292 lines
9.1 KiB
Go
292 lines
9.1 KiB
Go
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/*
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Copyright 2014 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 resource
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import (
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"fmt"
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"reflect"
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"k8s.io/apimachinery/pkg/api/meta"
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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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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/apis/extensions"
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)
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// ErrMatchFunc can be used to filter errors that may not be true failures.
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type ErrMatchFunc func(error) bool
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// Result contains helper methods for dealing with the outcome of a Builder.
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type Result struct {
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err error
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visitor Visitor
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sources []Visitor
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singleItemImplied bool
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ignoreErrors []utilerrors.Matcher
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// populated by a call to Infos
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info []*Info
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}
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// IgnoreErrors will filter errors that occur when by visiting the result
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// (but not errors that occur by creating the result in the first place),
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// eliminating any that match fns. This is best used in combination with
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// Builder.ContinueOnError(), where the visitors accumulate errors and return
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// them after visiting as a slice of errors. If no errors remain after
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// filtering, the various visitor methods on Result will return nil for
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// err.
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func (r *Result) IgnoreErrors(fns ...ErrMatchFunc) *Result {
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for _, fn := range fns {
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r.ignoreErrors = append(r.ignoreErrors, utilerrors.Matcher(fn))
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}
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return r
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}
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// Err returns one or more errors (via a util.ErrorList) that occurred prior
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// to visiting the elements in the visitor. To see all errors including those
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// that occur during visitation, invoke Infos().
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func (r *Result) Err() error {
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return r.err
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}
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// Visit implements the Visitor interface on the items described in the Builder.
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// Note that some visitor sources are not traversable more than once, or may
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// return different results. If you wish to operate on the same set of resources
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// multiple times, use the Infos() method.
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func (r *Result) Visit(fn VisitorFunc) error {
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if r.err != nil {
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return r.err
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}
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err := r.visitor.Visit(fn)
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return utilerrors.FilterOut(err, r.ignoreErrors...)
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}
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// IntoSingleItemImplied sets the provided boolean pointer to true if the Builder input
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// implies a single item, or multiple.
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func (r *Result) IntoSingleItemImplied(b *bool) *Result {
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*b = r.singleItemImplied
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return r
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}
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// Infos returns an array of all of the resource infos retrieved via traversal.
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// Will attempt to traverse the entire set of visitors only once, and will return
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// a cached list on subsequent calls.
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func (r *Result) Infos() ([]*Info, error) {
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if r.err != nil {
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return nil, r.err
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}
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if r.info != nil {
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return r.info, nil
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}
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infos := []*Info{}
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err := r.visitor.Visit(func(info *Info, err error) error {
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if err != nil {
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return err
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}
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infos = append(infos, info)
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return nil
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})
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err = utilerrors.FilterOut(err, r.ignoreErrors...)
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r.info, r.err = infos, err
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return infos, err
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}
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// Object returns a single object representing the output of a single visit to all
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// found resources. If the Builder was a singular context (expected to return a
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// single resource by user input) and only a single resource was found, the resource
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// will be returned as is. Otherwise, the returned resources will be part of an
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// api.List. The ResourceVersion of the api.List will be set only if it is identical
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// across all infos returned.
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func (r *Result) Object() (runtime.Object, error) {
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infos, err := r.Infos()
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if err != nil {
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return nil, err
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}
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versions := sets.String{}
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objects := []runtime.Object{}
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for _, info := range infos {
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if info.Object != nil {
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objects = append(objects, info.Object)
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versions.Insert(info.ResourceVersion)
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}
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}
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if len(objects) == 1 {
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if r.singleItemImplied {
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return objects[0], nil
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}
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// if the item is a list already, don't create another list
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if meta.IsListType(objects[0]) {
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return objects[0], nil
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}
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}
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version := ""
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if len(versions) == 1 {
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version = versions.List()[0]
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}
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return &api.List{
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ListMeta: metav1.ListMeta{
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ResourceVersion: version,
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},
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Items: objects,
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}, err
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}
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// ResourceMapping returns a single meta.RESTMapping representing the
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// resources located by the builder, or an error if more than one
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// mapping was found.
