content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * 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.Fields;
  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.net.service.AbstractService;
  import com.actiontech.dble.services.FrontendService;
  import com.actiontech.dble.services.manager.ManagerService;
  import com.actiontech.dble.services.mysqlsharding.MySQLResponseService;
  import com.actiontech.dble.services.mysqlsharding.ShardingService;
  import com.actiontech.dble.services.rwsplit.RWSplitService;
  import com.actiontech.dble.singleton.FlowController;
  import com.actiontech.dble.util.LongUtil;
  import com.actiontech.dble.util.StringUtil;
  
  import java.nio.ByteBuffer;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Created by szf on 2020/4/10.
   */
  public final class FlowControlList {
      private static final int FIELD_COUNT = 6;
      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("CONNECTION_TYPE", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("CONNECTION_ID", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("CONNECTION_INFO", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("WRITING_QUEUE_BYTES", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("READING_QUEUE_BYTES", Fields.FIELD_TYPE_LONGLONG);
          FIELDS[i++].setPacketId(++packetId);
  
          FIELDS[i] = PacketUtil.getField("FLOW_CONTROLLED", Fields.FIELD_TYPE_VAR_STRING);
          FIELDS[i].setPacketId(++packetId);
          EOF.setPacketId(++packetId);
      }
  
      private FlowControlList() {
  
      }
  
      public static void execute(ManagerService service) {
          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();
  
          if (FlowController.isEnableFlowControl()) {
              for (RowDataPacket row : getServerConnections(service)) {
                  row.setPacketId(++packetId);
                  buffer = row.write(buffer, service, true);
              }
              for (RowDataPacket row : getBackendConnections(service)) {
                  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 List<RowDataPacket> getBackendConnections(ManagerService service) {
          List<RowDataPacket> rows = new ArrayList<>();
          IOProcessor[] processors = DbleServer.getInstance().getBackendProcessors();
          for (IOProcessor p : processors) {
              for (BackendConnection bc : p.getBackends().values()) {
                  MySQLResponseService mc = bc.getBackendService();
                  if (mc == null) {
                      continue;
                  }
                  int writeSize = mc.getConnection().getWritingSize().get();
                  int readSize = mc.getReadSize();
                  RowDataPacket row = new RowDataPacket(FIELD_COUNT);
                  row.add(StringUtil.encode("MySQLConnection", service.getCharset().getResults()));
                  row.add(LongUtil.toBytes(mc.getConnection().getId()));
                  row.add(StringUtil.encode(mc.getConnection().getInstance().getConfig().getUrl() + "/" + mc.getSchema() + " mysqlId = " + mc.getConnection().getThreadId(), service.getCharset().getResults()));
                  row.add(LongUtil.toBytes(writeSize));
                  row.add(LongUtil.toBytes(readSize));
                  row.add(mc.isFlowControlled() ? "true".getBytes() : "false".getBytes());
                  rows.add(row);
              }
          }
          return rows;
      }
  
      private static List<RowDataPacket> getServerConnections(ManagerService service) {
          List<RowDataPacket> rows = new ArrayList<>();
          IOProcessor[] processors = DbleServer.getInstance().getFrontProcessors();
          for (IOProcessor p : processors) {
              for (FrontendConnection fc : p.getFrontends().values()) {
                  AbstractService fcService = fc.getService();
                  if (fcService instanceof ShardingService || fcService instanceof RWSplitService) {
                      int size = fc.getWritingSize().get();
                      RowDataPacket row = new RowDataPacket(FIELD_COUNT);
                      row.add(StringUtil.encode("ServerConnection", service.getCharset().getResults()));
                      row.add(LongUtil.toBytes(fc.getId()));
                      row.add(StringUtil.encode(fc.getHost() + ":" + fc.getLocalPort() + "/" + ((FrontendService) fcService).getSchema() + " user = " + ((FrontendService) fcService).getUser().getFullName(), service.getCharset().getResults()));
                      row.add(LongUtil.toBytes(size));
                      row.add(null); // not support
                      row.add(fc.isFrontWriteFlowControlled() ? "true".getBytes() : "false".getBytes());
                      rows.add(row);
                  }
              }
          }
          return rows;
      }
  
  }
  