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147 lines
4.1 KiB
Go
147 lines
4.1 KiB
Go
package containerd // import "github.com/docker/docker/plugin/executor/containerd"
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import (
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"context"
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"io"
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"path/filepath"
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"sync"
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"github.com/containerd/containerd/cio"
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"github.com/containerd/containerd/linux/runctypes"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/libcontainerd"
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"github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// PluginNamespace is the name used for the plugins namespace
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var PluginNamespace = "plugins.moby"
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// ExitHandler represents an object that is called when the exit event is received from containerd
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type ExitHandler interface {
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HandleExitEvent(id string) error
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}
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// New creates a new containerd plugin executor
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func New(rootDir string, remote libcontainerd.Remote, exitHandler ExitHandler) (*Executor, error) {
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e := &Executor{
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rootDir: rootDir,
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exitHandler: exitHandler,
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}
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client, err := remote.NewClient(PluginNamespace, e)
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if err != nil {
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return nil, errors.Wrap(err, "error creating containerd exec client")
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}
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e.client = client
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return e, nil
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}
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// Executor is the containerd client implementation of a plugin executor
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type Executor struct {
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rootDir string
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client libcontainerd.Client
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exitHandler ExitHandler
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}
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// Create creates a new container
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func (e *Executor) Create(id string, spec specs.Spec, stdout, stderr io.WriteCloser) error {
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opts := runctypes.RuncOptions{
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RuntimeRoot: filepath.Join(e.rootDir, "runtime-root"),
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}
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ctx := context.Background()
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err := e.client.Create(ctx, id, &spec, &opts)
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if err != nil {
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return err
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}
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_, err = e.client.Start(ctx, id, "", false, attachStreamsFunc(stdout, stderr))
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return err
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}
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// Restore restores a container
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func (e *Executor) Restore(id string, stdout, stderr io.WriteCloser) error {
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alive, _, err := e.client.Restore(context.Background(), id, attachStreamsFunc(stdout, stderr))
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if err != nil && !errdefs.IsNotFound(err) {
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return err
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}
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if !alive {
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_, _, err = e.client.DeleteTask(context.Background(), id)
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if err != nil && !errdefs.IsNotFound(err) {
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logrus.WithError(err).Errorf("failed to delete container plugin %s task from containerd", id)
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return err
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}
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err = e.client.Delete(context.Background(), id)
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if err != nil && !errdefs.IsNotFound(err) {
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logrus.WithError(err).Errorf("failed to delete container plugin %s from containerd", id)
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return err
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}
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}
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return nil
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}
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// IsRunning returns if the container with the given id is running
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func (e *Executor) IsRunning(id string) (bool, error) {
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status, err := e.client.Status(context.Background(), id)
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return status == libcontainerd.StatusRunning, err
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}
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// Signal sends the specified signal to the container
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func (e *Executor) Signal(id string, signal int) error {
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return e.client.SignalProcess(context.Background(), id, libcontainerd.InitProcessName, signal)
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}
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// ProcessEvent handles events from containerd
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// All events are ignored except the exit event, which is sent of to the stored handler
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func (e *Executor) ProcessEvent(id string, et libcontainerd.EventType, ei libcontainerd.EventInfo) error {
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switch et {
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case libcontainerd.EventExit:
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// delete task and container
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if _, _, err := e.client.DeleteTask(context.Background(), id); err != nil {
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logrus.WithError(err).Errorf("failed to delete container plugin %s task from containerd", id)
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}
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if err := e.client.Delete(context.Background(), id); err != nil {
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logrus.WithError(err).Errorf("failed to delete container plugin %s from containerd", id)
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}
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return e.exitHandler.HandleExitEvent(ei.ContainerID)
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}
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return nil
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}
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type rio struct {
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cio.IO
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wg sync.WaitGroup
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}
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func (c *rio) Wait() {
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c.wg.Wait()
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c.IO.Wait()
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}
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func attachStreamsFunc(stdout, stderr io.WriteCloser) libcontainerd.StdioCallback {
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return func(iop *cio.DirectIO) (cio.IO, error) {
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if iop.Stdin != nil {
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iop.Stdin.Close()
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// closing stdin shouldn't be needed here, it should never be open
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panic("plugin stdin shouldn't have been created!")
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}
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rio := &rio{IO: iop}
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rio.wg.Add(2)
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go func() {
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io.Copy(stdout, iop.Stdout)
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stdout.Close()
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rio.wg.Done()
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}()
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go func() {
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io.Copy(stderr, iop.Stderr)
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stderr.Close()
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rio.wg.Done()
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}()
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return rio, nil
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}
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}
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