|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "os" |
| 6 | + "strings" |
| 7 | + "sync" |
| 8 | + "time" |
| 9 | + |
| 10 | + corev1 "k8s.io/api/core/v1" |
| 11 | + "k8s.io/apimachinery/pkg/util/sets" |
| 12 | + "k8s.io/apimachinery/pkg/watch" |
| 13 | + "k8s.io/client-go/tools/clientcmd" |
| 14 | + "k8s.io/klog/v2" |
| 15 | + ctrl "sigs.k8s.io/controller-runtime" |
| 16 | + "sigs.k8s.io/controller-runtime/pkg/builder" |
| 17 | + "sigs.k8s.io/controller-runtime/pkg/cluster" |
| 18 | + "sigs.k8s.io/controller-runtime/pkg/envtest" |
| 19 | + "sigs.k8s.io/controller-runtime/pkg/log" |
| 20 | + "sigs.k8s.io/controller-runtime/pkg/manager" |
| 21 | + "sigs.k8s.io/controller-runtime/pkg/manager/signals" |
| 22 | + "sigs.k8s.io/controller-runtime/pkg/reconcile" |
| 23 | + kind "sigs.k8s.io/kind/pkg/cluster" |
| 24 | + "sigs.k8s.io/logical-cluster" |
| 25 | +) |
| 26 | + |
| 27 | +func init() { |
| 28 | + ctrl.SetLogger(klog.Background()) |
| 29 | +} |
| 30 | + |
| 31 | +func main() { |
| 32 | + entryLog := log.Log.WithName("entrypoint") |
| 33 | + |
| 34 | + testEnv := &envtest.Environment{} |
| 35 | + cfg, err := testEnv.Start() |
| 36 | + if err != nil { |
| 37 | + entryLog.Error(err, "failed to start local environment") |
| 38 | + os.Exit(1) |
| 39 | + } |
| 40 | + defer func() { |
| 41 | + if testEnv == nil { |
| 42 | + return |
| 43 | + } |
| 44 | + if err := testEnv.Stop(); err != nil { |
| 45 | + entryLog.Error(err, "failed to stop local environment") |
| 46 | + os.Exit(1) |
| 47 | + } |
| 48 | + }() |
| 49 | + |
| 50 | + // Setup a Manager |
| 51 | + entryLog.Info("Setting up manager") |
| 52 | + mgr, err := manager.New( |
| 53 | + cfg, |
| 54 | + manager.Options{}.WithExperimentalClusterProvider(&KindClusterProvider{}), |
| 55 | + ) |
| 56 | + if err != nil { |
| 57 | + entryLog.Error(err, "unable to set up overall controller manager") |
| 58 | + os.Exit(1) |
| 59 | + } |
| 60 | + |
| 61 | + builder.ControllerManagedBy(mgr). |
| 62 | + For(&corev1.Pod{}).Complete(reconcile.Func( |
| 63 | + func(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { |
| 64 | + log := log.FromContext(ctx) |
| 65 | + |
| 66 | + cluster, err := mgr.GetCluster(ctx, req.Cluster) |
| 67 | + if err != nil { |
| 68 | + return reconcile.Result{}, err |
| 69 | + } |
| 70 | + client := cluster.GetClient() |
| 71 | + |
| 72 | + // Retrieve the pod from the cluster. |
| 73 | + pod := &corev1.Pod{} |
| 74 | + if err := client.Get(ctx, req.NamespacedName, pod); err != nil { |
| 75 | + return reconcile.Result{}, err |
| 76 | + } |
| 77 | + log.Info("Reconciling pod", "name", pod.Name, "uuid", pod.UID) |
| 78 | + |
| 79 | + // Print any annotations that start with fleet. |
| 80 | + for k, v := range pod.Labels { |
| 81 | + if strings.HasPrefix(k, "fleet-") { |
| 82 | + log.Info("Detected fleet annotation!", "key", k, "value", v) |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + return ctrl.Result{}, nil |
| 87 | + }, |
| 88 | + )) |
| 89 | + |
| 90 | + entryLog.Info("Starting manager") |
| 91 | + if err := mgr.Start(signals.SetupSignalHandler()); err != nil { |
| 92 | + entryLog.Error(err, "unable to run manager") |
| 93 | + os.Exit(1) |
| 94 | + } |
| 95 | +} |
| 96 | + |
| 97 | +// KindClusterProvider is a cluster provider that works with a local Kind instance. |
