polardbxengine/storage/perfschema/table_accounts.cc

/* Copyright (c) 2011, 2019, 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.

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  as designated in a particular file or component or in included license
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  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_accounts.cc
  TABLE ACCOUNTS.
*/

#include "storage/perfschema/table_accounts.h"

#include <stddef.h>

#include "my_dbug.h"
#include "my_thread.h"
#include "sql/field.h"
#include "sql/plugin_table.h"
#include "sql/table.h"
#include "storage/perfschema/pfs_account.h"
#include "storage/perfschema/pfs_events_transactions.h"
#include "storage/perfschema/pfs_instr.h"
#include "storage/perfschema/pfs_instr_class.h"
#include "storage/perfschema/pfs_memory.h"
#include "storage/perfschema/pfs_status.h"
#include "storage/perfschema/pfs_visitor.h"

THR_LOCK table_accounts::m_table_lock;

Plugin_table table_accounts::m_table_def(
    /* Schema name */
    "performance_schema",
    /* Name */
    "accounts",
    /* Definition */
    "  USER CHAR(32) collate utf8mb4_bin default null,\n"
    "  HOST CHAR(255) CHARACTER SET ASCII default null,\n"
    "  CURRENT_CONNECTIONS bigint not null,\n"
    "  TOTAL_CONNECTIONS bigint not null,\n"
    "  UNIQUE KEY `ACCOUNT` (USER, HOST) USING HASH\n",
    /* Options */
    " ENGINE=PERFORMANCE_SCHEMA",
    /* Tablespace */
    nullptr);

PFS_engine_table_share table_accounts::m_share = {
    &pfs_truncatable_acl,
    table_accounts::create,
    NULL, /* write_row */
    table_accounts::delete_all_rows,
    cursor_by_account::get_row_count,
    sizeof(PFS_simple_index), /* ref length */
    &m_table_lock,
    &m_table_def,
    false /* perpetual */,
    PFS_engine_table_proxy(),
    {0},
    false /* m_in_purgatory */
};

bool PFS_index_accounts_by_user_host::match(PFS_account *pfs) {
  if (m_fields >= 1) {
    if (!m_key_1.match(pfs)) {
      return false;
    }
  }

  if (m_fields >= 2) {
    if (!m_key_2.match(pfs)) {
      return false;
    }
  }

  return true;
}

PFS_engine_table *table_accounts::create(PFS_engine_table_share *) {
  return new table_accounts();
}

int table_accounts::delete_all_rows(void) {
  reset_events_waits_by_thread();
  reset_events_waits_by_account();
  reset_events_stages_by_thread();
  reset_events_stages_by_account();
  reset_events_statements_by_thread();
  reset_events_statements_by_account();
  reset_events_transactions_by_thread();
  reset_events_transactions_by_account();
  reset_memory_by_thread();
  reset_memory_by_account();
  reset_status_by_thread();
  reset_status_by_account();
  purge_all_account();
  return 0;
}

table_accounts::table_accounts() : cursor_by_account(&m_share) {}

int table_accounts::index_init(uint, bool) {
  PFS_index_accounts *result = NULL;
  result = PFS_NEW(PFS_index_accounts_by_user_host);
  m_opened_index = result;
  m_index = result;
  return 0;
}

int table_accounts::make_row(PFS_account *pfs) {
  pfs_optimistic_state lock;

  pfs->m_lock.begin_optimistic_lock(&lock);

  if (m_row.m_account.make_row(pfs)) {
    return HA_ERR_RECORD_DELETED;
  }

  PFS_connection_stat_visitor visitor;
  PFS_connection_iterator::visit_account(pfs, true, /* threads */
                                         false,     /* THDs */
                                         &visitor);

  if (!pfs->m_lock.end_optimistic_lock(&lock)) {
    return HA_ERR_RECORD_DELETED;
  }

  m_row.m_connection_stat.set(&visitor.m_stat);
  return 0;
}

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

  /* Set the null bits */
  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: /* USER */
        case 1: /* HOST */
          m_row.m_account.set_field(f->field_index, f);
          break;
        case 2: /* CURRENT_CONNECTIONS */
        case 3: /* TOTAL_CONNECTIONS */
          m_row.m_connection_stat.set_field(f->field_index - 2, f);
          break;
        default:
          DBUG_ASSERT(false);
      }
    }
  }
  return 0;
}