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service_controller.go
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package service
import (
"context"
"fmt"
"sigs.k8s.io/aws-load-balancer-controller/pkg/shared_constants"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"github.com/go-logr/logr"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/aws-load-balancer-controller/controllers/service/eventhandlers"
"sigs.k8s.io/aws-load-balancer-controller/pkg/annotations"
"sigs.k8s.io/aws-load-balancer-controller/pkg/aws/services"
"sigs.k8s.io/aws-load-balancer-controller/pkg/config"
"sigs.k8s.io/aws-load-balancer-controller/pkg/deploy"
elbv2deploy "sigs.k8s.io/aws-load-balancer-controller/pkg/deploy/elbv2"
"sigs.k8s.io/aws-load-balancer-controller/pkg/deploy/tracking"
errmetrics "sigs.k8s.io/aws-load-balancer-controller/pkg/error"
"sigs.k8s.io/aws-load-balancer-controller/pkg/k8s"
lbcmetrics "sigs.k8s.io/aws-load-balancer-controller/pkg/metrics/lbc"
metricsutil "sigs.k8s.io/aws-load-balancer-controller/pkg/metrics/util"
"sigs.k8s.io/aws-load-balancer-controller/pkg/model/core"
elbv2model "sigs.k8s.io/aws-load-balancer-controller/pkg/model/elbv2"
"sigs.k8s.io/aws-load-balancer-controller/pkg/networking"
"sigs.k8s.io/aws-load-balancer-controller/pkg/runtime"
"sigs.k8s.io/aws-load-balancer-controller/pkg/service"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
)
const (
serviceTagPrefix = "service.k8s.aws"
serviceAnnotationPrefix = "service.beta.kubernetes.io"
controllerName = "service"
)
func NewServiceReconciler(cloud services.Cloud, k8sClient client.Client, eventRecorder record.EventRecorder,
finalizerManager k8s.FinalizerManager, networkingSGManager networking.SecurityGroupManager,
networkingSGReconciler networking.SecurityGroupReconciler, subnetsResolver networking.SubnetsResolver,
vpcInfoProvider networking.VPCInfoProvider, elbv2TaggingManager elbv2deploy.TaggingManager, controllerConfig config.ControllerConfig,
backendSGProvider networking.BackendSGProvider, sgResolver networking.SecurityGroupResolver, logger logr.Logger, metricsCollector lbcmetrics.MetricCollector, reconcileCounters *metricsutil.ReconcileCounters) *serviceReconciler {
annotationParser := annotations.NewSuffixAnnotationParser(serviceAnnotationPrefix)
trackingProvider := tracking.NewDefaultProvider(serviceTagPrefix, controllerConfig.ClusterName)
serviceUtils := service.NewServiceUtils(annotationParser, shared_constants.ServiceFinalizer, controllerConfig.ServiceConfig.LoadBalancerClass, controllerConfig.FeatureGates)
modelBuilder := service.NewDefaultModelBuilder(annotationParser, subnetsResolver, vpcInfoProvider, cloud.VpcID(), trackingProvider,
elbv2TaggingManager, cloud.EC2(), controllerConfig.FeatureGates, controllerConfig.ClusterName, controllerConfig.DefaultTags, controllerConfig.ExternalManagedTags,
controllerConfig.DefaultSSLPolicy, controllerConfig.DefaultTargetType, controllerConfig.DefaultLoadBalancerScheme, controllerConfig.FeatureGates.Enabled(config.EnableIPTargetType), serviceUtils,
backendSGProvider, sgResolver, controllerConfig.EnableBackendSecurityGroup, controllerConfig.EnableManageBackendSecurityGroupRules, controllerConfig.DisableRestrictedSGRules, logger, metricsCollector)
stackMarshaller := deploy.NewDefaultStackMarshaller()
stackDeployer := deploy.NewDefaultStackDeployer(cloud, k8sClient, networkingSGManager, networkingSGReconciler, elbv2TaggingManager, controllerConfig, serviceTagPrefix, logger, metricsCollector, controllerName)
return &serviceReconciler{
k8sClient: k8sClient,
eventRecorder: eventRecorder,
finalizerManager: finalizerManager,
annotationParser: annotationParser,
loadBalancerClass: controllerConfig.ServiceConfig.LoadBalancerClass,
serviceUtils: serviceUtils,
backendSGProvider: backendSGProvider,
modelBuilder: modelBuilder,
stackMarshaller: stackMarshaller,
stackDeployer: stackDeployer,
