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.nacos.core.cluster;
  
  import com.alibaba.nacos.api.common.NodeState;
  import com.alibaba.nacos.common.utils.ExceptionUtil;
  import com.alibaba.nacos.common.utils.InternetAddressUtil;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.core.utils.Loggers;
  import com.alibaba.nacos.sys.env.EnvUtil;
  
  import java.time.LocalDateTime;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  import java.util.function.Predicate;
  import java.util.stream.Collectors;
  
  /**
   * Member node tool class.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public class MemberUtil {
      
      protected static final String TARGET_MEMBER_CONNECT_REFUSE_ERRMSG = "Connection refused";
      
      private static final String SERVER_PORT_PROPERTY = "nacos.server.main.port";
      
      private static final int DEFAULT_SERVER_PORT = 8848;
      
      private static final int DEFAULT_RAFT_OFFSET_PORT = 1000;
      
      private static final String MEMBER_FAIL_ACCESS_CNT_PROPERTY = "nacos.core.member.fail-access-cnt";
      
      private static final int DEFAULT_MEMBER_FAIL_ACCESS_CNT = 3;
      
      /**
       * Information copy.
       *
       * @param newMember {@link Member}
       * @param oldMember {@link Member}
       */
      public static void copy(Member newMember, Member oldMember) {
          oldMember.setIp(newMember.getIp());
          oldMember.setPort(newMember.getPort());
          oldMember.setState(newMember.getState());
          oldMember.setExtendInfo(newMember.getExtendInfo());
          oldMember.setAddress(newMember.getAddress());
          oldMember.setAbilities(newMember.getAbilities());
          oldMember.setGrpcReportEnabled(newMember.isGrpcReportEnabled());
      }
      
      /**
       * parse ip:port to member.
       *
       * @param member ip:port
       * @return {@link Member}
       */
      @SuppressWarnings("PMD.UndefineMagicConstantRule")
      public static Member singleParse(String member) {
          // Nacos default port is 8848
          int defaultPort = EnvUtil.getProperty(SERVER_PORT_PROPERTY, Integer.class, DEFAULT_SERVER_PORT);
          // Set the default Raft port information for securit
          
          String address = member;
          int port = defaultPort;
          String[] info = InternetAddressUtil.splitIpPortStr(address);
          if (info.length > 1) {
              address = info[0];
              port = Integer.parseInt(info[1]);
          }
          
          Member target = Member.builder().ip(address).port(port).state(NodeState.UP).build();
          Map<String, Object> extendInfo = new HashMap<>(4);
          // The Raft Port information needs to be set by default
          extendInfo.put(MemberMetaDataConstants.RAFT_PORT, String.valueOf(calculateRaftPort(target)));
          extendInfo.put(MemberMetaDataConstants.READY_TO_UPGRADE, true);
          target.setExtendInfo(extendInfo);
          // use grpc to report default
          target.setGrpcReportEnabled(true);
          return target;
      }
      
      /**
       * check whether the member support long connection or not.
       *
       * @param member member instance of server.
       * @return support long connection or not.
       */
      public static boolean isSupportedLongCon(Member member) {
          if (member.getAbilities() == null || member.getAbilities().getRemoteAbility() == null) {
              return false;
          }
          
          boolean oldVerJudge = member.getAbilities().getRemoteAbility().isSupportRemoteConnection();
          
          return member.isGrpcReportEnabled() || oldVerJudge;
      }
      
      public static int calculateRaftPort(Member member) {
          return member.getPort() - DEFAULT_RAFT_OFFSET_PORT;
      }
      
      /**
       * Resolves to Member list.
       *
       * @param addresses ip list, example [127.0.0.1:8847,127.0.0.1:8848,127.0.0.1:8849]
       * @return member list
       */
      public static Collection<Member> multiParse(Collection<String> addresses) {
          List<Member> members = new ArrayList<>(addresses.size());
          for (String address : addresses) {
              Member member = singleParse(address);
              members.add(member);
          }
          return members;
      }
      
      /**
       * Successful processing of the operation on the node.
       *
       * @param member {@link Member}
       */
      public static void onSuccess(final ServerMemberManager manager, final Member member) {
          final NodeState old = member.getState();
          manager.getMemberAddressInfos().add(member.getAddress());
          member.setState(NodeState.UP);
          member.setFailAccessCnt(0);
          if (!Objects.equals(old, member.getState())) {
              manager.notifyMemberChange(member);
          }
      }
      
