Improve ResourceLocation API, allow proxy to use authenticated transport

pkg/client/kubelet.go

@@ -40,6 +40,7 @@ type KubeletClient interface {
 	KubeletHealthChecker
 	PodInfoGetter
 	NodeInfoGetter
+	ConnectionInfoGetter
 }
 
 // KubeletHealthchecker is an interface for healthchecking kubelets
@@ -59,6 +60,10 @@ type NodeInfoGetter interface {
 	GetNodeInfo(host string) (api.NodeInfo, error)
 }
 
+type ConnectionInfoGetter interface {
+	GetConnectionInfo(host string) (scheme string, port uint, transport http.RoundTripper, error error)
+}
+
 // HTTPKubeletClient is the default implementation of PodInfoGetter and KubeletHealthchecker, accesses the kubelet over HTTP.
 type HTTPKubeletClient struct {
 	Client      *http.Client
@@ -92,6 +97,14 @@ func NewKubeletClient(config *KubeletConfig) (KubeletClient, error) {
 	}, nil
 }
 
+func (c *HTTPKubeletClient) GetConnectionInfo(host string) (string, uint, http.RoundTripper, error) {
+	scheme := "http"
+	if c.EnableHttps {
+		scheme = "https"
+	}
+	return scheme, c.Port, c.Client.Transport, nil
+}
+
 func (c *HTTPKubeletClient) url(host, path, query string) string {
 	scheme := "http"
 	if c.EnableHttps {
@@ -168,3 +181,7 @@ func (c FakeKubeletClient) GetNodeInfo(host string) (api.NodeInfo, error) {
 func (c FakeKubeletClient) HealthCheck(host string) (probe.Result, error) {
 	return probe.Unknown, errors.New("Not Implemented")
 }
+
+func (c FakeKubeletClient) GetConnectionInfo(host string) (string, uint, http.RoundTripper, error) {
+	return "", 0, nil, errors.New("Not Implemented")
+}