Remove ioutil (#1096)

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

Author: inosato

api/prometheus/v1/api_test.go

@@ -17,7 +17,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"math"
 	"net/http"
 	"net/http/httptest"
@@ -1680,7 +1680,7 @@ func (c *httpTestClient) Do(ctx context.Context, req *http.Request) (*http.Respo
 	var body []byte
 	done := make(chan struct{})
 	go func() {
-		body, err = ioutil.ReadAll(resp.Body)
+		body, err = io.ReadAll(resp.Body)
 		close(done)
 	}()
 

prometheus/process_collector.go

@@ -16,7 +16,6 @@ package prometheus
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
@@ -152,7 +151,7 @@ func (c *processCollector) reportError(ch chan<- Metric, desc *Desc, err error)
 // It is meant to be used for the PidFn field in ProcessCollectorOpts.
 func NewPidFileFn(pidFilePath string) func() (int, error) {
 	return func() (int, error) {
-		content, err := ioutil.ReadFile(pidFilePath)
+		content, err := os.ReadFile(pidFilePath)
 		if err != nil {
 			return 0, fmt.Errorf("can't read pid file %q: %+v", pidFilePath, err)
 		}

prometheus/push/push.go

@@ -40,7 +40,7 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -245,7 +245,7 @@ func (p *Pusher) Delete() error {
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusAccepted {
-		body, _ := ioutil.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
+		body, _ := io.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
 		return fmt.Errorf("unexpected status code %d while deleting %s: %s", resp.StatusCode, p.fullURL(), body)
 	}
 	return nil
@@ -297,7 +297,7 @@ func (p *Pusher) push(ctx context.Context, method string) error {
 	defer resp.Body.Close()
 	// Depending on version and configuration of the PGW, StatusOK or StatusAccepted may be returned.
 	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusAccepted {
-		body, _ := ioutil.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
+		body, _ := io.ReadAll(resp.Body) // Ignore any further error as this is for an error message only.
 		return fmt.Errorf("unexpected status code %d while pushing to %s: %s", resp.StatusCode, p.fullURL(), body)
 	}
 	return nil

prometheus/push/push_test.go

@@ -15,7 +15,7 @@ package push
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -38,7 +38,7 @@ func TestPush(t *testing.T) {
 		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			lastMethod = r.Method
 			var err error
-			lastBody, err = ioutil.ReadAll(r.Body)
+			lastBody, err = io.ReadAll(r.Body)
 			if err != nil {
 				t.Fatal(err)
 			}

prometheus/registry.go

@@ -16,7 +16,6 @@ package prometheus
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -563,7 +562,7 @@ func (r *Registry) Gather() ([]*dto.MetricFamily, error) {
 // This is intended for use with the textfile collector of the node exporter.
 // Note that the node exporter expects the filename to be suffixed with ".prom".
 func WriteToTextfile(filename string, g Gatherer) error {
-	tmp, err := ioutil.TempFile(filepath.Dir(filename), filepath.Base(filename))
+	tmp, err := os.CreateTemp(filepath.Dir(filename), filepath.Base(filename))
 	if err != nil {
 		return err
 	}

prometheus/registry_test.go

@@ -23,7 +23,6 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
@@ -1066,7 +1065,7 @@ test_summary_count{name="foo"} 2
 	gauge.With(prometheus.Labels{"name": "baz"}).Set(1.1)
 	counter.With(prometheus.Labels{"name": "qux"}).Inc()
 
-	tmpfile, err := ioutil.TempFile("", "prom_registry_test")
+	tmpfile, err := os.CreateTemp("", "prom_registry_test")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1076,7 +1075,7 @@ test_summary_count{name="foo"} 2
 		t.Fatal(err)
 	}
 
-	fileBytes, err := ioutil.ReadFile(tmpfile.Name())
+	fileBytes, err := os.ReadFile(tmpfile.Name())
 	if err != nil {
 		t.Fatal(err)
 	}