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WIP: ✨ Cluster Provider and cluster-aware controllers #2207
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| module sigs.k8s.io/controller-runtime/examples/fleet | ||
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| go 1.19 | ||
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| replace sigs.k8s.io/controller-runtime => ../.. | ||
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| require ( | ||
| k8s.io/api v0.26.1 | ||
| k8s.io/apimachinery v0.26.1 | ||
| k8s.io/client-go v0.26.1 | ||
| k8s.io/klog/v2 v2.90.0 | ||
| sigs.k8s.io/controller-runtime v0.0.0-00010101000000-000000000000 | ||
| sigs.k8s.io/kind v0.17.0 | ||
| sigs.k8s.io/logical-cluster v0.0.1-alpha.0 | ||
| ) | ||
|
|
||
| require ( | ||
| github.com/BurntSushi/toml v1.0.0 // indirect | ||
| github.com/alessio/shellescape v1.4.1 // indirect | ||
| github.com/beorn7/perks v1.0.1 // indirect | ||
| github.com/cespare/xxhash/v2 v2.1.2 // indirect | ||
| github.com/davecgh/go-spew v1.1.1 // indirect | ||
| github.com/emicklei/go-restful/v3 v3.9.0 // indirect | ||
| github.com/evanphx/json-patch/v5 v5.6.0 // indirect | ||
| github.com/fsnotify/fsnotify v1.6.0 // indirect | ||
| github.com/go-logr/logr v1.2.3 // indirect | ||
| github.com/go-openapi/jsonpointer v0.19.5 // indirect | ||
| github.com/go-openapi/jsonreference v0.20.0 // indirect | ||
| github.com/go-openapi/swag v0.19.14 // indirect | ||
| github.com/gogo/protobuf v1.3.2 // indirect | ||
| github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect | ||
| github.com/golang/protobuf v1.5.2 // indirect | ||
| github.com/google/gnostic v0.5.7-v3refs // indirect | ||
| github.com/google/go-cmp v0.5.9 // indirect | ||
| github.com/google/gofuzz v1.1.0 // indirect | ||
| github.com/google/safetext v0.0.0-20220905092116-b49f7bc46da2 // indirect | ||
| github.com/google/uuid v1.1.2 // indirect | ||
| github.com/imdario/mergo v0.3.6 // indirect | ||
| github.com/inconshreveable/mousetrap v1.0.1 // indirect | ||
| github.com/josharian/intern v1.0.0 // indirect | ||
| github.com/json-iterator/go v1.1.12 // indirect | ||
| github.com/mailru/easyjson v0.7.6 // indirect | ||
| github.com/mattn/go-isatty v0.0.14 // indirect | ||
| github.com/matttproud/golang_protobuf_extensions v1.0.2 // indirect | ||
| github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect | ||
| github.com/modern-go/reflect2 v1.0.2 // indirect | ||
| github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect | ||
| github.com/pelletier/go-toml v1.9.4 // indirect | ||
| github.com/pkg/errors v0.9.1 // indirect | ||
| github.com/prometheus/client_golang v1.14.0 // indirect | ||
| github.com/prometheus/client_model v0.3.0 // indirect | ||
| github.com/prometheus/common v0.37.0 // indirect | ||
| github.com/prometheus/procfs v0.8.0 // indirect | ||
| github.com/spf13/cobra v1.6.0 // indirect | ||
| github.com/spf13/pflag v1.0.5 // indirect | ||
| golang.org/x/net v0.7.0 // indirect | ||
| golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect | ||
| golang.org/x/sys v0.5.0 // indirect | ||
| golang.org/x/term v0.5.0 // indirect | ||
| golang.org/x/text v0.7.0 // indirect | ||
| golang.org/x/time v0.3.0 // indirect | ||
| gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect | ||
| google.golang.org/appengine v1.6.7 // indirect | ||
| google.golang.org/protobuf v1.28.1 // indirect | ||
| gopkg.in/inf.v0 v0.9.1 // indirect | ||
| gopkg.in/yaml.v2 v2.4.0 // indirect | ||
| gopkg.in/yaml.v3 v3.0.1 // indirect | ||
| k8s.io/apiextensions-apiserver v0.26.1 // indirect | ||
| k8s.io/component-base v0.26.1 // indirect | ||
| k8s.io/kube-openapi v0.0.0-20221012153701-172d655c2280 // indirect | ||
| k8s.io/utils v0.0.0-20221128185143-99ec85e7a448 // indirect | ||
| sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect | ||
| sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect | ||
| sigs.k8s.io/yaml v1.3.0 // indirect | ||
| ) |
Large diffs are not rendered by default.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package main | ||
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| import ( | ||
| "context" | ||
| "os" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
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||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/util/sets" | ||
| "k8s.io/apimachinery/pkg/watch" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "k8s.io/klog/v2" | ||
| ctrl "sigs.k8s.io/controller-runtime" | ||
| "sigs.k8s.io/controller-runtime/pkg/builder" | ||
| "sigs.k8s.io/controller-runtime/pkg/cluster" | ||
| "sigs.k8s.io/controller-runtime/pkg/envtest" | ||
| "sigs.k8s.io/controller-runtime/pkg/log" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager/signals" | ||
| "sigs.k8s.io/controller-runtime/pkg/reconcile" | ||
| kind "sigs.k8s.io/kind/pkg/cluster" | ||
| "sigs.k8s.io/logical-cluster" | ||
| ) | ||
|
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| func init() { | ||
| ctrl.SetLogger(klog.Background()) | ||
| } | ||
|
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| func main() { | ||
| entryLog := log.Log.WithName("entrypoint") | ||
|
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| testEnv := &envtest.Environment{} | ||
| cfg, err := testEnv.Start() | ||
| if err != nil { | ||
| entryLog.Error(err, "failed to start local environment") | ||
| os.Exit(1) | ||
| } | ||
| defer func() { | ||
| if testEnv == nil { | ||
| return | ||
| } | ||
| if err := testEnv.Stop(); err != nil { | ||
| entryLog.Error(err, "failed to stop local environment") | ||
| os.Exit(1) | ||
| } | ||
| }() | ||
|
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| // Setup a Manager | ||
| entryLog.Info("Setting up manager") | ||
| mgr, err := manager.New( | ||
| cfg, | ||
| manager.Options{}.WithExperimentalClusterProvider(&KindClusterProvider{}), | ||
| ) | ||
| if err != nil { | ||
| entryLog.Error(err, "unable to set up overall controller manager") | ||
| os.Exit(1) | ||
| } | ||
|
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| builder.ControllerManagedBy(mgr). | ||
| For(&corev1.Pod{}).Complete(reconcile.Func( | ||
| func(ctx context.Context, req ctrl.Request) (ctrl.Result, error) { | ||
| log := log.FromContext(ctx) | ||
|
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| cluster, err := mgr.GetCluster(ctx, req.Cluster) | ||
| if err != nil { | ||
| return reconcile.Result{}, err | ||
| } | ||
| client := cluster.GetClient() | ||
|
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| // Retrieve the pod from the cluster. | ||
| pod := &corev1.Pod{} | ||
| if err := client.Get(ctx, req.NamespacedName, pod); err != nil { | ||
| return reconcile.Result{}, err | ||
| } | ||
| log.Info("Reconciling pod", "name", pod.Name, "uuid", pod.UID) | ||
|
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| // Print any annotations that start with fleet. | ||
| for k, v := range pod.Labels { | ||
| if strings.HasPrefix(k, "fleet-") { | ||
| log.Info("Detected fleet annotation!", "key", k, "value", v) | ||
| } | ||
| } | ||
|
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| return ctrl.Result{}, nil | ||
| }, | ||
| )) | ||
|
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| entryLog.Info("Starting manager") | ||
| if err := mgr.Start(signals.SetupSignalHandler()); err != nil { | ||
| entryLog.Error(err, "unable to run manager") | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
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| // KindClusterProvider is a cluster provider that works with a local Kind instance. | ||
| type KindClusterProvider struct{} | ||
