104 lines
3.1 KiB
Go
104 lines
3.1 KiB
Go
/*
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Copyright 2026.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"context"
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"errors"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/runtime"
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ctrl "sigs.k8s.io/controller-runtime"
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"sigs.k8s.io/controller-runtime/pkg/client"
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logf "sigs.k8s.io/controller-runtime/pkg/log"
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dnsv1 "stinnesbeck.com/dns/api/v1"
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)
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var (
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ErrIPAddressNotValid = errors.New("IP Address is not valid")
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)
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// ResolverReconciler reconciles a Resolver object
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type ResolverReconciler struct {
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client.Client
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Scheme *runtime.Scheme
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}
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// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers/status,verbs=get;update;patch
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// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolvers/finalizers,verbs=update
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// Reconcile is part of the main kubernetes reconciliation loop which aims to
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// move the current state of the cluster closer to the desired state.
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// TODO(user): Modify the Reconcile function to compare the state specified by
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// the Resolver object against the actual cluster state, and then
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// perform operations to make the cluster state reflect the state specified by
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// the user.
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//
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// For more details, check Reconcile and its Result here:
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// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.23.3/pkg/reconcile
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func (r *ResolverReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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log := logf.FromContext(ctx)
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var resolver dnsv1.Resolver
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switch err := r.Get(ctx, req.NamespacedName, &resolver); {
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case apierrors.IsNotFound(err):
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// resolver was deleted, this is expected
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// exit reconcile loop here
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return ctrl.Result{}, nil
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case err != nil:
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// an error occurred this is not expected
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log.Error(err, "error while retrieving resolver")
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return ctrl.Result{}, err
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}
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switch {
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case len(resolver.Spec.IPAddress) == 0:
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// IPAddress is not a valid IP
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return ctrl.Result{}, ErrIPAddressNotValid
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case len(resolver.Spec.IPAddress.To4()) == 4:
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// IP is IPv4
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case len(resolver.Spec.IPAddress.To16()) == 16:
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// IP is IPv6
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}
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// exit loop here if port was provided
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if resolver.Spec.Port != 0 {
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return ctrl.Result{}, nil
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}
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// set defaults and patch it back to k8s
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resolver.Spec.Port = 53
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if err := r.Patch(ctx, &resolver, client.Merge); err != nil {
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return ctrl.Result{}, err
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}
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return ctrl.Result{}, nil
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}
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// SetupWithManager sets up the controller with the Manager.
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func (r *ResolverReconciler) SetupWithManager(mgr ctrl.Manager) error {
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return ctrl.NewControllerManagedBy(mgr).
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For(&dnsv1.Resolver{}).
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Named("resolver").
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Complete(r)
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}
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