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| 1 | +// Copyright 2025 The Cluster Monitoring Operator Authors |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +package clustermonitoring |
| 16 | + |
| 17 | +import ( |
| 18 | + "context" |
| 19 | + "fmt" |
| 20 | + "time" |
| 21 | + |
| 22 | + configv1alpha1 "github.com/openshift/api/config/v1alpha1" |
| 23 | + utilruntime "k8s.io/apimachinery/pkg/util/runtime" |
| 24 | + "k8s.io/client-go/tools/cache" |
| 25 | + "k8s.io/client-go/util/workqueue" |
| 26 | + "k8s.io/klog/v2" |
| 27 | + |
| 28 | + "github.com/openshift/cluster-monitoring-operator/pkg/client" |
| 29 | +) |
| 30 | + |
| 31 | +const ( |
| 32 | + controllerName = "cluster-monitoring" |
| 33 | + resyncPeriod = 15 * time.Minute |
| 34 | + queueBaseDelay = 50 * time.Millisecond |
| 35 | + queueMaxDelay = 3 * time.Minute |
| 36 | +) |
| 37 | + |
| 38 | +// Controller is a controller for ClusterMonitoring resources. |
| 39 | +type Controller struct { |
| 40 | + client *client.Client |
| 41 | + queue workqueue.TypedRateLimitingInterface[string] |
| 42 | + informer cache.SharedIndexInformer |
| 43 | + triggerReconcile func() |
| 44 | +} |
| 45 | + |
| 46 | +// NewController returns a new ClusterMonitoring controller. |
| 47 | +func NewController(ctx context.Context, client *client.Client, version string, triggerReconcile func()) (*Controller, error) { |
| 48 | + informer := cache.NewSharedIndexInformer( |
| 49 | + client.ClusterMonitoringListWatch(), |
| 50 | + &configv1alpha1.ClusterMonitoring{}, |
| 51 | + resyncPeriod, |
| 52 | + cache.Indexers{}, |
| 53 | + ) |
| 54 | + |
| 55 | + queue := workqueue.NewTypedRateLimitingQueueWithConfig[string]( |
| 56 | + workqueue.NewTypedItemExponentialFailureRateLimiter[string](queueBaseDelay, queueMaxDelay), |
| 57 | + workqueue.TypedRateLimitingQueueConfig[string]{Name: controllerName}, |
| 58 | + ) |
| 59 | + |
| 60 | + controller := &Controller{ |
| 61 | + client: client, |
| 62 | + queue: queue, |
| 63 | + informer: informer, |
| 64 | + triggerReconcile: triggerReconcile, |
| 65 | + } |
| 66 | + |
| 67 | + _, err := informer.AddEventHandler(cache.ResourceEventHandlerFuncs{ |
| 68 | + AddFunc: controller.handleAdd, |
| 69 | + UpdateFunc: controller.handleUpdate, |
| 70 | + DeleteFunc: controller.handleDelete, |
| 71 | + }) |
| 72 | + if err != nil { |
| 73 | + return nil, err |
| 74 | + } |
| 75 | + |
| 76 | + return controller, nil |
| 77 | +} |
| 78 | + |
| 79 | +// Run starts the controller. |
| 80 | +func (c *Controller) Run(ctx context.Context, workers int) { |
| 81 | + klog.Info("Starting ClusterMonitoring controller") |
| 82 | + defer c.queue.ShutDown() |
| 83 | + |
| 84 | + go c.informer.Run(ctx.Done()) |
| 85 | + |
| 86 | + if !cache.WaitForNamedCacheSync("ClusterMonitoring controller", ctx.Done(), c.informer.HasSynced) { |
| 87 | + klog.Error("Failed to sync ClusterMonitoring controller cache") |
| 88 | + return |
| 89 | + } |
| 90 | + |
| 91 | + go c.worker(ctx) |
| 92 | + |
| 93 | + klog.Info("ClusterMonitoring controller started") |
| 94 | + <-ctx.Done() |
| 95 | + klog.Info("ClusterMonitoring controller stopped") |
| 96 | +} |
| 97 | + |
| 98 | +func (c *Controller) worker(ctx context.Context) { |
| 99 | + for c.processNextWorkItem(ctx) { |
| 100 | + } |
| 101 | +} |
| 102 | + |
| 103 | +func (c *Controller) processNextWorkItem(ctx context.Context) bool { |
| 104 | + key, quit := c.queue.Get() |
| 105 | + if quit { |
| 106 | + return false |
| 107 | + } |
| 108 | + defer c.queue.Done(key) |
| 109 | + |
| 110 | + if err := c.sync(ctx, key); err != nil { |
| 111 | + utilruntime.HandleError(fmt.Errorf("error syncing ClusterMonitoring (%s): %w", key, err)) |
| 112 | + c.queue.AddRateLimited(key) |
| 113 | + return true |
| 114 | + } |
| 115 | + |
| 116 | + klog.V(4).Infof("ClusterMonitoring successfully synced: %s", key) |
| 117 | + c.queue.Forget(key) |
| 118 | + return true |
| 119 | +} |
| 120 | + |
| 121 | +func (c *Controller) sync(ctx context.Context, key string) error { |
| 122 | + klog.V(4).Infof("ClusterMonitoring controller processing: %s", key) |
| 123 | + |
| 124 | + if c.triggerReconcile != nil { |
| 125 | + c.triggerReconcile() |
| 126 | + } |
| 127 | + |
| 128 | + return nil |
| 129 | +} |
| 130 | + |
| 131 | +func (c *Controller) handleAdd(obj interface{}) { |
| 132 | + key, ok := c.keyFunc(obj) |
| 133 | + if !ok { |
| 134 | + return |
| 135 | + } |
| 136 | + klog.Infof("ClusterMonitoring added: %s", key) |
| 137 | + c.queue.Add(key) |
| 138 | +} |
| 139 | + |
| 140 | +func (c *Controller) handleUpdate(oldObj, newObj interface{}) { |
| 141 | + key, ok := c.keyFunc(newObj) |
| 142 | + if !ok { |
| 143 | + return |
| 144 | + } |
| 145 | + klog.Infof("ClusterMonitoring updated: %s", key) |
| 146 | + c.queue.Add(key) |
| 147 | +} |
| 148 | + |
| 149 | +func (c *Controller) handleDelete(obj interface{}) { |
| 150 | + key, ok := c.keyFunc(obj) |
| 151 | + if !ok { |
| 152 | + return |
| 153 | + } |
| 154 | + klog.Infof("ClusterMonitoring deleted: %s", key) |
| 155 | + c.queue.Add(key) |
| 156 | +} |
| 157 | + |
| 158 | +func (c *Controller) keyFunc(obj interface{}) (string, bool) { |
| 159 | + key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj) |
| 160 | + if err != nil { |
| 161 | + klog.Errorf("Creating key for ClusterMonitoring object failed: %v", err) |
| 162 | + return key, false |
| 163 | + } |
| 164 | + return key, true |
| 165 | +} |
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