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docker_driver.go
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docker_driver.go
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package main
import (
"io/ioutil"
"time"
"net/url"
log "github.com/Sirupsen/logrus"
"github.com/fsouza/go-dockerclient"
)
// DockerDriver driver for runnig job in Docker.
type DockerDriver struct {
container *docker.Container
client *docker.Client
}
// NewDockerDriver returns a new docker driver.
func NewDockerDriver() (*DockerDriver, error) {
client, err := docker.NewVersionedClientFromEnv("") // TODO define version in config
if err != nil {
return nil, err
}
return &DockerDriver{
container: nil,
client: client,
}, nil
}
// Prepare Implementation of the prepare interface.
func (d *DockerDriver) Prepare(j *Job) error {
defer MeasureTime(time.Now(), log.Fields{"job": j, "job_id": j.ID}, "Container prepared.")
imageName, err := d.getImage(j)
if err != nil {
return err
}
// Prepare the run container.
d.container, err = d.client.CreateContainer(docker.CreateContainerOptions{
Config: getRunContainerConfig(j, imageName),
HostConfig: getHostConfig(j),
})
return err
}
// Run implementation of the driver interface.
func (d *DockerDriver) Run(j *Job) error {
defer MeasureTime(time.Now(), log.Fields{"job": j, "job_id": j.ID}, "Job finished.")
err := d.startContainer()
if err != nil {
log.Warn("Failed to start the container.")
return err
}
err = d.client.AttachToContainer(docker.AttachToContainerOptions{
Container: d.container.ID,
InputStream: j.Shell.Stdin,
OutputStream: j.Shell.Stdout,
ErrorStream: j.Shell.Stderr,
Logs: true,
Stream: true,
Stdin: true,
Stdout: true,
Stderr: true,
RawTerminal: j.Shell.TTY, // Use raw terminal with tty https://godoc.org/github.com/fsouza/go-dockerclient#AttachToContainerOptions
})
if err != nil {
log.Fatal("Failed to attach to the container.")
return err
}
err = d.removeContainer()
if err != nil {
log.Fatal("Failed to remove the container.")
}
return err
}
func (d *DockerDriver) Abort() error {
// No container created nothing to do
if d.container == nil {
return nil
}
// Remove Container and Force kill if needed.
return d.client.RemoveContainer(docker.RemoveContainerOptions{
ID: d.container.ID,
Force: true,
RemoveVolumes: true,
})
}
func (d *DockerDriver) startContainer() error {
err := d.client.StartContainer(d.container.ID, d.container.HostConfig)
return err
}
func (d *DockerDriver) removeContainer() error {
err := d.client.RemoveContainer(docker.RemoveContainerOptions{
ID: d.container.ID,
RemoveVolumes: true,
})
return err
}
func getRunContainerConfig(j *Job, imageName string) *docker.Config {
return &docker.Config{
AttachStdin: true,
AttachStdout: true,
AttachStderr: true,
Tty: j.Shell.TTY,
OpenStdin: true,
StdinOnce: true,
Env: j.Env,
Image: imageName,
Cmd: j.Cmd,
}
}
func getHostConfig(j *Job) *docker.HostConfig {
return &docker.HostConfig{
Binds: buildBindString(j.Mounts),
Privileged: j.Image.Privileged,
}
}
func buildBindString(mounts Mounts) []string {
var binds []string
for _, mount := range mounts {
binds = append(binds, mount.DockerBindString())
}
return binds
}
func (d *DockerDriver) getImage(j *Job) (string, error) {
if j.Image.Source {
log.WithFields(log.Fields{"image": j.Image}).Info("Dowloading image from source.")
imageName, err := d.importImage(j.Image.ImageSource)
return imageName, err
}
log.WithFields(log.Fields{"image": j.Image}).Info("Pulling image from docker hub.")
err := d.pullImage(j.Image.ImageName)
return j.Image.ImageName, err
}
func (d *DockerDriver) importImage(imageSource string) (string, error) {
// Use path as image name
u, err := url.Parse(imageSource)
if err != nil {
return "", err
}
imageName := u.Path[1:]
hasImage, err := d.imageExists(imageName + ":latest")
if err != nil {
return "", err
}
if hasImage {
return imageName, nil
}
err = d.client.ImportImage(docker.ImportImageOptions{
Source: imageSource,
Repository: imageName,
OutputStream: ioutil.Discard,
})
return imageName, err
}
func (d *DockerDriver) pullImage(imageName string) error {
// Check if image exist
hasImage, err := d.imageExists(imageName)
if err != nil {
return err
}
if hasImage {
return nil
}
// Pull image
err = d.client.PullImage(docker.PullImageOptions{
Repository: imageName,
OutputStream: ioutil.Discard,
}, docker.AuthConfiguration{})
return err
}
func (d *DockerDriver) imageExists(i string) (bool, error) {
images, err := d.client.ListImages(docker.ListImagesOptions{})
if err != nil {
return false, err
}
for _, image := range images {
for _, tag := range image.RepoTags {
if tag == i {
log.Println(tag)
return true, nil
}
}
}
return false, nil
}