/
session.go
118 lines (98 loc) · 2.14 KB
/
session.go
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package ssh
import (
"fmt"
"io"
"sync"
"time"
"golang.org/x/crypto/ssh"
)
type Session struct {
sshClient *ssh.Client
sshSession *ssh.Session
inputPipe io.WriteCloser
outputBuffer *OutputBuffer
outputDuration time.Duration
outputWriter io.Writer
leaveChan chan bool
wgExit sync.WaitGroup
}
func NewSession(sshClient *ssh.Client) *Session {
return &Session{
sshClient: sshClient,
outputBuffer: NewOutputBuffer(),
outputDuration: time.Millisecond * 1000,
leaveChan: make(chan bool),
}
}
func (s *Session) Establish() error {
sshSession, err := s.sshClient.NewSession()
if err != nil {
return err
}
stdinPipe, err := sshSession.StdinPipe()
if err != nil {
return err
}
sshSession.Stdout = s.outputBuffer
sshSession.Stderr = s.outputBuffer
modes := ssh.TerminalModes{
ssh.ECHO: 0,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
if err := sshSession.RequestPty("vt220", 32, 160, modes); err != nil {
return err
}
if err := sshSession.Shell(); err != nil {
return err
}
// Echo off mode above doesn't work for root for some reason
stdinPipe.Write([]byte("stty -echo\n"))
s.inputPipe = stdinPipe
s.sshSession = sshSession
return nil
}
func (s *Session) Disconnect() error {
if s.sshSession != nil {
_ = s.sshSession.Close()
}
s.wgExit.Wait()
return nil
}
func (s *Session) SetWriteCallback(writer io.Writer) {
s.outputWriter = writer
}
func (s *Session) Execute(cmd string) error {
text := fmt.Sprintf("%s\n", cmd)
if _, err := s.inputPipe.Write([]byte(text)); err != nil {
return err
}
return nil
}
func (s *Session) Watch() error {
s.wgExit.Add(1)
go s.output()
go s.wait()
return nil
}
func (s *Session) output() {
defer s.wgExit.Done()
tick := time.NewTicker(s.outputDuration)
defer tick.Stop()
for {
select {
case <-s.leaveChan:
data := s.outputBuffer.Shift()
_, _ = s.outputWriter.Write(data)
_, _ = s.outputWriter.Write([]byte(ShellExit))
return
case <-tick.C:
data := s.outputBuffer.Shift()
_, _ = s.outputWriter.Write(data)
}
}
}
func (s *Session) wait() {
_ = s.sshSession.Wait()
s.leaveChan <- true
}