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client.go
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client.go
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package kubeops
import (
"fmt"
"github.com/hashicorp/go-hclog"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
// generateKubernetsClient - generates a kubernetes client set from default file locations
// first checks KUBECONFIG environment variable
// then the Home directory of the user
// then finally it checks if the program is running in a Pod
func generateKubernetesClient() (kubernetes.Interface, error) {
config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
clientcmd.NewDefaultClientConfigLoadingRules(), nil,
).ClientConfig()
if err != nil {
if restConfig, err := rest.InClusterConfig(); err == nil {
config = restConfig
} else {
return nil, fmt.Errorf("failed to build kubeconfig or InClusterConfig: %w", err)
}
}
k8sClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, fmt.Errorf("failed to create kubernetes client: %w", err)
}
return k8sClient, nil
}
// genK8sClientFromKubeConfigFile - Generates kubernetes config file from user supplied kubeConfigPath file
func genK8sClientFromKubeConfigFile(kubeConfigPath string) (kubernetes.Interface, error) {
config, err := clientcmd.BuildConfigFromFlags("", kubeConfigPath)
if err != nil {
return nil, fmt.Errorf("failed to build kubeconfig from file %s: %w", kubeConfigPath, err)
}
k8sClient, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, fmt.Errorf("failed to create kubernetes client from file %s: %w", kubeConfigPath, err)
}
return k8sClient, nil
}
// Service exposes the operations on various K8s resources
type Service struct {
Client kubernetes.Interface // kubernetes client-set
Log hclog.Logger // logger embedded in our service
}
// New - builds a new Service that can interface with Kubernetes
func New(client kubernetes.Interface, l hclog.Logger) *Service {
return &Service{
Client: client,
Log: l,
}
}
// NewDefaultService - builds a new Service looking for a KubeConfig in various locations
func NewDefaultService(l hclog.Logger) (*Service, error) {
clientSet, err := generateKubernetesClient()
if err != nil {
return &Service{}, err
}
return &Service{
Client: clientSet,
Log: l,
}, nil
}
// NewServiceFromKubeConfigFile - builds a new Service using KubeConfig file location passed by the caller
func NewServiceFromKubeConfigFile(kubeConfigPath string, l hclog.Logger) (*Service, error) {
clientSet, err := genK8sClientFromKubeConfigFile(kubeConfigPath)
if err != nil {
return &Service{}, err
}
return &Service{
Client: clientSet,
Log: l,
}, nil
}