refactor: move from io/ioutil to io and os packages (#5266)

The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit
replaces the existing io/ioutil functions with their new definitions in
io and os packages.

[1]: https://golang.org/doc/go1.16#ioutil
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/kapis/cluster/v1alpha1/handler.go

@@ -22,7 +22,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"strings"
@@ -423,10 +422,10 @@ func validateKubeSphereAPIServer(config *rest.Config) (*version.Info, error) {
 	}
 	defer response.Body.Close()
 
-	responseBytes, _ := ioutil.ReadAll(response.Body)
+	responseBytes, _ := io.ReadAll(response.Body)
 	responseBody := string(responseBytes)
 
-	response.Body = ioutil.NopCloser(bytes.NewBuffer(responseBytes))
+	response.Body = io.NopCloser(bytes.NewBuffer(responseBytes))
 
 	if response.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("invalid response: %s , please make sure %s.%s.svc of member cluster is up and running", KubeSphereApiServer, constants.KubeSphereNamespace, responseBody)

pkg/kapis/monitoring/v1alpha3/handler.go

@@ -21,7 +21,7 @@ package v1alpha3
 import (
 	"context"
 	"errors"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -364,7 +364,7 @@ func (h handler) handleGrafanaDashboardImport(req *restful.Request, resp *restfu
 
 			defer r.Body.Close()
 
-			c, err := ioutil.ReadAll(r.Body)
+			c, err := io.ReadAll(r.Body)
 			if err != nil {
 				return nil, err
 			}

pkg/kapis/network/v1alpha2/handler.go

@@ -18,7 +18,7 @@ package v1alpha2
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 
@@ -54,7 +54,7 @@ func (h *handler) getNamespaceTopology(request *restful.Request, response *restf
 		return
 	}
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 	if err != nil {
 		klog.Errorf("read response error : %v", err)
@@ -86,7 +86,7 @@ func (h *handler) getNamespaceNodeTopology(request *restful.Request, response *r
 		return
 	}
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 	if err != nil {
 		klog.Errorf("read response error : %v", err)

pkg/kapis/notification/v2beta2/handler.go

@@ -16,7 +16,7 @@
 package v2beta2
 
 import (
-	"io/ioutil"
+	"io"
 
 	"github.com/emicklei/go-restful"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -131,7 +131,7 @@ func (h *handler) PatchResource(req *restful.Request, resp *restful.Response) {
 		return
 	}
 
-	data, err := ioutil.ReadAll(req.Request.Body)
+	data, err := io.ReadAll(req.Request.Body)
 	if err != nil {
 		api.HandleBadRequest(resp, req, err)
 		return

pkg/kapis/openpitrix/v1/handler.go

@@ -16,7 +16,7 @@ package v1
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math"
 	"net/url"
 	"strconv"
@@ -987,7 +987,7 @@ func (h *openpitrixHandler) CreateAttachment(req *restful.Request, resp *restful
 			api.HandleBadRequest(resp, nil, err)
 			return
 		}
-		data, _ := ioutil.ReadAll(f)
+		data, _ := io.ReadAll(f)
 		f.Close()
 
 		att, err = h.openpitrix.CreateAttachment(data)

pkg/kapis/servicemesh/metrics/v1alpha2/handler.go

@@ -20,7 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 
 	"github.com/emicklei/go-restful"
@@ -172,7 +172,7 @@ func (h *Handler) getData(response *restful.Response, url string) {
 		return
 	}
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 
 	if err != nil {
@@ -202,7 +202,7 @@ func (h *Handler) getJaegerData(response *restful.Response, url string) {
 		return
 	}
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 
 	if err != nil {