2015-07-21 18:04:41 +02:00
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package container
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2015-07-14 22:51:12 +02:00
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import (
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2015-07-24 21:51:21 +02:00
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"crypto/tls"
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2015-07-28 21:29:20 +02:00
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"fmt"
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2015-07-17 20:56:09 +02:00
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"time"
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2015-07-14 22:51:12 +02:00
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2015-07-22 23:58:16 +02:00
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log "github.com/Sirupsen/logrus"
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2015-07-14 22:51:12 +02:00
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"github.com/samalba/dockerclient"
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)
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2015-07-21 18:04:41 +02:00
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const (
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defaultStopSignal = "SIGTERM"
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)
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2015-08-01 00:23:17 +02:00
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// A Filter is a prototype for a function that can be used to filter the
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// results from a call to the ListContainers() method on the Client.
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type Filter func(Container) bool
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// A Client is the interface through which watchtower interacts with the
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// Docker API.
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type Client interface {
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ListContainers(Filter) ([]Container, error)
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StopContainer(Container, time.Duration) error
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StartContainer(Container) error
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RenameContainer(Container, string) error
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IsContainerStale(Container) (bool, error)
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RemoveImage(Container) error
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}
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2015-08-01 00:23:17 +02:00
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// NewClient returns a new Client instance which can be used to interact with
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// the Docker API.
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func NewClient(dockerHost string, tlsConfig *tls.Config, pullImages bool) Client {
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docker, err := dockerclient.NewDockerClient(dockerHost, tlsConfig)
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if err != nil {
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log.Fatalf("Error instantiating Docker client: %s", err)
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}
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2015-08-01 00:04:56 +02:00
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return dockerClient{api: docker, pullImages: pullImages}
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2015-07-14 22:51:12 +02:00
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}
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type dockerClient struct {
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api dockerclient.Client
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pullImages bool
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) ListContainers(fn Filter) ([]Container, error) {
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cs := []Container{}
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2015-07-22 23:58:16 +02:00
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log.Debug("Retrieving running containers")
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2015-07-14 22:51:12 +02:00
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runningContainers, err := client.api.ListContainers(false, false, "")
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if err != nil {
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return nil, err
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}
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for _, runningContainer := range runningContainers {
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containerInfo, err := client.api.InspectContainer(runningContainer.Id)
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if err != nil {
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return nil, err
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}
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imageInfo, err := client.api.InspectImage(containerInfo.Image)
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if err != nil {
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return nil, err
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}
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2015-07-21 00:54:18 +02:00
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c := Container{containerInfo: containerInfo, imageInfo: imageInfo}
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if fn(c) {
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cs = append(cs, c)
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}
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2015-07-14 22:51:12 +02:00
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}
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return cs, nil
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) StopContainer(c Container, timeout time.Duration) error {
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signal := c.StopSignal()
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if signal == "" {
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signal = defaultStopSignal
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}
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2015-07-23 00:52:22 +02:00
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log.Infof("Stopping %s (%s) with %s", c.Name(), c.ID(), signal)
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if err := client.api.KillContainer(c.ID(), signal); err != nil {
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return err
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}
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2015-07-21 18:04:41 +02:00
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// Wait for container to exit, but proceed anyway after the timeout elapses
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client.waitForStop(c, timeout)
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2015-07-17 20:56:09 +02:00
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2015-07-23 00:52:22 +02:00
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log.Debugf("Removing container %s", c.ID())
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if err := client.api.RemoveContainer(c.ID(), true, false); err != nil {
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return err
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}
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// Wait for container to be removed. In this case an error is a good thing
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if err := client.waitForStop(c, timeout); err == nil {
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return fmt.Errorf("Container %s (%s) could not be removed", c.Name(), c.ID())
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}
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return nil
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) StartContainer(c Container) error {
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config := c.runtimeConfig()
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hostConfig := c.hostConfig()
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name := c.Name()
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2015-07-22 23:58:16 +02:00
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log.Infof("Starting %s", name)
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2015-07-14 22:51:12 +02:00
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2015-07-21 23:40:22 +02:00
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newContainerID, err := client.api.CreateContainer(config, name)
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if err != nil {
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return err
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}
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2015-07-22 23:58:16 +02:00
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log.Debugf("Starting container %s (%s)", name, newContainerID)
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return client.api.StartContainer(newContainerID, hostConfig)
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) RenameContainer(c Container, newName string) error {
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log.Debugf("Renaming container %s (%s) to %s", c.Name(), c.ID(), newName)
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return client.api.RenameContainer(c.ID(), newName)
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) IsContainerStale(c Container) (bool, error) {
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oldImageInfo := c.imageInfo
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2015-07-23 00:52:22 +02:00
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imageName := c.ImageName()
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2015-07-22 00:41:58 +02:00
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2015-07-22 01:29:00 +02:00
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if client.pullImages {
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2015-07-22 23:58:16 +02:00
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log.Debugf("Pulling %s for %s", imageName, c.Name())
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if err := client.api.PullImage(imageName, nil); err != nil {
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return false, err
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}
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}
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newImageInfo, err := client.api.InspectImage(imageName)
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if err != nil {
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return false, err
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}
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if newImageInfo.Id != oldImageInfo.Id {
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log.Infof("Found new %s image (%s)", imageName, newImageInfo.Id)
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return true, nil
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}
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return false, nil
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) RemoveImage(c Container) error {
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2015-07-31 20:24:27 +02:00
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imageID := c.ImageID()
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log.Infof("Removing image %s", imageID)
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_, err := client.api.RemoveImage(imageID)
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return err
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}
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2015-08-01 00:04:56 +02:00
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func (client dockerClient) waitForStop(c Container, waitTime time.Duration) error {
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2015-07-21 00:54:18 +02:00
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timeout := time.After(waitTime)
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for {
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select {
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case <-timeout:
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return nil
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default:
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2015-07-23 00:52:22 +02:00
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if ci, err := client.api.InspectContainer(c.ID()); err != nil {
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2015-07-21 00:54:18 +02:00
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return err
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} else if !ci.State.Running {
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return nil
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}
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}
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2015-07-29 22:03:47 +02:00
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time.Sleep(1 * time.Second)
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2015-07-21 00:54:18 +02:00
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}
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}
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