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package socket
import (
"bufio"
"errors"
"fmt"
"io"
"log"
"os/exec"
"strings"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/queue"
)
type execSocket struct {
Cmd string `opts:"required"`
}
type execConn struct {
s *execSocket
cmd *exec.Cmd
stdin io.WriteCloser
stdout io.ReadCloser
once sync.Once
wg sync.WaitGroup
}
func (s *execSocket) String() string {
return fmt.Sprintf("exec(%s)", s.Cmd)
}
func (s *execSocket) Close() {
}
func (s *execSocket) New(env env.Env) (Conn, error) {
tunnel, stream := env.Get("tunnel"), env.Get("stream")
args := strings.Fields(s.Cmd)
if len(args) == 0 {
return nil, errors.New("bad command")
}
cmd := exec.Command(args[0], args[1:]...)
stdin, _ := cmd.StdinPipe()
stdout, _ := cmd.StdoutPipe()
stderr, _ := cmd.StderrPipe()
if err := cmd.Start(); err != nil {
return nil, err
}
c := &execConn{
s: s,
cmd: cmd,
stdin: stdin,
stdout: stdout,
}
c.wg.Add(2)
go func(s string, r io.Reader) {
for scanner := bufio.NewScanner(r); scanner.Scan(); {
log.Printf("tunnel:%s stream:%s %s > %s", tunnel, stream, s, scanner.Text())
}
c.wg.Done()
}(args[0], stderr)
go func() {
c.wg.Wait()
c.cmd.Wait()
}()
return c, nil
}
func (c *execConn) String() string {
return c.s.String()
}
func (c *execConn) Send(wq queue.Q) error {
c.wg.Add(1)
defer c.wg.Done()
return queue.IoCopy(c.stdout, wq.Writer())
}
func (c *execConn) Recv(rq queue.Q) error {
c.wg.Add(1)
defer c.wg.Done()
return queue.IoCopy(rq.Reader(), c.stdin)
}
func (c *execConn) Close() error {
err := ErrAlreadyClosed
c.once.Do(func() {
log.Println("close", c.s)
c.cmd.Process.Kill()
c.wg.Done()
err = nil
})
return err
}
func init() {
register("exec", "in/out throw external process", execSocket{})
}
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