From 4536b460f1e79dec3eb7e4170604332b4854e220 Mon Sep 17 00:00:00 2001 From: yuemoxi <99347745@qq.com> Date: Mon, 30 Aug 2021 23:23:00 +0800 Subject: [PATCH] feat: move kute to kratos (#1383) * feat: move kute to kratos --- config/kube/README.md | 35 +++ config/kube/config.go | 139 ++++++++++ config/kube/config_test.go | 24 ++ config/kube/example.go | 40 +++ config/kube/go.mod | 12 + config/kube/go.sum | 489 +++++++++++++++++++++++++++++++++++ config/kube/watcher.go | 60 +++++ config/kube/watcher_test.go | 44 ++++ registry/kute/go.mod | 13 + registry/kute/go.sum | 491 ++++++++++++++++++++++++++++++++++++ registry/kute/registry.go | 422 +++++++++++++++++++++++++++++++ 11 files changed, 1769 insertions(+) create mode 100644 config/kube/README.md create mode 100644 config/kube/config.go create mode 100644 config/kube/config_test.go create mode 100644 config/kube/example.go create mode 100644 config/kube/go.mod create mode 100644 config/kube/go.sum create mode 100644 config/kube/watcher.go create mode 100644 config/kube/watcher_test.go create mode 100644 registry/kute/go.mod create mode 100644 registry/kute/go.sum create mode 100644 registry/kute/registry.go diff --git a/config/kube/README.md b/config/kube/README.md new file mode 100644 index 000000000..0345db1c7 --- /dev/null +++ b/config/kube/README.md @@ -0,0 +1,35 @@ +# kube +Kubernetes is a service discovery. + +### kube集群内部署 +集群内部署需要权限 +kubectl执行 +> serviceaccount 请调整为实际环境account。在未指定spec.serviceAccount情况下默认为namespace::default +``` +kubectl create clusterrolebinding go-kratos:kube --clusterrole=view --serviceaccount=mesh:default +``` +或者 kubect apply -f bind-role.yaml +```yaml +apiVersion: rbac.authorization.k8s.io/v1 +kind: ClusterRoleBinding +metadata: + name: go-kratos:kube +roleRef: + apiGroup: rbac.authorization.k8s.io + kind: ClusterRole + name: view +subjects: +- kind: ServiceAccount + name: default + namespace: mesh +``` + +### 集群外运行 +> 指定 .kube 文件访问 +```go + config.NewSource(SourceOption{ + Namespace: "mesh", + LabelSelector: "", + KubeConfig: filepath.Join(homedir.HomeDir(), ".kube", "config"), + }) +``` \ No newline at end of file diff --git a/config/kube/config.go b/config/kube/config.go new file mode 100644 index 000000000..379fc17dd --- /dev/null +++ b/config/kube/config.go @@ -0,0 +1,139 @@ +package main + +import ( + "context" + "errors" + "fmt" + + "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 kube option. +type Option func(*options) + +type options struct { + // kube namespace + Namespace string + // kube labelSelector example `app=test` + LabelSelector string + // kube fieldSelector example `app=test` + FieldSelector string + // set KubeConfig out-of-cluster Use outside cluster + KubeConfig string + // set master url + Master string +} + +// Namespace with kube namespace. +func Namespace(ns string) Option { + return func(o *options) { + o.Namespace = ns + } +} + +// LabelSelector with kube label selector. +func LabelSelector(label string) Option { + return func(o *options) { + o.LabelSelector = label + } +} + +// FieldSelector with kube field selector. +func FieldSelector(field string) Option { + return func(o *options) { + o.FieldSelector = field + } +} + +// KubeConfig with kube config. +func KubeConfig(config string) Option { + return func(o *options) { + o.KubeConfig = config + } +} + +// Master with kube master. +func Master(master string) Option { + return func(o *options) { + o.Master = master + } +} + +type kube struct { + opts options + client *kubernetes.Clientset +} + +// NewSource new a kube config source. +func NewSource(opts ...Option) config.Source { + options := options{} + for _, o := range opts { + o(&options) + } + return &kube{ + opts: options, + } +} + +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 { + kvs = append(kvs, &config.KeyValue{ + Key: fmt.Sprintf("%s/%s/%s", k.opts.Namespace, cm.Name, name), + Value: []byte(val), + }) + } + 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) +} diff --git a/config/kube/config_test.go b/config/kube/config_test.go new file mode 100644 index 000000000..6bd3a5885 --- /dev/null +++ b/config/kube/config_test.go @@ -0,0 +1,24 @@ +package main + +import ( + "path/filepath" + "testing" + + "k8s.io/client-go/util/homedir" +) + +func TestSource(t *testing.T) { + home := homedir.HomeDir() + s := NewSource( + Namespace("mesh"), + LabelSelector(""), + KubeConfig(filepath.Join(home, ".kube", "config")), + ) + kvs, err := s.Load() + if err != nil { + t.Error(err) + } + for _, v := range kvs { + t.Log(v) + } +} diff --git a/config/kube/example.go b/config/kube/example.go new file mode 100644 index 000000000..9636e456c --- /dev/null +++ b/config/kube/example.go @@ -0,0 +1,40 @@ +package main + +import ( + "log" + "path/filepath" + + "github.com/go-kratos/kratos/v2/config" + "k8s.io/client-go/util/homedir" +) + +// 部署在mesh namespace 下configmap +const yamlData = `database: + mysql: + dsn: "root:Test@tcp(mysql.database.svc.cluster.local:3306)/test?timeout=1s&readTimeout=1s&writeTimeout=1s&parseTime=true&loc=Local&charset=utf8mb4,utf8" + active: 20 + idle: 10 + idle_timeout: 3600 + redis: + addr: "redis-master.redis.svc.cluster.local:6379" + password: "" + db: 4` + +const yamlApp = `application: + expire: 3600` + +func main() { + conf := config.New( + config.WithSource( + NewSource( + Namespace("mesh"), + LabelSelector("app=test"), + KubeConfig(filepath.Join(homedir.HomeDir(), ".kube", "config")), + ), + ), + ) + err := conf.Load() + if err != nil { + log.Panic(err) + } +} diff --git a/config/kube/go.mod b/config/kube/go.mod new file mode 100644 index 000000000..bdf0f531f --- /dev/null +++ b/config/kube/go.mod @@ -0,0 +1,12 @@ +module github.com/go-kratos/kratos/config/kube/v2 + +go 1.15 + +require ( + github.com/go-kratos/kratos/v2 v2.0.0-rc3 + k8s.io/api v0.21.1 + k8s.io/apimachinery v0.21.1 + k8s.io/client-go v0.21.1 +) + +replace github.com/go-kratos/kratos/v2 => ../../../kratos diff --git a/config/kube/go.sum b/config/kube/go.sum new file mode 100644 index 000000000..81eb4f3b0 --- /dev/null +++ b/config/kube/go.sum @@ -0,0 +1,489 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= 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h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw= +sigs.k8s.io/structured-merge-diff/v4 v4.1.0 h1:C4r9BgJ98vrKnnVCjwCSXcWjWe0NKcUQkmzDXZXGwH8= +sigs.k8s.io/structured-merge-diff/v4 v4.1.0/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw= +sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= +sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= diff --git a/config/kube/watcher.go b/config/kube/watcher.go new file mode 100644 index 000000000..e3d237440 --- /dev/null +++ b/config/kube/watcher.go @@ -0,0 +1,60 @@ +package main + +import ( + "context" + "fmt" + + "github.com/go-kratos/kratos/v2/config" + v1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/watch" +) + +type watcher struct { + k *kube + watcher watch.Interface +} + +func newWatcher(k *kube) (config.Watcher, error) { + w, err := k.client.CoreV1().ConfigMaps(k.opts.Namespace).Watch(context.Background(), metav1.ListOptions{ + LabelSelector: k.opts.LabelSelector, + FieldSelector: k.opts.FieldSelector, + }) + if err != nil { + return nil, err + } + return &watcher{ + k: k, + watcher: w, + }, nil +} + +func (w *watcher) Next() ([]*config.KeyValue, error) { +ResultChan: + ch := <-w.watcher.ResultChan() + if ch.Object == nil { + // 重新获取watcher + k8sWatcher, err := w.k.client.CoreV1().ConfigMaps(w.k.opts.Namespace).Watch(context.Background(), metav1.ListOptions{ + LabelSelector: w.k.opts.LabelSelector, + FieldSelector: w.k.opts.FieldSelector, + }) + if err != nil { + return nil, err + } + w.watcher = k8sWatcher + goto ResultChan + } + cm, ok := ch.Object.