWriterDir)
 	nbFileBefore := len(files)
 
 	tmpFileRespWriter, err := NewTmpFileResponseWriter(srw, testTmpWriterDir)
@@ -87,7 +87,7 @@ func TestFileRemoval(t *testing.T) {
 	}
 	tmpFileRespWriter.Close()
 
-	files, _ = ioutil.ReadDir(testTmpWriterDir)
+	files, _ = os.ReadDir(testTmpWriterDir)
 	nbFileAfter := len(files)
 	if nbFileAfter != nbFileBefore {
 		t.Fatalf("Error while deleting tmp file")
@@ -147,7 +147,7 @@ func TestWriteThenReadContent(t *testing.T) {
 		return
 	}
 	tmpFileRespWriter.ResetFileOffset()
-	buffer, err := ioutil.ReadAll(reader)
+	buffer, err := io.ReadAll(reader)
 	if err != nil {
 		t.Fatalf("could not read tmp file:%s", err)
 		return

proxy.go

@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -208,7 +207,7 @@ func executeWithRetry(
 	var since float64
 
 	// keep the request body
-	body, err := ioutil.ReadAll(req.Body)
+	body, err := io.ReadAll(req.Body)
 	req.Body.Close()
 	if err != nil {
 		since = time.Since(startTime).Seconds()
@@ -219,7 +218,7 @@ func executeWithRetry(
 	numRetry := 0
 	for {
 		// update body
-		req.Body = ioutil.NopCloser(bytes.NewBuffer(body))
+		req.Body = io.NopCloser(bytes.NewBuffer(body))
 		req.Body.Close()
 
 		rp(rw, req)

proxyretry_test.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -177,7 +177,7 @@ func (mhs *mockHosts) mockReverseProxy(rw http.ResponseWriter, req *http.Request
 		rw.WriteHeader(http.StatusOK)
 	}
 
-	b, err := ioutil.ReadAll(req.Body)
+	b, err := io.ReadAll(req.Body)
 	if err != nil {
 		mhs.t.Errorf("The req body cannot be read: %v", err)
 	}