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Add HA support for the visibility API
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,52 @@ | ||
| /* | ||
| Copyright 2023 The Kubernetes Authors. | ||
| 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. | ||
| */ | ||
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| package core | ||
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| import ( | ||
| "context" | ||
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| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
| ) | ||
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| // WithLeadingManager returns a decorating reconcile.Reconciler that skips reconciliation requests | ||
| // until the manager has been elected leader. Once the manager is elected leader, the returned | ||
| // reconcile.Reconciler simply delegates to the provided reconcile.Reconciler. | ||
| func WithLeadingManager(mgr ctrl.Manager, reconciler reconcile.Reconciler) reconcile.Reconciler { | ||
| return &leaderAwareReconciler{ | ||
| elected: mgr.Elected(), | ||
| delegate: reconciler, | ||
| } | ||
| } | ||
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| type leaderAwareReconciler struct { | ||
| elected <-chan struct{} | ||
| delegate reconcile.Reconciler | ||
| } | ||
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| var _ reconcile.Reconciler = (*leaderAwareReconciler)(nil) | ||
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| func (r *leaderAwareReconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) { | ||
| select { | ||
| case <-r.elected: | ||
| // The manager has been elected leader, delegate reconciliation to the provided reconciler. | ||
| return r.delegate.Reconcile(ctx, request) | ||
| default: | ||
| // The manager hasn't been elected leader yet, skip reconciliation. | ||
| return ctrl.Result{}, nil | ||
| } | ||
| } |
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