119 lines
3.2 KiB
Go
119 lines
3.2 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package remotecommand
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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"sync"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/remotecommand"
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"k8s.io/client-go/util/exec"
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)
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// streamProtocolV4 implements version 4 of the streaming protocol for attach
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// and exec. This version adds support for exit codes on the error stream through
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// the use of metav1.Status instead of plain text messages.
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type streamProtocolV4 struct {
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*streamProtocolV3
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}
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var _ streamProtocolHandler = &streamProtocolV4{}
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func newStreamProtocolV4(options StreamOptions) streamProtocolHandler {
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return &streamProtocolV4{
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streamProtocolV3: newStreamProtocolV3(options).(*streamProtocolV3),
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}
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}
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func (p *streamProtocolV4) createStreams(conn streamCreator) error {
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return p.streamProtocolV3.createStreams(conn)
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}
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func (p *streamProtocolV4) handleResizes() {
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p.streamProtocolV3.handleResizes()
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}
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func (p *streamProtocolV4) stream(conn streamCreator) error {
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if err := p.createStreams(conn); err != nil {
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return err
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}
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// now that all the streams have been created, proceed with reading & copying
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errorChan := watchErrorStream(p.errorStream, &errorDecoderV4{})
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p.handleResizes()
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p.copyStdin()
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var wg sync.WaitGroup
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p.copyStdout(&wg)
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p.copyStderr(&wg)
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// we're waiting for stdout/stderr to finish copying
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wg.Wait()
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// waits for errorStream to finish reading with an error or nil
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return <-errorChan
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}
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// errorDecoderV4 interprets the json-marshaled metav1.Status on the error channel
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// and creates an exec.ExitError from it.
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type errorDecoderV4 struct{}
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func (d *errorDecoderV4) decode(message []byte) error {
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status := metav1.Status{}
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err := json.Unmarshal(message, &status)
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if err != nil {
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return fmt.Errorf("error stream protocol error: %v in %q", err, string(message))
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}
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switch status.Status {
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case metav1.StatusSuccess:
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return nil
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case metav1.StatusFailure:
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if status.Reason == remotecommand.NonZeroExitCodeReason {
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if status.Details == nil {
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return errors.New("error stream protocol error: details must be set")
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}
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for i := range status.Details.Causes {
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c := &status.Details.Causes[i]
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if c.Type != remotecommand.ExitCodeCauseType {
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continue
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}
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rc, err := strconv.ParseUint(c.Message, 10, 8)
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if err != nil {
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return fmt.Errorf("error stream protocol error: invalid exit code value %q", c.Message)
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}
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return exec.CodeExitError{
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Err: fmt.Errorf("command terminated with exit code %d", rc),
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Code: int(rc),
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}
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}
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return fmt.Errorf("error stream protocol error: no %s cause given", remotecommand.ExitCodeCauseType)
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}
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default:
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return errors.New("error stream protocol error: unknown error")
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}
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return fmt.Errorf(status.Message)
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}
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