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controller.go
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controller.go
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package controller
import (
"fmt"
"time"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/errors"
"k8s.io/kubernetes/pkg/util"
"github.com/openshift/origin/pkg/client"
"github.com/openshift/origin/pkg/dockerregistry"
"github.com/openshift/origin/pkg/image/api"
)
type ImportController struct {
streams client.ImageStreamsNamespacer
mappings client.ImageStreamMappingsNamespacer
// injected for testing
client dockerregistry.Client
}
// needsImport returns true if the provided image stream should have its tags imported.
func needsImport(stream *api.ImageStream) bool {
if len(stream.Spec.DockerImageRepository) == 0 {
return false
}
if stream.Annotations != nil && len(stream.Annotations[api.DockerImageRepositoryCheckAnnotation]) != 0 {
return false
}
return true
}
// retryCount is the number of times to retry on a conflict when updating an image stream
const retryCount = 2
// Next processes the given image stream, looking for streams that have DockerImageRepository
// set but have not yet been marked as "ready". If transient errors occur, err is returned but
// the image stream is not modified (so it will be tried again later). If a permanent
// failure occurs the image is marked with an annotation. The tags of the original spec image
// are left as is (those are updated through status).
func (c *ImportController) Next(stream *api.ImageStream) error {
if !needsImport(stream) {
return nil
}
name := stream.Spec.DockerImageRepository
ref, err := api.ParseDockerImageReference(name)
if err != nil {
err = fmt.Errorf("invalid docker image repository, cannot import data: %v", err)
util.HandleError(err)
return c.done(stream, err.Error(), retryCount)
}
insecure := stream.Annotations != nil && stream.Annotations[api.InsecureRepositoryAnnotation] == "true"
client := c.client
if client == nil {
client = dockerregistry.NewClient()
}
conn, err := client.Connect(ref.Registry, insecure)
if err != nil {
return err
}
tags, err := conn.ImageTags(ref.Namespace, ref.Name)
switch {
case dockerregistry.IsRepositoryNotFound(err), dockerregistry.IsRegistryNotFound(err):
return c.done(stream, err.Error(), retryCount)
case err != nil:
return err
}
imageToTag := make(map[string][]string)
for tag, image := range tags {
if specTag, ok := stream.Spec.Tags[tag]; ok && specTag.From != nil {
// spec tag is set to track another tag - do not import
continue
}
imageToTag[image] = append(imageToTag[image], tag)
}
// no tags to import
if len(imageToTag) == 0 {
return c.done(stream, "", retryCount)
}
for id, tags := range imageToTag {
dockerImage, err := conn.ImageByID(ref.Namespace, ref.Name, id)
switch {
case dockerregistry.IsRepositoryNotFound(err), dockerregistry.IsRegistryNotFound(err):
return c.done(stream, err.Error(), retryCount)
case dockerregistry.IsImageNotFound(err):
continue
case err != nil:
return err
}
var image api.DockerImage
if err := kapi.Scheme.Convert(&dockerImage.Image, &image); err != nil {
err = fmt.Errorf("could not convert image: %#v", err)
util.HandleError(err)
return c.done(stream, err.Error(), retryCount)
}
idTagPresent := false
if len(tags) > 1 && hasTag(tags, id) {
// only set to true if we have at least 1 tag that isn't the image id
idTagPresent = true
}
for _, tag := range tags {
if idTagPresent && id == tag {
continue
}
pullRef := api.DockerImageReference{
Registry: ref.Registry,
Namespace: ref.Namespace,
Name: ref.Name,
Tag: tag,
}
// prefer to pull by ID always
if dockerImage.PullByID {
// if the registry indicates the image is pullable by ID, clear the tag
pullRef.Tag = ""
pullRef.ID = dockerImage.ID
} else if idTagPresent {
// if there is a tag for the image by its id (tag=tag), we can pull by id
pullRef.Tag = id
}
mapping := &api.ImageStreamMapping{
ObjectMeta: kapi.ObjectMeta{
Name: stream.Name,
Namespace: stream.Namespace,
},
Tag: tag,
Image: api.Image{
ObjectMeta: kapi.ObjectMeta{
Name: dockerImage.ID,
},
DockerImageReference: pullRef.String(),
DockerImageMetadata: image,
},
}
if err := c.mappings.ImageStreamMappings(stream.Namespace).Create(mapping); err != nil {
if errors.IsNotFound(err) {
return c.done(stream, err.Error(), retryCount)
}
return err
}
}
}
// we've completed our updates
return c.done(stream, "", retryCount)
}
// done marks the stream as being processed due to an error or failure condition
func (c *ImportController) done(stream *api.ImageStream, reason string, retry int) error {
if len(reason) == 0 {
reason = util.Now().UTC().Format(time.RFC3339)
}
if stream.Annotations == nil {
stream.Annotations = make(map[string]string)
}
stream.Annotations[api.DockerImageRepositoryCheckAnnotation] = reason
if _, err := c.streams.ImageStreams(stream.Namespace).Update(stream); err != nil && !errors.IsNotFound(err) {
if errors.IsConflict(err) && retry > 0 {
if stream, err := c.streams.ImageStreams(stream.Namespace).Get(stream.Name); err == nil {
return c.done(stream, reason, retry-1)
}
}
return err
}
return nil
}
func hasTag(tags []string, tag string) bool {
for _, s := range tags {
if s == tag {
return true
}
}
return false
}