[GitHub] [servicecomb-service-center] yeyiwei commented on a change in pull request #803: sync data processer

[GitBox <gi...@apache.org>]

yeyiwei commented on a change in pull request #803:
URL: https://github.com/apache/servicecomb-service-center/pull/803#discussion_r550369598



##########
File path: datasource/mongo/event/instance_event_handler.go
##########
@@ -0,0 +1,113 @@
+/*
+ * 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"
+	"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"
+)
+
+// 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 {

Review comment:
       已改为两次判断




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