/*
      Copyright (c) 2013, 2018, 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, version 2.0,
      as published by the Free Software Foundation.

      This program is also distributed with certain software (including
      but not limited to OpenSSL) that is licensed under separate terms,
      as designated in a particular file or component or in included license
      documentation.  The authors of MySQL hereby grant you an additional
      permission to link the program and your derivative works with the
      separately licensed software that they have included with MySQL.

      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, version 2.0, 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_connection_status.cc
  Table replication_connection_status (implementation).
*/

//#define HAVE_REPLICATION

#include "my_global.h"
#include "table_replication_connection_status.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
#include "slave.h"
//#include "rpl_info.h"
#include "rpl_rli.h"
#include "rpl_mi.h"
#include "sql_parse.h"
//#include "rpl_msr.h"           /* Multi source replication */
#include "log.h"
//#include "rpl_group_replication.h"

/*
  Callbacks implementation for GROUP_REPLICATION_CONNECTION_STATUS_CALLBACKS.
*/
static void set_channel_name(void* const context, const char& value,
                             size_t length)
{
}

static void set_group_name(void* const context, const char& value,
                           size_t length)
{
  struct st_row_connect_status* row=
      static_cast<struct st_row_connect_status*>(context);
  const size_t max= UUID_LENGTH;
  length= std::min(length, max);

  row->group_name_is_null= false;
  memcpy(row->group_name, &value, length);
}

static void set_source_uuid(void* const context, const char& value,
                            size_t length)
{
  struct st_row_connect_status* row=
      static_cast<struct st_row_connect_status*>(context);
  const size_t max= UUID_LENGTH;
  length= std::min(length, max);

  row->source_uuid_is_null= false;
  memcpy(row->source_uuid, &value, length);
}

static void set_service_state(void* const context, bool value)
{
  struct st_row_connect_status* row=
      static_cast<struct st_row_connect_status*>(context);

  row->service_state= value ? PS_RPL_CONNECT_SERVICE_STATE_YES
                            : PS_RPL_CONNECT_SERVICE_STATE_NO;
}


THR_LOCK table_replication_connection_status::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("GROUP_NAME")},
    {C_STRING_WITH_LEN("char(36)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("SOURCE_UUID")},
    {C_STRING_WITH_LEN("char(36)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("THREAD_ID")},
    {C_STRING_WITH_LEN("bigint(20)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("SERVICE_STATE")},
    {C_STRING_WITH_LEN("enum('ON','OFF','CONNECTING')")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("COUNT_RECEIVED_HEARTBEATS")},
    {C_STRING_WITH_LEN("bigint(20)")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("LAST_HEARTBEAT_TIMESTAMP")},
    {C_STRING_WITH_LEN("timestamp")},
    {NULL, 0}
  },
  {
    {C_STRING_WITH_LEN("RECEIVED_TRANSACTION_SET")},
    {C_STRING_WITH_LEN("longtext")},
    {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_connection_status::m_field_def= { 11, field_types };

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

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

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

table_replication_connection_status::~table_replication_connection_status()
{
}

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

ha_rows table_replication_connection_status::get_row_count()
{
  /*A lock is not needed for an estimate */
  return channel_map.get_max_channels();
}



int table_replication_connection_status::rnd_next(void)
{
  Master_info *mi= NULL;
  channel_map.rdlock();

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

    if (mi && mi->host[0])
    {
      make_row(mi);
      m_next_pos.set_after(&m_pos);
      channel_map.unlock();
      return 0;
    }
  }

  channel_map.unlock();
  return HA_ERR_END_OF_FILE;
}

int table_replication_connection_status::rnd_pos(const void *pos)
{
  Master_info *mi;
  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_connection_status::make_row(Master_info *mi)
{
  DBUG_ENTER("table_replication_connection_status::make_row");
  m_row_exists= false;
  bool error= false;

  /* Default values */
  m_row.group_name_is_null= true;
  m_row.source_uuid_is_null= true;
  m_row.thread_id_is_null= true;
  m_row.service_state= PS_RPL_CONNECT_SERVICE_STATE_NO;

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

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

  m_row.channel_name_length= mi->get_channel() ? strlen(mi->get_channel()):0;
  memcpy(m_row.channel_name, mi->get_channel(), m_row.channel_name_length);

  if (is_group_replication_plugin_loaded() &&
      channel_map.is_group_replication_channel_name(mi->get_channel(), true))
  {
    /*
      Group Replication applier channel.
      Set callbacks on GROUP_REPLICATION_GROUP_MEMBER_STATS_CALLBACKS.
    */
    const GROUP_REPLICATION_CONNECTION_STATUS_CALLBACKS callbacks=
    {
      &m_row,
      &set_channel_name,
      &set_group_name,
      &set_source_uuid,
      &set_service_state,
    };

