June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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220
｜
第
8
章
客户端已被废弃并将逐渐消失。在未来，即使是
API
服务器里的代码也会用
一个外部版本的客户端来实现。
8.4.5
转换
转换用于将某个版本的对象转成另一个版本。转换是通过转换函数实现的，
转换函数可以是自己手写的（按惯例是放在
pkg/apis/
group-name
/version/
conversion.go
文件中），也可以是通过
conversion-gen
自动生成的（按惯例
是放在
pkg/apis/
group-name
/
version
/zz_generated.conversion.go
文件中）。
转换函数通过
Scheme
（参考“
3.5.4 Scheme
”）的
Convert()
函数来调用，
传入源对象和目标对象：
func (s *Scheme) Convert(in, out interface{}, context interface{}) error
context
的描述如下
:
// ...an optional field that callers may use to pass info to conversion functions.
它只在极特殊的场景里使用，大部分情况下传
nil
即可。本章后续的内容中
我们会关注于转换函数部分，这会涉及在转换函数里访问
context
。
为了完成实际的转换逻辑，
Scheme
需要知道所有的
Golang API
类型、它们
的
GroupVersionKind
，以及不同
GroupVersionKind
之间的转换函数。为了做
到这些，
conversion-gen ...
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