migrate away from deprecated ioutil APIs (#7175)

Co-authored-by: Callum Waters <cmwaters19@gmail.com>
Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

types/genesis.go

@@ -5,7 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"time"
 
 	"github.com/tendermint/tendermint/crypto"
@@ -51,7 +51,7 @@ func (genDoc *GenesisDoc) SaveAs(file string) error {
 		return err
 	}
 
-	return ioutil.WriteFile(file, genDocBytes, 0644) // nolint:gosec
+	return os.WriteFile(file, genDocBytes, 0644) // nolint:gosec
 }
 
 // ValidatorHash returns the hash of the validator set contained in the GenesisDoc
@@ -125,7 +125,7 @@ func GenesisDocFromJSON(jsonBlob []byte) (*GenesisDoc, error) {
 
 // GenesisDocFromFile reads JSON data from a file and unmarshalls it into a GenesisDoc.
 func GenesisDocFromFile(genDocFile string) (*GenesisDoc, error) {
-	jsonBlob, err := ioutil.ReadFile(genDocFile)
+	jsonBlob, err := os.ReadFile(genDocFile)
 	if err != nil {
 		return nil, fmt.Errorf("couldn't read GenesisDoc file: %w", err)
 	}

types/genesis_test.go

@@ -1,7 +1,6 @@
 package types
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -122,7 +121,7 @@ func TestGenesisGood(t *testing.T) {
 }
 
 func TestGenesisSaveAs(t *testing.T) {
-	tmpfile, err := ioutil.TempFile("", "genesis")
+	tmpfile, err := os.CreateTemp("", "genesis")
 	require.NoError(t, err)
 	defer os.Remove(tmpfile.Name())
 

types/node_key.go

@@ -1,7 +1,7 @@
 package types
 
 import (
-	"io/ioutil"
+	"os"
 
 	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/ed25519"
@@ -33,7 +33,7 @@ func (nodeKey NodeKey) SaveAs(filePath string) error {
 	if err != nil {
 		return err
 	}
-	return ioutil.WriteFile(filePath, jsonBytes, 0600)
+	return os.WriteFile(filePath, jsonBytes, 0600)
 }
 
 // LoadOrGenNodeKey attempts to load the NodeKey from the given filePath. If
@@ -67,7 +67,7 @@ func GenNodeKey() NodeKey {
 
 // LoadNodeKey loads NodeKey located in filePath.
 func LoadNodeKey(filePath string) (NodeKey, error) {
-	jsonBytes, err := ioutil.ReadFile(filePath)
+	jsonBytes, err := os.ReadFile(filePath)
 	if err != nil {
 		return NodeKey{}, err
 	}

types/part_set_test.go

@@ -1,7 +1,7 @@
 package types
 
 import (
-	"io/ioutil"
+	"io"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -57,7 +57,7 @@ func TestBasicPartSet(t *testing.T) {
 
 	// Reconstruct data, assert that they are equal.
 	data2Reader := partSet2.GetReader()
-	data2, err := ioutil.ReadAll(data2Reader)
+	data2, err := io.ReadAll(data2Reader)
 	require.NoError(t, err)
 
 	assert.Equal(t, data, data2)