go语言代码生成器code generator使用示例介绍_Golang_

$ git clone https://github.com/kubernetes/code-generator.git $ git checkout 0.23.3 

# 进行安装 $ go install ./cmd/{client-gen,deepcopy-gen,informer-gen,lister-gen} # 获取GOPATH路径 $ go env | grep GOPATH GOPATH="/Users/Christian/go" # 查看 ls /Users/Christian/go/bin client-gen deepcopy-gen goimports lister-gen controller-gen defaulter-gen informer-gen type-scaffold

$ mkdir operator-test && cd operator-test $ go mod init operator-test $ mkdir -p pkg/apis/example.com/v1 ➜ operator-test tree . ├── go.mod ├── go.sum └── pkg └── apis └── example.com └── v1 ├── doc.go ├── register.go └── types.go 4 directories, 5 files 

// pkg/crd.example.com/v1/doc.go // +k8s:deepcopy-gen=package // +groupName=example.com package v1

// pkg/crd.example.com/v1/types.go package v1 import metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" // +genclient // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object // Bar is a specification for a Bar resource type Bar struct { metav1.TypeMeta `json:",inline"` metav1.ObjectMeta `json:"metadata,omitempty"` Spec BarSpec `json:"spec"` // Status BarStatus `json:"status"` } // BarSpec is the spec for a Bar resource type BarSpec struct { DeploymentName string `json:"deploymentName"` Image string `json:"image"` Replicas *int32 `json:"replicas"` } // BarStatus is the status for a Bar resource type BarStatus struct { AvailableReplicas int32 `json:"availableReplicas"` } // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object // BarList is a list of Bar resources type BarList struct { metav1.TypeMeta `json:",inline" :"metav1.TypeMeta"` metav1.ListMeta `json:"metadata" :"metav1.ListMeta"` Items []Bar `json:"items" :"items"` } 

package v1 import ( metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/runtime" "k8s.io/apimachinery/pkg/runtime/schema" ) // SchemeGroupVersion is group version used to register these objects var SchemeGroupVersion = schema.GroupVersion{Group: "example.com", Version: "v1"} // Kind takes an unqualified kind and returns back a Group qualified GroupKind func Kind(kind string) schema.GroupKind { return SchemeGroupVersion.WithKind(kind).GroupKind() } // Resource takes an unqualified resource and returns a Group qualified GroupResource func Resource(resource string) schema.GroupResource { return SchemeGroupVersion.WithResource(resource).GroupResource() } var ( // SchemeBuilder initializes a scheme builder SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes) // AddToScheme is a global function that registers this API group & version to a scheme AddToScheme = SchemeBuilder.AddToScheme ) // Adds the list of known types to Scheme. func addKnownTypes(scheme *runtime.Scheme) error { scheme.AddKnownTypes(SchemeGroupVersion, &Bar{}, &BarList{}, ) metav1.AddToGroupVersion(scheme, SchemeGroupVersion) return nil } 

# 运行 code-generator/generate-group.sh ./../../github/code-generator/generate-groups.sh all \ # 指定 group 和 version，生成deeplycopy以及client operator-test/pkg/client operator-test/pkg/apis crd.example.com:v1 \ # 指定头文件 --go-header-file=./hack/boilerplate.go.txt \ # 指定输出位置，默认为GOPATH --output-base ../ Generating deepcopy funcs Generating clientset for crd.example.com:v1 at operator-test/pkg/client/clientset Generating listers for crd.example.com:v1 at operator-test/pkg/client/listers Generating informers for crd.example.com:v1 at operator-test/pkg/client/informers 

➜ operator-test tree . ├── go.mod ├── go.sum ├── hack │ └── boilerplate.go.txt └── pkg ├── apis │ └── crd.example.com │ └── v1 │ ├── doc.go │ ├── register.go │ ├── types.go │ └── zz_generated.deepcopy.go └── client ├── clientset │ └── versioned │ ├── clientset.go │ ├── doc.go │ ├── fake │ │ ├── clientset_generated.go │ │ ├── doc.go │ │ └── register.go │ ├── scheme │ │ ├── doc.go │ │ └── register.go │ └── typed │ └── crd.example.com │ └── v1 │ ├── bar.go │ ├── crd.example.com_client.go │ ├── doc.go │ ├── fake │ │ ├── doc.go │ │ ├── fake_bar.go │ │ └── fake_crd.example.com_client.go │ └── generated_expansion.go ├── informers │ └── externalversions │ ├── crd.example.com │ │ ├── interface.go │ │ └── v1 │ │ ├── bar.go │ │ └── interface.go │ ├── factory.go │ ├── generic.go │ └── internalinterfaces │ └── factory_interfaces.go └── listers └── crd.example.com └── v1 ├── bar.go └── expansion_generated.go 22 directories, 29 files 

# manifests/example.com_bars.yaml --- apiVersion: apiextensions.k8s.io/v1 kind: CustomResourceDefinition metadata: annotations: controller-gen.kubebuilder.io/version: (devel) creationTimestamp: null name: bars.crd.example.com spec: group: crd.example.com names: kind: Bar listKind: BarList plural: bars singular: bar scope: Namespaced versions: - name: v1 schema: openAPIV3Schema: description: Bar is a specification for a Bar resource properties: apiVersion: description: 'APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources' type: string kind: description: 'Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the generated submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds' type: string metadata: type: object spec: description: BarSpec is the spec for a Bar resource properties: deploymentName: type: string image: type: string replicas: format: int32 type: integer required: - deploymentName - image - replicas type: object required: - spec type: object served: true storage: true # manifests/cr.yaml --- apiVersion: crd.example.com/v1 kind: Bar metadata: name: bar-demo namespace: default spec: image: "nginx:1.17.1" deploymentName: example-bar replicas: 2

package main import ( "context" "fmt" v1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/client-go/tools/cache" "k8s.io/client-go/tools/clientcmd" "log" clientSet "operator-test/pkg/client/clientset/versioned" "operator-test/pkg/client/informers/externalversions" ) func main() { config, err := clientcmd.B
                
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