replication_schema.cc

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Copyright (C) 2011 David Shrewsbury
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <config.h>
#include <plugin/slave/replication_schema.h>
#include <drizzled/execute.h>
#include <drizzled/sql/result_set.h>
#include <string>
#include <vector>
#include <boost/lexical_cast.hpp>

using namespace std;
using namespace drizzled;
using namespace boost;

namespace slave
{

bool ReplicationSchema::create()
{
  vector<string> sql;

  sql.push_back("COMMIT");
  sql.push_back("CREATE SCHEMA IF NOT EXISTS `sys_replication` REPLICATE=FALSE");

  if (not executeSQL(sql))
    return false;

  /*
    Create our IO thread state information table if we need to.
   */

  /*
    Table: io_state
    Version 1.0: Initial definition
    Version 1.1: Added master_id and PK on master_id
  */


  sql.clear();
  sql.push_back("COMMIT");
  sql.push_back("CREATE TABLE IF NOT EXISTS `sys_replication`.`io_state` ("
                " `master_id` BIGINT NOT NULL,"
                " `status` VARCHAR(20) NOT NULL,"
                " `error_msg` VARCHAR(250))"
                " COMMENT = 'VERSION 1.1'");

  if (not executeSQL(sql))
    return false;

  /*
   * Create our applier thread state information table if we need to.
   */

  /*
   * Table: applier_state
   * Version 1.0: Initial definition
   * Version 1.1: Added originating_server_uuid and originating_commit_id
   * Version 1.2: Added master_id and changed PK to master_id
   */

  sql.clear();
  sql.push_back("COMMIT");
  sql.push_back("CREATE TABLE IF NOT EXISTS `sys_replication`.`applier_state`"
                " (`master_id` BIGINT NOT NULL,"      
                " `last_applied_commit_id` BIGINT NOT NULL,"
                " `originating_server_uuid` VARCHAR(36) NOT NULL,"
                " `originating_commit_id` BIGINT NOT NULL,"
                " `status` VARCHAR(20) NOT NULL,"
                " `error_msg` VARCHAR(250))"
                " COMMENT = 'VERSION 1.2'");

  if (not executeSQL(sql))
    return false;

  /*
   * Create our message queue table if we need to.
   * Version 1.0: Initial definition
   * Version 1.1: Added originating_server_uuid and originating_commit_id
   * Version 1.2: Added master_id and changed PK to (master_id, trx_id, seg_id)
   */

  sql.clear();
  sql.push_back("COMMIT");
  sql.push_back("CREATE TABLE IF NOT EXISTS `sys_replication`.`queue`"
                " (`trx_id` BIGINT NOT NULL, `seg_id` INT NOT NULL,"
                " `commit_order` BIGINT,"
                " `originating_server_uuid` VARCHAR(36) NOT NULL,"
                " `originating_commit_id` BIGINT NOT NULL,"
                " `msg` BLOB,"
                " `master_id` BIGINT NOT NULL,"
                " PRIMARY KEY(`master_id`, `trx_id`, `seg_id`))"
                " COMMENT = 'VERSION 1.2'");
  if (not executeSQL(sql))
    return false;

  return true;
}

bool ReplicationSchema::createInitialIORow(uint32_t master_id)
{
  vector<string> sql;

  sql.push_back("SELECT COUNT(*) FROM `sys_replication`.`io_state` WHERE `master_id` = " + boost::lexical_cast<string>(master_id));

  sql::ResultSet result_set(1);
  Execute execute(*(_session.get()), true);
  execute.run(sql[0], result_set);
  result_set.next();
  string count= result_set.getString(0);

  if (count == "0")
  {
    sql.clear();
    sql.push_back("INSERT INTO `sys_replication`.`io_state` (`master_id`, `status`) VALUES ("
                  + boost::lexical_cast<string>(master_id)
                  + ", 'STOPPED')");
    if (not executeSQL(sql))
      return false;
  }

  return true;
}

bool ReplicationSchema::createInitialApplierRow(uint32_t master_id)
{
  vector<string> sql;

  sql.push_back("SELECT COUNT(*) FROM `sys_replication`.`applier_state` WHERE `master_id` = " + boost::lexical_cast<string>(master_id));

  sql::ResultSet result_set(1);
  Execute execute(*(_session.get()), true);
  execute.run(sql[0], result_set);
  result_set.next();
  string count= result_set.getString(0);

  if (count == "0")
  {
    sql.clear();
    sql.push_back("INSERT INTO `sys_replication`.`applier_state`"
                  " (`master_id`, `last_applied_commit_id`,"
                  " `originating_server_uuid`, `originating_commit_id`," 
                  " `status`) VALUES ("
                  + boost::lexical_cast<string>(master_id)
                  + ",0,"
                  + "'" + _session.get()->getServerUUID() + "'"
                  + ",0,'STOPPED')");
     
    if (not executeSQL(sql))
      return false;
  }

  return true;
}


bool ReplicationSchema::setInitialMaxCommitId(uint32_t master_id, uint64_t value)
{
  vector<string> sql;

  sql.push_back("UPDATE `sys_replication`.`applier_state`"
                " SET `last_applied_commit_id` = "
                + lexical_cast<string>(value)
                + " WHERE `master_id` = "
                + lexical_cast<string>(master_id));

  return executeSQL(sql);
}

} /* namespace slave */