*: update kube vendor to v1.7.4

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/k8s.io/client-go/tools/remotecommand/remotecommand.go

@@ -0,0 +1,178 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package remotecommand
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+
+	"github.com/golang/glog"
+
+	"k8s.io/apimachinery/pkg/util/httpstream"
+	"k8s.io/apimachinery/pkg/util/httpstream/spdy"
+	"k8s.io/apimachinery/pkg/util/remotecommand"
+	restclient "k8s.io/client-go/rest"
+	"k8s.io/client-go/transport"
+)
+
+// StreamOptions holds information pertaining to the current streaming session: supported stream
+// protocols, input/output streams, if the client is requesting a TTY, and a terminal size queue to
+// support terminal resizing.
+type StreamOptions struct {
+	SupportedProtocols []string
+	Stdin              io.Reader
+	Stdout             io.Writer
+	Stderr             io.Writer
+	Tty                bool
+	TerminalSizeQueue  TerminalSizeQueue
+}
+
+// Executor is an interface for transporting shell-style streams.
+type Executor interface {
+	// Stream initiates the transport of the standard shell streams. It will transport any
+	// non-nil stream to a remote system, and return an error if a problem occurs. If tty
+	// is set, the stderr stream is not used (raw TTY manages stdout and stderr over the
+	// stdout stream).
+	Stream(options StreamOptions) error
+}
+
+// StreamExecutor supports the ability to dial an httpstream connection and the ability to
+// run a command line stream protocol over that dialer.
+type StreamExecutor interface {
+	Executor
+	httpstream.Dialer
+}
+
+// streamExecutor handles transporting standard shell streams over an httpstream connection.
+type streamExecutor struct {
+	upgrader  httpstream.UpgradeRoundTripper
+	transport http.RoundTripper
+
+	method string
+	url    *url.URL
+}
+
+// NewExecutor connects to the provided server and upgrades the connection to
+// multiplexed bidirectional streams. The current implementation uses SPDY,
+// but this could be replaced with HTTP/2 once it's available, or something else.
+// TODO: the common code between this and portforward could be abstracted.
+func NewExecutor(config *restclient.Config, method string, url *url.URL) (StreamExecutor, error) {
+	tlsConfig, err := restclient.TLSConfigFor(config)
+	if err != nil {
+		return nil, err
+	}
+
+	upgradeRoundTripper := spdy.NewRoundTripper(tlsConfig, true)
+	wrapper, err := restclient.HTTPWrappersForConfig(config, upgradeRoundTripper)
+	if err != nil {
+		return nil, err
+	}
+
+	return &streamExecutor{
+		upgrader:  upgradeRoundTripper,
+		transport: wrapper,
+		method:    method,
+		url:       url,
+	}, nil
+}
+
+// NewStreamExecutor upgrades the request so that it supports multiplexed bidirectional
+// streams. This method takes a stream upgrader and an optional function that is invoked
+// to wrap the round tripper. This method may be used by clients that are lower level than
+// Kubernetes clients or need to provide their own upgrade round tripper.
+func NewStreamExecutor(upgrader httpstream.UpgradeRoundTripper, fn func(http.RoundTripper) http.RoundTripper, method string, url *url.URL) (StreamExecutor, error) {
+	rt := http.RoundTripper(upgrader)
+	if fn != nil {
+		rt = fn(rt)
+	}
+	return &streamExecutor{
+		upgrader:  upgrader,
+		transport: rt,
+		method:    method,
+		url:       url,
+	}, nil
+}
+
+// Dial opens a connection to a remote server and attempts to negotiate a SPDY
+// connection. Upon success, it returns the connection and the protocol
+// selected by the server.
+func (e *streamExecutor) Dial(protocols ...string) (httpstream.Connection, string, error) {
+	rt := transport.DebugWrappers(e.transport)
+
+	// TODO the client probably shouldn't be created here, as it doesn't allow
+	// flexibility to allow callers to configure it.
+	client := &http.Client{Transport: rt}
+
+	req, err := http.NewRequest(e.method, e.url.String(), nil)
+	if err != nil {
+		return nil, "", fmt.Errorf("error creating request: %v", err)
+	}
+	for i := range protocols {
+		req.Header.Add(httpstream.HeaderProtocolVersion, protocols[i])
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, "", fmt.Errorf("error sending request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	conn, err := e.upgrader.NewConnection(resp)
+	if err != nil {
+		return nil, "", err
+	}
+
+	return conn, resp.Header.Get(httpstream.HeaderProtocolVersion), nil
+}
+
+type streamCreator interface {
+	CreateStream(headers http.Header) (httpstream.Stream, error)
+}
+
+type streamProtocolHandler interface {
+	stream(conn streamCreator) error
+}
+
+// Stream opens a protocol streamer to the server and streams until a client closes
+// the connection or the server disconnects.
+func (e *streamExecutor) Stream(options StreamOptions) error {
+	conn, protocol, err := e.Dial(options.SupportedProtocols...)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	var streamer streamProtocolHandler
+
+	switch protocol {
+	case remotecommand.StreamProtocolV4Name:
+		streamer = newStreamProtocolV4(options)
+	case remotecommand.StreamProtocolV3Name:
+		streamer = newStreamProtocolV3(options)
+	case remotecommand.StreamProtocolV2Name:
+		streamer = newStreamProtocolV2(options)
+	case "":
+		glog.V(4).Infof("The server did not negotiate a streaming protocol version. Falling back to %s", remotecommand.StreamProtocolV1Name)
+		fallthrough
+	case remotecommand.StreamProtocolV1Name:
+		streamer = newStreamProtocolV1(options)
+	}
+
+	return streamer.stream(conn)
+}