mirror of
https://github.com/k3s-io/k3s.git
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313 lines
10 KiB
Go
313 lines
10 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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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 metadata
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import (
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"encoding/json"
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"fmt"
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"time"
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"k8s.io/klog"
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metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/rest"
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)
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var deleteScheme = runtime.NewScheme()
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var parameterScheme = runtime.NewScheme()
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var deleteOptionsCodec = serializer.NewCodecFactory(deleteScheme)
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var dynamicParameterCodec = runtime.NewParameterCodec(parameterScheme)
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var versionV1 = schema.GroupVersion{Version: "v1"}
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func init() {
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metav1.AddToGroupVersion(parameterScheme, versionV1)
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metav1.AddToGroupVersion(deleteScheme, versionV1)
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}
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// Client allows callers to retrieve the object metadata for any
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// Kubernetes-compatible API endpoint. The client uses the
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// meta.k8s.io/v1 PartialObjectMetadata resource to more efficiently
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// retrieve just the necessary metadata, but on older servers
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// (Kubernetes 1.14 and before) will retrieve the object and then
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// convert the metadata.
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type Client struct {
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client *rest.RESTClient
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}
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var _ Interface = &Client{}
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// ConfigFor returns a copy of the provided config with the
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// appropriate metadata client defaults set.
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func ConfigFor(inConfig *rest.Config) *rest.Config {
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config := rest.CopyConfig(inConfig)
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config.AcceptContentTypes = "application/vnd.kubernetes.protobuf,application/json"
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config.ContentType = "application/vnd.kubernetes.protobuf"
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config.NegotiatedSerializer = metainternalversionscheme.Codecs.WithoutConversion()
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if config.UserAgent == "" {
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config.UserAgent = rest.DefaultKubernetesUserAgent()
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}
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return config
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}
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// NewForConfigOrDie creates a new metadata client for the given config and
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// panics if there is an error in the config.
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func NewForConfigOrDie(c *rest.Config) Interface {
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ret, err := NewForConfig(c)
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if err != nil {
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panic(err)
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}
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return ret
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}
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// NewForConfig creates a new metadata client that can retrieve object
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// metadata details about any Kubernetes object (core, aggregated, or custom
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// resource based) in the form of PartialObjectMetadata objects, or returns
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// an error.
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func NewForConfig(inConfig *rest.Config) (Interface, error) {
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config := ConfigFor(inConfig)
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// for serializing the options
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config.GroupVersion = &schema.GroupVersion{}
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config.APIPath = "/this-value-should-never-be-sent"
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restClient, err := rest.RESTClientFor(config)
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if err != nil {
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return nil, err
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}
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return &Client{client: restClient}, nil
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}
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type client struct {
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client *Client
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namespace string
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resource schema.GroupVersionResource
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}
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// Resource returns an interface that can access cluster or namespace
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// scoped instances of resource.
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func (c *Client) Resource(resource schema.GroupVersionResource) Getter {
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return &client{client: c, resource: resource}
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}
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// Namespace returns an interface that can access namespace-scoped instances of the
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// provided resource.
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func (c *client) Namespace(ns string) ResourceInterface {
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ret := *c
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ret.namespace = ns
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return &ret
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}
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// Delete removes the provided resource from the server.
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func (c *client) Delete(name string, opts *metav1.DeleteOptions, subresources ...string) error {
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if len(name) == 0 {
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return fmt.Errorf("name is required")
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}
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if opts == nil {
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opts = &metav1.DeleteOptions{}
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}
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deleteOptionsByte, err := runtime.Encode(deleteOptionsCodec.LegacyCodec(schema.GroupVersion{Version: "v1"}), opts)
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if err != nil {
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return err
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}
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result := c.client.client.
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Delete().
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AbsPath(append(c.makeURLSegments(name), subresources...)...).
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Body(deleteOptionsByte).
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Do()
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return result.Error()
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}
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// DeleteCollection triggers deletion of all resources in the specified scope (namespace or cluster).
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func (c *client) DeleteCollection(opts *metav1.DeleteOptions, listOptions metav1.ListOptions) error {
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if opts == nil {
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opts = &metav1.DeleteOptions{}
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}
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deleteOptionsByte, err := runtime.Encode(deleteOptionsCodec.LegacyCodec(schema.GroupVersion{Version: "v1"}), opts)
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if err != nil {
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return err
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}
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result := c.client.client.
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Delete().
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AbsPath(c.makeURLSegments("")...).
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Body(deleteOptionsByte).
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SpecificallyVersionedParams(&listOptions, dynamicParameterCodec, versionV1).
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Do()
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return result.Error()
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}
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// Get returns the resource with name from the specified scope (namespace or cluster).
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func (c *client) Get(name string, opts metav1.GetOptions, subresources ...string) (*metav1.PartialObjectMetadata, error) {
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if len(name) == 0 {
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return nil, fmt.Errorf("name is required")
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}
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result := c.client.client.Get().AbsPath(append(c.makeURLSegments(name), subresources...)...).
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SetHeader("Accept", "application/vnd.kubernetes.protobuf;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json").
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SpecificallyVersionedParams(&opts, dynamicParameterCodec, versionV1).
