June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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86
｜
第
3
章
RESTMapper
接口有很多种不同的实现。对于客户端应用来说，最重要的一种
实现是基于发现机制的
DeferredDiscoveryRESTMapper
，它在
k8s.io/client-go/
restmapper
包中定义：它使用来自
Kubernetes API
服务器的发现信息动态地
创建
REST
映射。它也可以支持非核心的资源，比如自定义资源。
3.5.4
Scheme
最后要介绍的
Kubernetes
类型系统中的核心概念是
Scheme
，它位于
k8s.io/
apimachinery/pkg/runtime
包中。
Scheme
用于把
Golang
和实现无关的
GVK
关联起来。
Scheme
的主要功能是
对
Golang
类型与可能的
GVK
之间建立映射：
func (s *Scheme) ObjectKinds(obj Object) ([]schema.GroupVersionKind, bool,
error)
在“
3.2 Go
语言中的
Kubernetes
对象”中我们了解到，对象可以通过
GetObjectKind() schema.ObjectKind
方法返回它所属的组和型别。但是，这
些返回值在大部分时候都是空值，所以对于识别一个对象的型别基本上没什
么用。
Scheme
则是通过
Go
语言中的反射机制来返回某个对象的类型，并将其与一
个注册过的该类型的
GVK
进行映射。为了实现这一点，
Golang
的类型需要
通过下面的方法注册
Scheme
中：
scheme.AddKnownTypes(schema.GroupVersionKind{"", ...
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