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func (r *Result) ResourceMapping() (*meta.RESTMapping, error) {
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if r.err != nil {
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return nil, r.err
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}
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mappings := map[string]*meta.RESTMapping{}
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for i := range r.sources {
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m, ok := r.sources[i].(ResourceMapping)
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if !ok {
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return nil, fmt.Errorf("a resource mapping could not be loaded from %v", reflect.TypeOf(r.sources[i]))
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}
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mapping := m.ResourceMapping()
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mappings[mapping.Resource] = mapping
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}
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if len(mappings) != 1 {
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return nil, fmt.Errorf("expected only a single resource type")
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}
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for _, mapping := range mappings {
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return mapping, nil
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}
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return nil, nil
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}
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// Watch retrieves changes that occur on the server to the specified resource.
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// It currently supports watching a single source - if the resource source
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// (selectors or pure types) can be watched, they will be, otherwise the list
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// will be visited (equivalent to the Infos() call) and if there is a single
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// resource present, it will be watched, otherwise an error will be returned.
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func (r *Result) Watch(resourceVersion string) (watch.Interface, error) {
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if r.err != nil {
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return nil, r.err
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}
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if len(r.sources) != 1 {
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return nil, fmt.Errorf("you may only watch a single resource or type of resource at a time")
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}
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w, ok := r.sources[0].(Watchable)
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if !ok {
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info, err := r.Infos()
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if err != nil {
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return nil, err
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}
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if len(info) != 1 {
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return nil, fmt.Errorf("watch is only supported on individual resources and resource collections - %d resources were found", len(info))
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}
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return info[0].Watch(resourceVersion)
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}
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return w.Watch(resourceVersion)
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}
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// AsVersionedObject converts a list of infos into a single object - either a List containing
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// the objects as children, or if only a single Object is present, as that object. The provided
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// version will be preferred as the conversion target, but the Object's mapping version will be
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// used if that version is not present.
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func AsVersionedObject(infos []*Info, forceList bool, version schema.GroupVersion, encoder runtime.Encoder) (runtime.Object, error) {
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objects, err := AsVersionedObjects(infos, version, encoder)
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if err != nil {
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return nil, err
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}
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var object runtime.Object
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if len(objects) == 1 && !forceList {
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object = objects[0]
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} else {
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object = &api.List{Items: objects}
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converted, err := TryConvert(api.Scheme, object, version, api.Registry.GroupOrDie(api.GroupName).GroupVersion)
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if err != nil {
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return nil, err
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}
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object = converted
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}
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return object, nil
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}
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// AsVersionedObjects converts a list of infos into versioned objects. The provided
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// version will be preferred as the conversion target, but the Object's mapping version will be
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// used if that version is not present.
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func AsVersionedObjects(infos []*Info, version schema.GroupVersion, encoder runtime.Encoder) ([]runtime.Object, error) {
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objects := []runtime.Object{}
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for _, info := range infos {
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if info.Object == nil {
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continue
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}
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// TODO: use info.VersionedObject as the value?
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switch obj := info.Object.(type) {
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case *extensions.ThirdPartyResourceData:
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objects = append(objects, &runtime.Unknown{Raw: obj.Data})
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continue
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}
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// objects that are not part of api.Scheme must be converted to JSON
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// TODO: convert to map[string]interface{}, attach to runtime.Unknown?
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if !version.Empty() {
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if _, _, err := api.Scheme.ObjectKinds(info.Object); runtime.IsNotRegisteredError(err) {
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// TODO: ideally this would encode to version, but we don't expose multiple codecs here.
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data, err := runtime.Encode(encoder, info.Object)
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if err != nil {
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return nil, err
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}
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// TODO: Set ContentEncoding and ContentType.
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objects = append(objects, &runtime.Unknown{Raw: data})
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continue
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}
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}
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converted, err := TryConvert(info.Mapping.ObjectConvertor, info.Object, version, info.Mapping.GroupVersionKind.GroupVersion())
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if err != nil {
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return nil, err
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}
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objects = append(objects, converted)
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}
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return objects, nil
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}
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// TryConvert attempts to convert the given object to the provided versions in order. This function assumes
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// the object is in internal version.
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func TryConvert(converter runtime.ObjectConvertor, object runtime.Object, versions ...schema.GroupVersion) (runtime.Object, error) {
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var last error
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for _, version := range versions {
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if version.Empty() {
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return object, nil
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}
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obj, err := converter.ConvertToVersion(object, version)
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if err != nil {
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last = err
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continue
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}
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return obj, nil
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}
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return nil, last
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}
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