lilai23 commented on a change in pull request #801:
URL: 
https://github.com/apache/servicecomb-service-center/pull/801#discussion_r549953565



##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/apache/servicecomb-service-center/pkg/dump"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "github.com/apache/servicecomb-service-center/pkg/util"
+       "github.com/apache/servicecomb-service-center/server/syncernotify"
+       "github.com/go-chassis/cari/discovery"
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+const (
+       SPLIT           = "/"
+       ServiceRootKey  = "/cse-sr/ms/files"
+       InstanceRootKey = "/cse-sr/inst/files"
+)

Review comment:
       建议引用datasource包下的常量

##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/apache/servicecomb-service-center/pkg/dump"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "github.com/apache/servicecomb-service-center/pkg/util"
+       "github.com/apache/servicecomb-service-center/server/syncernotify"
+       "github.com/go-chassis/cari/discovery"
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+const (
+       SPLIT           = "/"
+       ServiceRootKey  = "/cse-sr/ms/files"
+       InstanceRootKey = "/cse-sr/inst/files"
+)
+
+// InstanceEventHandler is the handler to handle events
+//as instance registry or instance delete, and notify syncer
+type InstanceEventHandler struct {
+}
+
+func (h InstanceEventHandler) Type() string {
+       return mongo.CollectionInstance
+}
+
+func (h InstanceEventHandler) OnEvent(evt sd.MongoEvent) {
+       action := evt.Type
+       instance := evt.Value.(sd.Instance)
+       providerID := instance.InstanceInfo.ServiceId
+       providerInstanceID := instance.InstanceInfo.InstanceId
+
+       cacheService := sd.Store().Service().Cache().Get(providerID)
+       var ms *discovery.MicroService
+       if cacheService != nil {
+               ms = cacheService.(sd.Service).ServiceInfo
+       }
+       if ms == nil {
+               log.Info("get cached service failed, then get from data base")
+               service, errs := mongo.GetService(context.Background(), 
bson.M{"serviceinfo.serviceid": providerID})
+               if service == nil || errs != nil {
+                       log.Error("get service from database failed", errs)
+                       return
+               }
+               ms = service.ServiceInfo // service in the cache may not ready, 
query from db once
+               if ms == nil {
+                       log.Warn(fmt.Sprintf("caught [%s] instance[%s/%s] 
event, endpoints %v, get provider's file failed from db\n",
+                               action, providerID, providerInstanceID, 
instance.InstanceInfo.Endpoints))
+                       return
+               }
+       }
+       if !syncernotify.GetSyncerNotifyCenter().Closed() {
+               NotifySyncerInstanceEvent(evt, ms)
+       }
+}
+
+func NewInstanceEventHandler() *InstanceEventHandler {
+       return &InstanceEventHandler{}
+}
+
+func NotifySyncerInstanceEvent(evt sd.MongoEvent, ms *discovery.MicroService) {
+       instance := evt.Value.(sd.Instance).InstanceInfo
+       log.Info(fmt.Sprintf("instance in NotifySyncerInstanceEvent : %v", 
instance))

