add verification on nil log

Signed-off-by: Benjamin Wang <wachao@vmware.com>

client/pkg/fileutil/fileutil.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"go.etcd.io/etcd/client/pkg/v3/verify"
 	"go.uber.org/zap"
 )
 
@@ -45,6 +46,7 @@ func IsDirWriteable(dir string) error {
 // TouchDirAll is similar to os.MkdirAll. It creates directories with 0700 permission if any directory
 // does not exists. TouchDirAll also ensures the given directory is writable.
 func TouchDirAll(lg *zap.Logger, dir string) error {
+	verify.Assert(lg != nil, "nil log isn't allowed")
 	// If path is already a directory, MkdirAll does nothing and returns nil, so,
 	// first check if dir exists with an expected permission mode.
 	if Exist(dir) {

client/pkg/fileutil/fileutil_test.go

@@ -26,6 +26,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"go.uber.org/zap/zaptest"
 )
 
@@ -218,3 +219,14 @@ func TestRemoveMatchFile(t *testing.T) {
 		t.Errorf("expected error, got nil")
 	}
 }
+
+func TestTouchDirAll(t *testing.T) {
+	tmpdir := t.TempDir()
+	assert.Panics(t, func() {
+		TouchDirAll(nil, tmpdir)
+	}, "expected panic with nil log")
+
+	if err := TouchDirAll(zaptest.NewLogger(t), tmpdir); err != nil {
+		t.Fatal(err)
+	}
+}

client/pkg/transport/listener.go

@@ -34,6 +34,7 @@ import (
 
 	"go.etcd.io/etcd/client/pkg/v3/fileutil"
 	"go.etcd.io/etcd/client/pkg/v3/tlsutil"
+	"go.etcd.io/etcd/client/pkg/v3/verify"
 
 	"go.uber.org/zap"
 )
@@ -196,6 +197,7 @@ func (info TLSInfo) Empty() bool {
 }
 
 func SelfCert(lg *zap.Logger, dirpath string, hosts []string, selfSignedCertValidity uint, additionalUsages ...x509.ExtKeyUsage) (info TLSInfo, err error) {
+	verify.Assert(lg != nil, "nil log isn't allowed")
 	info.Logger = lg
 	if selfSignedCertValidity == 0 {
 		err = fmt.Errorf("selfSignedCertValidity is invalid,it should be greater than 0")

client/pkg/transport/listener_test.go

@@ -24,6 +24,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"go.uber.org/zap/zaptest"
 )
 
@@ -528,6 +529,7 @@ func TestNewListenerUnixSocket(t *testing.T) {
 // TestNewListenerTLSInfoSelfCert tests that a new certificate accepts connections.
 func TestNewListenerTLSInfoSelfCert(t *testing.T) {
 	tmpdir := t.TempDir()
+
 	tlsinfo, err := SelfCert(zaptest.NewLogger(t), tmpdir, []string{"127.0.0.1"}, 1)
 	if err != nil {
 		t.Fatal(err)
@@ -536,6 +538,10 @@ func TestNewListenerTLSInfoSelfCert(t *testing.T) {
 		t.Fatalf("tlsinfo should have certs (%+v)", tlsinfo)
 	}
 	testNewListenerTLSInfoAccept(t, tlsinfo)
+
+	assert.Panics(t, func() {
+		SelfCert(nil, tmpdir, []string{"127.0.0.1"}, 1)
+	}, "expected panic with nil log")
 }
 
 func TestIsClosedConnError(t *testing.T) {