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operator_controller.go
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/
operator_controller.go
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package operators
import (
"context"
"fmt"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
kscheme "k8s.io/client-go/kubernetes/scheme"
apiregistrationv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/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/handler"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
operatorsv1 "github.com/operator-framework/api/pkg/operators/v1"
operatorsv1alpha1 "github.com/operator-framework/api/pkg/operators/v1alpha1"
operatorsv2 "github.com/operator-framework/api/pkg/operators/v2"
"github.com/operator-framework/operator-lifecycle-manager/pkg/controller/operators/decorators"
"github.com/operator-framework/operator-lifecycle-manager/pkg/metrics"
)
var (
localSchemeBuilder = runtime.NewSchemeBuilder(
kscheme.AddToScheme,
apiextensionsv1.AddToScheme,
apiregistrationv1.AddToScheme,
operatorsv1alpha1.AddToScheme,
operatorsv1.AddToScheme,
operatorsv2.AddToScheme,
)
// AddToScheme adds all types necessary for the controller to operate.
AddToScheme = localSchemeBuilder.AddToScheme
)
// OperatorReconciler reconciles a Operator object.
type OperatorReconciler struct {
client.Client
log logr.Logger
factory decorators.OperatorFactory
}
// +kubebuilder:rbac:groups=operators.coreos.com,resources=operators,verbs=create;update;patch;delete
// +kubebuilder:rbac:groups=operators.coreos.com,resources=operators/status,verbs=update;patch
// +kubebuilder:rbac:groups=*,resources=*,verbs=get;list;watch
// SetupWithManager adds the operator reconciler to the given controller manager.
func (r *OperatorReconciler) SetupWithManager(mgr ctrl.Manager) error {
// Trigger operator events from the events of their compoenents.
enqueueOperator := handler.EnqueueRequestsFromMapFunc(r.mapComponentRequests)
// Note: If we want to support resources composed of custom resources, we need to figure out how
// to dynamically add resource types to watch.
return ctrl.NewControllerManagedBy(mgr).
For(&operatorsv1.Operator{}).
Watches(&appsv1.Deployment{}, enqueueOperator).
Watches(&corev1.Namespace{}, enqueueOperator).
Watches(&apiextensionsv1.CustomResourceDefinition{}, enqueueOperator).
Watches(&apiregistrationv1.APIService{}, enqueueOperator).
Watches(&operatorsv1alpha1.Subscription{}, enqueueOperator).
Watches(&operatorsv1alpha1.InstallPlan{}, enqueueOperator).
Watches(&operatorsv1alpha1.ClusterServiceVersion{}, enqueueOperator).
Watches(&operatorsv2.OperatorCondition{}, enqueueOperator).
// Metadata is sufficient to build component refs for
// GVKs that don't have a .status.conditions field.
Watches(&corev1.ServiceAccount{}, enqueueOperator, builder.OnlyMetadata).
Watches(&corev1.Secret{}, enqueueOperator, builder.OnlyMetadata).
Watches(&corev1.ConfigMap{}, enqueueOperator, builder.OnlyMetadata).
Watches(&rbacv1.Role{}, enqueueOperator, builder.OnlyMetadata).
Watches(&rbacv1.RoleBinding{}, enqueueOperator, builder.OnlyMetadata).
Watches(&rbacv1.ClusterRole{}, enqueueOperator, builder.OnlyMetadata).
Watches(&rbacv1.ClusterRoleBinding{}, enqueueOperator, builder.OnlyMetadata).
// TODO(njhale): Add WebhookConfigurations
Complete(r)
}
// NewOperatorReconciler constructs and returns an OperatorReconciler.
