147 lines
4.0 KiB
Go
147 lines
4.0 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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"bytes"
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"context"
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"fmt"
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"net"
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"slices"
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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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// ResolutionReconciler reconciles a Resolution object
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type ResolutionReconciler 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=resolutions,verbs=get;list;watch;create;update;patch;delete
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// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolutions/status,verbs=get;update;patch
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// +kubebuilder:rbac:groups=dns.stinnesbeck.com,resources=resolutions/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 Resolution 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 *ResolutionReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
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log := logf.FromContext(ctx)
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var resolution dnsv1.Resolution
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switch err := r.Get(ctx, req.NamespacedName, &resolution); {
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case apierrors.IsNotFound(err):
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// resolution 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 resolution")
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return ctrl.Result{}, err
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}
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// Snapshot before mutation
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patchBase := resolution.DeepCopy()
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addrs, err := net.LookupHost(resolution.Spec.Address)
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if err != nil {
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log.Error(err, "error while resolving resolution")
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return ctrl.Result{}, err
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}
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// Build new desired status (IMPORTANT: no append)
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var ips []net.IP
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for _, addr := range addrs {
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if ip := net.ParseIP(addr); ip != nil {
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ips = append(ips, ip)
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}
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}
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slices.SortStableFunc(ips, func(a, b net.IP) int {
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for i := range 15 {
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if a[i] < b[i] {
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return -1
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}
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if a[i] > b[i] {
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return 1
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}
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}
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return 0
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})
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// check if both ip address slices are the same
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if slices.EqualFunc(patchBase.Status.IPAddresses, ips, func(s1, s2 net.IP) bool {
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return bytes.Equal(s1, s2)
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}) {
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return ctrl.Result{}, nil
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}
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log.Info(fmt.Sprintf("found the following IP addresses: %v", ips))
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resolution.Status.IPAddresses = ips
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// Only patch status (clean + minimal diff)
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if err := r.Status().Patch(
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ctx,
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&resolution,
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client.MergeFrom(patchBase),
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); 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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// if err := r.Patch(ctx, &resolution, client.Merge); err != nil {
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// return ctrl.Result{}, err
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// }
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// r := &net.Resolver{
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// PreferGo: true,
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// Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
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// d := net.Dialer{
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// Timeout: time.Millisecond * time.Duration(10000),
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// }
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// return d.DialContext(ctx, network, "8.8.8.8:53")
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// },
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// }
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// ip, _ := r.LookupHost(context.Background(), "www.google.com")
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}
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// SetupWithManager sets up the controller with the Manager.
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func (r *ResolutionReconciler) SetupWithManager(mgr ctrl.Manager) error {
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return ctrl.NewControllerManagedBy(mgr).
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For(&dnsv1.Resolution{}).
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Named("resolution").
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Complete(r)
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}
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