forked from openshift/library-go
/
annotations.go
215 lines (193 loc) · 6.43 KB
/
annotations.go
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package trigger
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"k8s.io/klog"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"github.com/openshift/library-go/pkg/image/referencemutator"
)
func CalculateAnnotationTriggers(m metav1.Object, prefix string) (string, string, []ObjectFieldTrigger, error) {
var key, namespace string
if namespace = m.GetNamespace(); len(namespace) > 0 {
key = prefix + namespace + "/" + m.GetName()
} else {
key = prefix + m.GetName()
}
t, ok := m.GetAnnotations()[TriggerAnnotationKey]
if !ok {
return key, namespace, nil, nil
}
triggers := []ObjectFieldTrigger{}
if err := json.Unmarshal([]byte(t), &triggers); err != nil {
return key, namespace, nil, err
}
if hasDuplicateTriggers(triggers) {
return key, namespace, nil, fmt.Errorf("duplicate triggers are not allowed")
}
return key, namespace, triggers, nil
}
func hasDuplicateTriggers(triggers []ObjectFieldTrigger) bool {
for i := range triggers {
for j := i + 1; j < len(triggers); j++ {
if triggers[i].FieldPath == triggers[j].FieldPath {
return true
}
}
}
return false
}
func parseContainerReference(path string) (init bool, selector string, remainder string, ok bool) {
switch {
case strings.HasPrefix(path, "containers["):
remainder = strings.TrimPrefix(path, "containers[")
case strings.HasPrefix(path, "initContainers["):
init = true
remainder = strings.TrimPrefix(path, "initContainers[")
default:
return false, "", "", false
}
end := strings.Index(remainder, "]")
if end == -1 {
return false, "", "", false
}
selector = remainder[:end]
remainder = remainder[end+1:]
if len(remainder) > 0 && remainder[0] == '.' {
remainder = remainder[1:]
}
return init, selector, remainder, true
}
func findContainerBySelector(spec referencemutator.PodSpecReferenceMutator, init bool, selector string) (referencemutator.ContainerMutator, bool) {
if i, err := strconv.Atoi(selector); err == nil {
return spec.GetContainerByIndex(init, i)
}
// TODO: potentially make this more flexible, like whitespace
if name := strings.TrimSuffix(strings.TrimPrefix(selector, "?(@.name==\""), "\")"); name != selector {
return spec.GetContainerByName(name)
}
return nil, false
}
// ContainerForObjectFieldPath returns a reference to the container in the object with pod spec
// underneath fieldPath. Returns error if no such container exists or the field path is invalid.
// Returns the remaining field path beyond the container, if any.
func ContainerForObjectFieldPath(obj runtime.Object, fieldPath string) (referencemutator.ContainerMutator, string, error) {
spec, err := referencemutator.GetPodSpecReferenceMutator(obj)
if err != nil {
return nil, fieldPath, err
}
specPath := spec.Path().String()
containerPath := strings.TrimPrefix(fieldPath, specPath)
if containerPath == fieldPath {
return nil, fieldPath, fmt.Errorf("1 field path is not valid: %s", fieldPath)
}
containerPath = strings.TrimPrefix(containerPath, ".")
init, selector, remainder, ok := parseContainerReference(containerPath)
if !ok {
return nil, fieldPath, fmt.Errorf("2 field path is not valid: %s", fieldPath)
}
container, ok := findContainerBySelector(spec, init, selector)
if !ok {
return nil, fieldPath, fmt.Errorf("no such container: %s", selector)
}
return container, remainder, nil
}
// UpdateObjectFromImages attempts to set the appropriate object information. If changes are necessary, it lazily copies
// obj and returns it, or if no changes are necessary returns nil.
func UpdateObjectFromImages(obj runtime.Object, tagRetriever TagRetriever) (runtime.Object, error) {
var updated runtime.Object
m, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
spec, err := referencemutator.GetPodSpecReferenceMutator(obj)
if err != nil {
return nil, err
}
path := spec.Path()
basePath := path.String() + "."
_, _, triggers, err := CalculateAnnotationTriggers(m, "/")
if err != nil {
return nil, err
}
klog.V(5).Infof("%T/%s has triggers: %#v", obj, m.GetName(), triggers)
for _, trigger := range triggers {
if trigger.Paused {
continue
}
fieldPath := trigger.FieldPath
if !strings.HasPrefix(trigger.FieldPath, basePath) {
klog.V(5).Infof("%T/%s trigger %s did not match base path %s", obj, m.GetName(), trigger.FieldPath, basePath)
continue
}
fieldPath = strings.TrimPrefix(fieldPath, basePath)
namespace := trigger.From.Namespace
if len(namespace) == 0 {
namespace = m.GetNamespace()
}
ref, _, ok := tagRetriever.ImageStreamTag(namespace, trigger.From.Name)
if !ok {
klog.V(5).Infof("%T/%s detected no pending image on %s from %#v", obj, m.GetName(), trigger.FieldPath, trigger.From)
continue
}
init, selector, remainder, ok := parseContainerReference(fieldPath)
if !ok || remainder != "image" {
return nil, fmt.Errorf("field path is not valid: %s", trigger.FieldPath)
}
container, ok := findContainerBySelector(spec, init, selector)
if !ok {
return nil, fmt.Errorf("no such container: %s", trigger.FieldPath)
}
if container.GetImage() != ref {
if updated == nil {
updated = obj.DeepCopyObject()
spec, _ = referencemutator.GetPodSpecReferenceMutator(updated)
container, _ = findContainerBySelector(spec, init, selector)
}
klog.V(5).Infof("%T/%s detected change on %s = %s", obj, m.GetName(), trigger.FieldPath, ref)
container.SetImage(ref)
}
}
return updated, nil
}
// ContainerImageChanged returns true if any container image referenced by newTriggers changed.
func ContainerImageChanged(oldObj, newObj runtime.Object, newTriggers []ObjectFieldTrigger) bool {
for _, trigger := range newTriggers {
if trigger.Paused {
continue
}
newContainer, _, err := ContainerForObjectFieldPath(newObj, trigger.FieldPath)
if err != nil {
klog.V(5).Infof("%v", err)
continue
}
oldContainer, _, err := ContainerForObjectFieldPath(oldObj, trigger.FieldPath)
if err != nil {
// might just be a result of the update
continue
}
if newContainer.GetImage() != oldContainer.GetImage() {
return true
}
}
return false
}
type AnnotationUpdater interface {
Update(obj runtime.Object) error
}
type AnnotationReactor struct {
Updater AnnotationUpdater
}
func (r *AnnotationReactor) ImageChanged(obj runtime.Object, tagRetriever TagRetriever) error {
changed, err := UpdateObjectFromImages(obj, tagRetriever)
if err != nil {
return err
}
if changed != nil {
return r.Updater.Update(changed)
}
return nil
}