/*
      Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.

      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; version 2 of the License.

      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 */

/**
  @file storage/perfschema/table_replication_applier_status_by_cordinator.cc
  Table replication_applier_status_by_coordinator (implementation).
*/

#define HAVE_REPLICATION

#include "my_global.h"
#include "table_replication_applier_status_by_coordinator.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
#include "rpl_slave.h"
#include "rpl_info.h"
#include  "rpl_rli.h"
#include "rpl_mi.h"
#include "sql_parse.h"
#include "rpl_msr.h"       /* Multisource replication */

THR_LOCK table_replication_applier_status_by_coordinator::m_table_lock;

/*
  numbers in varchar count utf8 characters.
*/
static const TABLE_FIELD_TYPE field_types[]=
{

  {
    {C_STRING_WITH_LEN("CHANNEL_NAME")},
    {C_STRING_WITH_LEN("char(64)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("THREAD_ID")},
    {C_STRING_WITH_LEN("bigint")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("SERVICE_STATE")},
    {C_STRING_WITH_LEN("enum('ON','OFF')")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("LAST_ERROR_NUMBER")},
    {C_STRING_WITH_LEN("int(11)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("LAST_ERROR_MESSAGE")},
    {C_STRING_WITH_LEN("varchar(1024)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("LAST_ERROR_TIMESTAMP")},
    { C_STRING_WITH_LEN("timestamp") },
    { NULL, 0}
  },
};

TABLE_FIELD_DEF
table_replication_applier_status_by_coordinator::m_field_def=
{ 6, field_types };

PFS_engine_table_share
table_replication_applier_status_by_coordinator::m_share=
{
  { C_STRING_WITH_LEN("replication_applier_status_by_coordinator") },
  &pfs_readonly_acl,
  table_replication_applier_status_by_coordinator::create,
  NULL, /* write_row */
  NULL, /* delete_all_rows */
  table_replication_applier_status_by_coordinator::get_row_count,
  sizeof(PFS_simple_index), /* ref length */
  &m_table_lock,
  &m_field_def,
  false, /* checked */
  false  /* perpetual */
};

PFS_engine_table* table_replication_applier_status_by_coordinator::create(void)
{
  return new table_replication_applier_status_by_coordinator();
}

table_replication_applier_status_by_coordinator
  ::table_replication_applier_status_by_coordinator()
  : PFS_engine_table(&m_share, &m_pos),
    m_row_exists(false), m_pos(0), m_next_pos(0)
{}

table_replication_applier_status_by_coordinator
  ::~table_replication_applier_status_by_coordinator()
{}

void table_replication_applier_status_by_coordinator::reset_position(void)
{
  m_pos.m_index= 0;
  m_next_pos.m_index= 0;
}

ha_rows table_replication_applier_status_by_coordinator::get_row_count()
{
 return channel_map.get_max_channels();
}


int table_replication_applier_status_by_coordinator::rnd_next(void)
{
  Master_info *mi;
  int res= HA_ERR_END_OF_FILE;

  channel_map.rdlock();

  for(m_pos.set_at(&m_next_pos);
      m_pos.m_index < channel_map.get_max_channels() && res != 0;
      m_pos.next())
  {
    mi= channel_map.get_mi_at_pos(m_pos.m_index);

    /*
      Construct and display SQL Thread's (Coordinator) information in
      'replication_applier_status_by_coordinator' table only in the case of
      multi threaded slave mode. Code should do nothing in the case of single
      threaded slave mode. In case of single threaded slave mode SQL Thread's
      status will be reported as part of
      'replication_applier_status_by_worker' table.
    */
    if (mi && mi->host[0] && mi->rli && mi->rli->get_worker_count() > 0)
    {
      make_row(mi);
      m_next_pos.set_after(&m_pos);
      res= 0;
    }
  }

  channel_map.unlock();
  return res;
}

int table_replication_applier_status_by_coordinator::rnd_pos(const void *pos)
{
  Master_info *mi=NULL;
  int res= HA_ERR_RECORD_DELETED;

  set_position(pos);

  channel_map.rdlock();

  if ((mi= channel_map.get_mi_at_pos(m_pos.m_index)))
  {
    make_row(mi);
    res= 0;
  }

  channel_map.unlock();
  return res;
}

void table_replication_applier_status_by_coordinator::make_row(Master_info *mi)
{
  m_row_exists= false;

  DBUG_ASSERT(mi != NULL);
  DBUG_ASSERT(mi->rli != NULL);

  mysql_mutex_lock(&mi->rli->data_lock);

  m_row.channel_name_length= strlen(mi->get_channel());
  memcpy(m_row.channel_name, (char*)mi->get_channel(), m_row.channel_name_length);

  if (mi->rli->slave_running)
  {
    PSI_thread *psi= thd_get_psi(mi->rli->info_thd);
    PFS_thread *pfs= reinterpret_cast<PFS_thread *> (psi);
    if(pfs)
    {
      m_row.thread_id= pfs->m_thread_internal_id;
      m_row.thread_id_is_null= false;
    }
    else
      m_row.thread_id_is_null= true;
  }
  else
    m_row.thread_id_is_null= true;

  if (mi->rli->slave_running)
    m_row.service_state= PS_RPL_YES;
  else
    m_row.service_state= PS_RPL_NO;

  mysql_mutex_lock(&mi->rli->err_lock);

  m_row.last_error_number= (long int) mi->rli->last_error().number;
  m_row.last_error_message_length= 0;
  m_row.last_error_timestamp= 0;

  /** if error, set error message and timestamp */
  if (m_row.last_error_number)
  {
    char *temp_store= (char*) mi->rli->last_error().message;
    m_row.last_error_message_length= strlen(temp_store);
    memcpy(m_row.last_error_message, temp_store,
           m_row.last_error_message_length);

    /** time in millisecond since epoch */
    m_row.last_error_timestamp= (ulonglong)mi->rli->last_error().skr*1000000;
  }

  mysql_mutex_unlock(&mi->rli->err_lock);
  mysql_mutex_unlock(&mi->rli->data_lock);

  m_row_exists= true;
}

int table_replication_applier_status_by_coordinator
  ::read_row_values(TABLE *table, unsigned char *buf,
                    Field **fields, bool read_all)
{
  Field *f;

  if (unlikely(! m_row_exists))
    return HA_ERR_RECORD_DELETED;

  DBUG_ASSERT(table->s->null_bytes == 1);
  buf[0]= 0;

  for (; (f= *fields) ; fields++)
  {
    if (read_all || bitmap_is_set(table->read_set, f->field_index))
    {
      switch(f->field_index)
      {
      case 0: /* channel_name */
         set_field_char_utf8(f, m_row.channel_name, m_row.channel_name_length);
         break;
      case 1: /*thread_id*/
        if (!m_row.thread_id_is_null)
          set_field_ulonglong(f, m_row.thread_id);
        else
          f->set_null();
        break;
      case 2: /*service_state*/
        set_field_enum(f, m_row.service_state);
        break;
      case 3: /*last_error_number*/
        set_field_ulong(f, m_row.last_error_number);
        break;
      case 4: /*last_error_message*/
        set_field_varchar_utf8(f, m_row.last_error_message,
                               m_row.last_error_message_length);
        break;
      case 5: /*last_error_timestamp*/
        set_field_timestamp(f, m_row.last_error_timestamp);
        break;
      default:
        DBUG_ASSERT(false);
      }
    }
  }
  return 0;
}
