87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
package k8s
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import (
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"context"
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"flag"
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"fmt"
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"os"
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"path/filepath"
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"github.com/TwinProduction/gatus/k8stest"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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)
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// KubernetesClientApi is a minimal interface for interacting with Kubernetes
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// Created mostly to make mocking the Kubernetes client easier
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type KubernetesClientApi interface {
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GetServices(namespace string) ([]v1.Service, error)
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}
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// KubernetesClient is a working implementation of KubernetesClientApi
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type KubernetesClient struct {
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client *kubernetes.Clientset
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}
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// GetServices returns a list of services for a given namespace
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func (k *KubernetesClient) GetServices(namespace string) ([]v1.Service, error) {
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services, err := k.client.CoreV1().Services(namespace).List(context.TODO(), metav1.ListOptions{})
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if err != nil {
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return nil, err
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}
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return services.Items, nil
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}
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// NewKubernetesClient creates a KubernetesClient
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func NewKubernetesClient(client *kubernetes.Clientset) *KubernetesClient {
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return &KubernetesClient{
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client: client,
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}
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}
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// NewClient creates a Kubernetes client for the given ClusterMode
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func NewClient(clusterMode ClusterMode) (KubernetesClientApi, error) {
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var kubeConfig *rest.Config
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var err error
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switch clusterMode {
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case ClusterModeIn:
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kubeConfig, err = rest.InClusterConfig()
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case ClusterModeOut:
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kubeConfig, err = getOutClusterConfig()
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case ClusterModeMock:
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return k8stest.GetMockedKubernetesClient(), nil
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default:
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return nil, fmt.Errorf("invalid cluster mode, try '%s' or '%s'", ClusterModeIn, ClusterModeOut)
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}
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if err != nil {
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return nil, fmt.Errorf("unable to get cluster config for mode '%s': %s", clusterMode, err.Error())
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}
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client, err := kubernetes.NewForConfig(kubeConfig)
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if err != nil {
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return nil, err
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}
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return NewKubernetesClient(client), nil
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}
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func homeDir() string {
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if h := os.Getenv("HOME"); h != "" {
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return h
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}
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return os.Getenv("USERPROFILE") // windows
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}
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func getOutClusterConfig() (*rest.Config, error) {
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var kubeConfig *string
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if home := homeDir(); home != "" {
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kubeConfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
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} else {
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kubeConfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
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}
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flag.Parse()
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return clientcmd.BuildConfigFromFlags("", *kubeConfig)
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}
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