132 lines
2.3 KiB
Go
132 lines
2.3 KiB
Go
package data
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import (
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"bufio"
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"errors"
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"fmt"
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"github.com/kr/pty"
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"github.com/lunixbochs/vtclean"
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"io"
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"os/exec"
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"strings"
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"time"
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)
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const (
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startupTimeout = 100 * time.Millisecond
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minAwaitTimeout = 100 * time.Millisecond
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maxAwaitTimeout = 1 * time.Second
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)
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/**
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* Experimental
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*/
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type PtyInteractiveShell struct {
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item *Item
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variables []string
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cmd *exec.Cmd
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file io.WriteCloser
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ch chan string
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errCount int
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}
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func (s *PtyInteractiveShell) init() error {
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cmd := exec.Command("sh", "-c", *s.item.initScript)
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enrichEnvVariables(cmd, s.variables)
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file, err := pty.Start(cmd)
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if err != nil {
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return err
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}
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scanner := bufio.NewScanner(file)
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channel := make(chan string)
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go func() {
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for scanner.Scan() {
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channel <- scanner.Text()
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}
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}()
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s.cmd = cmd
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s.file = file
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s.ch = channel
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_, err = file.Read(make([]byte, 4096))
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if err != nil {
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return err
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}
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time.Sleep(startupTimeout)
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return nil
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}
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func (s *PtyInteractiveShell) execute() (string, error) {
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_, err := io.WriteString(s.file, fmt.Sprintf(" %s\n", s.item.sampleScript))
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if err != nil {
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s.errCount++
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if s.errCount > errorThreshold {
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_ = s.cmd.Wait()
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_ = s.file.Close()
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s.item.ptyShell = nil // restart session
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}
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return "", errors.New(fmt.Sprintf("Failed to execute command: %s", err))
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}
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softTimeout := make(chan bool, 1)
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hardTimeout := make(chan bool, 1)
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go func() {
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time.Sleep(s.getAwaitTimeout() / 2)
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softTimeout <- true
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time.Sleep(s.getAwaitTimeout() * 100)
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hardTimeout <- true
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}()
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var builder strings.Builder
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softTimeoutElapsed := false
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await:
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for {
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select {
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case out := <-s.ch:
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cout := vtclean.Clean(out, false)
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if len(cout) > 0 && !strings.Contains(cout, s.item.sampleScript) {
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builder.WriteString(cout)
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builder.WriteString("\n")
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if softTimeoutElapsed {
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break await
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}
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}
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case <-softTimeout:
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if builder.Len() > 0 {
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break await
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} else {
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softTimeoutElapsed = true
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}
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case <-hardTimeout:
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break await
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}
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}
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sample := strings.TrimSpace(builder.String())
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return s.item.transform(sample)
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}
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func (s *PtyInteractiveShell) getAwaitTimeout() time.Duration {
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timeout := time.Duration(s.item.rateMs) * time.Millisecond
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if timeout > maxAwaitTimeout {
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return maxAwaitTimeout
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} else if timeout < minAwaitTimeout {
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return minAwaitTimeout
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}
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return timeout
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}
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