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feat(backendconnection): watch and reconcile OTel collector resources
Watch the K8s resources for the OpenTelemetry collector daemonset and deployment which are managed by the operator, reconcile them back into their desired state if they have been changed externally.
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159 changes: 159 additions & 0 deletions
159
internal/backendconnection/backend_connection_controller.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| // SPDX-FileCopyrightText: Copyright 2024 Dash0 Inc. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
|
||
| package backendconnection | ||
|
|
||
| import ( | ||
| "context" | ||
| "slices" | ||
|
|
||
| appsv1 "k8s.io/api/apps/v1" | ||
| corev1 "k8s.io/api/core/v1" | ||
| rbacv1 "k8s.io/api/rbac/v1" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/builder" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/event" | ||
| "sigs.k8s.io/controller-runtime/pkg/handler" | ||
| "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/predicate" | ||
| "sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
|
|
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| dash0v1alpha1 "github.com/dash0hq/dash0-operator/api/dash0monitoring/v1alpha1" | ||
| "github.com/dash0hq/dash0-operator/internal/backendconnection/otelcolresources" | ||
| "github.com/dash0hq/dash0-operator/internal/dash0/selfmonitoring" | ||
| "github.com/dash0hq/dash0-operator/internal/dash0/util" | ||
| ) | ||
|
|
||
| type BackendConnectionReconciler struct { | ||
| client.Client | ||
| BackendConnectionManager *BackendConnectionManager | ||
| Images util.Images | ||
| OperatorNamespace string | ||
| OTelCollectorNamePrefix string | ||
| } | ||
|
|
||
| func (r *BackendConnectionReconciler) SetupWithManager(mgr ctrl.Manager) error { | ||
| return ctrl.NewControllerManagedBy(mgr). | ||
| Named("dash0backendconnectioncontroller"). | ||
| Watches( | ||
| &corev1.ConfigMap{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.DaemonSetCollectorConfigConfigMapName(r.OTelCollectorNamePrefix), | ||
| otelcolresources.DeploymentCollectorConfigConfigMapName(r.OTelCollectorNamePrefix), | ||
| // Note: We are deliberately not watching the filelog receiver offsets ConfigMap, since it is updated | ||
| // frequently by the filelog offset synch container and does not require reconciliation. | ||
| })). | ||
| Watches( | ||
| &rbacv1.ClusterRole{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.DaemonSetClusterRoleName(r.OTelCollectorNamePrefix), | ||
| otelcolresources.DeploymentClusterRoleName(r.OTelCollectorNamePrefix), | ||
| })). | ||
| Watches( | ||
| &rbacv1.ClusterRoleBinding{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.DeploymentClusterRoleBindingName(r.OTelCollectorNamePrefix), | ||
| otelcolresources.DeploymentClusterRoleName(r.OTelCollectorNamePrefix), | ||
| })). | ||
| Watches( | ||
| &corev1.Service{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.ServiceName(r.OTelCollectorNamePrefix), | ||
| })). | ||
| Watches( | ||
| &appsv1.DaemonSet{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.DaemonSetName(r.OTelCollectorNamePrefix), | ||
| })). | ||
| Watches( | ||
| &appsv1.Deployment{}, | ||
| &handler.EnqueueRequestForObject{}, | ||
| r.withNamePredicate([]string{ | ||
| otelcolresources.DeploymentName(r.OTelCollectorNamePrefix), | ||
| })). | ||
| Complete(r) | ||
| } | ||
|
|
||
| func (r *BackendConnectionReconciler) withNamePredicate(resourceNames []string) builder.Predicates { | ||
| return builder.WithPredicates(r.createFilterPredicate(resourceNames)) | ||
| } | ||
|
|
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| func (r *BackendConnectionReconciler) createFilterPredicate(resourceNames []string) predicate.Funcs { | ||
| resourceNamespace := r.OperatorNamespace | ||
| return predicate.Funcs{ | ||
| CreateFunc: func(e event.CreateEvent) bool { | ||
| return resourceMatches(e.Object, resourceNamespace, resourceNames) | ||
| }, | ||
| UpdateFunc: func(e event.UpdateEvent) bool { | ||
| return resourceMatches(e.ObjectOld, resourceNamespace, resourceNames) || | ||
| resourceMatches(e.ObjectNew, resourceNamespace, resourceNames) | ||
| }, | ||
| DeleteFunc: func(e event.DeleteEvent) bool { | ||
| return resourceMatches(e.Object, resourceNamespace, resourceNames) | ||
| }, | ||
| GenericFunc: func(e event.GenericEvent) bool { | ||
| return resourceMatches(e.Object, resourceNamespace, resourceNames) | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func resourceMatches(object client.Object, resourceNamespace string, resourceNames []string) bool { | ||
| if object.GetNamespace() != resourceNamespace { | ||
| return false | ||
| } | ||
| return slices.Contains(resourceNames, object.GetName()) | ||
| } | ||
|
|
||
| func (r *BackendConnectionReconciler) Reconcile( | ||
| ctx context.Context, | ||
| request reconcile.Request, | ||
| ) (reconcile.Result, error) { | ||
| logger := log.FromContext(ctx) | ||
| logger.Info("reconciling backend connection resources", "request", request) | ||
|
|
||
| allDash0MonitoringResouresInCluster := &dash0v1alpha1.Dash0MonitoringList{} | ||
| if err := r.List( | ||
| ctx, | ||
| allDash0MonitoringResouresInCluster, | ||
| &client.ListOptions{}, | ||
| ); err != nil { | ||
| logger.Error(err, "Failed to list all Dash0 monitoring resources when reconciling backend connection resources.") | ||
| return reconcile.Result{}, err | ||
| } | ||
|
|
||
| if len(allDash0MonitoringResouresInCluster.Items) == 0 { | ||
| logger.Info("No Dash0 monitoring resources in cluster, aborting the backend connection resources reconciliation.") | ||
| return reconcile.Result{}, nil | ||
| } | ||
|
|
||
| // TODO this needs to be fixed when we start to support sending telemetry to different backends per namespace. | ||
| // Ultimately we need to derive one consistent configuration including multiple pipelines and routing across all | ||
| // monitored namespaces. | ||
| arbitraryMonitoringResource := allDash0MonitoringResouresInCluster.Items[0] | ||
|
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| err := r.BackendConnectionManager.EnsureOpenTelemetryCollectorIsDeployedInOperatorNamespace( | ||
| ctx, | ||
| r.Images, | ||
| r.OperatorNamespace, | ||
| &arbitraryMonitoringResource, | ||
| selfmonitoring.ReadSelfMonitoringConfigurationFromOperatorConfigurationResource(ctx, r.Client, &logger), | ||
| ) | ||
| if err != nil { | ||
| logger.Error(err, "Failed to create/update backend connection resources.") | ||
| return reconcile.Result{}, err | ||
| } | ||
|
|
||
| logger.Info( | ||
| "successfully reconciled backend connection resources", | ||
| "request", | ||
| request, | ||
| ) | ||
|
|
||
| return reconcile.Result{}, nil | ||
| } |
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