119 lines
3.3 KiB
Go
119 lines
3.3 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"
|
|
"errors"
|
|
"fmt"
|
|
"strconv"
|
|
"sync"
|
|
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/kubernetes/pkg/kubelet/server/remotecommand"
|
|
"k8s.io/kubernetes/pkg/util/exec"
|
|
)
|
|
|
|
// streamProtocolV4 implements version 4 of the streaming protocol for attach
|
|
// and exec. This version adds support for exit codes on the error stream through
|
|
// the use of metav1.Status instead of plain text messages.
|
|
type streamProtocolV4 struct {
|
|
*streamProtocolV3
|
|
}
|
|
|
|
var _ streamProtocolHandler = &streamProtocolV4{}
|
|
|
|
func newStreamProtocolV4(options StreamOptions) streamProtocolHandler {
|
|
return &streamProtocolV4{
|
|
streamProtocolV3: newStreamProtocolV3(options).(*streamProtocolV3),
|
|
}
|
|
}
|
|
|
|
func (p *streamProtocolV4) createStreams(conn streamCreator) error {
|
|
return p.streamProtocolV3.createStreams(conn)
|
|
}
|
|
|
|
func (p *streamProtocolV4) handleResizes() {
|
|
p.streamProtocolV3.handleResizes()
|
|
}
|
|
|
|
func (p *streamProtocolV4) 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, &errorDecoderV4{})
|
|
|
|
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
|
|
}
|
|
|
|
// errorDecoderV4 interprets the json-marshaled metav1.Status on the error channel
|
|
// and creates an exec.ExitError from it.
|
|
type errorDecoderV4 struct{}
|
|
|
|
func (d *errorDecoderV4) decode(message []byte) error {
|
|
status := metav1.Status{}
|
|
err := json.Unmarshal(message, &status)
|
|
if err != nil {
|
|
return fmt.Errorf("error stream protocol error: %v in %q", err, string(message))
|
|
}
|
|
switch status.Status {
|
|
case metav1.StatusSuccess:
|
|
return nil
|
|
case metav1.StatusFailure:
|
|
if status.Reason == remotecommand.NonZeroExitCodeReason {
|
|
if status.Details == nil {
|
|
return errors.New("error stream protocol error: details must be set")
|
|
}
|
|
for i := range status.Details.Causes {
|
|
c := &status.Details.Causes[i]
|
|
if c.Type != remotecommand.ExitCodeCauseType {
|
|
continue
|
|
}
|
|
|
|
rc, err := strconv.ParseUint(c.Message, 10, 8)
|
|
if err != nil {
|
|
return fmt.Errorf("error stream protocol error: invalid exit code value %q", c.Message)
|
|
}
|
|
return exec.CodeExitError{
|
|
Err: fmt.Errorf("command terminated with exit code %d", rc),
|
|
Code: int(rc),
|
|
}
|
|
}
|
|
|
|
return fmt.Errorf("error stream protocol error: no %s cause given", remotecommand.ExitCodeCauseType)
|
|
}
|
|
default:
|
|
return errors.New("error stream protocol error: unknown error")
|
|
}
|
|
|
|
return fmt.Errorf(status.Message)
|
|
}
|