176 lines
3.3 KiB
Go
176 lines
3.3 KiB
Go
package console
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import (
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"context"
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"errors"
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"io"
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"os"
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"os/exec"
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"runtime"
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"sync"
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rt "overlord-client/cmd/agent/runtime"
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"overlord-client/cmd/agent/wire"
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)
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type session struct {
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id string
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cmd *exec.Cmd
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stdin io.WriteCloser
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cancel context.CancelFunc
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env *rt.Env
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closed chan struct{}
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once sync.Once
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}
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var sessions sync.Map
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func shellCommand() []string {
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if runtime.GOOS == "windows" {
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return []string{"cmd.exe", "/d"}
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}
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return []string{"/bin/sh"}
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}
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func Start(ctx context.Context, env *rt.Env, sessionID string, _ int, _ int) error {
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//garble:controlflow block_splits=10 junk_jumps=10 flatten_passes=2
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if sessionID == "" {
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return errors.New("session id required")
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}
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Stop(sessionID)
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parts := shellCommand()
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cctx, cancel := context.WithCancel(ctx)
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cmd := exec.CommandContext(cctx, parts[0], parts[1:]...)
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if attr := platformSysProcAttr(); attr != nil {
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cmd.SysProcAttr = attr
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}
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cmd.Env = append(os.Environ(), "CLINK_NOAUTORUN=1")
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stdin, err := cmd.StdinPipe()
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if err != nil {
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cancel()
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return err
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}
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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cancel()
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return err
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}
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stderr, err := cmd.StderrPipe()
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if err != nil {
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cancel()
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return err
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}
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if err := cmd.Start(); err != nil {
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cancel()
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return err
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}
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sess := &session{id: sessionID, cmd: cmd, stdin: stdin, cancel: cancel, env: env, closed: make(chan struct{})}
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sessions.Store(sessionID, sess)
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go sess.forwardOutput(stdout)
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go sess.forwardOutput(stderr)
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go sess.waitExit()
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return nil
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}
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func Stop(sessionID string) {
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val, ok := sessions.LoadAndDelete(sessionID)
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if !ok {
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return
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}
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sess := val.(*session)
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sess.cancel()
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if sess.cmd.Process != nil {
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_ = sess.cmd.Process.Kill()
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}
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sess.once.Do(func() { close(sess.closed) })
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}
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func Input(sessionID string, data string) error {
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val, ok := sessions.Load(sessionID)
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if !ok {
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return errors.New("session not found")
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}
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sess := val.(*session)
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if sess.stdin == nil {
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return errors.New("stdin missing")
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}
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_, err := sess.stdin.Write([]byte(data))
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return err
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}
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func Resize(_ string, _ int, _ int) {
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}
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func (s *session) forwardOutput(r io.Reader) {
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buf := make([]byte, 4096)
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for {
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n, err := r.Read(buf)
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if n > 0 {
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clean := stripBackspaces(buf[:n])
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if len(clean) > 0 {
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_ = sendOutput(s.env, s.id, clean, nil, "")
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}
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}
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if err != nil {
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return
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}
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}
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}
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func (s *session) waitExit() {
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err := s.cmd.Wait()
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var codePtr *int
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msg := ""
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if err != nil {
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if exitErr, ok := err.(*exec.ExitError); ok {
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code := exitErr.ExitCode()
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codePtr = &code
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} else {
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msg = err.Error()
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}
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} else {
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code := 0
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codePtr = &code
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}
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_ = sendOutput(s.env, s.id, nil, codePtr, msg)
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sessions.Delete(s.id)
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s.once.Do(func() { close(s.closed) })
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}
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func sendOutput(env *rt.Env, sessionID string, data []byte, exitCode *int, errMsg string) error {
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payload := wire.ConsoleOutput{Type: "console_output", SessionID: sessionID}
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if len(data) > 0 {
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payload.Data = data
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}
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if errMsg != "" {
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payload.Error = errMsg
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}
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if exitCode != nil {
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payload.ExitCode = exitCode
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}
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return wire.WriteMsg(context.Background(), env.Conn, payload)
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}
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func stripBackspaces(src []byte) []byte {
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out := make([]byte, 0, len(src))
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for _, b := range src {
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if b == '\b' {
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if len(out) > 0 {
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out = out[:len(out)-1]
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}
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continue
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}
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out = append(out, b)
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}
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return out
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}
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