| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package k8sclient |
| 4 | |
| 5 | import ( |
| 6 | "errors" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | |
| 10 | "k8s.io/client-go/kubernetes" |
| 11 | "k8s.io/client-go/kubernetes/fake" |
| 12 | "k8s.io/client-go/rest" |
| 13 | "k8s.io/client-go/tools/clientcmd" |
| 14 | |
| 15 | _ "k8s.io/client-go/plugin/pkg/client/auth/gcp" |
| 16 | ) |
| 17 | |
| 18 | const ( |
| 19 | EnvFakeClient = "KUBERNETES_FAKE_CLIENTSET" |
| 20 | defaultUserAgent = "Netdata/k8s-client" |
| 21 | ) |
| 22 | |
| 23 | func New(userAgent string) (kubernetes.Interface, error) { |
| 24 | if userAgent == "" { |
| 25 | userAgent = defaultUserAgent |
| 26 | } |
| 27 | |
| 28 | switch { |
| 29 | case os.Getenv(EnvFakeClient) != "": |
| 30 | return fake.NewClientset(), nil |
| 31 | case os.Getenv("KUBERNETES_SERVICE_HOST") != "" && os.Getenv("KUBERNETES_SERVICE_PORT") != "": |
| 32 | return newInCluster(userAgent) |
| 33 | default: |
| 34 | return newOutOfCluster(userAgent) |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | func newInCluster(userAgent string) (*kubernetes.Clientset, error) { |
| 39 | config, err := rest.InClusterConfig() |
| 40 | if err != nil { |
| 41 | return nil, err |
| 42 | } |
| 43 | |
| 44 | config.UserAgent = userAgent |
| 45 | |
| 46 | return kubernetes.NewForConfig(config) |
| 47 | } |
| 48 | |
| 49 | func newOutOfCluster(userAgent string) (*kubernetes.Clientset, error) { |
| 50 | home := homeDir() |
| 51 | if home == "" { |
| 52 | return nil, errors.New("couldn't find home directory") |
| 53 | } |
| 54 | |
| 55 | path := filepath.Join(home, ".kube", "config") |
| 56 | config, err := clientcmd.BuildConfigFromFlags("", path) |
| 57 | if err != nil { |
| 58 | return nil, err |
| 59 | } |
| 60 | |
| 61 | config.UserAgent = userAgent |
| 62 | |
| 63 | return kubernetes.NewForConfig(config) |
| 64 | } |
| 65 | |
| 66 | func homeDir() string { |
| 67 | if h := os.Getenv("HOME"); h != "" { |
| 68 | return h |
| 69 | } |
| 70 | return os.Getenv("USERPROFILE") // windows |
| 71 | } |