logger: logger,
maxConcurrentReconciles: controllerConfig.ServiceMaxConcurrentReconciles,
metricsCollector: metricsCollector,
reconcileCounters: reconcileCounters,
}
}
type serviceReconciler struct {
k8sClient client.Client
eventRecorder record.EventRecorder
finalizerManager k8s.FinalizerManager
annotationParser annotations.Parser
loadBalancerClass string
serviceUtils service.ServiceUtils
backendSGProvider networking.BackendSGProvider
modelBuilder service.ModelBuilder
stackMarshaller deploy.StackMarshaller
stackDeployer deploy.StackDeployer
logger logr.Logger
metricsCollector lbcmetrics.MetricCollector
reconcileCounters *metricsutil.ReconcileCounters
maxConcurrentReconciles int
}
// +kubebuilder:rbac:groups="",resources=services,verbs=get;list;watch;update;patch
// +kubebuilder:rbac:groups="",resources=services/status,verbs=update;patch
// +kubebuilder:rbac:groups="",resources=events,verbs=create;patch
func (r *serviceReconciler) Reconcile(ctx context.Context, req reconcile.Request) (ctrl.Result, error) {
r.reconcileCounters.IncrementService(req.NamespacedName)
return runtime.HandleReconcileError(r.reconcile(ctx, req), r.logger)
}
func (r *serviceReconciler) reconcile(ctx context.Context, req reconcile.Request) error {
svc := &corev1.Service{}
var err error
fetchServiceFn := func() {
err = r.k8sClient.Get(ctx, req.NamespacedName, svc)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "fetch_service", fetchServiceFn)
if err != nil {
return client.IgnoreNotFound(err)
}
var stack core.Stack
var lb *elbv2model.LoadBalancer
var backendSGRequired bool
buildModelFn := func() {
stack, lb, backendSGRequired, err = r.buildModel(ctx, svc)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "build_model", buildModelFn)
if err != nil {
return errmetrics.NewErrorWithMetrics(controllerName, "build_model_error", err, r.metricsCollector)
}
if lb == nil {
cleanupLoadBalancerFn := func() {
err = r.cleanupLoadBalancerResources(ctx, svc, stack)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "cleanup_load_balancer", cleanupLoadBalancerFn)
if err != nil {
return errmetrics.NewErrorWithMetrics(controllerName, "cleanup_load_balancer_error", err, r.metricsCollector)
}
}
return r.reconcileLoadBalancerResources(ctx, svc, stack, lb, backendSGRequired)
}
func (r *serviceReconciler) buildModel(ctx context.Context, svc *corev1.Service) (core.Stack, *elbv2model.LoadBalancer, bool, error) {
stack, lb, backendSGRequired, err := r.modelBuilder.Build(ctx, svc, r.metricsCollector)
if err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedBuildModel, fmt.Sprintf("Failed build model due to %v", err))
return nil, nil, false, err
}
stackJSON, err := r.stackMarshaller.Marshal(stack)
if err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedBuildModel, fmt.Sprintf("Failed build model due to %v", err))
return nil, nil, false, err
}
r.logger.Info("successfully built model", "model", stackJSON)
return stack, lb, backendSGRequired, nil
}
func (r *serviceReconciler) deployModel(ctx context.Context, svc *corev1.Service, stack core.Stack) error {
if err := r.stackDeployer.Deploy(ctx, stack, r.metricsCollector, "service"); err != nil {
var requeueNeededAfter *runtime.RequeueNeededAfter
if errors.As(err, &requeueNeededAfter) {
return err
}
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedDeployModel, fmt.Sprintf("Failed deploy model due to %v", err))
return err
}
r.logger.Info("successfully deployed model", "service", k8s.NamespacedName(svc))
return nil
}
func (r *serviceReconciler) reconcileLoadBalancerResources(ctx context.Context, svc *corev1.Service, stack core.Stack,
lb *elbv2model.LoadBalancer, backendSGRequired bool) error {
var err error
addFinalizersFn := func() {
err = r.finalizerManager.AddFinalizers(ctx, svc, shared_constants.ServiceFinalizer)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "add_finalizers", addFinalizersFn)
