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slave.go
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slave.go
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package docker
import (
"time"
apiTypes "github.com/docker/docker/api/types"
)
// execInjector implement webtty.Slave
type execInjector struct {
hResp apiTypes.HijackedResponse
resize resizeFunction
activeChan chan struct{}
}
type resizeFunction func(width int, height int) error
func newExecInjector(resp apiTypes.HijackedResponse, resize resizeFunction) *execInjector {
return &execInjector{
hResp: resp,
resize: resize,
activeChan: make(chan struct{}, 5),
}
}
func (enj *execInjector) Read(p []byte) (n int, err error) {
go func() {
if len(enj.activeChan) != 0 {
return
}
enj.activeChan <- struct{}{}
}()
// logrus.Debugf("output: %s\n", p)
return enj.hResp.Reader.Read(p)
}
func (enj *execInjector) Write(p []byte) (n int, err error) {
// logrus.Debugf("input: %s\n", p)
return enj.hResp.Conn.Write(p)
}
func (enj *execInjector) Exit() error {
enj.Write([]byte("exit\n"))
close(enj.activeChan)
return enj.hResp.Conn.Close()
}
func (enj *execInjector) ActiveChan() <-chan struct{} {
return enj.activeChan
}
func (enj *execInjector) WindowTitleVariables() map[string]interface{} {
return map[string]interface{}{}
}
func (enj *execInjector) ResizeTerminal(width int, height int) (err error) {
// since the process may not up so fast, give it 150ms
// retry 3 times
for i := 0; i < 3; i++ {
if err = enj.resize(width, height); err == nil {
return
}
time.Sleep(time.Millisecond * 50)
}
return
}