// AttachToContainers attaches to all containers that specified to be running
func (client *DockerClient) AttachToContainers(containers []*Container) error {
running := []*Container{}
for _, c := range containers {
if c.State.Running {
running = append(running, c)
}
}
// Listen to events of all containers and re-attach if necessary
go client.listenReAttach(containers)
wg := util.NewErrorWaitGroup(len(running))
for _, container := range running {
if container.Io == nil {
if err := client.AttachToContainer(container); err != nil {
return err
}
}
go func(container *Container) {
wg.Done(container.Io.Wait())
}(container)
}
return wg.Wait()
}
// FetchImages fetches the missing images for all containers in the manifest
func (client *DockerClient) FetchImages(containers []*Container) error {
type message struct {
container *Container
result chan error
}
wg := util.NewErrorWaitGroup(len(containers))
chPullImages := make(chan message)
done := make(chan struct{}, 1)
checkedImages := map[string]struct{}{}
// Pull worker
// We do not want to pull images in parallel
// instead, we use an actor to pull images sequentially
//
// TODO: WAAAT? we can simplify it by going though a list of images sequentially
// and pull those images which are missing.
go func() {
for {
select {
case msg := <-chPullImages:
msg.result <- client.pullImageForContainer(msg.container)
case <-done:
return
}
}
}()
defer func() {
done <- struct{}{}
}()
for _, container := range containers {
if container.Image == nil {
return fmt.Errorf("Image is not specified for container %s", container.Name)
}
if _, ok := checkedImages[container.Image.String()]; ok {
wg.Done(nil)
continue
}
checkedImages[container.Image.String()] = struct{}{}
go func(container *Container) {
image, err := client.Docker.InspectImage(container.Image.String())
if err == docker.ErrNoSuchImage {
msg := message{container, make(chan error)}
chPullImages <- msg
wg.Done(<-msg.result)
return
} else if err != nil {
wg.Done(err)
return
}
container.ImageID = image.ID
wg.Done(nil)
}(container)
}
return wg.Wait()
}