111 lines
2.5 KiB
Go
111 lines
2.5 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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"io"
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"net/http"
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"sync"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/runtime"
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)
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// streamProtocolV3 implements version 3 of the streaming protocol for attach
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// and exec. This version adds support for resizing the container's terminal.
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type streamProtocolV3 struct {
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*streamProtocolV2
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resizeStream io.Writer
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}
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var _ streamProtocolHandler = &streamProtocolV3{}
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func newStreamProtocolV3(options StreamOptions) streamProtocolHandler {
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return &streamProtocolV3{
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streamProtocolV2: newStreamProtocolV2(options).(*streamProtocolV2),
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}
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}
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func (p *streamProtocolV3) createStreams(conn streamCreator) error {
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// set up the streams from v2
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if err := p.streamProtocolV2.createStreams(conn); err != nil {
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return err
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}
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// set up resize stream
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if p.Tty {
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headers := http.Header{}
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headers.Set(v1.StreamType, v1.StreamTypeResize)
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var err error
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p.resizeStream, err = conn.CreateStream(headers)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (p *streamProtocolV3) handleResizes() {
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if p.resizeStream == nil || p.TerminalSizeQueue == nil {
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return
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}
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go func() {
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defer runtime.HandleCrash()
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encoder := json.NewEncoder(p.resizeStream)
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for {
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size := p.TerminalSizeQueue.Next()
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if size == nil {
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return
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}
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if err := encoder.Encode(&size); err != nil {
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runtime.HandleError(err)
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}
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}
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}()
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}
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func (p *streamProtocolV3) 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, &errorDecoderV3{})
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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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type errorDecoderV3 struct {
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errorDecoderV2
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}
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