Corrects ioutil pkg usage

Author: ackleymi

_test/test-server/main.go

@@ -3,7 +3,7 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"os/signal"
@@ -92,7 +92,7 @@ func copyMessage(msg *quickfix.Message) *quickfix.Message {
 
 func main() {
 	app := &EchoApplication{}
-	app.log = log.New(ioutil.Discard, "", log.LstdFlags)
+	app.log = log.New(io.Discard, "", log.LstdFlags)
 	//app.log = log.New(os.Stdout, "", log.LstdFlags)
 
 	router.AddRoute(quickfix.BeginStringFIX40, "D", app.processMsg)

filestore.go

@@ -18,7 +18,6 @@ package quickfix
 import (
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path"
 	"strconv"
@@ -205,23 +204,23 @@ func (store *fileStore) populateCache() (creationTimePopulated bool, err error)
 		}
 	}
 
-	if timeBytes, err := ioutil.ReadFile(store.sessionFname); err == nil {
+	if timeBytes, err := os.ReadFile(store.sessionFname); err == nil {
 		var ctime time.Time
 		if err := ctime.UnmarshalText(timeBytes); err == nil {
 			store.cache.creationTime = ctime
 			creationTimePopulated = true
 		}
 	}
 
-	if senderSeqNumBytes, err := ioutil.ReadFile(store.senderSeqNumsFname); err == nil {
+	if senderSeqNumBytes, err := os.ReadFile(store.senderSeqNumsFname); err == nil {
 		if senderSeqNum, err := strconv.Atoi(strings.Trim(string(senderSeqNumBytes), "\r\n")); err == nil {
 			if err = store.cache.SetNextSenderMsgSeqNum(senderSeqNum); err != nil {
 				return creationTimePopulated, errors.Wrap(err, "cache set next sender")
 			}
 		}
 	}
 
-	if targetSeqNumBytes, err := ioutil.ReadFile(store.targetSeqNumsFname); err == nil {
+	if targetSeqNumBytes, err := os.ReadFile(store.targetSeqNumsFname); err == nil {
 		if targetSeqNum, err := strconv.Atoi(strings.Trim(string(targetSeqNumBytes), "\r\n")); err == nil {
 			if err = store.cache.SetNextTargetMsgSeqNum(targetSeqNum); err != nil {
 				return creationTimePopulated, errors.Wrap(err, "cache set next target")

sqlstore_test.go

@@ -18,7 +18,6 @@ package quickfix
 import (
 	"database/sql"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -50,7 +49,7 @@ func (suite *SQLStoreTestSuite) SetupTest() {
 	ddlFnames, err := filepath.Glob(fmt.Sprintf("_sql/%s/*.sql", sqlDriver))
 	require.Nil(suite.T(), err)
 	for _, fname := range ddlFnames {
-		sqlBytes, err := ioutil.ReadFile(fname)
+		sqlBytes, err := os.ReadFile(fname)
 		require.Nil(suite.T(), err)
 		_, err = db.Exec(string(sqlBytes))
 		require.Nil(suite.T(), err)

tls.go

@@ -19,7 +19,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"fmt"
-	"io/ioutil"
+	"os"
 
 	"github.com/quickfixgo/quickfix/config"
 )
@@ -95,7 +95,7 @@ func loadTLSConfig(settings *SessionSettings) (tlsConfig *tls.Config, err error)
 		return
 	}
 
-	pem, err := ioutil.ReadFile(caFile)
+	pem, err := os.ReadFile(caFile)
 	if err != nil {
 		return
 	}