    // Query plugin and let callbacks do their job.
    if (get_group_replication_connection_status_info(callbacks))
    {
      DBUG_PRINT("info", ("Group Replication stats not available!"));
    }
  }
  else
  {
    /* Slave channel. */
    if (mi->master_uuid[0] != 0)
    {
      memcpy(m_row.source_uuid, mi->master_uuid, UUID_LENGTH);
      m_row.source_uuid_is_null= false;
    }

    if (mi->slave_running == MYSQL_SLAVE_RUN_CONNECT)
      m_row.service_state= PS_RPL_CONNECT_SERVICE_STATE_YES;
    else
    {
      if (mi->slave_running == MYSQL_SLAVE_RUN_NOT_CONNECT)
        m_row.service_state= PS_RPL_CONNECT_SERVICE_STATE_CONNECTING;
      else
        m_row.service_state= PS_RPL_CONNECT_SERVICE_STATE_NO;
    }
  }

  if (mi->slave_running == MYSQL_SLAVE_RUN_CONNECT)
  {
    PSI_thread *psi= thd_get_psi(mi->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;
    }
  }

  m_row.count_received_heartbeats= mi->received_heartbeats;
  /*
    Time in Milliseconds since epoch. active_mi->last_heartbeat contains
    number of seconds so we multiply by 1000000.
  */
  m_row.last_heartbeat_timestamp= (ulonglong)mi->last_heartbeat*1000000;

  {
    global_sid_lock->wrlock();
    const Gtid_set* io_gtid_set= mi->rli->get_gtid_set();

    if ((m_row.received_transaction_set_length=
         io_gtid_set->to_string(&m_row.received_transaction_set)) < 0)
    {
      my_free(m_row.received_transaction_set);
      m_row.received_transaction_set_length= 0;
      global_sid_lock->unlock();
      error= true;
      goto end;
    }
    global_sid_lock->unlock();
  }

  /* Errors */
  mysql_mutex_lock(&mi->err_lock);
  mysql_mutex_lock(&mi->rli->err_lock);
  m_row.last_error_number= (unsigned int) mi->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->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. active_mi->last_error().skr contains
      number of seconds so we multiply by 1000000. */
    m_row.last_error_timestamp= (ulonglong)mi->last_error().skr*1000000;
  }
  mysql_mutex_unlock(&mi->rli->err_lock);
  mysql_mutex_unlock(&mi->err_lock);

end:
  mysql_mutex_unlock(&mi->rli->data_lock);
  mysql_mutex_unlock(&mi->data_lock);

  if (!error)
    m_row_exists= true;
  DBUG_VOID_RETURN;
}

int table_replication_connection_status::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: /** group_name */
        if (m_row.group_name_is_null)
          f->set_null();
        else
          set_field_char_utf8(f, m_row.group_name, UUID_LENGTH);
        break;
      case 2: /** source_uuid */
        if (m_row.source_uuid_is_null)
          f->set_null();
        else
          set_field_char_utf8(f, m_row.source_uuid, UUID_LENGTH);
        break;
      case 3: /** thread_id */
        if(m_row.thread_id_is_null)
          f->set_null();
        else
          set_field_ulonglong(f, m_row.thread_id);
        break;
      case 4: /** service_state */
        set_field_enum(f, m_row.service_state);
        break;
      case 5: /** number of heartbeat events received **/
        set_field_ulonglong(f, m_row.count_received_heartbeats);
        break;
      case 6: /** time of receipt of last heartbeat event **/
        set_field_timestamp(f, m_row.last_heartbeat_timestamp);
        break;
      case 7: /** received_transaction_set */
        set_field_longtext_utf8(f, m_row.received_transaction_set,
                                m_row.received_transaction_set_length);
        break;
      case 8: /*last_error_number*/
        set_field_ulong(f, m_row.last_error_number);
        break;
      case 9: /*last_error_message*/
        set_field_varchar_utf8(f, m_row.last_error_message,
                               m_row.last_error_message_length);
        break;
      case 10: /*last_error_timestamp*/
        set_field_timestamp(f, m_row.last_error_timestamp);
        break;
      default:
        DBUG_ASSERT(false);
      }
    }
  }
  m_row.cleanup();

  return 0;
}