diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 6622779..5ebb38c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -27,6 +27,8 @@ jobs: - providers/cluster-api - examples/cluster-inventory-api - providers/cluster-inventory-api + - examples/file + - providers/file name: golangci-lint [${{ matrix.working-directory }}] steps: - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # tag=v5.0.0 diff --git a/examples/file/README.md b/examples/file/README.md new file mode 100644 index 0000000..b710ac2 --- /dev/null +++ b/examples/file/README.md @@ -0,0 +1,51 @@ +# file + +The file provider reads kubeconfig files from the local filesystem. + +It provides clusters named after the filepath and context name. + +This example lists configmaps in the clusters discovered by the file +provider. + +## Example + +With a single kind cluster (`kind-kind` defined in `~/.kube/config`: + +```bash +$ go run . -kubeconfig ~/.kube/config +2025-08-13T11:28:01+02:00 INFO file-cluster-provider file cluster provider initialized {"kubeconfigFiles": ["/home/user/.kube/config"], "kubeconfigDirs": [], "kubeconfigGlobs": [""]} +2025-08-13T11:28:01+02:00 INFO controller-runtime.metrics Starting metrics server +2025-08-13T11:28:01+02:00 INFO Starting Controller {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap"} +2025-08-13T11:28:01+02:00 INFO Starting workers {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "worker count": 1} +2025-08-13T11:28:01+02:00 INFO controller-runtime.metrics Serving metrics server {"bindAddress": ":8080", "secure": false} +2025-08-13T11:28:01+02:00 INFO file-cluster-provider adding cluster {"name": "/home/user/.kube/config+kind-kind"} +2025-08-13T11:28:01+02:00 INFO Starting EventSource {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "source": "func source: 0x172ca20"} +2025-08-13T11:28:01+02:00 INFO Reconciling ConfigMap {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "7096cf7e-f382-4f22-8d1b-bff768f99c07", "cluster": "/home/user/.kube/config+kind-kind"} +2025-08-13T11:28:01+02:00 INFO ConfigMap found {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "7096cf7e-f382-4f22-8d1b-bff768f99c07", "cluster": "/home/user/.kube/config+kind-kind", "namespace": "default", "name": "kube-root-ca.crt", "cluster": "/home/user/.kube/config+kind-kind"} +... +``` + +Then adding another kind cluster with `kind create cluster --name test`: + +```bash +2025-08-13T11:28:54+02:00 INFO file-cluster-provider received fsnotify event {"event": "\"/home/user/.kube/config.lock\": CREATE"} +2025-08-13T11:28:54+02:00 INFO file-cluster-provider received fsnotify event {"event": "\"/home/user/.kube/config\": WRITE"} +2025-08-13T11:28:54+02:00 INFO file-cluster-provider adding cluster {"name": "/home/user/.kube/config+kind-test"} +2025-08-13T11:28:54+02:00 INFO Starting EventSource {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "source": "func source: 0x172ca20"} +2025-08-13T11:28:54+02:00 INFO file-cluster-provider received fsnotify event {"event": "\"/home/user/.kube/config\": WRITE"} +2025-08-13T11:28:54+02:00 INFO file-cluster-provider received fsnotify event {"event": "\"/home/user/.kube/config.lock\": REMOVE"} +2025-08-13T11:28:54+02:00 INFO Reconciling ConfigMap {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "9d3e1e4b-b587-49b1-9fcf-a903f4e713f5", "cluster": "/home/user/.kube/config+kind-test"} +2025-08-13T11:28:54+02:00 INFO ConfigMap found {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "9d3e1e4b-b587-49b1-9fcf-a903f4e713f5", "cluster": "/home/user/.kube/config+kind-test", "namespace": "local-path-storage", "name": "local-path-config", "cluster": "/home/user/.kube/config+kind-test"} +... +``` + +Adding new configmaps to either cluster will trigger a reconcile: + +```bash +kubectl --context kind-test create configmap test --from-literal hello=word +``` + +```bash +2025-08-13T11:30:37+02:00 INFO Reconciling ConfigMap {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "56f49ce6-7ff8-4eb9-b3ac-ad7586265c6d", "cluster": "/home/user/.kube/config+kind-test"} +2025-08-13T11:30:37+02:00 INFO ConfigMap found {"controller": "multicluster-configmaps", "controllerGroup": "", "controllerKind": "ConfigMap", "reconcileID": "56f49ce6-7ff8-4eb9-b3ac-ad7586265c6d", "cluster": "/home/user/.kube/config+kind-test", "namespace": "default", "name": "test", "cluster": "/home/user/.kube/config+kind-test"} +``` diff --git a/examples/file/go.mod b/examples/file/go.mod new file mode 100644 index 0000000..ce07d90 --- /dev/null +++ b/examples/file/go.mod @@ -0,0 +1,76 @@ +module sigs.k8s.io/multicluster-runtime/examples/file + +go 1.24.0 + +replace ( + sigs.k8s.io/multicluster-runtime => ../.. + sigs.k8s.io/multicluster-runtime/providers/file => ../../providers/file +) + +require ( + sigs.k8s.io/multicluster-runtime v0.0.0-00010101000000-000000000000 + sigs.k8s.io/multicluster-runtime/providers/file v0.0.0-00010101000000-000000000000 +) + +require ( + golang.org/x/sync v0.16.0 + k8s.io/apimachinery v0.33.3 + sigs.k8s.io/controller-runtime v0.21.0 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/evanphx/json-patch/v5 v5.9.11 // indirect + github.com/fsnotify/fsnotify v1.7.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/zapr v1.3.0 // indirect + github.com/go-openapi/jsonpointer v0.21.0 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.23.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/google/btree v1.1.3 // indirect + github.com/google/gnostic-models v0.6.9 // indirect + github.com/google/go-cmp v0.7.0 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // 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/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.22.0 // indirect + github.com/prometheus/client_model v0.6.1 // indirect + github.com/prometheus/common v0.62.0 // indirect + github.com/prometheus/procfs v0.15.1 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + go.uber.org/multierr v1.11.0 // indirect + go.uber.org/zap v1.27.0 // indirect + golang.org/x/net v0.41.0 // indirect + golang.org/x/oauth2 v0.27.0 // indirect + golang.org/x/sys v0.33.0 // indirect + golang.org/x/term v0.32.0 // indirect + golang.org/x/text v0.26.0 // indirect + golang.org/x/time v0.9.0 // indirect + gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect + google.golang.org/protobuf v1.36.6 // indirect + gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect + gopkg.in/fsnotify.v1 v1.4.7 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/api v0.33.3 // indirect + k8s.io/apiextensions-apiserver v0.33.0 // indirect + k8s.io/client-go v0.33.3 // indirect + k8s.io/klog/v2 v2.130.1 // indirect + k8s.io/kube-openapi v0.0.0-20250318190949-c8a335a9a2ff // indirect + k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738 // indirect + sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 // indirect + sigs.k8s.io/randfill v1.0.0 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.6.0 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/examples/file/go.sum b/examples/file/go.sum new file mode 100644 index 0000000..996e1e9 --- /dev/null +++ b/examples/file/go.sum @@ -0,0 +1,201 @@ +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= +github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM= +github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ= +github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs= +github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/creack/pty v1.1.9/go.mod 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h1:OSg14+F65eWqIu4DceX7k/+QRAbTTvxeQSNSOQpukWM= +sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 h1:/Rv+M11QRah1itp8VhT6HoVx1Ray9eB4DBr+K+/sCJ8= +sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3/go.mod h1:18nIHnGi6636UCz6m8i4DhaJ65T6EruyzmoQqI2BVDo= +sigs.k8s.io/randfill v0.0.0-20250304075658-069ef1bbf016/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY= +sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU= +sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0 h1:IUA9nvMmnKWcj5jl84xn+T5MnlZKThmUW1TdblaLVAc= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0/go.mod h1:dDy58f92j70zLsuZVuUX5Wp9vtxXpaZnkPGWeqDfCps= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/examples/file/main.go b/examples/file/main.go new file mode 100644 index 0000000..edf99f7 --- /dev/null +++ b/examples/file/main.go @@ -0,0 +1,130 @@ +/* +Copyright 2025 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package main + +import ( + "context" + "errors" + "flag" + "strings" + + "golang.org/x/sync/errgroup" + + corev1 "k8s.io/api/core/v1" + apierrors "k8s.io/apimachinery/pkg/api/errors" + + ctrl "sigs.k8s.io/controller-runtime" + ctrllog "sigs.k8s.io/controller-runtime/pkg/log" + "sigs.k8s.io/controller-runtime/pkg/log/zap" + "sigs.k8s.io/controller-runtime/pkg/manager/signals" + "sigs.k8s.io/controller-runtime/pkg/reconcile" + + mcbuilder "sigs.k8s.io/multicluster-runtime/pkg/builder" + mcmanager "sigs.k8s.io/multicluster-runtime/pkg/manager" + mcreconcile "sigs.k8s.io/multicluster-runtime/pkg/reconcile" + "sigs.k8s.io/multicluster-runtime/providers/file" +) + +var ( + fKubeconfigFiles = flag.String("kubeconfigs", "", "Comma-separated list of kubeconfig file paths to process") + fKubeconfigDirs = flag.String("kubeconfig-dirs", "", "Comma-separated list of directories to search for kubeconfig files") + fGlobs = flag.String("globs", "", "Comma-separated list of glob patterns to match files") +) + +func main() { + ctrllog.SetLogger(zap.New(zap.UseDevMode(true))) + entryLog := ctrllog.Log.WithName("entrypoint") + ctx := signals.SetupSignalHandler() + + flag.Parse() + + kubeconfigFiles := strings.Split(*fKubeconfigFiles, ",") + if len(kubeconfigFiles) == 1 && kubeconfigFiles[0] == "" { + kubeconfigFiles = []string{} + } + + kubeconfigDirs := strings.Split(*fKubeconfigDirs, ",") + if len(kubeconfigDirs) == 1 && kubeconfigDirs[0] == "" { + kubeconfigDirs = []string{} + } + + provider, err := file.New(file.Options{ + KubeconfigFiles: kubeconfigFiles, + KubeconfigDirs: kubeconfigDirs, + KubeconfigGlobs: strings.Split(*fGlobs, ","), + }) + if err != nil { + entryLog.Info("Error creating provider: %v\n", err) + return + } + + mgr, err := mcmanager.New(ctrl.GetConfigOrDie(), provider, mcmanager.Options{}) + if err != nil { + entryLog.Info("unable to set up local controller manager: %w", err) + return + } + + if err := mcbuilder.ControllerManagedBy(mgr). + Named("multicluster-configmaps"). + For(&corev1.ConfigMap{}). + Complete(mcreconcile.Func( + func(ctx context.Context, req mcreconcile.Request) (ctrl.Result, error) { + log := ctrllog.FromContext(ctx).WithValues("cluster", req.ClusterName) + log.Info("Reconciling ConfigMap") + + cl, err := mgr.GetCluster(ctx, req.ClusterName) + if err != nil { + return reconcile.Result{}, err + } + + cm := &corev1.ConfigMap{} + if err := cl.GetClient().Get(ctx, req.Request.NamespacedName, cm); err != nil { + if apierrors.IsNotFound(err) { + return reconcile.Result{}, nil + } + return reconcile.Result{}, err + } + + log.Info("ConfigMap found", "namespace", cm.Namespace, "name", cm.Name, "cluster", req.ClusterName) + + return ctrl.Result{}, nil + }, + ), + ); err != nil { + entryLog.Info("failed to build controller: %w", err) + return + } + + g, ctx := errgroup.WithContext(ctx) + g.Go(func() error { + return ignoreCanceled(mgr.Start(ctx)) + }) + g.Go(func() error { + return ignoreCanceled(provider.Run(ctx, mgr)) + }) + if err := g.Wait(); err != nil { + entryLog.Info("error in errgroup: %w", err) + return + } +} + +func ignoreCanceled(err error) error { + if errors.Is(err, context.Canceled) { + return nil + } + return err +} diff --git a/providers/file/clusters.go b/providers/file/clusters.go new file mode 100644 index 0000000..0777182 --- /dev/null +++ b/providers/file/clusters.go @@ -0,0 +1,137 @@ +/* +Copyright 2025 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package file + +import ( + "fmt" + "os" + "path/filepath" + + "k8s.io/client-go/rest" + "k8s.io/client-go/tools/clientcmd" + + "sigs.k8s.io/controller-runtime/pkg/cluster" +) + +type clusters map[string]cluster.Cluster + +func (p *Provider) loadClusters() (clusters, error) { + filepaths, err := p.collectPaths() + if err != nil { + return nil, err + } + + kubeCtxs := map[string]*rest.Config{} + for _, filepath := range filepaths { + fileKubeCtxs, err := readFile(filepath) + if err != nil { + p.log.Error(err, "failed to read kubeconfig file", "file", filepath) + continue + } + for name, kubeCtx := range fileKubeCtxs { + clusterName := filepath + p.opts.Separator + name + if _, exists := kubeCtxs[clusterName]; exists { + p.log.Error(nil, "duplicate context name found", "file", filepath, "context", name, "clusterName", clusterName) + continue + } + kubeCtxs[clusterName] = kubeCtx + } + } + + return p.fromContexts(kubeCtxs), nil +} + +func (p *Provider) collectPaths() ([]string, error) { + filepaths := []string{} + + for _, file := range p.opts.KubeconfigFiles { + if _, err := os.Stat(file); err != nil { + if os.IsNotExist(err) { + p.log.Info("kubeconfig file does not exist, skipping", "file", file) + continue + } + return nil, fmt.Errorf("failed to stat kubeconfig file %q: %w", file, err) + } + filepaths = append(filepaths, file) + } + + for _, dir := range p.opts.KubeconfigDirs { + if _, err := os.Stat(dir); err != nil { + if os.IsNotExist(err) { + p.log.Info("directory does not exist, skipping", "dir", dir) + continue + } + return nil, fmt.Errorf("failed to stat directory %q: %w", dir, err) + } + + filepaths = append(filepaths, p.matchKubeconfigGlobs(dir)...) + } + + return filepaths, nil +} + +func (p *Provider) matchKubeconfigGlobs(dirpath string) []string { + matches := []string{} + + for _, glob := range p.opts.KubeconfigGlobs { + globMatches, err := filepath.Glob(filepath.Join(dirpath, glob)) + if err != nil { + p.log.Error(err, "failed to glob files", "dirpath", dirpath, "glob", glob) + continue + } + matches = append(matches, globMatches...) + } + + return matches +} + +func readFile(filepath string) (map[string]*rest.Config, error) { + config, err := clientcmd.LoadFromFile(filepath) + if err != nil { + return nil, fmt.Errorf("failed to load kubeconfig from file %q: %w", filepath, err) + } + + ret := make(map[string]*rest.Config, len(config.Contexts)) + for name := range config.Contexts { + restConfig, err := clientcmd.NewNonInteractiveClientConfig(*config, name, &clientcmd.ConfigOverrides{}, nil).ClientConfig() + if err != nil { + return nil, fmt.Errorf("failed to create rest config for context %q: %w", name, err) + } + ret[name] = restConfig + } + + return ret, nil +} + +func (p *Provider) fromContexts(kubeCtxs map[string]*rest.Config) clusters { + c := make(map[string]cluster.Cluster, len(kubeCtxs)) + + for name, kubeCtx := range kubeCtxs { + cl, err := cluster.New(kubeCtx) + if err != nil { + p.log.Error(err, "failed to create cluster", "context", name) + continue + } + if _, ok := c[name]; ok { + p.log.Error(nil, "duplicate context name found", "context", name) + continue + } + c[name] = cl + } + + return c +} diff --git a/providers/file/file_suite_test.go b/providers/file/file_suite_test.go new file mode 100644 index 0000000..8fc6687 --- /dev/null +++ b/providers/file/file_suite_test.go @@ -0,0 +1,47 @@ +/* +Copyright 2025 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package file + +import ( + "testing" + + logf "sigs.k8s.io/controller-runtime/pkg/log" + "sigs.k8s.io/controller-runtime/pkg/log/zap" + metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server" + + . "github.com/onsi/ginkgo/v2" + . "github.com/onsi/gomega" +) + +func TestBuilder(t *testing.T) { + RegisterFailHandler(Fail) + RunSpecs(t, "File Provider Suite") +} + +var _ = BeforeSuite(func() { + logf.SetLogger(zap.New(zap.WriteTo(GinkgoWriter), zap.UseDevMode(true))) + + // The file provider is designed to work with local files and + // directories, so we don't need envtest. + + // Prevent the metrics listener being created + metricsserver.DefaultBindAddress = "0" +}) + +var _ = AfterSuite(func() { + metricsserver.DefaultBindAddress = ":8080" +}) diff --git a/providers/file/go.mod b/providers/file/go.mod new file mode 100644 index 0000000..b682d62 --- /dev/null +++ b/providers/file/go.mod @@ -0,0 +1,73 @@ +module sigs.k8s.io/multicluster-runtime/providers/file + +go 1.24.0 + +replace sigs.k8s.io/multicluster-runtime => ../.. + +require ( + github.com/go-logr/logr v1.4.3 + github.com/google/go-cmp v0.7.0 + github.com/onsi/ginkgo/v2 v2.23.4 + github.com/onsi/gomega v1.38.0 + golang.org/x/sync v0.16.0 + gopkg.in/fsnotify.v1 v1.4.7 + k8s.io/client-go v0.33.3 + sigs.k8s.io/controller-runtime v0.21.0 + sigs.k8s.io/multicluster-runtime v0.0.0-00010101000000-000000000000 + sigs.k8s.io/randfill v1.0.0 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.11.0 // indirect + github.com/evanphx/json-patch/v5 v5.9.11 // indirect + github.com/fsnotify/fsnotify v1.7.0 // indirect + github.com/fxamacker/cbor/v2 v2.7.0 // indirect + github.com/go-logr/zapr v1.3.0 // indirect + github.com/go-openapi/jsonpointer v0.21.0 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.23.0 // indirect + github.com/go-task/slim-sprig/v3 v3.0.