drop io/ioutil

io/ioutil has been deprecated since go1.16.

cmd/id/main.go

@@ -9,7 +9,6 @@ import (
 	"encoding/csv"
 	"flag"
 	"go/format"
-	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -55,7 +54,7 @@ func main() {
 		log.Fatalf("Error formatting code: %v", err)
 	}
 
-	if err := ioutil.WriteFile(*out, bfmt, 0644); err != nil {
+	if err := os.WriteFile(*out, bfmt, 0644); err != nil {
 		log.Fatalf("Error writing %s: %v", *out, err)
 	}
 	log.Printf("Wrote %s", *out)

cmd/service/main.go

@@ -5,8 +5,8 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
+	"os"
 	"os/exec"
 	"path"
 	"strings"
@@ -80,7 +80,7 @@ func write(src []byte, filename string) {
 
 	b.Write(src)
 
-	if err := ioutil.WriteFile(filename, b.Bytes(), 0644); err != nil {
+	if err := os.WriteFile(filename, b.Bytes(), 0644); err != nil {
 		log.Fatalf("Failed to write %s: %v", filename, err)
 	}
 

cmd/status/main.go

@@ -9,7 +9,6 @@ import (
 	"bytes"
 	"flag"
 	"go/format"
-	"io/ioutil"
 	"log"
 	"os"
 	"strings"
@@ -66,7 +65,7 @@ func main() {
 		log.Fatalf("Error formatting source: %v", err)
 	}
 
-	if err := ioutil.WriteFile(*out, bfmt, 0644); err != nil {
+	if err := os.WriteFile(*out, bfmt, 0644); err != nil {
 		log.Fatalf("Error writing %s: %v", *out, err)
 	}
 	log.Printf("Wrote %s", *out)

config.go

@@ -8,10 +8,10 @@ import (
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/pem"
-	"io/ioutil"
 	"log"
 	"math/rand"
 	"net"
+	"os"
 	"strings"
 	"time"
 
@@ -247,7 +247,7 @@ func PrivateKeyFile(filename string) Option {
 }
 
 func loadPrivateKey(filename string) (*rsa.PrivateKey, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, errors.Errorf("Failed to load private key: %s", err)
 	}
@@ -295,7 +295,7 @@ func CertificateFile(filename string) Option {
 }
 
 func loadCertificate(filename string) ([]byte, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, errors.Errorf("Failed to load certificate: %s", err)
 	}

config_test.go

@@ -5,7 +5,6 @@ import (
 	"crypto/tls"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
@@ -130,7 +129,7 @@ func TestOptions(t *testing.T) {
 	randomRequestID = func() uint32 { return 125 }
 	defer func() { randomRequestID = nil }()
 
-	d, err := ioutil.TempDir("", "gopcua")
+	d, err := os.MkdirTemp("", "gopcua")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -153,16 +152,16 @@ func TestOptions(t *testing.T) {
 		}
 	}
 
-	if err := ioutil.WriteFile(certDERFile, certDER, 0644); err != nil {
+	if err := os.WriteFile(certDERFile, certDER, 0644); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(certPEMFile, certPEM, 0644); err != nil {
+	if err := os.WriteFile(certPEMFile, certPEM, 0644); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(keyDERFile, keyDER, 0644); err != nil {
+	if err := os.WriteFile(keyDERFile, keyDER, 0644); err != nil {
 		t.Fatal(err)
 	}
-	if err := ioutil.WriteFile(keyPEMFile, keyPEM, 0644); err != nil {
+	if err := os.WriteFile(keyPEMFile, keyPEM, 0644); err != nil {
 		t.Fatal(err)
 	}
 	defer os.Remove(keyPEMFile)

debug/debug.go

@@ -8,15 +8,15 @@ package debug
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"strings"
 )
 
 // Flags contains the debug flags set by OPC_DEBUG.
 //
-//  * codec : print detailed debugging information when encoding/decoding
+//   - codec : print detailed debugging information when encoding/decoding
 var Flags = os.Getenv("OPC_DEBUG")
 
 // Enable controls whether debug logging is enabled. It is disabled by default.
@@ -29,7 +29,7 @@ var Logger = log.New(os.Stderr, "debug: ", 0)
 // Otherwise, a discarding logger is returned.
 func NewPrefixLogger(format string, args ...interface{}) *log.Logger {
 	if !Enable {
-		return log.New(ioutil.Discard, "", 0)
+		return log.New(io.Discard, "", 0)
 	}
 	return log.New(os.Stderr, "debug: "+fmt.Sprintf(format, args...), 0)
 }