content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.server.response;
  
  import com.actiontech.dble.DbleServer;
  import com.actiontech.dble.backend.datasource.PhysicalDbInstance;
  import com.actiontech.dble.backend.mysql.PacketUtil;
  import com.actiontech.dble.config.ErrorCode;
  import com.actiontech.dble.config.Fields;
  import com.actiontech.dble.net.ConnectionException;
  import com.actiontech.dble.net.IOProcessor;
  import com.actiontech.dble.net.connection.BackendConnection;
  import com.actiontech.dble.net.connection.FrontendConnection;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.route.RouteResultsetNode;
  import com.actiontech.dble.services.manager.handler.ShowProcesslistHandler;
  import com.actiontech.dble.services.mysqlsharding.ShardingService;
  import com.actiontech.dble.services.rwsplit.RWSplitService;
  import com.actiontech.dble.util.CollectionUtil;
  import com.actiontech.dble.util.LongUtil;
  import com.actiontech.dble.util.StringUtil;
  
  import java.nio.ByteBuffer;
  import java.util.*;
  
  /**
   * ShowProcessList
   *
   * @author collapsar
   */
  public final class ShowDbleProcessList {
      private ShowDbleProcessList() {
      }
  
      private static final int FIELD_COUNT = 10;
      private static final ResultSetHeaderPacket HEADER = PacketUtil.getHeader(FIELD_COUNT);
      private static final FieldPacket[] FIELDS = new FieldPacket[FIELD_COUNT];
      private static final EOFPacket EOF = new EOFPacket();
      private static final String NULL_VAL = "NULL";
  
      static {
          int i = 0;
          byte packetId = 0;
          HEADER.setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("Front_Id", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("db_instance", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("MysqlId", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("User", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("Front_Host", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("db", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("Command", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("Time", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("State", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("Info", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i].setPacketId(++packetId);
  
          EOF.setPacketId(++packetId);
      }
  
      public static void response(ShardingService service) {
          List<RowDataPacket> rows = new ArrayList<>();
          Map<String, Integer> indexs = new HashMap<>();
          Map<PhysicalDbInstance, List<Long>> dbInstanceMap = new HashMap<>(8);
          String charset = service.getCharset().getResults();
  
          for (IOProcessor p : DbleServer.getInstance().getFrontProcessors()) {
              for (FrontendConnection fc : p.getFrontends().values()) {
                  if (fc == null || !fc.isAuthorized() || fc.isManager()) {
                      continue;
                  }
                  /*
                   only show your own task
                   */
                  if (!Objects.equals(fc.getFrontEndService().getUser(), service.getUser())) {
                      continue;
                  }
  
                  if (fc.getService() instanceof ShardingService) {
                      Map<RouteResultsetNode, BackendConnection> backendConns = ((ShardingService) fc.getService()).getSession2().getTargetMap();
                      if (!CollectionUtil.isEmpty(backendConns)) {
                          for (Map.Entry<RouteResultsetNode, BackendConnection> entry : backendConns.entrySet()) {
                              addRow(fc, entry.getValue(), charset, rows, indexs, dbInstanceMap);
                          }
                      } else {
                          rows.add(getRow(fc, null, null, charset));
                      }
                  } else {
                      BackendConnection conn = ((RWSplitService) fc.getService()).getSession2().getConn();
                      if (conn != null) {
                          addRow(fc, conn, charset, rows, indexs, dbInstanceMap);
                      } else {
                          rows.add(getRow(fc, null, null, charset));
                      }
                  }
              }
          }
  