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| func (k *KindClusterProvider) Get(ctx context.Context, name logical.Name, opts ...cluster.Option) (cluster.Cluster, error) { | ||
| provider := kind.NewProvider() | ||
| kubeconfig, err := provider.KubeConfig(string(name), false) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // Parse the kubeconfig into a rest.Config. | ||
| cfg, err := clientcmd.RESTConfigFromKubeConfig([]byte(kubeconfig)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return cluster.New(cfg, opts...) | ||
| } | ||
|
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| func (k *KindClusterProvider) List() ([]logical.Name, error) { | ||
| provider := kind.NewProvider() | ||
| list, err := provider.List() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| res := make([]logical.Name, 0, len(list)) | ||
| for _, cluster := range list { | ||
| if !strings.HasPrefix(cluster, "fleet-") { | ||
| continue | ||
| } | ||
| res = append(res, logical.Name(cluster)) | ||
| } | ||
| return res, nil | ||
| } | ||
|
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| func (k *KindClusterProvider) Watch() (cluster.Watcher, error) { | ||
| return &KindWatcher{ch: make(chan cluster.WatchEvent)}, nil | ||
| } | ||
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| type KindWatcher struct { | ||
| init sync.Once | ||
| wg sync.WaitGroup | ||
| ch chan cluster.WatchEvent | ||
| cancel context.CancelFunc | ||
| } | ||
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| func (k *KindWatcher) Stop() { | ||
| if k.cancel != nil { | ||
| k.cancel() | ||
| } | ||
| k.wg.Wait() | ||
| close(k.ch) | ||
| } | ||
| func (k *KindWatcher) ResultChan() <-chan cluster.WatchEvent { | ||
| k.init.Do(func() { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| k.cancel = cancel | ||
| set := sets.New[string]() | ||
| k.wg.Add(1) | ||
| go func() { | ||
| defer k.wg.Done() | ||
| for { | ||
| select { | ||
| case <-time.After(2 * time.Second): | ||
| provider := kind.NewProvider() | ||
| list, err := provider.List() | ||
| if err != nil { | ||
| klog.Error(err) | ||
| continue | ||
| } | ||
| newSet := sets.New(list...) | ||
| // Check for new clusters. | ||
| for _, cl := range newSet.Difference(set).UnsortedList() { | ||
| if !strings.HasPrefix(cl, "fleet-") { | ||
| continue | ||
| } | ||
| k.ch <- cl.WatchEvent{ | ||
|
sbueringer marked this conversation as resolved.
Resolved
|
||
| Type: watch.Added, | ||
| Name: logical.Name(cl), | ||
| } | ||
| } | ||
| // Check for deleted clusters. | ||
| for _, cl := range set.Difference(newSet).UnsortedList() { | ||
| if !strings.HasPrefix(cl, "fleet-") { | ||
| continue | ||
| } | ||
| k.ch <- cluster.WatchEvent{ | ||
| Type: watch.Deleted, | ||
| Name: logical.Name(cl), | ||
| } | ||
| } | ||
| set = newSet | ||
| case <-ctx.Done(): | ||
| return | ||
| } | ||
| } | ||
| }() | ||
| }) | ||
| return k.ch | ||
| } | ||
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Q: Might it be better if we end up with something like logicalcluster.Name or logical.ClusterName
Also in field names of structs like Builder:
vs.
or if we want something shorter
(Might be good to consistently stick with the same naming, e.g. Cluster is a Cluster, ClusterName is a logicalcluster.Name, mixing it up might lead to a bit of confusion, e.g. with req.Cluster)
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IMO we should rename the repo to
sigs.k8s.io/logicalclusterand change the package name tologicalclustertoo. I also likeclusterNameas a short-hand for variables of typelogicalcluster.Name.@nikhita how would we do a repo rename?
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Alternative, as suggested in other comments: get rid of the alias altogether and just use string. Am undecided. Have done that now locally in this branch. We lose type-safety, and replace it with naming convention of calling every formally logical cluster name
clusterName.