/
controller.go
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/
controller.go
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// Copyright Project Contour 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.
package controller
import (
"context"
"fmt"
operatorv1alpha1 "github.com/projectsesame/sesame-operator/api/v1alpha1"
objutil "github.com/projectsesame/sesame-operator/internal/objects"
objcm "github.com/projectsesame/sesame-operator/internal/objects/configmap"
objds "github.com/projectsesame/sesame-operator/internal/objects/daemonset"
objdeploy "github.com/projectsesame/sesame-operator/internal/objects/deployment"
objjob "github.com/projectsesame/sesame-operator/internal/objects/job"
objns "github.com/projectsesame/sesame-operator/internal/objects/namespace"
objsvc "github.com/projectsesame/sesame-operator/internal/objects/service"
objsesame "github.com/projectsesame/sesame-operator/internal/objects/sesame"
retryable "github.com/projectsesame/sesame-operator/internal/retryableerror"
"github.com/projectsesame/sesame-operator/internal/status"
"github.com/projectsesame/sesame-operator/pkg/validation"
"github.com/go-logr/logr"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
const (
controllerName = "sesame_controller"
)
// Config holds all the things necessary for the controller to run.
type Config struct {
// SesameImage is the name of the Sesame container image.
SesameImage string
// EnvoyImage is the name of the Envoy container image.
EnvoyImage string
}
// reconciler reconciles a Sesame object.
type reconciler struct {
config Config
client client.Client
log logr.Logger
}
// New creates the sesame controller from mgr and cfg. The controller will be pre-configured
// to watch for Sesame objects across all namespaces.
func New(mgr manager.Manager, cfg Config) (controller.Controller, error) {
r := &reconciler{
config: cfg,
client: mgr.GetClient(),
log: ctrl.Log.WithName(controllerName),
}
c, err := controller.New(controllerName, mgr, controller.Options{Reconciler: r})
if err != nil {
return nil, err
}
if err := c.Watch(&source.Kind{Type: &operatorv1alpha1.Sesame{}}, &handler.EnqueueRequestForObject{}); err != nil {
return nil, err
}
// Watch the Sesame deployment and Envoy daemonset to properly surface Sesame status conditions.
if err := c.Watch(&source.Kind{Type: &appsv1.Deployment{}}, r.enqueueRequestForOwningSesame()); err != nil {
return nil, err
}
if err := c.Watch(&source.Kind{Type: &appsv1.DaemonSet{}}, r.enqueueRequestForOwningSesame()); err != nil {
return nil, err
}
return c, nil
}
// enqueueRequestForOwningSesame returns an event handler that maps events to
// objects containing Sesame owner labels.
func (r *reconciler) enqueueRequestForOwningSesame() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(a client.Object) []reconcile.Request {
labels := a.GetLabels()
ns, nsFound := labels[operatorv1alpha1.OwningSesameNsLabel]
name, nameFound := labels[operatorv1alpha1.OwningSesameNameLabel]
if nsFound && nameFound {
r.log.Info("queueing sesame", "namespace", ns, "name", name, "related", a.GetSelfLink())
return []reconcile.Request{
{
NamespacedName: types.NamespacedName{
Namespace: ns,
Name: name,
},
},
}
}
return []reconcile.Request{}
})
}
// Reconcile reconciles watched objects and attempts to make the current state of
// the object match the desired state.
func (r *reconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
_ = r.log.WithValues("sesame", req.NamespacedName)
r.log.Info("reconciling", "request", req)
// Only proceed if we can get the state of sesame.
Sesame := &operatorv1alpha1.Sesame{}
if err := r.client.Get(ctx, req.NamespacedName, Sesame); err != nil {
if errors.IsNotFound(err) {
// This means the sesame was already deleted/finalized and there are
// stale queue entries (or something edge triggering from a related
// resource that got deleted async).
r.log.Info("sesame not found; reconciliation will be skipped", "request", req)
return ctrl.Result{}, nil
}
// Error reading the object, so requeue the request.
return ctrl.Result{}, fmt.Errorf("failed to get sesame %s: %w", req, err)
}
// The sesame is safe to process, so ensure current state matches desired state.
desired := Sesame.ObjectMeta.DeletionTimestamp.IsZero()
if desired {
if err := validation.Sesame(ctx, r.client, Sesame); err != nil {
return ctrl.Result{}, fmt.Errorf("failed to validate sesame %s/%s: %w", Sesame.Namespace, Sesame.Name, err)
}
if !Sesame.IsFinalized() {
// Before doing anything with the sesame, ensure it has a finalizer
// so it can cleaned-up later.
