147 lines
4.1 KiB
Go
147 lines
4.1 KiB
Go
package cluster
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import (
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"bytes"
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"context"
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"io"
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"io/ioutil"
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"net/http"
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corev1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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listcorev1 "k8s.io/client-go/listers/core/v1"
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clusterapis "github.com/karmada-io/karmada/pkg/apis/cluster"
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clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
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clusterlisters "github.com/karmada-io/karmada/pkg/generated/listers/cluster/v1alpha1"
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"github.com/karmada-io/karmada/pkg/search/proxy/framework"
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pluginruntime "github.com/karmada-io/karmada/pkg/search/proxy/framework/runtime"
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"github.com/karmada-io/karmada/pkg/search/proxy/store"
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"github.com/karmada-io/karmada/pkg/util/proxy"
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)
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const (
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// We keep a big gap between in-tree plugins, to allow users to insert custom plugins between them.
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order = 2000
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)
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// Cluster proxies the remaining requests to member clusters:
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// - writing resources.
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// - or subresource requests, e.g. `pods/log`
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// We firstly find the resource from cache, and get the located cluster. Then redirect the request to the cluster.
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type Cluster struct {
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store store.Store
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clusterLister clusterlisters.ClusterLister
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secretLister listcorev1.SecretLister
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}
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var _ framework.Plugin = (*Cluster)(nil)
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// New creates an instance of Cluster
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func New(dep pluginruntime.PluginDependency) (framework.Plugin, error) {
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secretLister := dep.KubeFactory.Core().V1().Secrets().Lister()
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clusterLister := dep.KarmadaFactory.Cluster().V1alpha1().Clusters().Lister()
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return &Cluster{
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store: dep.Store,
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clusterLister: clusterLister,
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secretLister: secretLister,
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}, nil
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}
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// Order implements Plugin
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func (c *Cluster) Order() int {
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return order
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}
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// SupportRequest implements Plugin
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func (c *Cluster) SupportRequest(request framework.ProxyRequest) bool {
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return request.RequestInfo.IsResourceRequest && c.store.HasResource(request.GroupVersionResource)
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}
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// Connect implements Plugin
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func (c *Cluster) Connect(ctx context.Context, request framework.ProxyRequest) (http.Handler, error) {
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requestInfo := request.RequestInfo
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if requestInfo.Verb == "create" {
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return nil, apierrors.NewMethodNotSupported(request.GroupVersionResource.GroupResource(), requestInfo.Verb)
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}
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_, clusterName, err := c.store.GetResourceFromCache(ctx, request.GroupVersionResource, requestInfo.Namespace, requestInfo.Name)
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if err != nil {
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return nil, err
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}
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cls, err := c.clusterLister.Get(clusterName)
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if err != nil {
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return nil, err
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}
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cluster := &clusterapis.Cluster{}
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err = clusterv1alpha1.Convert_v1alpha1_Cluster_To_cluster_Cluster(cls, cluster, nil)
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if err != nil {
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return nil, err
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}
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secretGetter := func(ctx context.Context, namespace, name string) (*corev1.Secret, error) {
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return c.secretLister.Secrets(namespace).Get(name)
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}
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h, err := proxy.ConnectCluster(ctx, cluster, request.ProxyPath, secretGetter, request.Responder)
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if err != nil {
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return nil, err
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}
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if requestInfo.Verb != "update" {
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return h, nil
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}
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// Objects get by client via proxy are edited some fields, different from objets in member clusters.
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// So before update, we shall recover these fields.
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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if err = modifyRequest(req, clusterName); err != nil {
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request.Responder.Error(err)
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return
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}
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h.ServeHTTP(rw, req)
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}), nil
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}
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func modifyRequest(req *http.Request, cluster string) error {
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if req.ContentLength == 0 {
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return nil
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}
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body := bytes.NewBuffer(make([]byte, 0, req.ContentLength))
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_, err := io.Copy(body, req.Body)
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if err != nil {
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return err
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}
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_ = req.Body.Close()
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defer func() {
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req.Body = ioutil.NopCloser(body)
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req.ContentLength = int64(body.Len())
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}()
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obj := &unstructured.Unstructured{}
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_, _, err = unstructured.UnstructuredJSONScheme.Decode(body.Bytes(), nil, obj)
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if err != nil {
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// ignore error
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return nil
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}
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changed := false
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changed = store.RemoveCacheSourceAnnotation(obj) || changed
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changed = store.RecoverClusterResourceVersion(obj, cluster) || changed
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if changed {
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// write changed object into body
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body.Reset()
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return unstructured.UnstructuredJSONScheme.Encode(obj, body)
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}
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return nil
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}
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