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.services.manager.response;
  
  import com.actiontech.dble.DbleServer;
  import com.actiontech.dble.backend.mysql.PacketUtil;
  import com.actiontech.dble.config.ErrorCode;
  import com.actiontech.dble.config.Fields;
  import com.actiontech.dble.net.IOProcessor;
  import com.actiontech.dble.net.connection.FrontendConnection;
  import com.actiontech.dble.net.mysql.*;
  import com.actiontech.dble.route.parser.util.DruidUtil;
  import com.actiontech.dble.services.FrontendService;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.services.mysqlsharding.ShardingService;
  import com.actiontech.dble.util.IntegerUtil;
  import com.actiontech.dble.util.LongUtil;
  import com.actiontech.dble.util.StringUtil;
  import com.actiontech.dble.util.TimeUtil;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLStatement;
  import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
  import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
  
  import java.nio.ByteBuffer;
  import java.sql.SQLSyntaxErrorException;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Show Active Connection
   *
   * @author mycat
   */
  public final class ShowConnection {
      private static final int FIELD_COUNT = 21;
      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();
  
      static {
          int i = 0;
          byte packetId = 0;
          HEADER.setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("PROCESSOR", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FRONT_ID", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("HOST", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("PORT", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("LOCAL_PORT", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("USER", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("SCHEMA", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("CHARACTER_SET_CLIENT", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("COLLATION_CONNECTION", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("CHARACTER_SET_RESULTS", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("NET_IN", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("NET_OUT", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("ALIVE_TIME(S)", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("RECV_BUFFER", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("SEND_QUEUE", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("RECV_QUEUE", Fields.FIELD_TYPE_LONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("TX_ISOLATION_LEVEL", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("AUTOCOMMIT", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("SYS_VARIABLES", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("USER_VARIABLES", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("XA_ID", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i].setPacketId(++packetId);
  
          EOF.setPacketId(++packetId);
      }
  
      private ShowConnection() {
      }
  
      public static void execute(ManagerService service, String whereCondition) {
          Map<String, String> whereInfo = new HashMap<>(8);
          if (!StringUtil.isEmpty(whereCondition)) {
              SQLStatement statement;
              try {
                  statement = DruidUtil.parseMultiSQL("select 1 " + whereCondition);
                  SQLExpr whereExpr = ((SQLSelectStatement) statement).getSelect().getQueryBlock().getWhere();
                  getWhereCondition(whereExpr, whereInfo);
              } catch (SQLSyntaxErrorException e) {
                  service.writeErrMessage(ErrorCode.ER_PARSE_ERROR, "The sql has error syntax.");
                  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();
          IOProcessor[] processors = null;
  
          if (!whereInfo.isEmpty() && whereInfo.get("processor") != null) {
              for (IOProcessor nioProcessor : DbleServer.getInstance().getFrontProcessors()) {
                  if (nioProcessor.getName().equals(whereInfo.get("processor"))) {
                      processors = new IOProcessor[1];
                      processors[0] = nioProcessor;
                      whereInfo.remove("processor");
                      break;
                  }
              }
          } else {
              processors = DbleServer.getInstance().getFrontProcessors();
          }
  
          if (processors == null) {
              EOFRowPacket lastEof = new EOFRowPacket();
              lastEof.setPacketId(++packetId);
  
              lastEof.write(buffer, service);
              return;
          }
  
          for (IOProcessor p : processors) {
              if (!whereInfo.isEmpty() && whereInfo.get("front_id") != null) {
                  FrontendConnection fc = p.getFrontends().get(Long.parseLong(whereInfo.get("front_id")));
                  if (fc == null) {
                      continue;
                  }
                  whereInfo.remove("front_id");
                  if (fc.isAuthorized() && (whereInfo.isEmpty() || checkConn(fc, whereInfo))) {
                      RowDataPacket row = getRow(fc, service.getCharset().getResults());
                      row.setPacketId(++packetId);
                      buffer = row.write(buffer, service, true);
                  }
                  break;
              }
  
              for (FrontendConnection fc : p.getFrontends().values()) {
                  if (fc != null && fc.isAuthorized() && (whereInfo.isEmpty() || checkConn(fc, whereInfo))) {
                      RowDataPacket row = getRow(fc, service.getCharset().getResults());
                      row.setPacketId(++packetId);
                      buffer = row.write(buffer, service, true);
                  }
              }
          }
  
