forked from kluctl/kluctl
/
images.go
253 lines (223 loc) · 6 KB
/
images.go
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package deployment
import (
"bytes"
"encoding/base64"
"fmt"
"github.com/codablock/kluctl/pkg/k8s"
"github.com/codablock/kluctl/pkg/registries"
"github.com/codablock/kluctl/pkg/types"
k8s2 "github.com/codablock/kluctl/pkg/types/k8s"
"github.com/codablock/kluctl/pkg/utils"
"github.com/codablock/kluctl/pkg/utils/uo"
"github.com/codablock/kluctl/pkg/utils/versions"
"github.com/codablock/kluctl/pkg/yaml"
"k8s.io/apimachinery/pkg/api/errors"
"strings"
"sync"
)
type Images struct {
updateImages bool
fixedImages []types.FixedImage
seenImages []types.FixedImage
mutex sync.Mutex
registryCache utils.ThreadSafeMultiCache
}
func NewImages(updateImages bool) (*Images, error) {
return &Images{
updateImages: updateImages,
}, nil
}
func (images *Images) AddFixedImage(fi types.FixedImage) {
images.fixedImages = append(images.fixedImages, fi)
}
func (images *Images) SeenImages(simple bool) []types.FixedImage {
var ret []types.FixedImage
for _, fi := range images.seenImages {
if simple {
ret = append(ret, types.FixedImage{
Image: fi.Image,
ResultImage: fi.ResultImage,
})
} else {
ret = append(ret, fi)
}
}
return ret
}
func (images *Images) GetFixedImage(image string, namespace string, deployment string, container string) *string {
for i := len(images.fixedImages) - 1; i >= 0; i-- {
fi := &images.fixedImages[i]
if fi.Image != image {
continue
}
if fi.Namespace != nil && namespace != *fi.Namespace {
continue
}
if fi.Deployment != nil && deployment != *fi.Deployment {
continue
}
if fi.Container != nil && container != *fi.Container {
continue
}
return &fi.ResultImage
}
return nil
}
func (images *Images) GetLatestImageFromRegistry(image string, latestVersion string) (*string, error) {
ret, err := images.registryCache.Get(image, "tag", func() (interface{}, error) {
return registries.ListImageTags(image)
})
if err != nil {
return nil, err
}
tags, _ := ret.([]string)
if len(tags) == 0 {
return nil, nil
}
lv, err := versions.ParseLatestVersion(latestVersion)
if err != nil {
return nil, err
}
tags = versions.Filter(lv, tags)
if len(tags) == 0 {
return nil, fmt.Errorf("no tag matched latest_version: %s", latestVersion)
}
latest := lv.Latest(tags)
result := fmt.Sprintf("%s:%s", image, latest)
return &result, nil
}
const beginPlaceholder = "XXXXXbegin_get_image_"
const endPlaceholder = "_end_get_imageXXXXX"
type placeHolder struct {
Image string `yaml:"image"`
LatestVersion string `yaml:"latestVersion"`
startOffset int
endOffset int
}
func (images *Images) parsePlaceholder(s string, offset int) (*placeHolder, error) {
start := strings.Index(s[offset:], beginPlaceholder)
if start == -1 {
return nil, nil
}
end := strings.Index(s[start:], endPlaceholder)
if end == -1 {
return nil, fmt.Errorf("beginPlaceholder marker without endPlaceholder marker")
}
b64 := s[start+len(beginPlaceholder) : end]
b, err := base64.StdEncoding.DecodeString(b64)
if err != nil {
return nil, err
}
var ph placeHolder
err = yaml.ReadYamlStream(bytes.NewReader(b), &ph)
if err != nil {
return nil, err
}
ph.startOffset = start
ph.endOffset = end + len(endPlaceholder)
return &ph, nil
}
func (images *Images) extractContainerName(parent interface{}) string {
parentM, ok := parent.(map[string]interface{})
if ok {
if x, ok := parentM["name"]; ok {
if y, ok := x.(string); ok {
return y
}
}
}
return ""
}
func (images *Images) ResolvePlaceholders(k *k8s.K8sCluster, o *uo.UnstructuredObject, deploymentDir string, tags []string) error {
ref := o.GetK8sRef()
deployment := fmt.Sprintf("%s/%s", ref.GVK.Kind, ref.Name)
var remoteObject *uo.UnstructuredObject
triedRemoteObject := false
err := uo.NewObjectIterator(o.Object).IterateLeafs(func(it *uo.ObjectIterator) error {
s, ok := it.Value().(string)
if !ok {
return nil
}
newS := ""
container := images.extractContainerName(it.Parent())
offset := 0
for true {
ph, err := images.parsePlaceholder(s, offset)
if err != nil {
return err
}
if ph == nil {
newS += s[offset:]
break
} else {
newS += s[offset:ph.startOffset]
}
if !triedRemoteObject {
triedRemoteObject = true
remoteObject, _, err = k.GetSingleObject(o.GetK8sRef())
if err != nil && !errors.IsNotFound(err) {
return err
}
}
var deployed *string
if remoteObject != nil && ph.startOffset == 0 && ph.endOffset == len(s) {
x, found, _ := remoteObject.GetNestedField(it.KeyPath()...)
if found {
if y, ok := x.(string); ok {
deployed = &y
}
}
}
resultImage, err := images.resolveImage(ph, ref, deployment, container, deployed, deploymentDir, tags)
if err != nil {
return err
}
if resultImage == nil {
return fmt.Errorf("failed to find image for %s and latest version %s", ph.Image, ph.LatestVersion)
}
newS += *resultImage
offset = ph.endOffset
if offset >= len(s) {
break
}
}
return it.SetValue(newS)
})
if err != nil {
return err
}
return nil
}
func (images *Images) resolveImage(ph *placeHolder, ref k8s2.ObjectRef, deployment string, container string, deployed *string, deploymentDir string, tags []string) (*string, error) {
fixed := images.GetFixedImage(ph.Image, ref.Namespace, deployment, container)
registry, err := images.GetLatestImageFromRegistry(ph.Image, ph.LatestVersion)
if err != nil {
return nil, err
}
result := deployed
if result == nil || images.updateImages {
result = registry
}
if !images.updateImages && fixed != nil {
result = fixed
}
if result != nil {
si := types.FixedImage{
Image: ph.Image,
ResultImage: *result,
DeployedImage: deployed,
RegistryImage: registry,
Namespace: &ref.Namespace,
Object: &ref,
Deployment: &deployment,
Container: &container,
VersionFilter: &ph.LatestVersion,
DeployTags: tags,
DeploymentDir: &deploymentDir,
}
images.mutex.Lock()
images.seenImages = append(images.seenImages, si)
images.mutex.Unlock()
}
return result, nil
}