if err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedAddFinalizer, fmt.Sprintf("Failed add finalizer due to %v", err))
return errmetrics.NewErrorWithMetrics(controllerName, "add_finalizers_error", err, r.metricsCollector)
}
deployModelFn := func() {
err = r.deployModel(ctx, svc, stack)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "deploy_model", deployModelFn)
if err != nil {
return errmetrics.NewErrorWithMetrics(controllerName, "deploy_model_error", err, r.metricsCollector)
}
var lbDNS string
dnsResolveFn := func() {
lbDNS, err = lb.DNSName().Resolve(ctx)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "DNS_resolve", dnsResolveFn)
if err != nil {
return errmetrics.NewErrorWithMetrics(controllerName, "dns_resolve_error", err, r.metricsCollector)
}
if !backendSGRequired {
if err := r.backendSGProvider.Release(ctx, networking.ResourceTypeService, []types.NamespacedName{k8s.NamespacedName(svc)}); err != nil {
return errmetrics.NewErrorWithMetrics(controllerName, "release_auto_generated_backend_sg_error", err, r.metricsCollector)
}
}
updateStatusFn := func() {
err = r.updateServiceStatus(ctx, lbDNS, svc)
}
r.metricsCollector.ObserveControllerReconcileLatency(controllerName, "update_status", updateStatusFn)
if err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedUpdateStatus, fmt.Sprintf("Failed update status due to %v", err))
return errmetrics.NewErrorWithMetrics(controllerName, "update_status_error", err, r.metricsCollector)
}
r.eventRecorder.Event(svc, corev1.EventTypeNormal, k8s.ServiceEventReasonSuccessfullyReconciled, "Successfully reconciled")
return nil
}
func (r *serviceReconciler) cleanupLoadBalancerResources(ctx context.Context, svc *corev1.Service, stack core.Stack) error {
if k8s.HasFinalizer(svc, shared_constants.ServiceFinalizer) {
err := r.deployModel(ctx, svc, stack)
if err != nil {
return err
}
if err := r.backendSGProvider.Release(ctx, networking.ResourceTypeService, []types.NamespacedName{k8s.NamespacedName(svc)}); err != nil {
return err
}
if err = r.cleanupServiceStatus(ctx, svc); err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedCleanupStatus, fmt.Sprintf("Failed update status due to %v", err))
return err
}
if err := r.finalizerManager.RemoveFinalizers(ctx, svc, shared_constants.ServiceFinalizer); err != nil {
r.eventRecorder.Event(svc, corev1.EventTypeWarning, k8s.ServiceEventReasonFailedRemoveFinalizer, fmt.Sprintf("Failed remove finalizer due to %v", err))
return err
}
}
return nil
}
func (r *serviceReconciler) updateServiceStatus(ctx context.Context, lbDNS string, svc *corev1.Service) error {
if len(svc.Status.LoadBalancer.Ingress) != 1 ||
svc.Status.LoadBalancer.Ingress[0].IP != "" ||
svc.Status.LoadBalancer.Ingress[0].Hostname != lbDNS {
svcOld := svc.DeepCopy()
svc.Status.LoadBalancer.Ingress = []corev1.LoadBalancerIngress{
{
Hostname: lbDNS,
},
}
if err := r.k8sClient.Status().Patch(ctx, svc, client.MergeFrom(svcOld)); err != nil {
return errors.Wrapf(err, "failed to update service status: %v", k8s.NamespacedName(svc))
}
}
return nil
}
func (r *serviceReconciler) cleanupServiceStatus(ctx context.Context, svc *corev1.Service) error {
svcOld := svc.DeepCopy()
svc.Status.LoadBalancer = corev1.LoadBalancerStatus{}
if err := r.k8sClient.Status().Patch(ctx, svc, client.MergeFrom(svcOld)); err != nil {
return errors.Wrapf(err, "failed to cleanup service status: %v", k8s.NamespacedName(svc))
}
return nil
}
func (r *serviceReconciler) SetupWithManager(ctx context.Context, mgr ctrl.Manager) error {
svcEventHandler := eventhandlers.NewEnqueueRequestForServiceEvent(r.eventRecorder,
r.serviceUtils, r.logger.WithName("eventHandlers").WithName("service"))
return ctrl.NewControllerManagedBy(mgr).
Named(controllerName).
Watches(&corev1.Service{}, svcEventHandler).
WithOptions(controller.Options{
MaxConcurrentReconciles: r.maxConcurrentReconciles,
}).
Complete(r)
}