113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
|
/*
|
||
|
|
Copyright 2016 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 (
|
||
|
|
"encoding/json"
|
||
|
|
"io"
|
||
|
|
"net/http"
|
||
|
|
"sync"
|
||
|
|
|
||
|
|
"k8s.io/apimachinery/pkg/util/runtime"
|
||
|
|
"k8s.io/kubernetes/pkg/api"
|
||
|
|
)
|
||
|
|
|
||
|
|
// streamProtocolV3 implements version 3 of the streaming protocol for attach
|
||
|
|
// and exec. This version adds support for resizing the container's terminal.
|
||
|
|
type streamProtocolV3 struct {
|
||
|
|
*streamProtocolV2
|
||
|
|
|
||
|
|
resizeStream io.Writer
|
||
|
|
}
|
||
|
|
|
||
|
|
var _ streamProtocolHandler = &streamProtocolV3{}
|
||
|
|
|
||
|
|
func newStreamProtocolV3(options StreamOptions) streamProtocolHandler {
|
||
|
|
return &streamProtocolV3{
|
||
|
|
streamProtocolV2: newStreamProtocolV2(options).(*streamProtocolV2),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *streamProtocolV3) createStreams(conn streamCreator) error {
|
||
|
|
// set up the streams from v2
|
||
|
|
if err := p.streamProtocolV2.createStreams(conn); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// set up resize stream
|
||
|
|
if p.Tty {
|
||
|
|
headers := http.Header{}
|
||
|
|
headers.Set(api.StreamType, api.StreamTypeResize)
|
||
|
|
var err error
|
||
|
|
p.resizeStream, err = conn.CreateStream(headers)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *streamProtocolV3) handleResizes() {
|
||
|
|
if p.resizeStream == nil || p.TerminalSizeQueue == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
defer runtime.HandleCrash()
|
||
|
|
|
||
|
|
encoder := json.NewEncoder(p.resizeStream)
|
||
|
|
for {
|
||
|
|
size := p.TerminalSizeQueue.Next()
|
||
|
|
if size == nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if err := encoder.Encode(&size); err != nil {
|
||
|
|
runtime.HandleError(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *streamProtocolV3) stream(conn streamCreator) error {
|
||
|
|
if err := p.createStreams(conn); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// now that all the streams have been created, proceed with reading & copying
|
||
|
|
|
||
|
|
errorChan := watchErrorStream(p.errorStream, &errorDecoderV3{})
|
||
|
|
|
||
|
|
p.handleResizes()
|
||
|
|
|
||
|
|
p.copyStdin()
|
||
|
|
|
||
|
|
var wg sync.WaitGroup
|
||
|
|
p.copyStdout(&wg)
|
||
|
|
p.copyStderr(&wg)
|
||
|
|
|
||
|
|
// we're waiting for stdout/stderr to finish copying
|
||
|
|
wg.Wait()
|
||
|
|
|
||
|
|
// waits for errorStream to finish reading with an error or nil
|
||
|
|
return <-errorChan
|
||
|
|
}
|
||
|
|
|
||
|
|
type errorDecoderV3 struct {
|
||
|
|
errorDecoderV2
|
||
|
|
}
|