mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-05 20:50:24 +00:00
196 lines
5.1 KiB
Go
196 lines
5.1 KiB
Go
|
/*
|
||
|
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"
|
||
|
"io/ioutil"
|
||
|
"net/http"
|
||
|
"sync"
|
||
|
|
||
|
"k8s.io/api/core/v1"
|
||
|
"k8s.io/apimachinery/pkg/util/runtime"
|
||
|
)
|
||
|
|
||
|
// streamProtocolV2 implements version 2 of the streaming protocol for attach
|
||
|
// and exec. The original streaming protocol was metav1. As a result, this
|
||
|
// version is referred to as version 2, even though it is the first actual
|
||
|
// numbered version.
|
||
|
type streamProtocolV2 struct {
|
||
|
StreamOptions
|
||
|
|
||
|
errorStream io.Reader
|
||
|
remoteStdin io.ReadWriteCloser
|
||
|
remoteStdout io.Reader
|
||
|
remoteStderr io.Reader
|
||
|
}
|
||
|
|
||
|
var _ streamProtocolHandler = &streamProtocolV2{}
|
||
|
|
||
|
func newStreamProtocolV2(options StreamOptions) streamProtocolHandler {
|
||
|
return &streamProtocolV2{
|
||
|
StreamOptions: options,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (p *streamProtocolV2) createStreams(conn streamCreator) error {
|
||
|
var err error
|
||
|
headers := http.Header{}
|
||
|
|
||
|
// set up error stream
|
||
|
headers.Set(v1.StreamType, v1.StreamTypeError)
|
||
|
p.errorStream, err = conn.CreateStream(headers)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
|
||
|
// set up stdin stream
|
||
|
if p.Stdin != nil {
|
||
|
headers.Set(v1.StreamType, v1.StreamTypeStdin)
|
||
|
p.remoteStdin, err = conn.CreateStream(headers)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// set up stdout stream
|
||
|
if p.Stdout != nil {
|
||
|
headers.Set(v1.StreamType, v1.StreamTypeStdout)
|
||
|
p.remoteStdout, err = conn.CreateStream(headers)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// set up stderr stream
|
||
|
if p.Stderr != nil && !p.Tty {
|
||
|
headers.Set(v1.StreamType, v1.StreamTypeStderr)
|
||
|
p.remoteStderr, err = conn.CreateStream(headers)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
}
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (p *streamProtocolV2) copyStdin() {
|
||
|
if p.Stdin != nil {
|
||
|
var once sync.Once
|
||
|
|
||
|
// copy from client's stdin to container's stdin
|
||
|
go func() {
|
||
|
defer runtime.HandleCrash()
|
||
|
|
||
|
// if p.stdin is noninteractive, p.g. `echo abc | kubectl exec -i <pod> -- cat`, make sure
|
||
|
// we close remoteStdin as soon as the copy from p.stdin to remoteStdin finishes. Otherwise
|
||
|
// the executed command will remain running.
|
||
|
defer once.Do(func() { p.remoteStdin.Close() })
|
||
|
|
||
|
if _, err := io.Copy(p.remoteStdin, readerWrapper{p.Stdin}); err != nil {
|
||
|
runtime.HandleError(err)
|
||
|
}
|
||
|
}()
|
||
|
|
||
|
// read from remoteStdin until the stream is closed. this is essential to
|
||
|
// be able to exit interactive sessions cleanly and not leak goroutines or
|
||
|
// hang the client's terminal.
|
||
|
//
|
||
|
// TODO we aren't using go-dockerclient any more; revisit this to determine if it's still
|
||
|
// required by engine-api.
|
||
|
//
|
||
|
// go-dockerclient's current hijack implementation
|
||
|
// (https://github.com/fsouza/go-dockerclient/blob/89f3d56d93788dfe85f864a44f85d9738fca0670/client.go#L564)
|
||
|
// waits for all three streams (stdin/stdout/stderr) to finish copying
|
||
|
// before returning. When hijack finishes copying stdout/stderr, it calls
|
||
|
// Close() on its side of remoteStdin, which allows this copy to complete.
|
||
|
// When that happens, we must Close() on our side of remoteStdin, to
|
||
|
// allow the copy in hijack to complete, and hijack to return.
|
||
|
go func() {
|
||
|
defer runtime.HandleCrash()
|
||
|
defer once.Do(func() { p.remoteStdin.Close() })
|
||
|
|
||
|
// this "copy" doesn't actually read anything - it's just here to wait for
|
||
|
// the server to close remoteStdin.
|
||
|
if _, err := io.Copy(ioutil.Discard, p.remoteStdin); err != nil {
|
||
|
runtime.HandleError(err)
|
||
|
}
|
||
|
}()
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func (p *streamProtocolV2) copyStdout(wg *sync.WaitGroup) {
|
||
|
if p.Stdout == nil {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
wg.Add(1)
|
||
|
go func() {
|
||
|
defer runtime.HandleCrash()
|
||
|
defer wg.Done()
|
||
|
|
||
|
if _, err := io.Copy(p.Stdout, p.remoteStdout); err != nil {
|
||
|
runtime.HandleError(err)
|
||
|
}
|
||
|
}()
|
||
|
}
|
||
|
|
||
|
func (p *streamProtocolV2) copyStderr(wg *sync.WaitGroup) {
|
||
|
if p.Stderr == nil || p.Tty {
|
||
|
return
|
||
|
}
|
||
|
|
||
|
wg.Add(1)
|
||
|
go func() {
|
||
|
defer runtime.HandleCrash()
|
||
|
defer wg.Done()
|
||
|
|
||
|
if _, err := io.Copy(p.Stderr, p.remoteStderr); err != nil {
|
||
|
runtime.HandleError(err)
|
||
|
}
|
||
|
}()
|
||
|
}
|
||
|
|
||
|
func (p *streamProtocolV2) 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, &errorDecoderV2{})
|
||
|
|
||
|
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
|
||
|
}
|
||
|
|
||
|
// errorDecoderV2 interprets the error channel data as plain text.
|
||
|
type errorDecoderV2 struct{}
|
||
|
|
||
|
func (d *errorDecoderV2) decode(message []byte) error {
|
||
|
return fmt.Errorf("error executing remote command: %s", message)
|
||
|
}
|