118 lines
2.1 KiB
Go
118 lines
2.1 KiB
Go
package containerd
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import (
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"context"
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"io"
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"os/exec"
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"sync"
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"syscall"
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"github.com/pkg/errors"
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)
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type daemon struct {
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sync.Mutex
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addr string
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cmd *exec.Cmd
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}
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func (d *daemon) start(name, address string, args []string, stdout, stderr io.Writer) error {
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d.Lock()
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defer d.Unlock()
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if d.cmd != nil {
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return errors.New("daemon is already running")
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}
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args = append(args, []string{"--address", address}...)
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cmd := exec.Command(name, args...)
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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if err := cmd.Start(); err != nil {
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cmd.Wait()
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return errors.Wrap(err, "failed to start daemon")
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}
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d.addr = address
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d.cmd = cmd
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return nil
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}
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func (d *daemon) waitForStart(ctx context.Context) (*Client, error) {
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var (
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client *Client
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serving bool
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err error
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)
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client, err = New(address)
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if err != nil {
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return nil, err
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}
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serving, err = client.IsServing(ctx)
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if !serving {
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client.Close()
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if err == nil {
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err = errors.New("connection was successful but service is not available")
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}
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return nil, err
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}
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return client, err
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}
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func (d *daemon) Stop() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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return d.cmd.Process.Signal(syscall.SIGTERM)
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}
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func (d *daemon) Kill() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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return d.cmd.Process.Kill()
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}
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func (d *daemon) Wait() error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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err := d.cmd.Wait()
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d.cmd = nil
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return err
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}
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func (d *daemon) Restart(stopCb func()) error {
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d.Lock()
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defer d.Unlock()
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if d.cmd == nil {
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return errors.New("daemon is not running")
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}
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var err error
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if err = d.cmd.Process.Signal(syscall.SIGTERM); err != nil {
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return errors.Wrap(err, "failed to signal daemon")
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}
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d.cmd.Wait()
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if stopCb != nil {
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stopCb()
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}
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cmd := exec.Command(d.cmd.Path, d.cmd.Args[1:]...)
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cmd.Stdout = d.cmd.Stdout
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cmd.Stderr = d.cmd.Stderr
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if err := cmd.Start(); err != nil {
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cmd.Wait()
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return errors.Wrap(err, "failed to start new daemon instance")
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}
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d.cmd = cmd
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return nil
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}
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