/
hostsubnet_controller.go
263 lines (216 loc) · 7.98 KB
/
hostsubnet_controller.go
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package hostsubnet
//goland:noinspection SpellCheckingInspection
import (
"fmt"
"github.com/go-logr/logr"
"github.com/klenkes74/aws-egressip-operator/pkg/cloudprovider"
"github.com/klenkes74/aws-egressip-operator/pkg/logger"
"github.com/klenkes74/aws-egressip-operator/pkg/observability"
"github.com/klenkes74/aws-egressip-operator/pkg/openshift"
corev1 "github.com/openshift/api/network/v1"
"github.com/redhat-cop/operator-utils/pkg/util"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
"net"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"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"
)
//goland:noinspection SpellCheckingInspection
const controllerName = "hostsubnet-controller"
//goland:noinspection SpellCheckingInspection
const finalizerName = "egressip-ipam-operator.redhat-cop.io/hostsubnet-handler"
var log = logger.Log.WithName(controllerName)
var _ reconcile.Reconciler = &reconcileHostSubnet{}
//goland:noinspection SpellCheckingInspection
type reconcileHostSubnet struct {
util.ReconcilerBase
cloud cloudprovider.CloudProvider
handler openshift.EgressIPHandler
alarming observability.AlarmStore
}
// Add creates a new Namespace 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, cloud *cloudprovider.CloudProvider) error {
log.Info(fmt.Sprintf("Adding reconciler '%s' to operator manager", controllerName))
return add(mgr, newReconciler(mgr, cloud))
}
// newReconciler returns a new reconcile.
func newReconciler(mgr manager.Manager, cloud *cloudprovider.CloudProvider) reconcile.Reconciler {
return &reconcileHostSubnet{
ReconcilerBase: util.NewReconcilerBase(mgr.GetClient(), mgr.GetScheme(), mgr.GetConfig(), mgr.GetEventRecorderFor(controllerName)),
cloud: *cloud,
handler: *openshift.NewEgressIPHandler(*cloud, *openshift.NewOcpClient(mgr.GetClient())),
alarming: *observability.NewAlarmStore(),
}
}
// add adds a new Controller to mgr with r as the reconcile.r
func add(mgr manager.Manager, r reconcile.Reconciler) error {
// Create a new controller
c, err := controller.New(controllerName, mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
needsReconciliation := predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool {
return true
},
UpdateFunc: func(e event.UpdateEvent) bool {
return util.IsBeingDeleted(e.MetaNew)
},
DeleteFunc: func(e event.DeleteEvent) bool {
return true
},
GenericFunc: func(e event.GenericEvent) bool {
return false
},
}
// Watch for changes to primary resource Namespace
err = c.Watch(&source.Kind{Type: &corev1.HostSubnet{}}, &handler.EnqueueRequestForObject{}, needsReconciliation)
if err != nil {
return err
}
return nil
}
// Reconcile - the workhorse of the operator ...
