mirror of https://github.com/k3s-io/k3s
94 lines
3.7 KiB
Go
94 lines
3.7 KiB
Go
/*
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Copyright 2016 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 apimachinery
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/api/meta"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/runtime"
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)
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// GroupMeta stores the metadata of a group.
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type GroupMeta struct {
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// GroupVersion represents the preferred version of the group.
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GroupVersion unversioned.GroupVersion
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// GroupVersions is Group + all versions in that group.
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GroupVersions []unversioned.GroupVersion
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// Codec is the default codec for serializing output that should use
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// the preferred version. Use this Codec when writing to
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// disk, a data store that is not dynamically versioned, or in tests.
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// This codec can decode any object that the schema is aware of.
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Codec runtime.Codec
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// SelfLinker can set or get the SelfLink field of all API types.
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// TODO: when versioning changes, make this part of each API definition.
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// TODO(lavalamp): Combine SelfLinker & ResourceVersioner interfaces, force all uses
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// to go through the InterfacesFor method below.
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SelfLinker runtime.SelfLinker
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// RESTMapper provides the default mapping between REST paths and the objects declared in api.Scheme and all known
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// versions.
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RESTMapper meta.RESTMapper
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// InterfacesFor returns the default Codec and ResourceVersioner for a given version
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// string, or an error if the version is not known.
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// TODO: make this stop being a func pointer and always use the default
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// function provided below once every place that populates this field has been changed.
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InterfacesFor func(version unversioned.GroupVersion) (*meta.VersionInterfaces, error)
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// InterfacesByVersion stores the per-version interfaces.
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InterfacesByVersion map[unversioned.GroupVersion]*meta.VersionInterfaces
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}
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// DefaultInterfacesFor returns the default Codec and ResourceVersioner for a given version
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// string, or an error if the version is not known.
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// TODO: Remove the "Default" prefix.
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func (gm *GroupMeta) DefaultInterfacesFor(version unversioned.GroupVersion) (*meta.VersionInterfaces, error) {
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if v, ok := gm.InterfacesByVersion[version]; ok {
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return v, nil
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}
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return nil, fmt.Errorf("unsupported storage version: %s (valid: %v)", version, gm.GroupVersions)
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}
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// AddVersionInterfaces adds the given version to the group. Only call during
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// init, after that GroupMeta objects should be immutable. Not thread safe.
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// (If you use this, be sure to set .InterfacesFor = .DefaultInterfacesFor)
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// TODO: remove the "Interfaces" suffix and make this also maintain the
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// .GroupVersions member.
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func (gm *GroupMeta) AddVersionInterfaces(version unversioned.GroupVersion, interfaces *meta.VersionInterfaces) error {
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if e, a := gm.GroupVersion.Group, version.Group; a != e {
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return fmt.Errorf("got a version in group %v, but am in group %v", a, e)
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}
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if gm.InterfacesByVersion == nil {
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gm.InterfacesByVersion = make(map[unversioned.GroupVersion]*meta.VersionInterfaces)
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}
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gm.InterfacesByVersion[version] = interfaces
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// TODO: refactor to make the below error not possible, this function
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// should *set* GroupVersions rather than depend on it.
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for _, v := range gm.GroupVersions {
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if v == version {
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return nil
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}
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}
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return fmt.Errorf("added a version interface without the corresponding version %v being in the list %#v", version, gm.GroupVersions)
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}
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