content: /*
   * 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.csp.sentinel.dashboard.rule;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import com.alibaba.csp.sentinel.dashboard.client.SentinelApiClient;
  import com.alibaba.csp.sentinel.dashboard.discovery.AppManagement;
  import com.alibaba.csp.sentinel.dashboard.discovery.MachineInfo;
  import com.alibaba.csp.sentinel.util.StringUtil;
  
  import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.FlowRuleEntity;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Component;
  
  /**
   * @author Eric Zhao
   */
  @Component("flowRuleDefaultProvider")
  public class FlowRuleApiProvider implements DynamicRuleProvider<List<FlowRuleEntity>> {
  
      @Autowired
      private SentinelApiClient sentinelApiClient;
      @Autowired
      private AppManagement appManagement;
  
      @Override
      public List<FlowRuleEntity> getRules(String appName) throws Exception {
          if (StringUtil.isBlank(appName)) {
              return new ArrayList<>();
          }
          List<MachineInfo> list = appManagement.getDetailApp(appName).getMachines()
              .stream()
              .filter(MachineInfo::isHealthy)
              .sorted((e1, e2) -> Long.compare(e2.getLastHeartbeat(), e1.getLastHeartbeat())).collect(Collectors.toList());
          if (list.isEmpty()) {
              return new ArrayList<>();
          } else {
              MachineInfo machine = list.get(0);
              return sentinelApiClient.fetchFlowRuleOfMachine(machine.getApp(), machine.getIp(), machine.getPort());
          }
      }
  }
  