          // write last eof
          EOFRowPacket lastEof = new EOFRowPacket();
          lastEof.setPacketId(++packetId);
          lastEof.write(buffer, service);
      }
  
      public static void getWhereCondition(SQLExpr whereExpr, Map<String, String> whereInfo) {
          if (whereExpr instanceof SQLBinaryOpExpr) {
              SQLBinaryOpExpr tmp = (SQLBinaryOpExpr) whereExpr;
              if (tmp.getLeft() instanceof SQLBinaryOpExpr) {
                  getWhereCondition(tmp.getLeft(), whereInfo);
                  getWhereCondition(tmp.getRight(), whereInfo);
              } else {
                  whereInfo.put(tmp.getLeft().toString().toLowerCase(), StringUtil.removeApostrophe(tmp.getRight().toString()));
              }
          }
      }
  
      private static boolean checkConn(FrontendConnection fc, Map<String, String> whereInfo) {
          boolean isMatch = true;
          if (whereInfo.get("host") != null) {
              isMatch = fc.getHost().equals(whereInfo.get("host"));
          }
          if (whereInfo.get("user") != null) {
              isMatch = isMatch && fc.getFrontEndService().getUser().getFullName().equals(whereInfo.get("user"));
          }
          return isMatch;
      }
  
      private static RowDataPacket getRow(FrontendConnection c, String charset) {
          RowDataPacket row = new RowDataPacket(FIELD_COUNT);
          final FrontendService service = c.getFrontEndService();
          row.add(c.getProcessor().getName().getBytes());
          row.add(LongUtil.toBytes(c.getId()));
          row.add(StringUtil.encode(c.getHost(), charset));
          row.add(IntegerUtil.toBytes(c.getPort()));
          row.add(IntegerUtil.toBytes(c.getLocalPort()));
          row.add(StringUtil.encode(service.getUser().getFullName(), charset));
          row.add(StringUtil.encode(service.getSchema(), charset));
          row.add(StringUtil.encode(service.getCharset().getClient(), charset));
          row.add(StringUtil.encode(service.getCharset().getCollation(), charset));
          row.add(StringUtil.encode(service.getCharset().getResults(), charset));
          row.add(LongUtil.toBytes(c.getNetInBytes()));
          row.add(LongUtil.toBytes(c.getNetOutBytes()));
          row.add(LongUtil.toBytes((TimeUtil.currentTimeMillis() - c.getStartupTime()) / 1000L));
          ByteBuffer bb = c.getBottomReadBuffer();
          row.add(IntegerUtil.toBytes(bb == null ? 0 : bb.capacity()));
          row.add(IntegerUtil.toBytes(c.getWriteQueue().size()));
          row.add(IntegerUtil.toBytes(service.getRecvTaskQueueSize()));
          String txLevel = "";
          String autocommit = "";
          if (!c.isManager()) {
              txLevel = service.getTxIsolation() + "";
              autocommit = service.isAutocommit() + "";
          }
          row.add(txLevel.getBytes());
          row.add(autocommit.getBytes());
          row.add(StringUtil.encode(service.getStringOfSysVariables(), charset));
          row.add(StringUtil.encode(service.getStringOfUsrVariables(), charset));
          if (service instanceof ShardingService) {
              String xaid = ((ShardingService) service).getSession2().getSessionXaID();
              row.add(StringUtil.encode(xaid == null ? "NULL" : xaid, charset));
          } else {
              row.add(StringUtil.encode("-", charset));
          }
          return row;
      }
  
  }
  