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Do()
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if err := result.Error(); err != nil {
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return nil, err
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}
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obj, err := result.Get()
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if runtime.IsNotRegisteredError(err) {
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klog.V(5).Infof("Unable to retrieve PartialObjectMetadata: %#v", err)
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rawBytes, err := result.Raw()
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if err != nil {
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return nil, err
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}
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var partial metav1.PartialObjectMetadata
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if err := json.Unmarshal(rawBytes, &partial); err != nil {
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return nil, fmt.Errorf("unable to decode returned object as PartialObjectMetadata: %v", err)
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}
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if !isLikelyObjectMetadata(&partial) {
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return nil, fmt.Errorf("object does not appear to match the ObjectMeta schema: %#v", partial)
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}
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partial.TypeMeta = metav1.TypeMeta{}
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return &partial, nil
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}
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if err != nil {
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return nil, err
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}
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partial, ok := obj.(*metav1.PartialObjectMetadata)
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if !ok {
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return nil, fmt.Errorf("unexpected object, expected PartialObjectMetadata but got %T", obj)
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}
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return partial, nil
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}
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// List returns all resources within the specified scope (namespace or cluster).
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func (c *client) List(opts metav1.ListOptions) (*metav1.PartialObjectMetadataList, error) {
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result := c.client.client.Get().AbsPath(c.makeURLSegments("")...).
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SetHeader("Accept", "application/vnd.kubernetes.protobuf;as=PartialObjectMetadataList;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadataList;g=meta.k8s.io;v=v1,application/json").
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SpecificallyVersionedParams(&opts, dynamicParameterCodec, versionV1).
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Do()
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if err := result.Error(); err != nil {
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return nil, err
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}
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obj, err := result.Get()
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if runtime.IsNotRegisteredError(err) {
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klog.V(5).Infof("Unable to retrieve PartialObjectMetadataList: %#v", err)
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rawBytes, err := result.Raw()
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if err != nil {
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return nil, err
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}
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var partial metav1.PartialObjectMetadataList
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if err := json.Unmarshal(rawBytes, &partial); err != nil {
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return nil, fmt.Errorf("unable to decode returned object as PartialObjectMetadataList: %v", err)
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}
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partial.TypeMeta = metav1.TypeMeta{}
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return &partial, nil
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}
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if err != nil {
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return nil, err
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}
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partial, ok := obj.(*metav1.PartialObjectMetadataList)
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if !ok {
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return nil, fmt.Errorf("unexpected object, expected PartialObjectMetadata but got %T", obj)
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}
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return partial, nil
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}
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// Watch finds all changes to the resources in the specified scope (namespace or cluster).
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func (c *client) Watch(opts metav1.ListOptions) (watch.Interface, error) {
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var timeout time.Duration
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if opts.TimeoutSeconds != nil {
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timeout = time.Duration(*opts.TimeoutSeconds) * time.Second
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}
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opts.Watch = true
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return c.client.client.Get().
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AbsPath(c.makeURLSegments("")...).
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SetHeader("Accept", "application/vnd.kubernetes.protobuf;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json").
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SpecificallyVersionedParams(&opts, dynamicParameterCodec, versionV1).
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Timeout(timeout).
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Watch()
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}
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// Patch modifies the named resource in the specified scope (namespace or cluster).
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func (c *client) Patch(name string, pt types.PatchType, data []byte, opts metav1.PatchOptions, subresources ...string) (*metav1.PartialObjectMetadata, error) {
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if len(name) == 0 {
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return nil, fmt.Errorf("name is required")
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}
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result := c.client.client.
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Patch(pt).
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AbsPath(append(c.makeURLSegments(name), subresources...)...).
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Body(data).
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SetHeader("Accept", "application/vnd.kubernetes.protobuf;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json").
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SpecificallyVersionedParams(&opts, dynamicParameterCodec, versionV1).
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Do()
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if err := result.Error(); err != nil {
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return nil, err
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}
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obj, err := result.Get()
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if runtime.IsNotRegisteredError(err) {
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rawBytes, err := result.Raw()
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if err != nil {
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return nil, err
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}
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var partial metav1.PartialObjectMetadata
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if err := json.Unmarshal(rawBytes, &partial); err != nil {
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return nil, fmt.Errorf("unable to decode returned object as PartialObjectMetadata: %v", err)
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}
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if !isLikelyObjectMetadata(&partial) {
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return nil, fmt.Errorf("object does not appear to match the ObjectMeta schema")
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}
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partial.TypeMeta = metav1.TypeMeta{}
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return &partial, nil
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}
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if err != nil {
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return nil, err
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}
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partial, ok := obj.(*metav1.PartialObjectMetadata)
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if !ok {
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return nil, fmt.Errorf("unexpected object, expected PartialObjectMetadata but got %T", obj)
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}
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return partial, nil
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}
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func (c *client) makeURLSegments(name string) []string {
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url := []string{}
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if len(c.resource.Group) == 0 {
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url = append(url, "api")
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} else {
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url = append(url, "apis", c.resource.Group)
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}
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url = append(url, c.resource.Version)
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if len(c.namespace) > 0 {
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url = append(url, "namespaces", c.namespace)
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}
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url = append(url, c.resource.Resource)
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if len(name) > 0 {
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url = append(url, name)
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}
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return url
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}
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func isLikelyObjectMetadata(meta *metav1.PartialObjectMetadata) bool {
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return len(meta.UID) > 0 || !meta.CreationTimestamp.IsZero() || len(meta.Name) > 0 || len(meta.GenerateName) > 0
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}
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