82 lines
3.0 KiB
Go
82 lines
3.0 KiB
Go
package propagationpolicy
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"k8s.io/klog/v2"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
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"github.com/karmada-io/karmada/pkg/util/helper"
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"github.com/karmada-io/karmada/pkg/util/validation"
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)
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// MutatingAdmission mutates API request if necessary.
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type MutatingAdmission struct {
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decoder *admission.Decoder
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DefaultNotReadyTolerationSeconds int64
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DefaultUnreachableTolerationSeconds int64
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}
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// Check if our MutatingAdmission implements necessary interface
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var _ admission.Handler = &MutatingAdmission{}
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var _ admission.DecoderInjector = &MutatingAdmission{}
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// NewMutatingHandler builds a new admission.Handler.
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func NewMutatingHandler(notReadyTolerationSeconds, unreachableTolerationSeconds int64) admission.Handler {
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return &MutatingAdmission{
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DefaultNotReadyTolerationSeconds: notReadyTolerationSeconds,
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DefaultUnreachableTolerationSeconds: unreachableTolerationSeconds,
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}
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}
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// Handle yields a response to an AdmissionRequest.
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func (a *MutatingAdmission) Handle(ctx context.Context, req admission.Request) admission.Response {
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policy := &policyv1alpha1.PropagationPolicy{}
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err := a.decoder.Decode(req, policy)
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if err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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klog.V(2).Infof("Mutating PropagationPolicy(%s/%s) for request: %s", policy.Namespace, policy.Name, req.Operation)
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// Set default namespace for all resource selector if not set.
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for i := range policy.Spec.ResourceSelectors {
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if len(policy.Spec.ResourceSelectors[i].Namespace) == 0 {
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klog.Infof("Setting resource selector default namespace for policy: %s/%s", policy.Namespace, policy.Name)
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policy.Spec.ResourceSelectors[i].Namespace = policy.Namespace
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}
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}
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if len(policy.Name) > validation.LabelValueMaxLength {
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return admission.Errored(http.StatusBadRequest, fmt.Errorf("PropagationPolicy's name should be no more than %d characters", validation.LabelValueMaxLength))
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}
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// Set default spread constraints if both 'SpreadByField' and 'SpreadByLabel' not set.
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helper.SetDefaultSpreadConstraints(policy.Spec.Placement.SpreadConstraints)
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helper.AddTolerations(&policy.Spec.Placement, helper.NewNotReadyToleration(a.DefaultNotReadyTolerationSeconds),
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helper.NewUnreachableToleration(a.DefaultUnreachableTolerationSeconds))
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addedResourceSelectors := helper.GetFollowedResourceSelectorsWhenMatchServiceImport(policy.Spec.ResourceSelectors)
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if addedResourceSelectors != nil {
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policy.Spec.ResourceSelectors = append(policy.Spec.ResourceSelectors, addedResourceSelectors...)
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}
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marshaledBytes, err := json.Marshal(policy)
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if err != nil {
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return admission.Errored(http.StatusInternalServerError, err)
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}
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return admission.PatchResponseFromRaw(req.Object.Raw, marshaledBytes)
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}
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// InjectDecoder implements admission.DecoderInjector interface.
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// A decoder will be automatically injected.
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func (a *MutatingAdmission) InjectDecoder(d *admission.Decoder) error {
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a.decoder = d
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return nil
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}
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