| 98 | +type KindClusterProvider struct{} |
| 99 | + |
| 100 | +func (k *KindClusterProvider) Get(ctx context.Context, name logical.Name, opts ...cluster.Option) (cluster.Cluster, error) { |
| 101 | + provider := kind.NewProvider() |
| 102 | + kubeconfig, err := provider.KubeConfig(string(name), false) |
| 103 | + if err != nil { |
| 104 | + return nil, err |
| 105 | + } |
| 106 | + // Parse the kubeconfig into a rest.Config. |
| 107 | + cfg, err := clientcmd.RESTConfigFromKubeConfig([]byte(kubeconfig)) |
| 108 | + if err != nil { |
| 109 | + return nil, err |
| 110 | + } |
| 111 | + return cluster.New(cfg, opts...) |
| 112 | +} |
| 113 | + |
| 114 | +func (k *KindClusterProvider) List() ([]logical.Name, error) { |
| 115 | + provider := kind.NewProvider() |
| 116 | + list, err := provider.List() |
| 117 | + if err != nil { |
| 118 | + return nil, err |
| 119 | + } |
| 120 | + res := make([]logical.Name, 0, len(list)) |
| 121 | + for _, cluster := range list { |
| 122 | + if !strings.HasPrefix(cluster, "fleet-") { |
| 123 | + continue |
| 124 | + } |
| 125 | + res = append(res, logical.Name(cluster)) |
| 126 | + } |
| 127 | + return res, nil |
| 128 | +} |
| 129 | + |
| 130 | +func (k *KindClusterProvider) Watch() (cluster.Watcher, error) { |
| 131 | + return &KindWatcher{ch: make(chan cluster.WatchEvent)}, nil |
| 132 | +} |
| 133 | + |
| 134 | +type KindWatcher struct { |
| 135 | + init sync.Once |
| 136 | + wg sync.WaitGroup |
| 137 | + ch chan cluster.WatchEvent |
| 138 | + cancel context.CancelFunc |
| 139 | +} |
| 140 | + |
| 141 | +func (k *KindWatcher) Stop() { |
| 142 | + if k.cancel != nil { |
| 143 | + k.cancel() |
| 144 | + } |
| 145 | + k.wg.Wait() |
| 146 | + close(k.ch) |
| 147 | +} |
| 148 | +func (k *KindWatcher) ResultChan() <-chan cluster.WatchEvent { |
| 149 | + k.init.Do(func() { |
| 150 | + ctx, cancel := context.WithCancel(context.Background()) |
| 151 | + k.cancel = cancel |
| 152 | + set := sets.New[string]() |
| 153 | + k.wg.Add(1) |
| 154 | + go func() { |
| 155 | + defer k.wg.Done() |
| 156 | + for { |
| 157 | + select { |
| 158 | + case <-time.After(2 * time.Second): |
| 159 | + provider := kind.NewProvider() |
| 160 | + list, err := provider.List() |
| 161 | + if err != nil { |
| 162 | + klog.Error(err) |
| 163 | + continue |
| 164 | + } |
| 165 | + newSet := sets.New(list...) |
| 166 | + // Check for new clusters. |
| 167 | + for _, cl := range newSet.Difference(set).UnsortedList() { |
| 168 | + if !strings.HasPrefix(cl, "fleet-") { |
| 169 | + continue |
| 170 | + } |
| 171 | + k.ch <- cl.WatchEvent{ |
| 172 | + Type: watch.Added, |
| 173 | + Name: logical.Name(cl), |
| 174 | + } |
| 175 | + } |
| 176 | + // Check for deleted clusters. |
| 177 | + for _, cl := range set.Difference(newSet).UnsortedList() { |
| 178 | + if !strings.HasPrefix(cl, "fleet-") { |
| 179 | + continue |
| 180 | + } |
| 181 | + k.ch <- cluster.WatchEvent{ |
| 182 | + Type: watch.Deleted, |
| 183 | + Name: logical.Name(cl), |
| 184 | + } |
| 185 | + } |
| 186 | + set = newSet |
| 187 | + case <-ctx.Done(): |
| 188 | + return |
| 189 | + } |
| 190 | + } |
| 191 | + }() |
| 192 | + }) |
| 193 | + return k.ch |
| 194 | +} |
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