// As a side effect, the given scheme has operator discovery types added to it.
func NewOperatorReconciler(cli client.Client, log logr.Logger, scheme *runtime.Scheme) (*OperatorReconciler, error) {
// Add watched types to scheme.
if err := AddToScheme(scheme); err != nil {
return nil, err
}
factory, err := decorators.NewSchemedOperatorFactory(scheme)
if err != nil {
return nil, err
}
return &OperatorReconciler{
Client: cli,
log: log,
factory: factory,
}, nil
}
// Implement reconcile.Reconciler so the controller can reconcile objects
var _ reconcile.Reconciler = &OperatorReconciler{}
func (r *OperatorReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
// Set up a convenient log object so we don't have to type request over and over again
log := r.log.WithValues("request", req)
log.V(1).Info("reconciling operator")
metrics.EmitOperatorReconcile(req.Namespace, req.Name)
// Get the Operator
create := false
name := req.NamespacedName.Name
in := &operatorsv1.Operator{}
if err := r.Get(ctx, req.NamespacedName, in); err != nil {
if apierrors.IsNotFound(err) {
// If the Operator instance is not found, we're likely reconciling because
// of a DELETE event. Only recreate the Operator if any of its components
// still exist.
if exists, err := r.hasExistingComponents(ctx, name); err != nil || !exists {
return reconcile.Result{}, err
}
create = true
in.SetName(name)
} else {
log.Error(err, "Error requesting Operator")
return reconcile.Result{Requeue: true}, nil
}
}
// Wrap with convenience decorator
operator, err := r.factory.NewOperator(in)
if err != nil {
log.Error(err, "Could not wrap Operator with convenience decorator")
return reconcile.Result{Requeue: true}, nil
}
if err = r.updateComponents(ctx, operator); err != nil {
log.Error(err, "Could not update components")
return reconcile.Result{Requeue: true}, nil
}
if create {
if err := r.Create(context.Background(), operator.Operator); err != nil && !apierrors.IsAlreadyExists(err) {
r.log.Error(err, "Could not create Operator", "operator", name)
return ctrl.Result{Requeue: true}, nil
}
} else {
if !equality.Semantic.DeepEqual(in.Status, operator.Operator.Status) {
if err := r.Status().Update(ctx, operator.Operator); err != nil {
log.Error(err, "Could not update Operator status")
return ctrl.Result{Requeue: true}, nil
}
}
}
return ctrl.Result{}, nil
}
func (r *OperatorReconciler) updateComponents(ctx context.Context, operator *decorators.Operator) error {
selector, err := operator.ComponentSelector()
if err != nil {
return err
}
components, err := r.listComponents(ctx, selector)
if err != nil {
return err
}
return operator.SetComponents(components...)
}
func (r *OperatorReconciler) listComponents(ctx context.Context, selector labels.Selector) ([]runtime.Object, error) {
// Note: We need to figure out how to dynamically add new list types here (or some equivalent) in
// order to support operators composed of custom resources.
componentLists := componentLists()
opt := client.MatchingLabelsSelector{Selector: selector}
for _, list := range componentLists {
cList, ok := list.(client.ObjectList)
if !ok {
return nil, fmt.Errorf("unable to typecast runtime.Object to client.ObjectList")
}
if err := r.List(ctx, cList, opt); err != nil {
return nil, err
}
}
return componentLists, nil
}
func (r *OperatorReconciler) hasExistingComponents(ctx context.Context, name string) (bool, error) {
op := &operatorsv1.Operator{}
op.SetName(name)
operator := decorators.Operator{Operator: op}
selector, err := operator.ComponentSelector()
if err != nil {
return false, err
}
components, err := r.listComponents(ctx, selector)
if err != nil {
return false, err
}
for _, list := range components {
items, err := meta.ExtractList(list)
if err != nil {
return false, fmt.Errorf("unable to extract list from runtime.Object")
}
if len(items) > 0 {
return true, nil
}
}
return false, nil
}
func (r *OperatorReconciler) mapComponentRequests(_ context.Context, obj client.Object) []reconcile.Request {
var requests []reconcile.Request
if obj == nil {
return requests
}
labels := decorators.OperatorNames(obj.GetLabels())
for _, name := range labels {
requests = append(requests, reconcile.Request{NamespacedName: name})
}
return requests
}