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/google/gnostic-models v0.6.9 // indirect + github.com/google/pprof v0.0.0-20250403155104-27863c87afa6 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // 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/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.22.0 // indirect + github.com/prometheus/client_model v0.6.1 // indirect + github.com/prometheus/common v0.62.0 // indirect + github.com/prometheus/procfs v0.15.1 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/x448/float16 v0.8.4 // indirect + go.uber.org/automaxprocs v1.6.0 // indirect + go.uber.org/multierr v1.11.0 // indirect + go.uber.org/zap v1.27.0 // indirect + golang.org/x/net v0.41.0 // indirect + golang.org/x/oauth2 v0.27.0 // indirect + golang.org/x/sys v0.33.0 // indirect + golang.org/x/term v0.32.0 // indirect + golang.org/x/text v0.26.0 // indirect + golang.org/x/time v0.9.0 // indirect + golang.org/x/tools v0.33.0 // indirect + gomodules.xyz/jsonpatch/v2 v2.4.0 // indirect + google.golang.org/protobuf v1.36.6 // indirect + gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/api v0.33.3 // indirect + k8s.io/apimachinery v0.33.3 // indirect + k8s.io/klog/v2 v2.130.1 // indirect + k8s.io/kube-openapi v0.0.0-20250318190949-c8a335a9a2ff // indirect + k8s.io/utils v0.0.0-20241104100929-3ea5e8cea738 // indirect + sigs.k8s.io/json v0.0.0-20241010143419-9aa6b5e7a4b3 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.6.0 // indirect + sigs.k8s.io/yaml v1.4.0 // indirect +) diff --git a/providers/file/go.sum b/providers/file/go.sum new file mode 100644 index 0000000..d455f72 --- /dev/null +++ b/providers/file/go.sum @@ -0,0 +1,203 @@ +github.com/beorn7/perks v1.0.1 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v0.0.0-20250304075658-069ef1bbf016/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY= +sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU= +sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0 h1:IUA9nvMmnKWcj5jl84xn+T5MnlZKThmUW1TdblaLVAc= +sigs.k8s.io/structured-merge-diff/v4 v4.6.0/go.mod h1:dDy58f92j70zLsuZVuUX5Wp9vtxXpaZnkPGWeqDfCps= +sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E= +sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY= diff --git a/providers/file/provider.go b/providers/file/provider.go new file mode 100644 index 0000000..a36a96b --- /dev/null +++ b/providers/file/provider.go @@ -0,0 +1,308 @@ +/* +Copyright 2025 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package file + +import ( + "context" + "fmt" + "maps" + "os" + "path/filepath" + "slices" + "sync" + + "github.com/go-logr/logr" + "github.com/google/go-cmp/cmp" + "gopkg.in/fsnotify.v1" + + "sigs.k8s.io/controller-runtime/pkg/client" + "sigs.k8s.io/controller-runtime/pkg/cluster" + "sigs.k8s.io/controller-runtime/pkg/log" + + mcmanager "sigs.k8s.io/multicluster-runtime/pkg/manager" + "sigs.k8s.io/multicluster-runtime/pkg/multicluster" +) + +var _ multicluster.Provider = &Provider{} + +// Options defines the options for the file-based cluster provider. +type Options struct { + // KubeconfigFiles are paths to kubeconfig files. + // The default depends on the KubeconfigDirs variable. + KubeconfigFiles []string + + // KubeconfigDirs are directories to search for kubeconfig files matching the + // globs specified in KubeconfigGlobs. + // + // If either one or both of KubeconfigFiles or KubeconfigDirs are + // set both are used as input for the provider. + // If both are empty defaults are applied in order of precedence: + // 1. If the KUBECONFIG environment variable is set and contains + // a path to a valid file it is used in KubeconfigFiles. + // 2. If ~/.kube/config exists it is used in KubeconfigFiles. + // 3. The working directory is used in KubeconfigDirs. + KubeconfigDirs []string + + // KubeconfigGlobs are the glob patterns to match kubeconfig files + // in directories. + // Default is DefaultKubeconfigGlobs. + KubeconfigGlobs []string + + // Separator is the string used as a separator between the file path + // and context name when creating cluster names. + // Default is "+". + // E.g. a kubeconfig file at /a/b/c/kubeconfig.yaml with a context + // "my-context" would result in a cluster name + // "/a/b/c/kubeconfig.yaml+my-context". + Separator string +} + +// DefaultKubeconfigGlobs are the default glob patterns when searching +// for kubeconfig files in a directory. +var DefaultKubeconfigGlobs = []string{ + "kubeconfig.yaml", + "kubeconfig.yml", + "*.kubeconfig", + "*.kubeconfig.yaml", + "*.kubeconfig.yml", +} + +func (p *Provider) defaultKubeconfigPaths() ([]string, []string) { + if envKubeconfig := os.Getenv("KUBECONFIG"); envKubeconfig != "" { + return []string{envKubeconfig}, []string{} + } + + defaultKubeconfig := os.ExpandEnv("$HOME/.kube/config") + if _, err := os.Stat(defaultKubeconfig); err == nil { + return []string{defaultKubeconfig}, []string{} + } + + pwd, err := os.Getwd() + if err != nil { + p.log.Error(err, "error getting working directory, defaulting to '.'") + pwd = "." + } + + return []string{}, []string{pwd} +} + +// New returns a new Provider with the given options. +func New(opts Options) (*Provider, error) { + p := new(Provider) + p.opts = opts + + if len(p.opts.KubeconfigFiles) == 0 && len(p.opts.KubeconfigDirs) == 0 { + p.opts.KubeconfigFiles, p.opts.KubeconfigDirs = p.defaultKubeconfigPaths() + } + + if len(p.opts.KubeconfigGlobs) == 0 { + p.opts.KubeconfigGlobs = DefaultKubeconfigGlobs + } + + if p.opts.Separator == "" { + p.opts.Separator = "+" + } + + p.log = log.Log.WithName("file-cluster-provider") + p.clusters = make(map[string]cluster.Cluster) + p.clusterCancel = make(map[string]func()) + + p.log.Info("file cluster provider initialized", + "kubeconfigFiles", p.opts.KubeconfigFiles, + "kubeconfigDirs", p.opts.KubeconfigDirs, + "kubeconfigGlobs", p.opts.KubeconfigGlobs, + ) + + return p, nil +} + +// Provider is a multicluster.Provider that loads clusters from +// kubeconfig files or directories on disk. +type Provider struct { + opts Options + + log logr.Logger + + clustersLock sync.RWMutex + clusters map[string]cluster.Cluster + clusterCancel map[string]func() +} + +// Run starts the provider and updates the clusters and is blocking. +func (p *Provider) Run(ctx context.Context, mgr mcmanager.Manager) error { + if err := p.run(ctx, mgr); err != nil { + return fmt.Errorf("initial update failed: %w", err) + } + + watcher, err := fsnotify.NewWatcher() + if err != nil { + return fmt.Errorf("failed to create file watcher: %w", err) + } + defer watcher.Close() + + for _, file := range p.opts.KubeconfigFiles { + // Watching the directory instead of kubeconfig files as + // watching non-existing files is not supported in fsnotify. + if err := watcher.Add(filepath.Dir(file)); err != nil { + return fmt.Errorf("failed to watch parent dir of kubeconfig file %q: %w", file, err) + } + } + + for _, dir := range p.opts.KubeconfigDirs { + if err := watcher.Add(dir); err != nil { + return fmt.Errorf("failed to watch kubeconfig directory %q: %w", dir, err) + } + } + + for { + select { + case <-ctx.Done(): + return ctx.Err() + case event, ok := <-watcher.Events: + if !ok { + return fmt.Errorf("file watcher closed") + } + p.log.Info("received fsnotify event", "event", event) + // Only updating from a single file would be possible but + // would also require to track which cluster belongs to + // which file. + // Instead clusters are just updated from all files. + if err := p.run(ctx, mgr); err != nil { + p.log.Error(err, "failed to update clusters after file change") + } + case err, ok := <-watcher.Errors: + if !ok { + return fmt.Errorf("file watcher errors channel closed") + } + p.log.Error(err, "file watcher error") + } + } +} + +// RunOnce performs a single update of the clusters. +func (p *Provider) RunOnce(ctx context.Context, mgr mcmanager.Manager) error { + return p.run(ctx, mgr) +} + +func (p *Provider) addCluster(ctx context.Context, mgr mcmanager.Manager, name string, cl cluster.Cluster) { + ctx, cancel := context.WithCancel(ctx) + + p.clustersLock.Lock() + p.clusters[name] = cl + p.clusterCancel[name] = cancel + p.clustersLock.Unlock() + + go func() { + if err := cl.Start(ctx); err != nil { + p.log.Error(err, "error in cluster", "name", name) + } + p.removeCluster(name) + }() + + if mgr != nil { + if err := mgr.Engage(ctx, name, cl); err != nil { + cancel() + p.log.Error(err, "failed to engage cluster", "name", name) + } + } +} + +func (p *Provider) removeCluster(name string) { + p.clustersLock.Lock() + defer p.clustersLock.Unlock() + + if cancel, ok := p.clusterCancel[name]; ok { + cancel() + delete(p.clusters, name) + delete(p.clusterCancel, name) + } +} + +func (p *Provider) run(ctx context.Context, mgr mcmanager.Manager) error { + loadedClusters, err := p.loadClusters() + if err != nil { + return fmt.Errorf("failed to load clusters: %w", err) + } + knownClusters := p.ClusterNames() + + // add new clusters + for name, cl := range loadedClusters { + if slices.Contains(knownClusters, name) { + // update if the config has changed + existingCluster, _ := p.Get(ctx, name) + if !cmp.Equal(existingCluster.GetConfig(), cl.GetConfig()) { + p.log.Info("updating