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mirror of https://github.com/containrrr/watchtower.git synced 2024-12-15 09:14:13 +02:00
watchtower/container/client.go

206 lines
5.1 KiB
Go

package container
import (
"fmt"
"os"
"time"
log "github.com/Sirupsen/logrus"
dockerclient "github.com/docker/docker/client"
"github.com/docker/docker/api/types"
"golang.org/x/net/context"
)
const (
defaultStopSignal = "SIGTERM"
)
var username = os.Getenv("REPO_USER")
var password = os.Getenv("REPO_PASS")
var email = os.Getenv("REPO_EMAIL")
var api_version = "1.24"
// A Filter is a prototype for a function that can be used to filter the
// results from a call to the ListContainers() method on the Client.
type Filter func(Container) bool
// A Client is the interface through which watchtower interacts with the
// Docker API.
type Client interface {
ListContainers(Filter) ([]Container, error)
StopContainer(Container, time.Duration) error
StartContainer(Container) error
RenameContainer(Container, string) error
IsContainerStale(Container) (bool, error)
RemoveImage(Container) error
RegistryLogin(string) error
}
// NewClient returns a new Client instance which can be used to interact with
// the Docker API.
func NewClient(dockerHost string, pullImages bool) Client {
cli, err := dockerclient.NewClient(dockerHost, api_version, nil, nil)
if err != nil {
log.Fatalf("Error instantiating Docker client: %s", err)
}
return dockerClient{api: cli, pullImages: pullImages}
}
type dockerClient struct {
api *dockerclient.Client
pullImages bool
}
func (client dockerClient) RegistryLogin(registryURL string) error {
log.Debug("Login not implemented")
return nil
}
func (client dockerClient) ListContainers(fn Filter) ([]Container, error) {
cs := []Container{}
bg := context.Background()
log.Debug("Retrieving running containers")
runningContainers, err := client.api.ContainerList(
bg,
types.ContainerListOptions{})
if err != nil {
return nil, err
}
for _, runningContainer := range runningContainers {
containerInfo, err := client.api.ContainerInspect(bg, runningContainer.ID)
if err != nil {
return nil, err
}
imageInfo, _, err := client.api.ImageInspectWithRaw(bg, containerInfo.Image)
if err != nil {
return nil, err
}
c := Container{containerInfo: &containerInfo, imageInfo: &imageInfo}
if (fn(c)) {
cs = append(cs, c)
}
}
return cs, nil
}
func (client dockerClient) StopContainer(c Container, timeout time.Duration) error {
bg := context.Background()
signal := c.StopSignal()
if signal == "" {
signal = defaultStopSignal
}
log.Infof("Stopping %s (%s) with %s", c.Name(), c.ID(), signal)
if err := client.api.ContainerKill(bg, c.ID(), signal); err != nil {
return err
}
// Wait for container to exit, but proceed anyway after the timeout elapses
client.waitForStop(c, timeout)
log.Debugf("Removing container %s", c.ID())
if err := client.api.ContainerRemove(bg, c.ID(), types.ContainerRemoveOptions{Force: true, RemoveVolumes: false}); err != nil {
return err
}
// Wait for container to be removed. In this case an error is a good thing
if err := client.waitForStop(c, timeout); err == nil {
return fmt.Errorf("Container %s (%s) could not be removed", c.Name(), c.ID())
}
return nil
}
func (client dockerClient) StartContainer(c Container) error {
bg := context.Background();
config := c.runtimeConfig()
hostConfig := c.hostConfig()
name := c.Name()
log.Infof("Starting %s", name)
creation, err := client.api.ContainerCreate(bg, config, hostConfig, nil, name)
if err != nil {
return err
}
log.Debugf("Starting container %s (%s)", name, creation.ID)
return client.api.ContainerStart(bg, creation.ID, types.ContainerStartOptions{})
}
func (client dockerClient) RenameContainer(c Container, newName string) error {
log.Debugf("Renaming container %s (%s) to %s", c.Name(), c.ID(), newName)
//return client.api.ContainerRename(c.ID(), newName)
// no op
return nil
}
func (client dockerClient) IsContainerStale(c Container) (bool, error) {
bg := context.Background()
oldImageInfo := c.imageInfo
imageName := c.ImageName()
if client.pullImages {
log.Debugf("Pulling %s for %s", imageName, c.Name())
// Note: ImagePullOptions below can take a RegistryAuth arg if 401 on private registry
closer, err := client.api.ImagePull(bg, imageName, types.ImagePullOptions{})
if (err != nil) {
log.Debugf("Error pulling image %s, %s", imageName, err)
return false, err
} else {
closer.Close()
}
}
newImageInfo, _, err := client.api.ImageInspectWithRaw(bg, imageName)
if err != nil {
return false, err
}
if newImageInfo.ID != oldImageInfo.ID {
log.Infof("Found new %s image (%s)", imageName, newImageInfo.ID)
return true, nil
}
return false, nil
}
func (client dockerClient) RemoveImage(c Container) error {
imageID := c.ImageID()
log.Infof("Removing image %s", imageID)
_, err := client.api.ImageRemove(context.Background(), imageID, types.ImageRemoveOptions{Force: true})
return err
}
func (client dockerClient) waitForStop(c Container, waitTime time.Duration) error {
bg := context.Background()
timeout := time.After(waitTime)
for {
select {
case <-timeout:
return nil
default:
if ci, err := client.api.ContainerInspect(bg, c.ID()); err != nil {
return err
} else if !ci.State.Running {
return nil
}
}
time.Sleep(1 * time.Second)
}
}