don't cache transports for incomparable configs

Co-authored-by: Jordan Liggitt <liggitt@google.com>

Kubernetes-commit: 0765ba8e54f0c9e5f221e505a24759fa18beaf2e

transport/cache.go

@@ -47,12 +47,9 @@ type tlsCacheKey struct {
 	keyData            string
 	certFile           string
 	keyFile            string
-	getCert            string
 	serverName         string
 	nextProtos         string
-	dial               string
 	disableCompression bool
-	proxy              string
 }
 
 func (t tlsCacheKey) String() string {
@@ -60,22 +57,24 @@ func (t tlsCacheKey) String() string {
 	if len(t.keyData) > 0 {
 		keyText = "<redacted>"
 	}
-	return fmt.Sprintf("insecure:%v, caData:%#v, certData:%#v, keyData:%s, getCert: %s, serverName:%s, dial:%s disableCompression:%t, proxy: %s", t.insecure, t.caData, t.certData, keyText, t.getCert, t.serverName, t.dial, t.disableCompression, t.proxy)
+	return fmt.Sprintf("insecure:%v, caData:%#v, certData:%#v, keyData:%s, serverName:%s, disableCompression:%t", t.insecure, t.caData, t.certData, keyText, t.serverName, t.disableCompression)
 }
 
 func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
-	key, err := tlsConfigKey(config)
+	key, canCache, err := tlsConfigKey(config)
 	if err != nil {
 		return nil, err
 	}
 
-	// Ensure we only create a single transport for the given TLS options
+	if canCache {
-	c.mu.Lock()
+		// Ensure we only create a single transport for the given TLS options
-	defer c.mu.Unlock()
+		c.mu.Lock()
+		defer c.mu.Unlock()
 
-	// See if we already have a custom transport for this config
+		// See if we already have a custom transport for this config
-	if t, ok := c.transports[key]; ok {
+		if t, ok := c.transports[key]; ok {
-		return t, nil
+			return t, nil
+		}
 	}
 
 	// Get the TLS options for this client config
@@ -110,8 +109,7 @@ func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
 		proxy = config.Proxy
 	}
 
-	// Cache a single transport for these options
+	transport := utilnet.SetTransportDefaults(&http.Transport{
-	c.transports[key] = utilnet.SetTransportDefaults(&http.Transport{
 		Proxy:               proxy,
 		TLSHandshakeTimeout: 10 * time.Second,
 		TLSClientConfig:     tlsConfig,
@@ -119,24 +117,33 @@ func (c *tlsTransportCache) get(config *Config) (http.RoundTripper, error) {
 		DialContext:         dial,
 		DisableCompression:  config.DisableCompression,
 	})
-	return c.transports[key], nil
+
+	if canCache {
+		// Cache a single transport for these options
+		c.transports[key] = transport
+	}
+
+	return transport, nil
 }
 
 // tlsConfigKey returns a unique key for tls.Config objects returned from TLSConfigFor
-func tlsConfigKey(c *Config) (tlsCacheKey, error) {
+func tlsConfigKey(c *Config) (tlsCacheKey, bool, error) {
 	// Make sure ca/key/cert content is loaded
 	if err := loadTLSFiles(c); err != nil {
-		return tlsCacheKey{}, err
+		return tlsCacheKey{}, false, err
 	}
+
+	if c.TLS.GetCert != nil || c.Dial != nil || c.Proxy != nil {
+		// cannot determine equality for functions
+		return tlsCacheKey{}, false, nil
+	}
+
 	k := tlsCacheKey{
 		insecure:           c.TLS.Insecure,
 		caData:             string(c.TLS.CAData),
-		getCert:            fmt.Sprintf("%p", c.TLS.GetCert),
 		serverName:         c.TLS.ServerName,
 		nextProtos:         strings.Join(c.TLS.NextProtos, ","),
-		dial:               fmt.Sprintf("%p", c.Dial),
 		disableCompression: c.DisableCompression,
-		proxy:              fmt.Sprintf("%p", c.Proxy),
 	}
 
 	if c.TLS.ReloadTLSFiles {
@@ -147,5 +154,5 @@ func tlsConfigKey(c *Config) (tlsCacheKey, error) {
 		k.keyData = string(c.TLS.KeyData)
 	}
 
