/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed 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 com.alibaba.nacos.config.server.remote;

import com.alibaba.nacos.api.common.Constants;
import com.alibaba.nacos.api.config.remote.request.ConfigBatchListenRequest;
import com.alibaba.nacos.api.config.remote.response.ConfigChangeBatchListenResponse;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.remote.request.RequestMeta;
import com.alibaba.nacos.auth.annotation.Secured;
import com.alibaba.nacos.common.utils.NamespaceUtil;
import com.alibaba.nacos.config.server.service.ConfigCacheService;
import com.alibaba.nacos.config.server.utils.GroupKey2;
import com.alibaba.nacos.config.server.utils.ParamUtils;
import com.alibaba.nacos.core.control.TpsControl;
import com.alibaba.nacos.core.namespace.filter.NamespaceValidation;
import com.alibaba.nacos.core.paramcheck.ExtractorManager;
import com.alibaba.nacos.core.paramcheck.impl.ConfigBatchListenRequestParamExtractor;
import com.alibaba.nacos.core.remote.RequestHandler;
import com.alibaba.nacos.core.utils.StringPool;
import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
import com.alibaba.nacos.plugin.auth.constant.SignType;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * config change listen request handler.
 *
 * @author liuzunfei
 * @version $Id: ConfigChangeListenRequestHandler.java, v 0.1 2020年07月14日 10:11 AM liuzunfei Exp $
 */
@Component
public class ConfigChangeBatchListenRequestHandler
        extends RequestHandler<ConfigBatchListenRequest, ConfigChangeBatchListenResponse> {
    
    @Autowired
    private ConfigChangeListenContext configChangeListenContext;
    
    @Override
    @NamespaceValidation
    @TpsControl(pointName = "ConfigListen")
    @Secured(action = ActionTypes.READ, signType = SignType.CONFIG)
    @ExtractorManager.Extractor(rpcExtractor = ConfigBatchListenRequestParamExtractor.class)
    public ConfigChangeBatchListenResponse handle(ConfigBatchListenRequest configChangeListenRequest, RequestMeta meta)
            throws NacosException {
        String connectionId = StringPool.get(meta.getConnectionId());
        String tag = configChangeListenRequest.getHeader(Constants.VIPSERVER_TAG);
        ParamUtils.checkParam(tag);
        ConfigChangeBatchListenResponse configChangeBatchListenResponse = new ConfigChangeBatchListenResponse();
        for (ConfigBatchListenRequest.ConfigListenContext listenContext : configChangeListenRequest.getConfigListenContexts()) {
            boolean isNeedTransferNamespace = NamespaceUtil.isNeedTransferNamespace(listenContext.getTenant());
            String namespaceId = NamespaceUtil.processNamespaceParameter(listenContext.getTenant());
            String groupKey = GroupKey2.getKey(listenContext.getDataId(), listenContext.getGroup(), namespaceId);
            groupKey = StringPool.get(groupKey);
            
            String md5 = StringPool.get(listenContext.getMd5());
            
            if (configChangeListenRequest.isListen()) {
                configChangeListenContext.addListen(groupKey, md5, connectionId, isNeedTransferNamespace);
                boolean isUptoDate = ConfigCacheService.isUptodate(groupKey, md5, meta.getClientIp(), tag,
                        meta.getAppLabels());
                if (!isUptoDate) {
                    configChangeBatchListenResponse.addChangeConfig(listenContext.getDataId(), listenContext.getGroup(),
                            listenContext.getTenant());
                }
            } else {
                configChangeListenContext.removeListen(groupKey, connectionId);
            }
        }
        
        return configChangeBatchListenResponse;
        
    }
    
}
