June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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自定义
API
服务器
｜
231
return validation.ValidatePizzaUpdate(objPizza, oldPizza)
}
这可以用于验证所有只读字段都未发生变化。通常一个更新验证逻辑也会调
用普通的验证函数，并附加一些更新相关的检查。
在对象创建过程中，可以在验证逻辑中对对象名称的正确性进行约束，例如，
只能使用一个单词，或者不能包含非字母数字的字符。
事实上，任何
ObjectMeta
字段从技术上来说都可以自定义约束条件，尽管
这对于很多字段并不可取，因为这样做可能破坏核心
API Machinery
的行为。
很多类型的资源都对名称有约束，因为很有可能该名称会在其他对名称格式
有特殊要求的系统或者环境中使用。
但即使在自定义
API
服务器中有特殊的
ObjectMeta
验证，通用的注册表还
是会在自定义验证通过后对通用的规则进行验证。这样就可以保证我们的自
定义代码可以优先返回更确切的错误信息。
8.4.9
注册表与策略
至此，我们已经学习了如何定义
API
类型并对其进行验证。下一步是为这些
API
类型实现
REST
逻辑。从图
8-7
中可以看到，注册表是实现
API
组的核心。
k8s.io/apiserver
中的通用
REST
请求处理器会调用注册表逻辑。
8.4.9.1
通用注册表
REST
逻辑通常是由通用注册表来实现的。正如其名字所描述的，它是
k8s.io/
apiserver/pkg/registry/rest
包中对注册表接口的一个通用实现。
通用注册表为“普通”资源实现了默认的
REST
行为。几乎所有的 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.