assert RoundTripperWrapper interface

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

@@ -92,6 +92,8 @@ type authProxyRoundTripper struct {
 	rt http.RoundTripper
 }
 
+var _ utilnet.RoundTripperWrapper = &authProxyRoundTripper{}
+
 // NewAuthProxyRoundTripper provides a roundtripper which will add auth proxy fields to requests for
 // authentication terminating proxy cases
 // assuming you pull the user from the context:
@@ -150,6 +152,8 @@ type userAgentRoundTripper struct {
 	rt    http.RoundTripper
 }
 
+var _ utilnet.RoundTripperWrapper = &userAgentRoundTripper{}
+
 // NewUserAgentRoundTripper will add User-Agent header to a request unless it has already been set.
 func NewUserAgentRoundTripper(agent string, rt http.RoundTripper) http.RoundTripper {
 	return &userAgentRoundTripper{agent, rt}
@@ -176,6 +180,8 @@ type basicAuthRoundTripper struct {
 	rt       http.RoundTripper
 }
 
+var _ utilnet.RoundTripperWrapper = &basicAuthRoundTripper{}
+
 // NewBasicAuthRoundTripper will apply a BASIC auth authorization header to a
 // request unless it has already been set.
 func NewBasicAuthRoundTripper(username, password string, rt http.RoundTripper) http.RoundTripper {
@@ -225,6 +231,8 @@ type impersonatingRoundTripper struct {
 	delegate    http.RoundTripper
 }
 
+var _ utilnet.RoundTripperWrapper = &impersonatingRoundTripper{}
+
 // NewImpersonatingRoundTripper will add an Act-As header to a request unless it has already been set.
 func NewImpersonatingRoundTripper(impersonate ImpersonationConfig, delegate http.RoundTripper) http.RoundTripper {
 	return &impersonatingRoundTripper{impersonate, delegate}
@@ -264,6 +272,8 @@ type bearerAuthRoundTripper struct {
 	rt     http.RoundTripper
 }
 
+var _ utilnet.RoundTripperWrapper = &bearerAuthRoundTripper{}
+
 // NewBearerAuthRoundTripper adds the provided bearer token to a request
 // unless the authorization header has already been set.
 func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTripper {
@@ -373,6 +383,8 @@ type debuggingRoundTripper struct {
 	levels                map[DebugLevel]bool
 }
 
+var _ utilnet.RoundTripperWrapper = &debuggingRoundTripper{}
+
 // DebugLevel is used to enable debugging of certain
 // HTTP requests and responses fields via the debuggingRoundTripper.
 type DebugLevel int

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

@@ -26,6 +26,7 @@ import (
 
 	"golang.org/x/oauth2"
 
+	utilnet "k8s.io/apimachinery/pkg/util/net"
 	"k8s.io/klog/v2"
 )
 
@@ -95,6 +96,8 @@ type tokenSourceTransport struct {
 	src  ResettableTokenSource
 }
 
+var _ utilnet.RoundTripperWrapper = &tokenSourceTransport{}
+
 func (tst *tokenSourceTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	// This is to allow --token to override other bearer token providers.
 	if req.Header.Get("Authorization") != "" {