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110 lines
2.3 KiB
Go
110 lines
2.3 KiB
Go
package sshbytestream
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import (
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"io"
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"os"
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"os/exec"
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"github.com/zrepl/zrepl/model"
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"context"
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"fmt"
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"bytes"
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"sync"
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)
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var SSHCommand string = "ssh"
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func Incoming() (wc io.ReadWriteCloser, err error) {
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// derivce ReadWriteCloser from stdin & stdout
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return IncomingReadWriteCloser{}, nil
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}
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type IncomingReadWriteCloser struct{}
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func (f IncomingReadWriteCloser) Read(p []byte) (n int, err error) {
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return os.Stdin.Read(p)
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}
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func (f IncomingReadWriteCloser) Write(p []byte) (n int, err error) {
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return os.Stdout.Write(p)
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}
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func (f IncomingReadWriteCloser) Close() (err error) {
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os.Exit(0)
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return nil
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}
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func Outgoing(name string, remote model.SSHTransport) (conn io.ReadWriteCloser, err error) {
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ctx, cancel := context.WithCancel(context.Background())
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sshArgs := make([]string, 0, 2 * len(remote.Options) + len(remote.TransportOpenCommand) + 4)
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sshArgs = append(sshArgs,
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"-p", fmt.Sprintf("%d", remote.Port),
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"-o", "BatchMode=yes",
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)
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for _,option := range remote.Options {
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sshArgs = append(sshArgs, "-o", option)
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}
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sshArgs = append(sshArgs, fmt.Sprintf("%s@%s", remote.User, remote.Host))
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sshArgs = append(sshArgs, remote.TransportOpenCommand...)
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cmd := exec.CommandContext(ctx, SSHCommand, sshArgs...)
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var in io.WriteCloser
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var out io.ReadCloser
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if in, err = cmd.StdinPipe(); err != nil {
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return
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}
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if out,err = cmd.StdoutPipe(); err != nil {
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return
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}
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f := ForkedSSHReadWriteCloser{
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RemoteStdin: in,
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RemoteStdout: out,
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Cancel: cancel,
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Command: cmd,
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exitWaitGroup: &sync.WaitGroup{},
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}
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f.exitWaitGroup.Add(1)
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go func() {
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defer f.exitWaitGroup.Done()
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stderr, _ := cmd.StderrPipe()
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var b bytes.Buffer
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if err := cmd.Run(); err != nil {
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io.Copy(&b, stderr)
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fmt.Println(b.String())
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fmt.Printf("%v\n", cmd.ProcessState)
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//panic(err)
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}
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}()
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return f, nil
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}
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type ForkedSSHReadWriteCloser struct {
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RemoteStdin io.Writer
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RemoteStdout io.Reader
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Command *exec.Cmd
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Cancel context.CancelFunc
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exitWaitGroup *sync.WaitGroup
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}
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func (f ForkedSSHReadWriteCloser) Read(p []byte) (n int, err error) {
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return f.RemoteStdout.Read(p)
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}
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func (f ForkedSSHReadWriteCloser) Write(p []byte) (n int, err error) {
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return f.RemoteStdin.Write(p)
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}
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func (f ForkedSSHReadWriteCloser) Close() (err error) {
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f.Cancel()
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f.exitWaitGroup.Wait()
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return nil
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} |