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gateway.go
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gateway.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package gateway_api
import (
"context"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
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/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
gatewayv1beta1 "sigs.k8s.io/gateway-api/apis/v1beta1"
"github.com/cilium/cilium/pkg/logging/logfields"
)
const (
owningGatewayLabel = "io.cilium.gateway/owning-gateway"
lastTransitionTime = "LastTransitionTime"
)
// gatewayReconciler reconciles a Gateway object
type gatewayReconciler struct {
client.Client
Scheme *runtime.Scheme
SecretsNamespace string
controllerName string
Model *internalModel
}
// SetupWithManager sets up the controller with the Manager.
// The reconciler will be triggered by Gateway, or any cilium-managed GatewayClass events
func (r *gatewayReconciler) SetupWithManager(mgr ctrl.Manager) error {
hasMatchingControllerFn := hasMatchingController(context.Background(), r.Client, r.controllerName)
return ctrl.NewControllerManagedBy(mgr).
// Watch its own resource
For(&gatewayv1beta1.Gateway{},
builder.WithPredicates(predicate.NewPredicateFuncs(hasMatchingControllerFn))).
// Watch GatewayClass resources, which are linked to Gateway
Watches(&source.Kind{Type: &gatewayv1beta1.GatewayClass{}},
r.enqueueRequestForOwningGatewayClass(),
builder.WithPredicates(predicate.NewPredicateFuncs(hasMatchingControllerFn))).
// Watch related LB service for status
Watches(&source.Kind{Type: &corev1.Service{}},
r.enqueueRequestForOwningResource(),
builder.WithPredicates(predicate.NewPredicateFuncs(func(object client.Object) bool {
_, found := object.GetLabels()[owningGatewayLabel]
return found
}))).
// Watch HTTP Route status changes, there is one assumption that any change in spec will
// always update status always at least for observedGeneration value.
Watches(&source.Kind{Type: &gatewayv1beta1.HTTPRoute{}},
r.enqueueRequestForOwningHTTPRoute(),
builder.WithPredicates(onlyStatusChanged())).
// Watch related secrets used to configure TLS
Watches(&source.Kind{Type: &corev1.Secret{}}, r.enqueueRequestForTLSSecret(),
builder.WithPredicates(predicate.NewPredicateFuncs(r.usedInGateway))).
// Watch related namespace in allowed namespaces
Watches(&source.Kind{Type: &corev1.Namespace{}}, r.enqueueRequestForAllowedNamespace()).
Complete(r)
}
// enqueueRequestForOwningGatewayClass returns an event handler for all Gateway objects
// belonging to the given GatewayClass.
func (r *gatewayReconciler) enqueueRequestForOwningGatewayClass() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(a client.Object) []reconcile.Request {
scopedLog := log.WithFields(logrus.Fields{
logfields.Controller: gateway,
logfields.Resource: a.GetName(),
})
var reqs []reconcile.Request
gwList := &gatewayv1beta1.GatewayList{}
if err := r.Client.List(context.Background(), gwList); err != nil {
scopedLog.Error("Unable to list Gateways")
return nil
}
for _, gw := range gwList.Items {
if gw.Spec.GatewayClassName != gatewayv1beta1.ObjectName(a.GetName()) {
continue
}
req := reconcile.Request{
NamespacedName: types.NamespacedName{
Namespace: gw.Namespace,
Name: gw.Name,
},
}
reqs = append(reqs, req)
scopedLog.WithFields(logrus.Fields{
logfields.K8sNamespace: gw.GetNamespace(),
logfields.Resource: gw.GetName(),
}).Info("Queueing gateway")
}
return reqs
})
}
// enqueueRequestForOwningResource returns an event handler for all Gateway objects having
// owningGatewayLabel
func (r *gatewayReconciler) enqueueRequestForOwningResource() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(a client.Object) []reconcile.Request {
scopedLog := log.WithFields(logrus.Fields{
logfields.Controller: "gateway",
logfields.Resource: a.GetName(),
})
key, found := a.GetLabels()[owningGatewayLabel]
if !found {
return nil
}
scopedLog.WithFields(logrus.Fields{
logfields.K8sNamespace: a.GetNamespace(),
logfields.Resource: a.GetName(),
"gateway": key,
}).Info("Enqueued gateway for owning service")
return []reconcile.Request{
{
NamespacedName: types.NamespacedName{
Namespace: a.GetNamespace(),
Name: key,
},
},
}
})
}
// enqueueRequestForOwningHTTPRoute returns an event handler for any changes with HTTP Routes
// belonging to the given Gateway
func (r *gatewayReconciler) enqueueRequestForOwningHTTPRoute() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(a client.Object) []reconcile.Request {
scopedLog := log.WithFields(logrus.Fields{
logfields.Controller: gateway,
logfields.Resource: a.GetName(),
})
var reqs []reconcile.Request
hr, ok := a.(*gatewayv1beta1.HTTPRoute)
if !ok {
return nil
}
for _, parent := range hr.Spec.ParentRefs {
if !IsGateway(parent) {
continue
}
gw := &gatewayv1beta1.Gateway{}
if err := r.Client.Get(context.Background(), types.NamespacedName{
Namespace: namespaceDerefOr(parent.Namespace, a.GetNamespace()),
Name: string(parent.Name),
}, gw); err != nil {
if !k8serrors.IsNotFound(err) {
scopedLog.WithError(err).Error("Failed to get Gateway")
}
continue
}
if !hasMatchingController(context.Background(), r.Client, controllerName)(gw) {
scopedLog.Debug("Gateway does not have matching controller, skipping")
continue
}
ns := namespaceDerefOr(parent.Namespace, hr.GetNamespace())
scopedLog.WithFields(logrus.Fields{
logfields.K8sNamespace: ns,
logfields.Resource: parent.Name,
httpRoute: hr.GetName(),
}).Info("Enqueued gateway for HTTPRoute")
reqs = append(reqs, reconcile.Request{
NamespacedName: types.NamespacedName{
Namespace: ns,
Name: string(parent.Name),
},
})
}
return reqs
})
}
// enqueueRequestForOwningTLSCertificate returns an event handler for any changes with TLS secrets
func (r *gatewayReconciler) enqueueRequestForTLSSecret() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(a client.Object) []reconcile.Request {
gateways := getGatewaysForSecret(context.Background(), r.Client, a)
reqs := make([]reconcile.Request, 0, len(gateways))
for _, gw := range gateways {
reqs = append(reqs, reconcile.Request{
NamespacedName: gw,
})
}
return reqs
})
}
// enqueueRequestForAllowedNamespace returns an event handler for any changes
// with allowed namespaces
func (r *gatewayReconciler) enqueueRequestForAllowedNamespace() handler.EventHandler {
return handler.EnqueueRequestsFromMapFunc(func(ns client.Object) []reconcile.Request {
gateways := getGatewaysForNamespace(context.Background(), r.Client, ns)
reqs := make([]reconcile.Request, 0, len(gateways))
for _, gw := range gateways {
reqs = append(reqs, reconcile.Request{
NamespacedName: gw,
})
}
return reqs
})
}
func (r *gatewayReconciler) usedInGateway(obj client.Object) bool {
return len(getGatewaysForSecret(context.Background(), r.Client, obj)) > 0
}