kubebuilder & code-generator（四）

前言

前面几节介绍了 kubebuilder 帮我们初始化了工程脚手架、生成 api、controller 代码、生成 manifest 文件，但是对 k8s 的开发使用仍然存在不足， 引入 code-generator（另一个代码生成的框架）能帮我们做更多事情：快速的生成Informers,Clientset, listers，灵活自定义 workqueue消费k8s产生的事件。

安装

code-generator/... 需要下载 code-generator 包下的所有东西

 go get -u -v k8s.io/code-generator/...
//  go get -u -v k8s.io/code-generator 只会下载代码中依赖的

遇到下面错误

go get: github.com/googleapis/gnostic@v0.5.5 updating to
        github.com/googleapis/gnostic@v0.5.7: parsing go.mod:
        module declares its path as: github.com/google/gnostic
                but was required as: github.com/googleapis/gnostic

解决办法
go.mod 文件新增下面一条 replace

replace (
 github.com/googleapis/gnostic => github.com/google/gnostic v0.5.7
)

使用

$ vendor/k8s.io/code-generator/generate-groups.sh all \
gitee.com/kubeclub/pkg/client \ github.com/openshift-evangelist/crd-code-generation/pkg/apis \
example.com:v1

参数说明

Usage: $(basename "$0") <generators> <output> <apis> <groups> ...

  <generators>        the generators comma separated to run (deepcopy,defaulter,client,lister,informer) or "all".
  <output>    the output package name (e.g. github.com/example/project/pkg/generated).
  <apis>      the external types dir (e.g. github.com/example/api or github.com/example/project/pkg/apis).
  <groups>   the groups and their versions in the format "groupA:v1,v2 groupB:v1 groupC:v2", relative
                      to <api>.
  ...                 arbitrary flags passed to all generator binaries.

自动生成如下文件

参考文档

https://cloud.redhat.com/blog/kubernetes-deep-dive-code-generation-customresources