if err := objsesame.EnsureFinalizer(ctx, r.client, Sesame); err != nil {
return ctrl.Result{}, err
}
r.log.Info("finalized sesame", "namespace", Sesame.Namespace, "name", Sesame.Name)
} else {
r.log.Info("sesame finalized", "namespace", Sesame.Namespace, "name", Sesame.Name)
if err := r.ensureSesame(ctx, Sesame); err != nil {
switch e := err.(type) {
case retryable.Error:
r.log.Error(e, "got retryable error; requeueing", "after", e.After())
return ctrl.Result{RequeueAfter: e.After()}, nil
default:
return ctrl.Result{}, err
}
}
r.log.Info("ensured sesame", "namespace", Sesame.Namespace, "name", Sesame.Name)
}
} else {
if err := r.ensureSesameDeleted(ctx, Sesame); err != nil {
switch e := err.(type) {
case retryable.Error:
r.log.Error(e, "got retryable error; requeueing", "after", e.After())
return ctrl.Result{RequeueAfter: e.After()}, nil
default:
return ctrl.Result{}, err
}
}
r.log.Info("deleted sesame", "namespace", Sesame.Namespace, "name", Sesame.Name)
}
return ctrl.Result{}, nil
}
// ensureSesame ensures all necessary resources exist for the given sesame.
func (r *reconciler) ensureSesame(ctx context.Context, Sesame *operatorv1alpha1.Sesame) error {
var errs []error
cli := r.client
handleResult := func(resource string, err error) {
if err != nil {
errs = append(errs, fmt.Errorf("failed to ensure %s for sesame %s/%s: %w", resource, Sesame.Namespace, Sesame.Name, err))
} else {
r.log.Info(fmt.Sprintf("ensured %s for sesame", resource), "namespace", Sesame.Namespace, "name", Sesame.Name)
}
}
syncSesameStatus := func() error {
if err := status.SyncSesame(ctx, cli, Sesame); err != nil {
errs = append(errs, fmt.Errorf("failed to sync status for sesame %s/%s: %w", Sesame.Namespace, Sesame.Name, err))
} else {
r.log.Info("synced status for sesame", "namespace", Sesame.Namespace, "name", Sesame.Name)
}
return retryable.NewMaybeRetryableAggregate(errs)
}
handleResult("namespace", objns.EnsureNamespace(ctx, cli, Sesame))
handleResult("rbac", objutil.EnsureRBAC(ctx, cli, Sesame))
if len(errs) > 0 {
return syncSesameStatus()
}
SesameImage := r.config.SesameImage
envoyImage := r.config.EnvoyImage
handleResult("configmap", objcm.EnsureConfigMap(ctx, cli, Sesame))
handleResult("job", objjob.EnsureJob(ctx, cli, Sesame, SesameImage))
handleResult("deployment", objdeploy.EnsureDeployment(ctx, cli, Sesame, SesameImage))
handleResult("daemonset", objds.EnsureDaemonSet(ctx, cli, Sesame, SesameImage, envoyImage))
handleResult("sesame service", objsvc.EnsureSesameService(ctx, cli, Sesame))
switch Sesame.Spec.NetworkPublishing.Envoy.Type {
case operatorv1alpha1.LoadBalancerServicePublishingType, operatorv1alpha1.NodePortServicePublishingType, operatorv1alpha1.ClusterIPServicePublishingType:
handleResult("envoy service", objsvc.EnsureEnvoyService(ctx, cli, Sesame))
}
return syncSesameStatus()
}
// ensureSesameDeleted ensures sesame and all child resources have been deleted.
func (r *reconciler) ensureSesameDeleted(ctx context.Context, Sesame *operatorv1alpha1.Sesame) error {
var errs []error
cli := r.client
handleResult := func(resource string, err error) {
if err != nil {
errs = append(errs, fmt.Errorf("failed to delete %s for sesame %s/%s: %w", resource, Sesame.Namespace, Sesame.Name, err))
} else {
r.log.Info(fmt.Sprintf("deleted %s for sesame", resource), "namespace", Sesame.Namespace, "name", Sesame.Name)
}
}
switch Sesame.Spec.NetworkPublishing.Envoy.Type {
case operatorv1alpha1.LoadBalancerServicePublishingType, operatorv1alpha1.NodePortServicePublishingType, operatorv1alpha1.ClusterIPServicePublishingType:
handleResult("envoy service", objsvc.EnsureEnvoyServiceDeleted(ctx, cli, Sesame))
}
handleResult("service", objsvc.EnsureSesameServiceDeleted(ctx, cli, Sesame))
handleResult("daemonset", objds.EnsureDaemonSetDeleted(ctx, cli, Sesame))
handleResult("deployment", objdeploy.EnsureDeploymentDeleted(ctx, cli, Sesame))
handleResult("job", objjob.EnsureJobDeleted(ctx, cli, Sesame))
handleResult("configmap", objcm.EnsureConfigMapDeleted(ctx, cli, Sesame))
handleResult("rbac", objutil.EnsureRBACDeleted(ctx, cli, Sesame))
if deleteExpected, err := objns.EnsureNamespaceDeleted(ctx, cli, Sesame); deleteExpected {
handleResult("namespace", err)
} else {
r.log.Info("bypassing namespace deletion", "namespace", Sesame.Namespace, "name", Sesame.Name)
}
if len(errs) == 0 {
if err := objsesame.EnsureFinalizerRemoved(ctx, cli, Sesame); err != nil {
errs = append(errs, fmt.Errorf("failed to remove finalizer from sesame %s/%s: %w", Sesame.Namespace, Sesame.Name, err))
} else {
r.log.Info("removed finalizer from sesame", "namespace", Sesame.Namespace, "name", Sesame.Name)
}
}
return utilerrors.NewAggregate(errs)
}