Add: kubernetes registry and remote package unit test

go.mod

@@ -57,6 +57,10 @@ require (
 	go.uber.org/zap v1.10.0
 	google.golang.org/grpc v1.22.1
 	gopkg.in/yaml.v2 v2.2.2
+	k8s.io/api v0.0.0-20190325185214-7544f9db76f6
+	k8s.io/apimachinery v0.0.0-20190223001710-c182ff3b9841
+	k8s.io/client-go v8.0.0+incompatible
+	k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a // indirect
 )
 
 go 1.13

registry/etcdv3/listener.go

@@ -38,9 +38,9 @@ type dataListener struct {
 	listener      config_center.ConfigurationListener
 }
 
-// NewRegistryDataListener ...
+// NewRegistryDataListener
 func NewRegistryDataListener(listener config_center.ConfigurationListener) *dataListener {
-	return &dataListener{listener: listener, interestedURL: []*common.URL{}}
+	return &dataListener{listener: listener}
 }
 
 func (l *dataListener) AddInterestedURL(url *common.URL) {
@@ -49,7 +49,12 @@ func (l *dataListener) AddInterestedURL(url *common.URL) {
 
 func (l *dataListener) DataChange(eventType remoting.Event) bool {
 
-	url := eventType.Path[strings.Index(eventType.Path, "/providers/")+len("/providers/"):]
+	index := strings.Index(eventType.Path, "/providers/")
+	if index == -1 {
+		logger.Warnf("Listen with no url, event.path={%v}", eventType.Path)
+		return false
+	}
+	url := eventType.Path[index+len("/providers/"):]
 	serviceURL, err := common.NewURL(url)
 	if err != nil {
 		logger.Warnf("Listen NewURL(r{%s}) = error{%v}", eventType.Path, err)
@@ -68,7 +73,6 @@ func (l *dataListener) DataChange(eventType remoting.Event) bool {
 			return true
 		}
 	}
-
 	return false
 }
 
@@ -97,7 +101,7 @@ func (l *configurationListener) Next() (*registry.ServiceEvent, error) {
 
 		case e := <-l.events:
 			logger.Infof("got etcd event %#v", e)
-			if e.ConfigType == remoting.EventTypeDel {
+			if e.ConfigType == remoting.EventTypeDel && l.registry.client.Valid() {
 				select {
 				case <-l.registry.Done():
 					logger.Warnf("update @result{%s}. But its connection to registry is invalid", e.Value)

registry/etcdv3/listener_test.go

@@ -18,10 +18,9 @@
 package etcdv3
 
 import (
+	"os/exec"
 	"testing"
 	"time"
-
-	"github.com/apache/dubbo-go/config_center"
 )
 
 import (
@@ -32,6 +31,7 @@ import (
 
 import (
 	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/config_center"
 	"github.com/apache/dubbo-go/remoting"
 )
 
@@ -40,13 +40,16 @@ type RegistryTestSuite struct {
 	etcd *embed.Etcd
 }
 
+const defaultEtcdV3WorkDir = "/tmp/default-dubbo-go-registry.etcd"
+
 // start etcd server
 func (suite *RegistryTestSuite) SetupSuite() {
 
 	t := suite.T()
 
 	cfg := embed.NewConfig()
-	cfg.Dir = "/tmp/default.etcd"
+	// avoid conflict with default etcd work-dir
+	cfg.Dir = defaultEtcdV3WorkDir
 	e, err := embed.StartEtcd(cfg)
 	if err != nil {
 		t.Fatal(err)
@@ -66,6 +69,10 @@ func (suite *RegistryTestSuite) SetupSuite() {
 // stop etcd server
 func (suite *RegistryTestSuite) TearDownSuite() {
 	suite.etcd.Close()
+	// clean the etcd workdir
+	if err := exec.Command("rm", "-rf", defaultEtcdV3WorkDir).Run(); err != nil {
+		suite.FailNow(err.Error())
+	}
 }
 
 func (suite *RegistryTestSuite) TestDataChange() {

registry/etcdv3/registry_test.go

@@ -98,7 +98,7 @@ func (suite *RegistryTestSuite) TestSubscribe() {
 	assert.Regexp(t, ".*ServiceEvent{Action{add}.*", serviceEvent.String())
 }
 
