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package kubernetes
import (
"context"
"errors"
"fmt"
"path/filepath"
"strings"
"github.com/go-kratos/kratos/v2/config"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
// Option is kubernetes option.
type Option func(*options)
type options struct {
// kubernetes namespace
Namespace string
// kubernetes labelSelector example `app=test`
LabelSelector string
// kubernetes fieldSelector example `app=test`
FieldSelector string
// set KubeConfig out-of-cluster Use outside cluster
KubeConfig string
// set master url
Master string
}
// Namespace with kubernetes namespace.
func Namespace(ns string) Option {
return func(o *options) {
o.Namespace = ns
}
}
// LabelSelector with kubernetes label selector.
func LabelSelector(label string) Option {
return func(o *options) {
o.LabelSelector = label
}
}
// FieldSelector with kubernetes field selector.
func FieldSelector(field string) Option {
return func(o *options) {
o.FieldSelector = field
}
}
// KubeConfig with kubernetes config.
func KubeConfig(config string) Option {
return func(o *options) {
o.KubeConfig = config
}
}
// Master with kubernetes master.
func Master(master string) Option {
return func(o *options) {
o.Master = master
}
}
type kube struct {
opts options
client *kubernetes.Clientset
}
// NewSource new a kubernetes config source.
func NewSource(opts ...Option) config.Source {
op := options{}
for _, o := range opts {
o(&op)
}
return &kube{
opts: op,
}
}
func (k *kube) init() (err error) {
var config *rest.Config
if k.opts.KubeConfig != "" {
if config, err = clientcmd.BuildConfigFromFlags(k.opts.Master, k.opts.KubeConfig); err != nil {
return err
}
} else {
if config, err = rest.InClusterConfig(); err != nil {
return err
}
}
if k.client, err = kubernetes.NewForConfig(config); err != nil {
return err
}
return nil
}
func (k *kube) load() (kvs []*config.KeyValue, err error) {
cmList, err := k.client.
CoreV1().
ConfigMaps(k.opts.Namespace).
List(context.Background(), metav1.ListOptions{
LabelSelector: k.opts.LabelSelector,
FieldSelector: k.opts.FieldSelector,
})
if err != nil {
return nil, err
}
for _, cm := range cmList.Items {
kvs = append(kvs, k.configMap(cm)...)
}
return kvs, nil
}
func (k *kube) configMap(cm v1.ConfigMap) (kvs []*config.KeyValue) {
for name, val := range cm.Data {
k := fmt.Sprintf("%s/%s/%s", k.opts.Namespace, cm.Name, name)
kvs = append(kvs, &config.KeyValue{
Key: k,
Value: []byte(val),
Format: strings.TrimPrefix(filepath.Ext(k), "."),
})
}
return kvs
}
func (k *kube) Load() ([]*config.KeyValue, error) {
if k.opts.Namespace == "" {
return nil, errors.New("options namespace not full")
}
if err := k.init(); err != nil {
return nil, err
}
return k.load()
}
func (k *kube) Watch() (config.Watcher, error) {
return newWatcher(k)
}