(*v1.ConfigMap) + if !ok { + return nil, fmt.Errorf("kube Object not ConfigMap") + } + if ch.Type == "DELETED" { + return nil, fmt.Errorf("kube configmap delete %s", cm.Name) + } + return w.k.configMap(*cm), nil +} + +func (w *watcher) Stop() error { + w.watcher.Stop() + return nil +} diff --git a/config/kube/watcher_test.go b/config/kube/watcher_test.go new file mode 100644 index 000000000..0e6ec39d7 --- /dev/null +++ b/config/kube/watcher_test.go @@ -0,0 +1,44 @@ +package main + +import ( + "context" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/clientcmd" + "k8s.io/client-go/util/homedir" + "path/filepath" + "testing" + "time" +) + +func TestKube(t *testing.T) { + home := homedir.HomeDir() + config, err := clientcmd.BuildConfigFromFlags("", filepath.Join(home, ".kube", "config")) + if err != nil { + t.Error(err) + } + client, err := kubernetes.NewForConfig(config) + if err != nil { + t.Error(err) + } + cmWatcher, err := client.CoreV1().ConfigMaps("mesh").Watch(context.Background(), metav1.ListOptions{ + LabelSelector: "app=test", + //FieldSelector: "", + }) + if err != nil { + t.Error(err) + } + go func() { + time.Sleep(5 * time.Second) + cmWatcher.Stop() + }() + for { + select { + case c := <-cmWatcher.ResultChan(): + if c.Object == nil { + return + } + t.Log(c.Type, c.Object) + } + } +} diff --git a/registry/kute/go.mod b/registry/kute/go.mod new file mode 100644 index 000000000..878ba05f4 --- /dev/null +++ b/registry/kute/go.mod @@ -0,0 +1,13 @@ +module github.com/go-kratos/kratos/registry/kube/v2 + +go 1.17 + +require ( + github.com/go-kratos/kratos/v2 v2.0.5 + github.com/json-iterator/go v1.1.11 + k8s.io/api v0.22.1 + k8s.io/apimachinery v0.22.1 + k8s.io/client-go v0.22.1 +) + +replace github.com/go-kratos/kratos/v2 => ../../../kratos \ No newline at end of file diff --git a/registry/kute/go.sum b/registry/kute/go.sum new file mode 100644 index 000000000..485c5ba86 --- /dev/null +++ b/registry/kute/go.sum @@ -0,0 +1,491 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= 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a/registry/kute/registry.go b/registry/kute/registry.go new file mode 100644 index 000000000..12582102d --- /dev/null +++ b/registry/kute/registry.go @@ -0,0 +1,422 @@ +// The package registry simply implements the Kubernetes-based Registry +package kute + +import ( + "context" + "errors" + "fmt" + "io/ioutil" + "net/url" + "os" + "strconv" + "strings" + "time" + + "github.com/go-kratos/kratos/v2/registry" + jsoniter "github.com/json-iterator/go" + corev1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/labels" + "k8s.io/apimachinery/pkg/types" + "k8s.io/client-go/informers" + "k8s.io/client-go/kubernetes" + listerv1 "k8s.io/client-go/listers/core/v1" + "k8s.io/client-go/tools/cache" +) + +// Defines the key name of specific fields +// Kratos needs to cooperate with the following fields to run properly on Kubernetes: +// kratos-service-id: define the ID of the service +// kratos-service-app: define the name of the service +// kratos-service-version: define the version of the service +// kratos-service-metadata: define the metadata of the service +// kratos-service-protocols: define the protocols of the service +// +// Example Deployment: +// +// apiVersion: apps/v1 +// kind: Deployment +// metadata: +// name: nginx +// labels: +// app: nginx +// spec: +// replicas: 5 +// selector: +// matchLabels: +// app: nginx +// template: +// metadata: +// labels: +// app: nginx +// kratos-service-id: "56991810-c77f-4a95-8190-393efa9c1a61" +// kratos-service-app: "nginx" +// kratos-service-version: "v3.5.0" +// annotations: +// kratos-service-protocols: | +// {"80": "http"} +// kratos-service-metadata: | +// {"region": "sh", "zone": "sh001", "cluster": "pd"} +// spec: +// containers: +// - name: nginx +// image: nginx:1.7.9 +// ports: +// - containerPort: 80 +// +// +const ( + // LabelsKeyServiceID is used to define the ID of the service + LabelsKeyServiceID = "kratos-service-id" + // LabelsKeyServiceName is used to define the name of the service + LabelsKeyServiceName = "kratos-service-app" + // LabelsKeyServiceVersion is used to define the version of the service + LabelsKeyServiceVersion = "kratos-service-version" + // AnnotationsKeyMetadata is used to define the metadata of the service + AnnotationsKeyMetadata = "kratos-service-metadata" + // AnnotationsKeyProtocolMap is used to define the protocols of the service + // Through the value of this field, Kratos can obtain the application layer protocol corresponding to the port + // Example value: {"80": "http", "8081": "grpc"} + AnnotationsKeyProtocolMap = "kratos-service-protocols" +) + +// The registry simply implements service discovery based on Kubernetes +// It has not been verified in the production environment and is currently for reference only +type Registry struct { + clientSet *kubernetes.Clientset + informerFactory informers.SharedInformerFactory + podInformer cache.SharedIndexInformer + podLister listerv1.PodLister + + stopCh chan struct{} +} + +// NewRegistry is used to initialize the Registry +func NewRegistry(clientSet *kubernetes.Clientset) *Registry { + informerFactory := informers.NewSharedInformerFactory(clientSet, time.Minute*10) + podInformer := informerFactory.Core().V1().Pods().Informer() + podLister := informerFactory.Core().V1().Pods().Lister() + return &Registry{ + clientSet: clientSet, + informerFactory: informerFactory, + podInformer: podInformer, + podLister: podLister, + stopCh: make(chan struct{}), + } +} + +// Register is used to register services +// Note that on Kubernetes, it can only be used to update the id/name/version/metadata/protocols of the current service, +// but it cannot be used to update node. +func (s *Registry) Register(service *registry.ServiceInstance) error { + // GetMetadata + metadataVal, err := marshal(service.Metadata) + if err != nil { + return err + } + + // Generate ProtocolMap + protocolMap, err := getProtocolMapByEndpoints(service.Endpoints) + if err != nil { + return err + } + protocolMapVal, err := marshal(protocolMap) + if err != nil { + return err + } + + patchBytes, err := jsoniter.Marshal(map[string]interface{}{ + "metadata": metav1.ObjectMeta{ + Labels: map[string]string{ + LabelsKeyServiceID: service.ID, + LabelsKeyServiceName: service.Name, + LabelsKeyServiceVersion: service.Version, + }, + Annotations: map[string]string{ + AnnotationsKeyMetadata: metadataVal, + AnnotationsKeyProtocolMap: protocolMapVal, + }, + }, + }) + if err != nil { + return err + } + + if _, err = s.clientSet. + CoreV1(). + Pods(GetNamespace()). + Patch(context.TODO(), GetPodName(), types.StrategicMergePatchType, patchBytes, metav1.PatchOptions{}); err != nil { + return err + } + return nil +} + +// Deregister the registration. +func (s *Registry) Deregister(service *registry.ServiceInstance) error { + return s.Register(®istry.ServiceInstance{ + Metadata: map[string]string{}, + }) +} + +// Service return the service instances in memory according to the service name. +func (s *Registry) Service(name string) ([]*registry.ServiceInstance, error) { + pods, err := s.podLister.List(labels.SelectorFromSet(map[string]string{ + LabelsKeyServiceName: name, + })) + if err != nil { + return nil, err + } + var ret []*registry.ServiceInstance + for _, pod := range pods { + if pod.Status.Phase != corev1.PodRunning { + continue + } + instance, err := getServiceInstanceFromPod(pod) + if err != nil { + return nil, err + } + ret = append(ret, instance) + } + return ret, nil +} + +func (s *Registry) sendLatestInstances(name string, announcement chan []*registry.ServiceInstance) { + instances, err := s.Service(name) + if err != nil { + panic(err) + } + announcement <- instances +} + +// Watch creates a watcher according to the service name. +func (s *Registry) Watch(name string) (registry.Watcher, error) { + stopCh := make(chan struct{}, 1) + announcement := make(chan []*registry.ServiceInstance, 1) + s.podInformer.AddEventHandler(cache.FilteringResourceEventHandler{ + FilterFunc: func(obj interface{}) bool { + select { + case <-stopCh: + return false + case <-s.stopCh: + return false + default: + pod := obj.(*corev1.Pod) + val := pod.GetLabels()[LabelsKeyServiceName] + return val == name + } + }, + Handler: cache.ResourceEventHandlerFuncs{ + AddFunc: func(obj interface{}) { + s.sendLatestInstances(name, announcement) + }, + UpdateFunc: func(oldObj, newObj interface{}) { + s.sendLatestInstances(name, announcement) + }, + DeleteFunc: func(obj interface{}) { + s.sendLatestInstances(name, announcement) + }, + }, + }) + return NewIterator(announcement, stopCh), nil +} + +// Start is used to start the Registry +// It is non-blocking +func (s *Registry) Start() { + s.informerFactory.Start(s.stopCh) + if !cache.WaitForCacheSync(s.stopCh, s.podInformer.HasSynced) { + return + } +} + +// Close is used to close the Registry +// After closing, any callbacks generated by Watch will not be executed +func (s *Registry) Close() { + select { + case <-s.stopCh: + default: + close(s.stopCh) + } +} + +// //////////// K8S Runtime //////////// + +// ServiceAccountNamespacePath defines the location of the namespace file +const ServiceAccountNamespacePath = "/var/run/secrets/kubernetes.io/serviceaccount/namespace" + +var currentNamespace = LoadNamespace() + +// LoadNamespace is used to get the current namespace from the file +func LoadNamespace() string { + data, err := ioutil.ReadFile(ServiceAccountNamespacePath) + if err != nil { + return "" + } + return string(data) +} + +// GetNamespace is used to get the namespace of the Pod where the current container is located +func GetNamespace() string { + return currentNamespace +} + +// GetNamespace is used to get the name of the Pod where the current container is located +func GetPodName() string { + return os.Getenv("HOSTNAME") +} + +// //////////// ProtocolMap //////////// + +type protocolMap map[string]string + +func (m protocolMap) GetProtocol(port int32) string { + return m[strconv.Itoa(int(port))] +} + +// //////////// Iterator //////////// + +// Iterator performs the conversion from channel to iterator +// It reads the latest changes from the `chan []*registry.ServiceInstance` +// And the outside can sense the closure of Iterator through stopCh +type Iterator struct { + ch chan []*registry.ServiceInstance + stopCh chan struct{} +} + +// NewIterator is used to initialize Iterator +func NewIterator(channel chan []*registry.ServiceInstance, stopCh chan struct{}) *Iterator { + return &Iterator{ + ch: channel, + stopCh: stopCh, + } +} + +// Next will block until ServiceInstance changes +func (iter *Iterator) Next() ([]*registry.ServiceInstance, error) { + select { + case instances := <-iter.ch: + return instances, nil + case <-iter.stopCh: + return nil, ErrIteratorClosed + } +} + +// Close is used to close the iterator +func (iter *Iterator) Stop() error { + select { + case <-iter.stopCh: + default: + close(iter.stopCh) + } + return nil +} + +// //////////// Helper Func //////////// + +func marshal(in interface{}) (string, error) { + return jsoniter.MarshalToString(in) +} + +func unmarshal(data string, in interface{}) error { + return jsoniter.UnmarshalFromString(data, in) +} + +func isEmptyObjectString(s string) bool { + switch s { + case "", "{}", "null", "nil", "[]": + return true + } + return false +} + +func getProtocolMapByEndpoints(endpoints []string) (protocolMap, error) { + ret := protocolMap{} + for _, endpoint := range endpoints { + u, err := url.Parse(endpoint) + if err != nil { + return nil, err + } + ret[u.Port()] = u.Scheme + } + return ret, nil +} + +func getProtocolMapFromPod(pod *corev1.Pod) (protocolMap, error) { + protocolMap := protocolMap{} + if s := pod.Annotations[AnnotationsKeyProtocolMap]; !isEmptyObjectString(s) { + err := unmarshal(s, &protocolMap) + if err != nil { + return nil, &ErrorHandleResource{Namespace: pod.Namespace, Name: pod.Name, Reason: err} + } + } + return protocolMap, nil +} + +func getMetadataFromPod(pod *corev1.Pod) (map[string]string, error) { + metadata := map[string]string{} + if s := pod.Annotations[AnnotationsKeyMetadata]; !isEmptyObjectString(s) { + err := unmarshal(s, &metadata) + if err != nil { + return nil, &ErrorHandleResource{Namespace: pod.Namespace, Name: pod.Name, Reason: err} + } + } + return metadata, nil +} + +func getServiceInstanceFromPod(pod *corev1.Pod) (*registry.ServiceInstance, error) { + podIP := pod.Status.PodIP + podLabels := pod.GetLabels() + // Get Metadata + metadata, err := getMetadataFromPod(pod) + if err != nil { + return nil, err + } + // Get Protocols Definition + protocolMap, err := getProtocolMapFromPod(pod) + if err != nil { + return nil, err + } + + // Get Endpoints + var endpoints []string + for _, container := range pod.Spec.Containers { + for _, cp := range container.Ports { + port := cp.ContainerPort + protocol := protocolMap.GetProtocol(port) + if protocol == "" { + if cp.Name != "" { + protocol = strings.Split(cp.Name, "-")[0] + } else { + protocol = string(cp.Protocol) + } + } + addr := fmt.Sprintf("%s://%s:%d", protocol, podIP, port) + endpoints = append(endpoints, addr) + } + } + return ®istry.ServiceInstance{ + ID: podLabels[LabelsKeyServiceID], + Name: podLabels[LabelsKeyServiceName], + Version: podLabels[LabelsKeyServiceVersion], + Metadata: metadata, + Endpoints: endpoints, + }, nil +} + +// //////////// Error Definition //////////// + +// ErrIteratorClosed defines the error that the iterator is closed +var ErrIteratorClosed = errors.New("iterator closed") + +// ErrorHandleResource defines the error that cannot handle K8S resources normally +type ErrorHandleResource struct { + Namespace string + Name string + Reason error +} + +// Error implements the error interface +func (err *ErrorHandleResource) Error() string { + return fmt.Sprintf("failed to handle resource(namespace=%s, name=%s): %s", + err.Namespace, err.Name, err.Reason) +}