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78 lines
3.1 KiB
Go
78 lines
3.1 KiB
Go
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/*
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Copyright 2020 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 client
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import (
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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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)
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// Object is a Kubernetes object, allows functions to work indistinctly with
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// any resource that implements both Object interfaces.
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//
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// Semantically, these are objects which are both serializable (runtime.Object)
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// and identifiable (metav1.Object) -- think any object which you could write
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// as YAML or JSON, and then `kubectl create`.
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//
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// Code-wise, this means that any object which embeds both ObjectMeta (which
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// provides metav1.Object) and TypeMeta (which provides half of runtime.Object)
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// and has a `DeepCopyObject` implementation (the other half of runtime.Object)
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// will implement this by default.
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//
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// For example, nearly all the built-in types are Objects, as well as all
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// KubeBuilder-generated CRDs (unless you do something real funky to them).
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//
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// By and large, most things that implement runtime.Object also implement
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// Object -- it's very rare to have *just* a runtime.Object implementation (the
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// cases tend to be funky built-in types like Webhook payloads that don't have
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// a `metadata` field).
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//
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// Notice that XYZList types are distinct: they implement ObjectList instead.
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type Object interface {
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metav1.Object
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runtime.Object
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}
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// ObjectList is a Kubernetes object list, allows functions to work
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// indistinctly with any resource that implements both runtime.Object and
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// metav1.ListInterface interfaces.
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//
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// Semantically, this is any object which may be serialized (ObjectMeta), and
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// is a kubernetes list wrapper (has items, pagination fields, etc) -- think
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// the wrapper used in a response from a `kubectl list --output yaml` call.
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//
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// Code-wise, this means that any object which embedds both ListMeta (which
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// provides metav1.ListInterface) and TypeMeta (which provides half of
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// runtime.Object) and has a `DeepCopyObject` implementation (the other half of
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// runtime.Object) will implement this by default.
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//
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// For example, nearly all the built-in XYZList types are ObjectLists, as well
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// as the XYZList types for all KubeBuilder-generated CRDs (unless you do
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// something real funky to them).
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//
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// By and large, most things that are XYZList and implement runtime.Object also
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// implement ObjectList -- it's very rare to have *just* a runtime.Object
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// implementation (the cases tend to be funky built-in types like Webhook
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// payloads that don't have a `metadata` field).
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//
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// This is similar to Object, which is almost always implemented by the items
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// in the list themselves.
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type ObjectList interface {
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metav1.ListInterface
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runtime.Object
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}
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