/
controller.go
302 lines (267 loc) · 10.5 KB
/
controller.go
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package controlplane
import (
"context"
"fmt"
"sync"
"time"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/discovery"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
"github.com/maistra/istio-operator/pkg/apis/maistra/status"
v2 "github.com/maistra/istio-operator/pkg/apis/maistra/v2"
"github.com/maistra/istio-operator/pkg/controller/common"
"github.com/maistra/istio-operator/pkg/controller/common/cni"
"github.com/maistra/istio-operator/pkg/controller/hacks"
)
const (
controllerName = "servicemeshcontrolplane-controller"
)
// Add creates a new ControlPlane Controller and adds it to the Manager. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(mgr manager.Manager) error {
operatorNamespace := common.GetOperatorNamespace()
cniConfig, err := cni.InitConfig(mgr)
if err != nil {
return err
}
dcProvider, ok := mgr.(common.DiscoveryClientProvider)
if !ok {
return fmt.Errorf("expected mgr to be a DiscoveryClientProvider")
}
dc, err := dcProvider.GetDiscoveryClient()
if err != nil {
return err
}
reconciler := newReconciler(mgr.GetClient(), mgr.GetScheme(), mgr.GetEventRecorderFor(controllerName), operatorNamespace, cniConfig, dc)
return add(mgr, reconciler)
}
// newReconciler returns a new reconcile.Reconciler
func newReconciler(cl client.Client, scheme *runtime.Scheme, eventRecorder record.EventRecorder, operatorNamespace string,
cniConfig cni.Config, dc discovery.DiscoveryInterface,
) *ControlPlaneReconciler {
reconciler := &ControlPlaneReconciler{
ControllerResources: common.ControllerResources{
Client: cl,
Scheme: scheme,
EventRecorder: eventRecorder,
OperatorNamespace: operatorNamespace,
DiscoveryClient: dc,
},
cniConfig: cniConfig,
earliestReconciliationTimes: map[types.NamespacedName]time.Time{},
reconcilers: map[types.NamespacedName]ControlPlaneInstanceReconciler{},
}
reconciler.instanceReconcilerFactory = NewControlPlaneInstanceReconciler
return reconciler
}
// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r *ControlPlaneReconciler) error {
log := createLogger()
ctx := common.NewContextWithLog(common.NewContext(), log)
wrappedReconciler := common.NewConflictHandlingReconciler(r)
// Create a new controller
var c controller.Controller
var err error
if c, err = controller.New(controllerName, mgr,
controller.Options{
MaxConcurrentReconciles: common.Config.Controller.ControlPlaneReconcilers,
Reconciler: wrappedReconciler,
}); err != nil {
return err
}
// Watch for changes to primary resource ServiceMeshControlPlane
if err = c.Watch(&source.Kind{Type: &v2.ServiceMeshControlPlane{}}, &handler.EnqueueRequestForObject{}); err != nil {
return err
}
// watch created resources for use in synchronizing ready status
if err = c.Watch(&source.Kind{Type: &appsv1.Deployment{}}, enqueueRequestForSMCP, ownedResourcePredicates); err != nil {
return err
}
if err = c.Watch(&source.Kind{Type: &appsv1.StatefulSet{}}, enqueueRequestForSMCP, ownedResourcePredicates); err != nil {
return err
}
if err = c.Watch(&source.Kind{Type: &appsv1.DaemonSet{}}, enqueueRequestForSMCP, ownedResourcePredicates); err != nil {
return err
}
// add watch for cni daemon set
operatorNamespace := common.GetOperatorNamespace()
if err = c.Watch(&source.Kind{Type: &appsv1.DaemonSet{}},
&handler.EnqueueRequestsFromMapFunc{
ToRequests: handler.ToRequestsFunc(func(obj handler.MapObject) []reconcile.Request {
if obj.Meta.GetNamespace() != operatorNamespace {
return nil
}
smcpList := &v2.ServiceMeshControlPlaneList{}
if err := mgr.GetClient().List(ctx, smcpList); err != nil {
log.Error(err, "error listing ServiceMeshControlPlane objects in CNI DaemonSet watcher")
return nil
}
requests := make([]reconcile.Request, 0, len(smcpList.Items))
for _, smcp := range smcpList.Items {
requests = append(requests, reconcile.Request{
NamespacedName: common.ToNamespacedName(&smcp),
})
}
return requests
}),
},
ownedResourcePredicates); err != nil {
return err
}
return nil
}
var enqueueRequestForSMCP = &handler.EnqueueRequestsFromMapFunc{
ToRequests: handler.ToRequestsFunc(func(obj handler.MapObject) []reconcile.Request {
labels := obj.Meta.GetLabels()
if labels[common.KubernetesAppManagedByKey] == common.KubernetesAppManagedByValue {
ownerNamespace := labels[common.OwnerKey]
ownerName := labels[common.OwnerNameKey]
if ownerNamespace != "" && ownerName != "" {
return []reconcile.Request{{NamespacedName: types.NamespacedName{
Namespace: ownerNamespace,
Name: ownerName,
}}}
}
}
return nil
}),
}
var ownedResourcePredicates = predicate.Funcs{
CreateFunc: func(_ event.CreateEvent) bool {
// we don't need to update status on create events
return false
},
GenericFunc: func(_ event.GenericEvent) bool {
// we don't need to update status on generic events
return false
},
}
var _ reconcile.Reconciler = &ControlPlaneReconciler{}
// ControlPlaneReconciler handles reconciliation of ServiceMeshControlPlane
// objects. It creates a ControlPlaneInstanceReconciler for each instance.
