all: replace uses of ioutil with io and os (#24869)

eth/tracers/api.go

@@ -22,7 +22,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"runtime"
 	"sync"
@@ -463,7 +462,7 @@ func (api *API) TraceBlock(ctx context.Context, blob hexutil.Bytes, config *Trac
 // TraceBlockFromFile returns the structured logs created during the execution of
 // EVM and returns them as a JSON object.
 func (api *API) TraceBlockFromFile(ctx context.Context, file string, config *TraceConfig) ([]*txTraceResult, error) {
-	blob, err := ioutil.ReadFile(file)
+	blob, err := os.ReadFile(file)
 	if err != nil {
 		return nil, fmt.Errorf("could not read file: %v", err)
 	}
@@ -722,7 +721,7 @@ func (api *API) standardTraceBlockToFile(ctx context.Context, block *types.Block
 			if !canon {
 				prefix = fmt.Sprintf("%valt-", prefix)
 			}
-			dump, err = ioutil.TempFile(os.TempDir(), prefix)
+			dump, err = os.CreateTemp(os.TempDir(), prefix)
 			if err != nil {
 				return nil, err
 			}

eth/tracers/internal/tracetest/calltrace_test.go

@@ -20,6 +20,7 @@ import (
 	"encoding/json"
 	"io/ioutil"
 	"math/big"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -152,7 +153,7 @@ func testCallTracer(tracerName string, dirPath string, t *testing.T) {
 				tx   = new(types.Transaction)
 			)
 			// Call tracer test found, read if from disk
-			if blob, err := ioutil.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
+			if blob, err := os.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
 				t.Fatalf("failed to read testcase: %v", err)
 			} else if err := json.Unmarshal(blob, test); err != nil {
 				t.Fatalf("failed to parse testcase: %v", err)
@@ -250,7 +251,7 @@ func BenchmarkTracers(b *testing.B) {
 		}
 		file := file // capture range variable
 		b.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(b *testing.B) {
-			blob, err := ioutil.ReadFile(filepath.Join("testdata", "call_tracer", file.Name()))
+			blob, err := os.ReadFile(filepath.Join("testdata", "call_tracer", file.Name()))
 			if err != nil {
 				b.Fatalf("failed to read testcase: %v", err)
 			}