-	return k, nil
+	return k, true, nil
 }

transport/cache_test.go

@@ -21,7 +21,6 @@ import (
 	"crypto/tls"
 	"net"
 	"net/http"
-	"net/url"
 	"testing"
 )
 
@@ -37,16 +36,24 @@ func TestTLSConfigKey(t *testing.T) {
 	}
 	for nameA, valueA := range identicalConfigurations {
 		for nameB, valueB := range identicalConfigurations {
-			keyA, err := tlsConfigKey(valueA)
+			keyA, canCache, err := tlsConfigKey(valueA)
 			if err != nil {
 				t.Errorf("Unexpected error for %q: %v", nameA, err)
 				continue
 			}
-			keyB, err := tlsConfigKey(valueB)
+			if !canCache {
+				t.Errorf("Unexpected canCache=false")
+				continue
+			}
+			keyB, canCache, err := tlsConfigKey(valueB)
 			if err != nil {
 				t.Errorf("Unexpected error for %q: %v", nameB, err)
 				continue
 			}
+			if !canCache {
+				t.Errorf("Unexpected canCache=false")
+				continue
+			}
 			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
@@ -132,12 +139,12 @@ func TestTLSConfigKey(t *testing.T) {
 	}
 	for nameA, valueA := range uniqueConfigurations {
 		for nameB, valueB := range uniqueConfigurations {
-			keyA, err := tlsConfigKey(valueA)
+			keyA, canCacheA, err := tlsConfigKey(valueA)
 			if err != nil {
 				t.Errorf("Unexpected error for %q: %v", nameA, err)
 				continue
 			}
-			keyB, err := tlsConfigKey(valueB)
+			keyB, canCacheB, err := tlsConfigKey(valueB)
 			if err != nil {
 				t.Errorf("Unexpected error for %q: %v", nameB, err)
 				continue
@@ -148,33 +155,18 @@ func TestTLSConfigKey(t *testing.T) {
 				if keyA != keyB {
 					t.Errorf("Expected identical cache keys for %q and %q, got:\n\t%s\n\t%s", nameA, nameB, keyA, keyB)
 				}
+				if canCacheA != canCacheB {
+					t.Errorf("Expected identical canCache %q and %q, got:\n\t%v\n\t%v", nameA, nameB, canCacheA, canCacheB)
+				}
 				continue
 			}
 
-			if keyA == keyB {
+			if canCacheA && canCacheB {
-				t.Errorf("Expected unique cache keys for %q and %q, got:\n\t%s\n\t%s", nameA, nameB, keyA, keyB)
+				if keyA == keyB {
-				continue
+					t.Errorf("Expected unique cache keys for %q and %q, got:\n\t%s\n\t%s", nameA, nameB, keyA, keyB)
+					continue
+				}
 			}
 		}
 	}
 }
-
-func TestTLSConfigKeyFuncPtr(t *testing.T) {
-	keys := make(map[tlsCacheKey]struct{})
-	makeKey := func(p func(*http.Request) (*url.URL, error)) tlsCacheKey {
-		key, err := tlsConfigKey(&Config{Proxy: p})
-		if err != nil {
-			t.Fatalf("Unexpected error creating cache key: %v", err)
-		}
-		return key
-	}
-
-	keys[makeKey(http.ProxyFromEnvironment)] = struct{}{}
-	keys[makeKey(http.ProxyFromEnvironment)] = struct{}{}
-	keys[makeKey(http.ProxyURL(nil))] = struct{}{}
-	keys[makeKey(nil)] = struct{}{}
-
-	if got, want := len(keys), 3; got != want {
-		t.Fatalf("Unexpected number of keys: got=%d want=%d", got, want)
-	}
-}