cluster", "name", name) + p.removeCluster(name) + p.addCluster(ctx, mgr, name, cl) + } + continue + } + p.log.Info("adding cluster", "name", name) + p.addCluster(ctx, mgr, name, cl) + } + + // delete clusters that are no longer present + for _, name := range knownClusters { + if _, ok := loadedClusters[name]; ok { + continue + } + p.log.Info("removing cluster", "name", name) + p.removeCluster(name) + } + + return nil +} + +// Get returns the cluster with the given name. +// If the cluster name is empty (""), it returns the first cluster +// found. +func (p *Provider) Get(_ context.Context, clusterName string) (cluster.Cluster, error) { + p.clustersLock.RLock() + defer p.clustersLock.RUnlock() + + if clusterName == "" { + for _, cl := range p.clusters { + return cl, nil + } + } + + cl, ok := p.clusters[clusterName] + if !ok { + return nil, multicluster.ErrClusterNotFound + } + return cl, nil +} + +// IndexField indexes a field on all clusters. +func (p *Provider) IndexField(ctx context.Context, obj client.Object, field string, extractValue client.IndexerFunc) error { + p.clustersLock.RLock() + defer p.clustersLock.RUnlock() + + for name, cl := range p.clusters { + if err := cl.GetCache().IndexField(ctx, obj, field, extractValue); err != nil { + return fmt.Errorf("failed to index field %q on cluster %q: %w", field, name, err) + } + } + return nil +} + +// ClusterNames returns the names of all clusters known to the provider. +func (p *Provider) ClusterNames() []string { + p.clustersLock.RLock() + defer p.clustersLock.RUnlock() + return slices.Sorted(maps.Keys(p.clusters)) +} diff --git a/providers/file/provider_test.go b/providers/file/provider_test.go new file mode 100644 index 0000000..56d9537 --- /dev/null +++ b/providers/file/provider_test.go @@ -0,0 +1,214 @@ +/* +Copyright 2025 The Kubernetes Authors. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package file + +import ( + "context" + "encoding/base64" + "errors" + "os" + "path/filepath" + + "golang.org/x/sync/errgroup" + "sigs.k8s.io/randfill" + + "k8s.io/client-go/tools/clientcmd" + clientcmdapi "k8s.io/client-go/tools/clientcmd/api" + + . "github.com/onsi/ginkgo/v2" + . "github.com/onsi/gomega" +) + +var _ = Describe("Provider File", Ordered, func() { + ctx, cancel := context.WithCancel(context.Background()) + g, ctx := errgroup.WithContext(ctx) + + var discoverDir string + var kubeconfigDir string + var kubeconfigPath string + var provider *Provider + + BeforeAll(func() { + discoverDir = GinkgoT().TempDir() + kubeconfigDir = GinkgoT().TempDir() + kubeconfigPath = filepath.Join(kubeconfigDir, "non-descript-name") + + By("Creating a new provider", func() { + var err error + provider, err = New(Options{ + KubeconfigFiles: []string{kubeconfigPath}, + KubeconfigDirs: []string{discoverDir}, + }) + Expect(err).NotTo(HaveOccurred()) + }) + + By("Starting the provider", func() { + g.Go(func() error { + return ignoreCanceled(provider.Run(ctx, nil)) + }) + }) + + By("Creating a temporary directory for discovery", func() { + err := os.MkdirAll(discoverDir, 0755) + Expect(err).NotTo(HaveOccurred(), "Failed to create discovery directory") + }) + + By("Creating a temporary directory for kubeconfig files", func() { + err := os.MkdirAll(kubeconfigDir, 0755) + Expect(err).NotTo(HaveOccurred(), "Failed to create kubeconfig file") + }) + + }) + + It("should not have any clusters initially", func(ctx context.Context) { + knownClusters := provider.ClusterNames() + Expect(knownClusters).To(BeEmpty(), "Expected no clusters to be known initially") + }) + + var directoryContexts []string + It("should discover clusters from files inside the directories", func(ctx context.Context) { + By("Creating a kubeconfig file in the test directory", func() { + var err error + directoryContexts, err = randomKubeconfig(1, filepath.Join(discoverDir, "kubeconfig.yaml")) + Expect(err).NotTo(HaveOccurred(), "Failed to write kubeconfig file") + Expect(directoryContexts).To(HaveLen(1), "Expected one kubeconfig file to be generated") + }) + + Eventually(provider.ClusterNames, "10s", "1s").Should(Equal(directoryContexts), "Expected provider to discover kubeconfig contexts from directory") + }) + + var kubeconfigContexts []string + It("should discovery multiple clusters from passed filename", func(ctx context.Context) { + By("Creating multiple kubeconfig files in the test directory", func() { + var