func (r *reconcileHostSubnet) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("instance", request.Name)
reqLogger.Info("Reconciling hostSubnet")
instance, done, err := r.loadHostSubnet(request.NamespacedName, reqLogger)
if done {
reqLogger.Info("stop reconcilation of hostSubnet")
return reconcile.Result{}, nil
}
if err != nil {
reqLogger.Error(err, "other error - reconcile again")
return reconcile.Result{}, err
}
var changed bool
if !util.IsBeingDeleted(instance) {
changed, err = r.updateHostSubnet(instance, reqLogger, changed)
if err != nil {
return reconcile.Result{}, err
}
} else {
changed, err = r.deleteHostSubnet(instance, reqLogger, changed)
if err != nil {
for _, ip := range instance.EgressIPs {
namespace := instance.GetAnnotations()[openshift.IPToNamespaceAnnotation+ip]
alarmIP := net.ParseIP(ip)
r.alarming.AddAlarm(namespace, []*net.IP{&alarmIP})
}
return reconcile.Result{}, err
}
}
if changed {
err = r.handler.SaveHostSubnet(instance)
if err != nil {
reqLogger.Error(err, "could not save hostSubnet")
return reconcile.Result{}, err
}
}
return reconcile.Result{}, nil
}
func (r *reconcileHostSubnet) updateHostSubnet(instance *corev1.HostSubnet, reqLogger logr.Logger, changed bool) (bool, error) {
ips := r.handler.ReadIpsFromHostSubnet(instance)
changed = r.addFinalizer(instance, reqLogger) || changed
err := r.handler.CheckIPsForHost(instance, ips)
if err != nil {
reqLogger.Error(err, "problems with IPs. need to redistribute IPs")
_, err = r.handler.RedistributeIPsFromHost(instance)
if err != nil {
r.raiseAlarmForIPs(instance, ips)
} else {
r.cancelAlarmforIPs(instance, ips)
}
changed = true
}
return changed, err
}
func (r *reconcileHostSubnet) loadHostSubnet(name types.NamespacedName, reqLogger logr.Logger) (*corev1.HostSubnet, bool, error) {
// Fetch the Namespace instance
instance, err := r.handler.LoadHostSubnet(name.Name)
if err != nil {
if errors.IsNotFound(err) {
reqLogger.Error(err, "can not find the object. Is already deleted. Don't requeue this request")
// 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
return nil, true, nil
}
reqLogger.Error(err, "can not load the object. Requeue the request")
// Error reading the object - requeue the request.
return nil, false, err
}
if util.IsBeingDeleted(instance) && !util.HasFinalizer(instance, finalizerName) {
reqLogger.Info("deleted object has no finalizer - ignoring it.")
return instance, true, nil
}
return instance, false, nil
}
func (r *reconcileHostSubnet) deleteHostSubnet(instance *corev1.HostSubnet, reqLogger logr.Logger, changed bool) (bool, error) {
ips := r.handler.ReadIpsFromHostSubnet(instance)
reqLogger.Info("reconciling deleted host subnet",
"ips", ips,
)
if len(ips) == 0 {
reqLogger.Info("no ipaddresses to redistribute from hostsubnet")
} else {
reqLogger.Info("Redistributing ipaddresses of hostsubnet",
"ips", ips,
)
distribution, err := r.handler.RedistributeIPsFromHost(instance)
if err != nil {
reqLogger.Error(err,
"redistribution of IPs failed. Egress networking will cease working for projects if the other hosts are also failing",
"hostname", instance.Name,
"egress-ips", ips,
)
r.raiseAlarmForIPs(instance, ips)
return changed, err
}
r.cancelAlarmforIPs(instance, ips)
for ip, host := range distribution {
reqLogger.Info("redistributed IP",
"ip", ip,
"host", host,
)
}
}
r.removeFinalizer(instance, reqLogger)
return true, nil
}
// adds the finalizer for egressip handling to the list of finalizers if it is not already listed.
func (r *reconcileHostSubnet) addFinalizer(instance *corev1.HostSubnet, reqLogger logr.Logger) bool {
found := util.HasFinalizer(instance, finalizerName)
if !found {
reqLogger.Info("adding finalizer to hostSubnet")
util.AddFinalizer(instance, finalizerName)
}
return !found
}
// removes the finalizer from the list of finalizers on the node
func (r *reconcileHostSubnet) removeFinalizer(instance *corev1.HostSubnet, reqLogger logr.Logger) bool {
result := util.HasFinalizer(instance, finalizerName)
if result {
reqLogger.Info("removing finalizer from hostSubnet")
util.RemoveFinalizer(instance, finalizerName)
}
return result
}
func (r *reconcileHostSubnet) raiseAlarmForIPs(instance *corev1.HostSubnet, ips []*net.IP) {
for _, ip := range ips {
namespace := instance.GetAnnotations()[openshift.IPToNamespaceAnnotation+ip.String()]
r.alarming.AddAlarm(namespace, []*net.IP{ip})
}
}
func (r *reconcileHostSubnet) cancelAlarmforIPs(instance *corev1.HostSubnet, ips []*net.IP) {
for _, ip := range ips {
namespace := instance.GetAnnotations()[openshift.IPToNamespaceAnnotation+ip.String()]
r.alarming.RemoveAlarmForIP(namespace, ip)
}
}