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42 lines
3.2 KiB
Markdown
42 lines
3.2 KiB
Markdown
# Generation and release cycle of clientset
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Client-gen is an automatic tool that generates [clientset](../../docs/proposals/client-package-structure.md#high-level-client-sets) based on API types. This doc introduces the use the client-gen, and the release cycle of the generated clientsets.
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## Using client-gen
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The workflow includes three steps:
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1. Marking API types with tags: in `pkg/apis/${GROUP}/${VERSION}/types.go`, mark the types (e.g., Pods) that you want to generate clients for with the `// +genclient=true` tag. If the resource associated with the type is not namespace scoped (e.g., PersistentVolume), you need to append the `nonNamespaced=true` tag as well.
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2.
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- a. If you are developing in the k8s.io/kubernetes repository, you just need to run hack/update-codegen.sh.
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- b. If you are running client-gen outside of k8s.io/kubernetes, you need to use the command line argument `--input` to specify the groups and versions of the APIs you want to generate clients for, client-gen will then look into `pkg/apis/${GROUP}/${VERSION}/types.go` and generate clients for the types you have marked with the `genclient` tags. For example, to generated a clientset named "my_release" including clients for api/v1 objects and extensions/v1beta1 objects, you need to run:
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```
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$ client-gen --input="api/v1,extensions/v1beta1" --clientset-name="my_release"
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```
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3. ***Adding expansion methods***: client-gen only generates the common methods, such as CRUD. You can manually add additional methods through the expansion interface. For example, this [file](../../pkg/client/clientset_generated/release_1_5/typed/core/v1/pod_expansion.go) adds additional methods to Pod's client. As a convention, we put the expansion interface and its methods in file ${TYPE}_expansion.go. In most cases, you don't want to remove existing expansion files. So to make life easier, instead of creating a new clientset from scratch, ***you can copy and rename an existing clientset (so that all the expansion files are copied)***, and then run client-gen.
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## Output of client-gen
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- clientset: the clientset will be generated at `pkg/client/clientset_generated/` by default, and you can change the path via the `--clientset-path` command line argument.
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- Individual typed clients and client for group: They will be generated at `pkg/client/clientset_generated/${clientset_name}/typed/generated/${GROUP}/${VERSION}/`
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## Released clientsets
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If you are contributing code to k8s.io/kubernetes, try to use the release_X_Y clientset in this [directory](../../pkg/client/clientset_generated/).
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If you need a stable Go client to build your own project, please refer to the [client-go repository](https://github.com/kubernetes/client-go).
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We are migrating k8s.io/kubernetes to use client-go as well, see issue [#35159](https://github.com/kubernetes/kubernetes/issues/35159).
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS --> []() <!-- END MUNGE: GENERATED_ANALYTICS -->
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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