err error + kubeconfigContexts, err = randomKubeconfig(2, kubeconfigPath) + Expect(err).NotTo(HaveOccurred(), "Failed to write kubeconfig files") + Expect(kubeconfigContexts).To(HaveLen(2), "Expected two kubeconfig files to be generated") + }) + + Eventually(provider.ClusterNames, "10s", "1s").Should(ContainElements(kubeconfigContexts), "Expected provider to discover kubeconfig contexts") + }) + + It("should discover clusters from both directories", func(ctx context.Context) { + Eventually(provider.ClusterNames, "10s", "1s").Should(ContainElements(directoryContexts), "Expected provider to discover clusters from directory") + Eventually(provider.ClusterNames, "10s", "1s").Should(ContainElements(kubeconfigContexts), "Expected provider to discover clusters from kubeconfig files") + }) + + It("should remove clusters when the respective kubeconfig is deleted", func(ctx context.Context) { + By("Deleting the kubeconfig file in the test directory", func() { + err := os.Remove(kubeconfigPath) + Expect(err).NotTo(HaveOccurred(), "Failed to remove kubeconfig file") + }) + + Eventually(provider.ClusterNames, "10s", "1s").ShouldNot(Equal(kubeconfigContexts), "Expected provider to remove kubeconfig contexts after file deletion") + }) + + var newDirectoryContexts []string + It("should remove old clusters and add new ones when kubeconfig files are updated", func(ctx context.Context) { + By("Updating the kubeconfig file in the test directory", func() { + var err error + newDirectoryContexts, err = randomKubeconfig(2, filepath.Join(discoverDir, "kubeconfig.yaml")) + Expect(err).NotTo(HaveOccurred(), "Failed to write updated kubeconfig file") + Expect(newDirectoryContexts).To(HaveLen(2), "Expected two new kubeconfig contexts to be generated") + }) + + Eventually(provider.ClusterNames, "10s", "1s").Should(ContainElements(newDirectoryContexts), "Expected provider to discover new kubeconfig contexts") + Eventually(provider.ClusterNames, "10s", "1s").ShouldNot(ContainElements(directoryContexts), "Expected provider to remove old kubeconfig contexts") + }) + + AfterAll(func() { + By("Stopping the provider", func() { + cancel() + err := g.Wait() + Expect(err).To(Succeed(), "Expected provider to stop without error") + }) + }) +}) + +func ignoreCanceled(err error) error { + if errors.Is(err, context.Canceled) { + return nil + } + return err +} + +// randomKubeconfig generates a kubeconfig file with n contexts and +// writes it to the specified path. +// The names of the contexts are returned. +func randomKubeconfig(n int, path string) ([]string, error) { + cfg := clientcmdapi.NewConfig() + contextNames := make([]string, n) + + filler := randfill.New() + for i := 0; i < n; i++ { + var contextName string + ok := false + for !ok { + contextName, ok = randomKubeconfigContent(filler, cfg) + } + contextNames[i] = contextName + } + + if err := clientcmd.WriteToFile(*cfg, path); err != nil { + return nil, err + } + + return contextNames, nil +} + +func randomString(filler *randfill.Filler, length int) string { + b := make([]byte, length) + filler.Fill(&b) + // Otherwise we might end up with a string that contains invalid + // characters for a kubeconfig + return base64.URLEncoding.EncodeToString(b) +} + +// randomKubeconfigContent generates a random kubeconfig context, auth +// info, and cluster, returning the context name a bool indicating +// success. +func randomKubeconfigContent(filler *randfill.Filler, cfg *clientcmdapi.Config) (string, bool) { + contextName := randomString(filler, 20) + if cfg.Contexts[contextName] != nil { + return "", false + } + + authInfoName := randomString(filler, 20) + if cfg.AuthInfos[authInfoName] != nil { + return "", false + } + authInfo := clientcmdapi.NewAuthInfo() + authInfo.Token = randomString(filler, 64) // Ensure the token is a valid length + + clusterName := randomString(filler, 20) + if cfg.Clusters[clusterName] != nil { + return "", false + } + cluster := clientcmdapi.NewCluster() + cluster.Server = randomString(filler, 120) + ":6443" // Append a port to make it look like a valid server address + filler.Fill(&cluster.CertificateAuthorityData) + + context := clientcmdapi.NewContext() + context.AuthInfo = authInfoName + context.Cluster = clusterName + + cfg.AuthInfos[authInfoName] = authInfo + cfg.Clusters[clusterName] = cluster + cfg.Contexts[contextName] = context + + return contextName, true +}