Review comment:
       不必打印出instance所有信息,关键信息即可,比如instanceId

##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/apache/servicecomb-service-center/pkg/dump"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "github.com/apache/servicecomb-service-center/pkg/util"
+       "github.com/apache/servicecomb-service-center/server/syncernotify"
+       "github.com/go-chassis/cari/discovery"
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+const (
+       SPLIT           = "/"
+       ServiceRootKey  = "/cse-sr/ms/files"
+       InstanceRootKey = "/cse-sr/inst/files"
+)
+
+// InstanceEventHandler is the handler to handle events
+//as instance registry or instance delete, and notify syncer
+type InstanceEventHandler struct {
+}
+
+func (h InstanceEventHandler) Type() string {
+       return mongo.CollectionInstance
+}
+
+func (h InstanceEventHandler) OnEvent(evt sd.MongoEvent) {
+       action := evt.Type
+       instance := evt.Value.(sd.Instance)
+       providerID := instance.InstanceInfo.ServiceId
+       providerInstanceID := instance.InstanceInfo.InstanceId
+
+       cacheService := sd.Store().Service().Cache().Get(providerID)
+       var ms *discovery.MicroService
+       if cacheService != nil {
+               ms = cacheService.(sd.Service).ServiceInfo
+       }
+       if ms == nil {
+               log.Info("get cached service failed, then get from data base")
+               service, errs := mongo.GetService(context.Background(), 
bson.M{"serviceinfo.serviceid": providerID})
+               if service == nil || errs != nil {
+                       log.Error("get service from database failed", errs)
+                       return
+               }
+               ms = service.ServiceInfo // service in the cache may not ready, 
query from db once
+               if ms == nil {
+                       log.Warn(fmt.Sprintf("caught [%s] instance[%s/%s] 
event, endpoints %v, get provider's file failed from db\n",
+                               action, providerID, providerInstanceID, 
instance.InstanceInfo.Endpoints))
+                       return
+               }
+       }
+       if !syncernotify.GetSyncerNotifyCenter().Closed() {
+               NotifySyncerInstanceEvent(evt, ms)
+       }
+}
+
+func NewInstanceEventHandler() *InstanceEventHandler {
+       return &InstanceEventHandler{}
+}
+
+func NotifySyncerInstanceEvent(evt sd.MongoEvent, ms *discovery.MicroService) {
+       instance := evt.Value.(sd.Instance).InstanceInfo
+       log.Info(fmt.Sprintf("instance in NotifySyncerInstanceEvent : %v", 
instance))
+       instanceKey := util.StringJoin([]string{InstanceRootKey, 
evt.Value.(sd.Instance).Domain,
+               evt.Value.(sd.Instance).Project, instance.ServiceId, 
instance.InstanceId}, SPLIT)
+
+       instanceKv := dump.KV{
+               Key:   instanceKey,
+               Value: instance,
+       }
+
+       dInstance := dump.Instance{
+               KV:    &instanceKv,
+               Value: instance,
+       }
+       serviceKey := util.StringJoin([]string{ServiceRootKey, 
evt.Value.(sd.Instance).Domain,
+               evt.Value.(sd.Instance).Project, instance.ServiceId}, SPLIT)
+       serviceKv := dump.KV{
+               Key:   serviceKey,
+               Value: ms,
+       }
+
+       dService := dump.Microservice{

Review comment:
       同上

##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"

Review comment:
       建议包导入顺序:标准库、系统库、第三方库、本项目的库,不同分组之间使用空行分割开

##########
File path: datasource/mongo/event/instance_event_handler_test.go
##########
@@ -0,0 +1,75 @@
+package event
+
+import (
+       "testing"
+
+       "github.com/apache/servicecomb-service-center/datasource/mongo/client"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/go-chassis/cari/discovery"
+       "github.com/go-chassis/go-chassis/v2/storage"
+       "github.com/stretchr/testify/assert"
+)
+
+func init() {
+       config := storage.Options{
+               URI: "mongodb://localhost:27017",
+       }
+       client.NewMongoClient(config)
+}
+
+func TestInstanceEventHandler_OnEvent(t *testing.T) {
+
+       t.Run("OnEvent test by request config", func(t *testing.T) {
+               h := InstanceEventHandler{}
+               h.OnEvent(mongoAssign())
+               assert.NotNil(t, discovery.MicroService{})
+       })
+       t.Run("OnEvent test by request config", func(t *testing.T) {
+               h := InstanceEventHandler{}
+               h.OnEvent(mongoAssign())
+               assert.Error(t, assert.AnError)
+       })
+}
+
+func TestNotifySyncerInstanceEvent(t *testing.T) {
+       t.Run("NotifySyncerInstanceEvent test", func(t *testing.T) {
+               evt := mongoAssign()
+               ms := getMicroService()
+               NotifySyncerInstanceEvent(evt, ms)
+               assert.Equal(t, false, t.Failed())
+       })
+}
+
+func mongoAssign() sd.MongoEvent {
+       sd.Store().Service().Cache()
+       endPoints := []string{"127.0.0.1:27017"}
+       instance := discovery.MicroServiceInstance{
+               InstanceId: "f73dceb440f711eba63ffa163e7cdcb8",
+               ServiceId:  "2a20507274fc71c925d138341517dce14b600744",
+               Endpoints:  endPoints,
+       }
+       mInstance := sd.Instance{}
+       mInstance.InstanceInfo = &instance
+       mInstance.Domain = "default"