          // set 'show processlist' content
          try {
              Map<String, Map<String, String>> backendRes = showProcessList(dbInstanceMap);
              for (Map.Entry<String, Integer> entry : indexs.entrySet()) {
                  Map<String, String> res = backendRes.get(entry.getKey());
                  if (res != null) {
                      int index = entry.getValue();
                      RowDataPacket row = rows.get(index);
                      row.setValue(5, StringUtil.encode(res.get("db"), charset));
                      row.setValue(6, StringUtil.encode(res.get("Command"), charset));
                      row.setValue(7, StringUtil.encode(res.get("Time"), charset));
                      row.setValue(8, StringUtil.encode(res.get("State"), charset));
                      row.setValue(9, StringUtil.encode(res.get("info"), charset));
                  }
              }
          } catch (ConnectionException ce) {
              service.writeErrMessage(ErrorCode.ER_BACKEND_CONNECTION, "backend connection acquisition exception!");
              return;
          }
  
          ByteBuffer buffer = service.allocate();
  
          // write header
          buffer = HEADER.write(buffer, service, true);
  
          // write fields
          for (FieldPacket field : FIELDS) {
              buffer = field.write(buffer, service, true);
          }
  
          // write eof
          buffer = EOF.write(buffer, service, true);
  
          // write rows
          byte packetId = EOF.getPacketId();
          for (RowDataPacket row : rows) {
              row.setPacketId(++packetId);
              buffer = row.write(buffer, service, true);
          }
  
          // write last eof
          EOFRowPacket lastEof = new EOFRowPacket();
          lastEof.setPacketId(++packetId);
  
  
          lastEof.write(buffer, service);
      }
  
      private static void addRow(FrontendConnection fconn, BackendConnection bconn, String charset, List<RowDataPacket> rows,
                                 Map<String, Integer> indexs, Map<PhysicalDbInstance, List<Long>> dbInstanceMap) {
          long threadId = bconn.getThreadId();
          PhysicalDbInstance dbInstance = (PhysicalDbInstance) bconn.getInstance();
          rows.add(getRow(fconn, dbInstance.getName(), threadId, charset));
          // index
          indexs.put(dbInstance.getName() + "." + threadId, rows.size() - 1);
          // dbInstance map
          if (dbInstanceMap.get(dbInstance) == null) {
              List<Long> threadIds = new ArrayList<>(10);
              threadIds.add(threadId);
              dbInstanceMap.put(dbInstance, threadIds);
          } else {
              dbInstanceMap.get(dbInstance).add(threadId);
          }
      }
  
      private static RowDataPacket getRow(FrontendConnection fc, String dbInstance, Long threadId, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          // Front_Id
          row.add(LongUtil.toBytes(fc.getId()));
          // dbInstance
          row.add(StringUtil.encode(dbInstance == null ? NULL_VAL : dbInstance, charset));
          // BconnID
          row.add(threadId == null ? StringUtil.encode(NULL_VAL, charset) : LongUtil.toBytes(threadId));
          // User
          row.add(StringUtil.encode(fc.getFrontEndService().getUser().getFullName(), charset));
          // Front_Host
          row.add(StringUtil.encode(fc.getHost() + ":" + fc.getLocalPort(), charset));
          // db
          row.add(StringUtil.encode(NULL_VAL, charset));
          // Command
          row.add(StringUtil.encode(NULL_VAL, charset));
          // Time
          row.add(StringUtil.encode("0", charset));
          // State
          row.add(StringUtil.encode("", charset));
          // Info
          row.add(StringUtil.encode(NULL_VAL, charset));
          return row;
      }
  
      private static Map<String, Map<String, String>> showProcessList(Map<PhysicalDbInstance, List<Long>> dns) {
          Map<String, Map<String, String>> result = new HashMap<>();
          for (Map.Entry<PhysicalDbInstance, List<Long>> entry : dns.entrySet()) {
              ShowProcesslistHandler handler = new ShowProcesslistHandler(entry.getKey(), entry.getValue());
              handler.execute();
              if (handler.isSuccess()) {
                  result.putAll(handler.getResult());
              } else {
                  throw new ConnectionException(ErrorCode.ER_BACKEND_CONNECTION, "backend connection acquisition exception!");
              }
          }
          return result;
      }
  
  }
  