type ControlPlaneReconciler struct {
// This client, initialized using mgr.Client() above, is a split client
// that reads objects from the cache and writes to the apiserver
common.ControllerResources
cniConfig cni.Config
earliestReconciliationTimes map[types.NamespacedName]time.Time
reconcilers map[types.NamespacedName]ControlPlaneInstanceReconciler
mu sync.Mutex
instanceReconcilerFactory func(common.ControllerResources, *v2.ServiceMeshControlPlane, cni.Config) ControlPlaneInstanceReconciler
}
// ControlPlaneInstanceReconciler reconciles a specific instance of a ServiceMeshControlPlane
type ControlPlaneInstanceReconciler interface {
Reconcile(ctx context.Context) (reconcile.Result, error)
UpdateReadiness(ctx context.Context) error
PatchAddons(ctx context.Context, spec *v2.ControlPlaneSpec) (reconcile.Result, error)
Delete(ctx context.Context) error
SetInstance(instance *v2.ServiceMeshControlPlane)
IsFinished() bool
}
// Reconcile reads that state of the cluster for a ServiceMeshControlPlane object and makes changes based on the state read
// and what is in the ServiceMeshControlPlane.Spec
func (r *ControlPlaneReconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
log := createLogger().WithValues("ServiceMeshControlPlane", request)
ctx := common.NewReconcileContext(log)
if earliestReconciliationTime, ok := r.earliestReconciliationTimes[request.NamespacedName]; ok {
if earliestReconciliationTime.After(time.Now()) {
log.Info("Skipping reconciliation of ServiceMeshControlPlane because reconciliation is paused")
return reconcile.Result{
Requeue: true,
RequeueAfter: time.Until(earliestReconciliationTime),
}, nil
}
delete(r.earliestReconciliationTimes, request.NamespacedName)
}
ctx = hacks.WrapContext(ctx, r.earliestReconciliationTimes)
log.Info("Processing ServiceMeshControlPlane")
defer func() {
log.Info("Completed ServiceMeshControlPlane processing")
}()
// Fetch the ServiceMeshControlPlane instance
instance := &v2.ServiceMeshControlPlane{}
err := r.Client.Get(ctx, request.NamespacedName, instance)
if err != nil {
if errors.IsNotFound(err) {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
log.Info("ServiceMeshControlPlane deleted")
delete(r.earliestReconciliationTimes, request.NamespacedName)
return reconcile.Result{}, nil
}
// Error reading the object
return reconcile.Result{}, err
}
key, reconciler := r.getOrCreateReconciler(instance)
defer r.deleteReconcilerIfFinished(key, reconciler)
deleted := instance.GetDeletionTimestamp() != nil
finalizers := sets.NewString(instance.Finalizers...)
if deleted {
if !finalizers.Has(common.FinalizerName) {
log.Info("Deletion of ServiceMeshControlPlane complete")
return reconcile.Result{}, nil
}
err := reconciler.Delete(ctx)
return reconcile.Result{}, err
} else if !finalizers.Has(common.FinalizerName) {
log.V(1).Info("Adding finalizer", "finalizer", common.FinalizerName)
finalizers.Insert(common.FinalizerName)
instance.SetFinalizers(finalizers.List())
err = r.Client.Update(ctx, instance)
return reconcile.Result{}, err
}
if isFullyReconciled(instance) {
if err := reconciler.UpdateReadiness(ctx); err != nil {
return common.RequeueWithError(err)
}
return reconciler.PatchAddons(ctx, &instance.Spec)
}
return reconciler.Reconcile(ctx)
}
func isFullyReconciled(instance *v2.ServiceMeshControlPlane) bool {
return status.CurrentReconciledVersion(instance.GetGeneration()) == instance.Status.GetReconciledVersion() &&
instance.Status.GetCondition(status.ConditionTypeReconciled).Status == status.ConditionStatusTrue
}
func (r *ControlPlaneReconciler) getOrCreateReconciler(newInstance *v2.ServiceMeshControlPlane) (types.NamespacedName, ControlPlaneInstanceReconciler) {
r.mu.Lock()
defer r.mu.Unlock()
key := common.ToNamespacedName(newInstance)
if reconciler, ok := r.reconcilers[key]; ok {
reconciler.SetInstance(newInstance)
return key, reconciler
}
newReconciler := r.instanceReconcilerFactory(r.ControllerResources, newInstance, r.cniConfig)
r.reconcilers[key] = newReconciler
return key, newReconciler
}
func (r *ControlPlaneReconciler) deleteReconcilerIfFinished(key types.NamespacedName, reconciler ControlPlaneInstanceReconciler) {
if reconciler == nil {
return
}
if reconciler.IsFinished() {
r.mu.Lock()
defer r.mu.Unlock()
delete(r.reconcilers, key)
}
}
// Don't use this function to obtain a logger. Get it by invoking
// common.LogFromContext(ctx) to ensure that the logger has the
// correct context info and logs it.
func createLogger() logr.Logger {
return logf.Log.WithName(controllerName)
}