/
controller.go
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/
controller.go
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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package node
import (
"context"
"fmt"
"go.uber.org/multierr"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
"knative.dev/pkg/logging"
controllerruntime "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
"github.com/awslabs/karpenter/pkg/apis/provisioning/v1alpha5"
"github.com/awslabs/karpenter/pkg/utils/result"
)
// NewController constructs a controller instance
func NewController(kubeClient client.Client) *Controller {
return &Controller{
kubeClient: kubeClient,
liveness: &Liveness{kubeClient: kubeClient},
emptiness: &Emptiness{kubeClient: kubeClient},
expiration: &Expiration{kubeClient: kubeClient},
}
}
// Controller manages a set of properites on karpenter provisioned nodes, such as
// taints, labels, finalizers.
type Controller struct {
kubeClient client.Client
readiness *Readiness
liveness *Liveness
emptiness *Emptiness
expiration *Expiration
finalizer *Finalizer
}
// Reconcile executes a reallocation control loop for the resource
func (c *Controller) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
ctx = logging.WithLogger(ctx, logging.FromContext(ctx).Named("Node"))
// 1. Retrieve Node, ignore if not provisioned or terminating
stored := &v1.Node{}
if err := c.kubeClient.Get(ctx, req.NamespacedName, stored); err != nil {
if errors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
if _, ok := stored.Labels[v1alpha5.ProvisionerNameLabelKey]; !ok {
return reconcile.Result{}, nil
}
if !stored.DeletionTimestamp.IsZero() {
return reconcile.Result{}, nil
}
// 2. Retrieve Provisioner
provisioner := &v1alpha5.Provisioner{}
if err := c.kubeClient.Get(ctx, types.NamespacedName{Name: stored.Labels[v1alpha5.ProvisionerNameLabelKey]}, provisioner); err != nil {
return reconcile.Result{}, err
}
// 3. Execute reconcilers
node := stored.DeepCopy()
var results []reconcile.Result
var errs error
for _, reconciler := range []interface {
Reconcile(context.Context, *v1alpha5.Provisioner, *v1.Node) (reconcile.Result, error)
}{
c.readiness,
c.liveness,
c.expiration,
c.emptiness,
c.finalizer,
} {
res, err := reconciler.Reconcile(ctx, provisioner, node)
errs = multierr.Append(errs, err)
results = append(results, res)
}
// 4. Patch any changes, regardless of errors
if !equality.Semantic.DeepEqual(node, stored) {
if err := c.kubeClient.Patch(ctx, node, client.MergeFrom(stored)); err != nil {
return reconcile.Result{}, fmt.Errorf("patching node %s, %w", node.Name, err)
}
}
// 5. Requeue if error or if retryAfter is set
if errs != nil {
return reconcile.Result{}, errs
}
return result.Min(results...), nil
}
func (c *Controller) Register(ctx context.Context, m manager.Manager) error {
return controllerruntime.
NewControllerManagedBy(m).
Named("Node").
For(&v1.Node{}).
Watches(
// Reconcile all nodes related to a provisioner when it changes.
&source.Kind{Type: &v1alpha5.Provisioner{}},
handler.EnqueueRequestsFromMapFunc(func(o client.Object) (requests []reconcile.Request) {
nodes := &v1.NodeList{}
if err := c.kubeClient.List(ctx, nodes, client.MatchingLabels(map[string]string{v1alpha5.ProvisionerNameLabelKey: o.GetName()})); err != nil {
logging.FromContext(ctx).Errorf("Failed to list nodes when mapping expiration watch events, %s", err.Error())
return requests
}
for _, node := range nodes.Items {
requests = append(requests, reconcile.Request{NamespacedName: types.NamespacedName{Name: node.Name}})
}
return requests
}),
).
Watches(
// Reconcile node when a pod assigned to it changes.
&source.Kind{Type: &v1.Pod{}},
handler.EnqueueRequestsFromMapFunc(func(o client.Object) (requests []reconcile.Request) {
if name := o.(*v1.Pod).Spec.NodeName; name != "" {
requests = append(requests, reconcile.Request{NamespacedName: types.NamespacedName{Name: name}})
}
return requests
}),
).
WithOptions(controller.Options{MaxConcurrentReconciles: 10}).
Complete(c)
}