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apply.go
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apply.go
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package kubernetes
import (
"bytes"
"context"
"io"
"path/filepath"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
yamlserializer "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
)
// GetKubeConfig gets kubeconfig.
func GetKubeConfig() (*rest.Config, error) {
config, err := rest.InClusterConfig()
if err != nil {
kubeconfig := filepath.Join(homedir.HomeDir(), ".kube", "config")
config, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, err
}
}
return config, nil
}
// ApplyYaml applies the manifests into Kubernetes cluster.
func ApplyYaml(manifests string) error {
config, err := GetKubeConfig()
if err != nil {
return err
}
// Create a new clientset which include all needed client APIs
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
dynamicclient, err := dynamic.NewForConfig(config)
if err != nil {
return err
}
// Decode the yaml file into a Kubernetes object
decode := yaml.NewYAMLOrJSONDecoder(bytes.NewReader([]byte(manifests)), 100)
for {
var rawObj runtime.RawExtension
if err = decode.Decode(&rawObj); err != nil {
if err == io.EOF {
break
}
return err
}
obj, gvk, err := yamlserializer.NewDecodingSerializer(unstructured.UnstructuredJSONScheme).Decode(rawObj.Raw, nil, nil)
if err != nil {
return err
}
unstructuredMap, err := runtime.DefaultUnstructuredConverter.ToUnstructured(obj)
if err != nil {
return err
}
unstructuredObj := &unstructured.Unstructured{Object: unstructuredMap}
if unstructuredObj.GetNamespace() == "" {
unstructuredObj.SetNamespace("default")
}
grs, err := restmapper.GetAPIGroupResources(clientset.Discovery())
if err != nil {
return err
}
mapping, err := restmapper.NewDiscoveryRESTMapper(grs).RESTMapping(gvk.GroupKind(), gvk.Version)
if err != nil {
return err
}
var dri dynamic.ResourceInterface
if mapping.Scope.Name() == meta.RESTScopeNameNamespace {
dri = dynamicclient.Resource(mapping.Resource).Namespace(unstructuredObj.GetNamespace())
} else {
dri = dynamicclient.Resource(mapping.Resource)
}
if _, err := dri.Apply(context.Background(), unstructuredObj.GetName(), unstructuredObj, metav1.ApplyOptions{FieldManager: "application/apply-patch"}); err != nil {
return err
}
}
return nil
}