Review comment:
       变量命名问题

##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/apache/servicecomb-service-center/pkg/dump"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "github.com/apache/servicecomb-service-center/pkg/util"
+       "github.com/apache/servicecomb-service-center/server/syncernotify"
+       "github.com/go-chassis/cari/discovery"
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+const (
+       SPLIT           = "/"
+       ServiceRootKey  = "/cse-sr/ms/files"
+       InstanceRootKey = "/cse-sr/inst/files"
+)
+
+// InstanceEventHandler is the handler to handle events
+//as instance registry or instance delete, and notify syncer
+type InstanceEventHandler struct {
+}
+
+func (h InstanceEventHandler) Type() string {
+       return mongo.CollectionInstance
+}
+
+func (h InstanceEventHandler) OnEvent(evt sd.MongoEvent) {
+       action := evt.Type
+       instance := evt.Value.(sd.Instance)
+       providerID := instance.InstanceInfo.ServiceId
+       providerInstanceID := instance.InstanceInfo.InstanceId
+
+       cacheService := sd.Store().Service().Cache().Get(providerID)
+       var ms *discovery.MicroService
+       if cacheService != nil {
+               ms = cacheService.(sd.Service).ServiceInfo
+       }
+       if ms == nil {
+               log.Info("get cached service failed, then get from data base")
+               service, errs := mongo.GetService(context.Background(), 
bson.M{"serviceinfo.serviceid": providerID})
+               if service == nil || errs != nil {
+                       log.Error("get service from database failed", errs)
+                       return
+               }
+               ms = service.ServiceInfo // service in the cache may not ready, 
query from db once
+               if ms == nil {
+                       log.Warn(fmt.Sprintf("caught [%s] instance[%s/%s] 
event, endpoints %v, get provider's file failed from db\n",
+                               action, providerID, providerInstanceID, 
instance.InstanceInfo.Endpoints))
+                       return
+               }
+       }
+       if !syncernotify.GetSyncerNotifyCenter().Closed() {
+               NotifySyncerInstanceEvent(evt, ms)
+       }
+}
+
+func NewInstanceEventHandler() *InstanceEventHandler {
+       return &InstanceEventHandler{}
+}
+
+func NotifySyncerInstanceEvent(evt sd.MongoEvent, ms *discovery.MicroService) {
+       instance := evt.Value.(sd.Instance).InstanceInfo
+       log.Info(fmt.Sprintf("instance in NotifySyncerInstanceEvent : %v", 
instance))
+       instanceKey := util.StringJoin([]string{InstanceRootKey, 
evt.Value.(sd.Instance).Domain,
+               evt.Value.(sd.Instance).Project, instance.ServiceId, 
instance.InstanceId}, SPLIT)
+
+       instanceKv := dump.KV{
+               Key:   instanceKey,
+               Value: instance,
+       }
+
+       dInstance := dump.Instance{