-func (suite *RegistryTestSuite) TestConsumerDestory() {
+func (suite *RegistryTestSuite) TestConsumerDestroy() {
 
 	t := suite.T()
 	url, _ := common.NewURL("dubbo://127.0.0.1:20000/com.ikurento.user.UserProvider", common.WithParamsValue(constant.CLUSTER_KEY, "mock"), common.WithMethods([]string{"GetUser", "AddUser"}))
@@ -117,7 +117,7 @@ func (suite *RegistryTestSuite) TestConsumerDestory() {
 
 }
 
-func (suite *RegistryTestSuite) TestProviderDestory() {
+func (suite *RegistryTestSuite) TestProviderDestroy() {
 
 	t := suite.T()
 	reg := initRegistry(t)

registry/kubernetes/listener.go

@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kubernetes
+
+import (
+	"strings"
+)
+
+import (
+	perrors "github.com/pkg/errors"
+)
+
+import (
+	"github.com/apache/dubbo-go/common"
+	"github.com/apache/dubbo-go/common/logger"
+	"github.com/apache/dubbo-go/config_center"
+	"github.com/apache/dubbo-go/registry"
+	"github.com/apache/dubbo-go/remoting"
+)
+
+type dataListener struct {
+	interestedURL []*common.URL
+	listener      config_center.ConfigurationListener
+}
+
+// NewRegistryDataListener
+func NewRegistryDataListener(listener config_center.ConfigurationListener) *dataListener {
+	return &dataListener{listener: listener}
+}
+
+// AddInterestedURL
+func (l *dataListener) AddInterestedURL(url *common.URL) {
+	l.interestedURL = append(l.interestedURL, url)
+}
+
+// DataChange
+// notify listen, when interest event
+func (l *dataListener) DataChange(eventType remoting.Event) bool {
+
+	index := strings.Index(eventType.Path, "/providers/")
+	if index == -1 {
+		logger.Warnf("Listen with no url, event.path={%v}", eventType.Path)
+		return false
+	}
+	url := eventType.Path[index+len("/providers/"):]
+	serviceURL, err := common.NewURL(url)
+	if err != nil {
+		logger.Warnf("Listen NewURL(r{%s}) = error{%v}", eventType.Path, err)
+		return false
+	}
+
+	for _, v := range l.interestedURL {
+		if serviceURL.URLEqual(*v) {
+			l.listener.Process(
+				&config_center.ConfigChangeEvent{
+					Key:        eventType.Path,
+					Value:      serviceURL,
+					ConfigType: eventType.Action,
+				},
+			)
+			return true
+		}
+	}
+	return false
+}
+
+type configurationListener struct {
+	registry *kubernetesRegistry
+	events   chan *config_center.ConfigChangeEvent
+}
+
+// NewConfigurationListener for listening the event of kubernetes.
+func NewConfigurationListener(reg *kubernetesRegistry) *configurationListener {
+	// add a new waiter
+	reg.WaitGroup().Add(1)
+	return &configurationListener{registry: reg, events: make(chan *config_center.ConfigChangeEvent, 32)}
+}
+
+func (l *configurationListener) Process(configType *config_center.ConfigChangeEvent) {
+	l.events <- configType
+}
+
+func (l *configurationListener) Next() (*registry.ServiceEvent, error) {
+	for {
+		select {
+		case <-l.registry.Done():
+			logger.Warnf("listener's kubernetes client connection is broken, so kubernetes event listener exits now.")
+			return nil, perrors.New("listener stopped")
+
+		case e := <-l.events:
+			logger.Infof("got kubernetes event %#v", e)
+			if e.ConfigType == remoting.EventTypeDel && !l.registry.client.Valid() {
+				select {
+				case <-l.registry.Done():
+					logger.Warnf("update @result{%s}. But its connection to registry is invalid", e.Value)
+				default:
+				}
+				continue
+			}
+			return &registry.ServiceEvent{Action: e.ConfigType, Service: e.Value.(common.URL)}, nil
+		}
+	}
+}
+func (l *configurationListener) Close() {
+	l.registry.WaitGroup().Done()
+}