distinguish custom dialers in transport cache

staging/src/k8s.io/client-go/transport/cache.go

@@ -44,6 +44,7 @@ type tlsCacheKey struct {
 	certData   string
 	keyData    string
 	serverName string
+	dial       string
 }
 
 func (t tlsCacheKey) String() string {
@@ -51,7 +52,7 @@ func (t tlsCacheKey) String() string {
 	if len(t.keyData) > 0 {
 		keyText = "<redacted>"
 	}
-	return fmt.Sprintf("insecure:%v, caData:%#v, certData:%#v, keyData:%s, serverName:%s", t.insecure, t.caData, t.certData, keyText, t.serverName)
+	return fmt.Sprintf("insecure:%v, caData:%#v, certData:%#v, keyData:%s, serverName:%s, dial:%s", t.insecure, t.caData, t.certData, keyText, t.serverName, t.dial)
 }
 
 func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
@@ -75,7 +76,7 @@ func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
 		return nil, err
 	}
 	// The options didn't require a custom TLS config
-	if tlsConfig == nil {
+	if tlsConfig == nil && config.Dial == nil {
 		return http.DefaultTransport, nil
 	}
 
@@ -109,5 +110,6 @@ func tlsConfigKey(c *Config) (tlsCacheKey, error) {
 		certData:   string(c.TLS.CertData),
 		keyData:    string(c.TLS.KeyData),
 		serverName: c.TLS.ServerName,
+		dial:       fmt.Sprintf("%p", c.Dial),
 	}, nil
 }

staging/src/k8s.io/client-go/transport/cache_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package transport
 
 import (
+	"net"
 	"net/http"
 	"testing"
 )
@@ -53,6 +54,8 @@ func TestTLSConfigKey(t *testing.T) {
 	// Make sure config fields that affect the tls config affect the cache key
 	uniqueConfigurations := map[string]*Config{
 		"no tls":   {},
+		"dialer":   {Dial: net.Dial},
+		"dialer2":  {Dial: func(network, address string) (net.Conn, error) { return nil, nil }},
 		"insecure": {TLS: TLSConfig{Insecure: true}},
 		"cadata 1": {TLS: TLSConfig{CAData: []byte{1}}},
 		"cadata 2": {TLS: TLSConfig{CAData: []byte{2}}},
@@ -104,11 +107,6 @@ func TestTLSConfigKey(t *testing.T) {
 	}
 	for nameA, valueA := range uniqueConfigurations {
 		for nameB, valueB := range uniqueConfigurations {
-			// Don't compare to ourselves
-			if nameA == nameB {
-				continue
-			}
-
 			keyA, err := tlsConfigKey(valueA)
 			if err != nil {
 				t.Errorf("Unexpected error for %q: %v", nameA, err)
@@ -119,6 +117,15 @@ func TestTLSConfigKey(t *testing.T) {
 				t.Errorf("Unexpected error for %q: %v", nameB, err)
 				continue
 			}
+
+			// Make sure we get the same key on the same config
+			if nameA == nameB {
+				if keyA != keyB {
+					t.Errorf("Expected identical cache keys for %q and %q, got:\n\t%s\n\t%s", nameA, nameB, keyA, keyB)
+				}
+				continue
+			}
+
 			if keyA == keyB {
 				t.Errorf("Expected unique cache keys for %q and %q, got:\n\t%s\n\t%s", nameA, nameB, keyA, keyB)
 				continue