Review comment:
       dInstance变量命名不清晰明了

##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 event
+
+import (
+       "context"
+       "fmt"
+       "github.com/apache/servicecomb-service-center/datasource/mongo"
+       "github.com/apache/servicecomb-service-center/datasource/mongo/sd"
+       "github.com/apache/servicecomb-service-center/pkg/dump"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "github.com/apache/servicecomb-service-center/pkg/util"
+       "github.com/apache/servicecomb-service-center/server/syncernotify"
+       "github.com/go-chassis/cari/discovery"
+       "go.mongodb.org/mongo-driver/bson"
+)
+
+const (
+       SPLIT           = "/"
+       ServiceRootKey  = "/cse-sr/ms/files"
+       InstanceRootKey = "/cse-sr/inst/files"
+)
+
+// InstanceEventHandler is the handler to handle events
+//as instance registry or instance delete, and notify syncer
+type InstanceEventHandler struct {
+}
+
+func (h InstanceEventHandler) Type() string {
+       return mongo.CollectionInstance
+}
+
+func (h InstanceEventHandler) OnEvent(evt sd.MongoEvent) {
+       action := evt.Type
+       instance := evt.Value.(sd.Instance)
+       providerID := instance.InstanceInfo.ServiceId
+       providerInstanceID := instance.InstanceInfo.InstanceId
+
+       cacheService := sd.Store().Service().Cache().Get(providerID)
+       var ms *discovery.MicroService
+       if cacheService != nil {
+               ms = cacheService.(sd.Service).ServiceInfo
+       }
+       if ms == nil {
+               log.Info("get cached service failed, then get from data base")
+               service, errs := mongo.GetService(context.Background(), 
bson.M{"serviceinfo.serviceid": providerID})
+               if service == nil || errs != nil {
+                       log.Error("get service from database failed", errs)
+                       return
+               }
+               ms = service.ServiceInfo // service in the cache may not ready, 
query from db once
+               if ms == nil {
+                       log.Warn(fmt.Sprintf("caught [%s] instance[%s/%s] 
event, endpoints %v, get provider's file failed from db\n",
+                               action, providerID, providerInstanceID, 
instance.InstanceInfo.Endpoints))
+                       return
+               }
+       }
+       if !syncernotify.GetSyncerNotifyCenter().Closed() {
+               NotifySyncerInstanceEvent(evt, ms)
+       }
+}
+
+func NewInstanceEventHandler() *InstanceEventHandler {
+       return &InstanceEventHandler{}
+}
+
+func NotifySyncerInstanceEvent(evt sd.MongoEvent, ms *discovery.MicroService) {
+       instance := evt.Value.(sd.Instance).InstanceInfo
+       log.Info(fmt.Sprintf("instance in NotifySyncerInstanceEvent : %v", 
instance))
+       instanceKey := util.StringJoin([]string{InstanceRootKey, 
evt.Value.(sd.Instance).Domain,
+               evt.Value.(sd.Instance).Project, instance.ServiceId, 
instance.InstanceId}, SPLIT)
+
+       instanceKv := dump.KV{
+               Key:   instanceKey,
+               Value: instance,
+       }
+
+       dInstance := dump.Instance{
+               KV:    &instanceKv,
+               Value: instance,
+       }
+       serviceKey := util.StringJoin([]string{ServiceRootKey, 
evt.Value.(sd.Instance).Domain,
+               evt.Value.(sd.Instance).Project, instance.ServiceId}, SPLIT)
+       serviceKv := dump.KV{
+               Key:   serviceKey,
+               Value: ms,
+       }
+
+       dService := dump.Microservice{
+               KV:    &serviceKv,
+               Value: ms,
+       }
+
+       instEvent := &dump.WatchInstanceChangedEvent{
+               Action:   string(evt.Type),
+               Service:  &dService,
+               Instance: &dInstance,
+       }
+       syncernotify.GetSyncerNotifyCenter().AddEvent(instEvent)
+
+       log.Debug(fmt.Sprintf("success to add instance change event:%v to event 
queue", instEvent))

Review comment:
       同上,日志打印不需打印整个结构体




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