      /**
       * Successful processing of the operation on the node and update metadata.
       *
       * @param member {@link Member}
       * @since 2.1.2
       */
      public static void onSuccess(final ServerMemberManager manager, final Member member, final Member receivedMember) {
          if (isMetadataChanged(member, receivedMember)) {
              manager.getMemberAddressInfos().add(member.getAddress());
              member.setState(NodeState.UP);
              member.setFailAccessCnt(0);
              member.setExtendInfo(receivedMember.getExtendInfo());
              member.setAbilities(receivedMember.getAbilities());
              manager.notifyMemberChange(member);
          } else {
              onSuccess(manager, member);
          }
      }
      
      private static boolean isMetadataChanged(Member expected, Member actual) {
          return !Objects.equals(expected.getAbilities(), actual.getAbilities()) || isBasicInfoChangedInExtendInfo(
                  expected, actual);
      }
      
      public static void onFail(final ServerMemberManager manager, final Member member) {
          // To avoid null pointer judgments, pass in one NONE_EXCEPTION
          onFail(manager, member, ExceptionUtil.NONE_EXCEPTION);
      }
      
      /**
       * Failure processing of the operation on the node.
       *
       * @param member {@link Member}
       * @param ex     {@link Throwable}
       */
      public static void onFail(final ServerMemberManager manager, final Member member, Throwable ex) {
          manager.getMemberAddressInfos().remove(member.getAddress());
          final NodeState old = member.getState();
          member.setState(NodeState.SUSPICIOUS);
          member.setFailAccessCnt(member.getFailAccessCnt() + 1);
          int maxFailAccessCnt = EnvUtil
                  .getProperty(MEMBER_FAIL_ACCESS_CNT_PROPERTY, Integer.class, DEFAULT_MEMBER_FAIL_ACCESS_CNT);
          
          // If the number of consecutive failures to access the target node reaches
          // a maximum, or the link request is rejected, the state is directly down
          if (member.getFailAccessCnt() > maxFailAccessCnt || StringUtils
                  .containsIgnoreCase(ex.getMessage(), TARGET_MEMBER_CONNECT_REFUSE_ERRMSG)) {
              member.setState(NodeState.DOWN);
          }
          if (!Objects.equals(old, member.getState())) {
              manager.notifyMemberChange(member);
          }
      }
      
      /**
       * Node list information persistence.
       *
       * @param members member list
       */
      public static void syncToFile(Collection<Member> members) {
          try {
              StringBuilder builder = new StringBuilder();
              builder.append('#').append(LocalDateTime.now()).append(StringUtils.LF);
              for (String member : simpleMembers(members)) {
                  builder.append(member).append(StringUtils.LF);
              }
              EnvUtil.writeClusterConf(builder.toString());
          } catch (Throwable ex) {
              Loggers.CLUSTER.error("cluster member node persistence failed : {}", ExceptionUtil.getAllExceptionMsg(ex));
          }
      }
      
      /**
       * Default configuration format resolution, only NACos-Server IP or IP :port or hostname: Port information.
       */
      public static Collection<Member> readServerConf(Collection<String> members) {
          Set<Member> nodes = new HashSet<>();
          
          for (String member : members) {
              Member target = singleParse(member);
              nodes.add(target);
          }
          
          return nodes;
      }
      
      /**
       * Select target members with filter.
       *
       * @param members original members
       * @param filter  filter
       * @return target members
       */
      public static Set<Member> selectTargetMembers(Collection<Member> members, Predicate<Member> filter) {
          return members.stream().filter(filter).collect(Collectors.toSet());
      }
      
      /**
       * Get address list of members.
       *
       * @param members members
       * @return address list
       */
      public static List<String> simpleMembers(Collection<Member> members) {
          return members.stream().map(Member::getAddress).sorted()
                  .collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
      }
      
      /**
       * Judge whether basic info has changed.
       *
       * @param actual   actual member
       * @param expected expected member
       * @return true if one content is different, otherwise false
       */
      public static boolean isBasicInfoChanged(Member actual, Member expected) {
          if (null == expected) {
              return null != actual;
          }
          if (!expected.getIp().equals(actual.getIp())) {
              return true;
          }
          if (expected.getPort() != actual.getPort()) {
              return true;
          }
          if (!expected.getAddress().equals(actual.getAddress())) {
              return true;
          }
          if (!expected.getState().equals(actual.getState())) {
              return true;
          }
      
          // if change
          if (expected.isGrpcReportEnabled() != actual.isGrpcReportEnabled()) {
              return true;
          }
          
          return isBasicInfoChangedInExtendInfo(expected, actual);
      }
      
      private static boolean isBasicInfoChangedInExtendInfo(Member expected, Member actual) {
          for (String each : MemberMetaDataConstants.BASIC_META_KEYS) {
              if (expected.getExtendInfo().containsKey(each) != actual.getExtendInfo().containsKey(each)) {
                  return true;
              }
              if (!Objects.equals(expected.getExtendVal(each), actual.getExtendVal(each))) {
                  return true;
              }
          }
          return false;
      }
  }
  