func (e *Streamer) setupRequestParameters(obj runtime.Object) error {
versioned, err := api.Scheme.ConvertToVersion(obj, e.config.Version)
if err != nil {
return err
}
params, err := queryparams.Convert(versioned)
if err != nil {
return err
}
for k, v := range params {
for _, vv := range v {
e.req.Param(k, vv)
}
}
return nil
}
// Execute sends a remote command execution request, upgrading the
// connection and creating streams to represent stdin/stdout/stderr. Data is
// copied between these streams and the supplied stdin/stdout/stderr parameters.
func (e *Executor) Execute() error {
opts := api.PodExecOptions{
Stdin: (e.stdin != nil),
Stdout: (e.stdout != nil),
Stderr: (!e.tty && e.stderr != nil),
TTY: e.tty,
Command: e.command,
}
versioned, err := api.Scheme.ConvertToVersion(&opts, e.config.Version)
if err != nil {
return err
}
params, err := queryparams.Convert(versioned)
if err != nil {
return err
}
for k, v := range params {
for _, vv := range v {
e.req.Param(k, vv)
}
}
if e.upgrader == nil {
e.upgrader = &defaultUpgrader{}
}
conn, err := e.upgrader.upgrade(e.req, e.config)
if err != nil {
return err
}
defer conn.Close()
doneChan := make(chan struct{}, 2)
errorChan := make(chan error)
cp := func(s string, dst io.Writer, src io.Reader) {
glog.V(4).Infof("Copying %s", s)
defer glog.V(4).Infof("Done copying %s", s)
if _, err := io.Copy(dst, src); err != nil && err != io.EOF {
glog.Errorf("Error copying %s: %v", s, err)
}
if s == api.StreamTypeStdout || s == api.StreamTypeStderr {
doneChan <- struct{}{}
}
}
headers := http.Header{}
headers.Set(api.StreamType, api.StreamTypeError)
errorStream, err := conn.CreateStream(headers)
if err != nil {
return err
}
go func() {
message, err := ioutil.ReadAll(errorStream)
if err != nil && err != io.EOF {
errorChan <- fmt.Errorf("Error reading from error stream: %s", err)
return
}
if len(message) > 0 {
errorChan <- fmt.Errorf("Error executing remote command: %s", message)
return
}
}()
defer errorStream.Reset()
if opts.Stdin {
headers.Set(api.StreamType, api.StreamTypeStdin)
remoteStdin, err := conn.CreateStream(headers)
if err != nil {
return err
}
defer remoteStdin.Reset()
// TODO this goroutine will never exit cleanly (the io.Copy never unblocks)
// because stdin is not closed until the process exits. If we try to call
// stdin.Close(), it returns no error but doesn't unblock the copy. It will
// exit when the process exits, instead.
go cp(api.StreamTypeStdin, remoteStdin, e.stdin)
}
waitCount := 0
completedStreams := 0
if opts.Stdout {
waitCount++
headers.Set(api.StreamType, api.StreamTypeStdout)
remoteStdout, err := conn.CreateStream(headers)
if err != nil {
return err
}
defer remoteStdout.Reset()
go cp(api.StreamTypeStdout, e.stdout, remoteStdout)
}
if opts.Stderr && !e.tty {
waitCount++
headers.Set(api.StreamType, api.StreamTypeStderr)
remoteStderr, err := conn.CreateStream(headers)
if err != nil {
return err
}
defer remoteStderr.Reset()
go cp(api.StreamTypeStderr, e.stderr, remoteStderr)
}
Loop:
for {
select {
case <-doneChan:
completedStreams++
if completedStreams == waitCount {
break Loop
}
case err := <-errorChan:
return err
}
}
return nil
}