polardbxengine/storage/perfschema/table_table_handles.cc

/* Copyright (c) 2012, 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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  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
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  permission to link the program and your derivative works with the
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  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_table_handles.cc
  Table TABLE_TABLE_HANDLES (implementation).
*/

#include "storage/perfschema/table_table_handles.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_buffer_container.h"
#include "storage/perfschema/pfs_column_types.h"
#include "storage/perfschema/pfs_column_values.h"
#include "storage/perfschema/pfs_global.h"
#include "storage/perfschema/pfs_instr_class.h"
#include "storage/perfschema/pfs_stat.h"

THR_LOCK table_table_handles::m_table_lock;

Plugin_table table_table_handles::m_table_def(
    /* Schema name */
    "performance_schema",
    /* Name */
    "table_handles",
    /* Definition */
    "  OBJECT_TYPE VARCHAR(64) not null,\n"
    "  OBJECT_SCHEMA VARCHAR(64) not null,\n"
    "  OBJECT_NAME VARCHAR(64) not null,\n"
    "  OBJECT_INSTANCE_BEGIN BIGINT unsigned not null,\n"
    "  OWNER_THREAD_ID BIGINT unsigned,\n"
    "  OWNER_EVENT_ID BIGINT unsigned,\n"
    "  INTERNAL_LOCK VARCHAR(64),\n"
    "  EXTERNAL_LOCK VARCHAR(64),\n"
    "  PRIMARY KEY (OBJECT_INSTANCE_BEGIN) USING HASH,\n"
    "  KEY (OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME) USING HASH,\n"
    "  KEY (OWNER_THREAD_ID, OWNER_EVENT_ID) USING HASH\n",
    /* Options */
    " ENGINE=PERFORMANCE_SCHEMA",
    /* Tablespace */
    nullptr);

PFS_engine_table_share table_table_handles::m_share = {
    &pfs_readonly_acl,
    table_table_handles::create,
    NULL, /* write_row */
    NULL, /* delete_all_rows */
    table_table_handles::get_row_count,
    sizeof(PFS_simple_index),
    &m_table_lock,
    &m_table_def,
    false, /* perpetual */
    PFS_engine_table_proxy(),
    {0},
    false /* m_in_purgatory */
};

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

  PFS_table_share *share = sanitize_table_share(pfs->m_share);

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

  if (m_fields >= 3) {
    if (!m_key_3.match(share)) {
      return false;
    }
  }

  return true;
}

bool PFS_index_table_handles_by_instance::match(PFS_table *pfs) {
  if (m_fields >= 1) {
    if (!m_key.match(pfs)) {
      return false;
    }
  }

  return true;
}

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

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

  return true;
}

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

ha_rows table_table_handles::get_row_count(void) {
  return global_table_container.get_row_count();
}

table_table_handles::table_table_handles()
    : PFS_engine_table(&m_share, &m_pos), m_pos(0), m_next_pos(0) {}

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

int table_table_handles::rnd_init(bool) { return 0; }

int table_table_handles::rnd_next(void) {
  PFS_table *pfs;

  m_pos.set_at(&m_next_pos);
  PFS_table_iterator it = global_table_container.iterate(m_pos.m_index);
  pfs = it.scan_next(&m_pos.m_index);
  if (pfs != NULL) {
    m_next_pos.set_after(&m_pos);
    return make_row(pfs);
  }

  return HA_ERR_END_OF_FILE;
}

int table_table_handles::rnd_pos(const void *pos) {
  PFS_table *pfs;

  set_position(pos);

  pfs = global_table_container.get(m_pos.m_index);
  if (pfs != NULL) {
    return make_row(pfs);
  }

  return HA_ERR_RECORD_DELETED;
}

int table_table_handles::index_init(uint idx, bool) {
  PFS_index_table_handles *result = NULL;

  switch (idx) {
    case 0:
      result = PFS_NEW(PFS_index_table_handles_by_instance);
      break;
    case 1:
      result = PFS_NEW(PFS_index_table_handles_by_object);
      break;
    case 2:
      result = PFS_NEW(PFS_index_table_handles_by_owner);
      break;
    default:
      DBUG_ASSERT(false);
      break;
  }

  m_opened_index = result;
  m_index = result;
  return 0;
}

int table_table_handles::index_next(void) {
  PFS_table *pfs;

  m_pos.set_at(&m_next_pos);
  PFS_table_iterator it = global_table_container.iterate(m_pos.m_index);

  do {
    pfs = it.scan_next(&m_pos.m_index);
    if (pfs != NULL) {
      if (m_opened_index->match(pfs)) {
        if (!make_row(pfs)) {
          m_next_pos.set_after(&m_pos);
          return 0;
        }
      }
    }
  } while (pfs != NULL);

  return HA_ERR_END_OF_FILE;
}

int table_table_handles::make_row(PFS_table *table) {
  pfs_optimistic_state lock;
  PFS_table_share *share;
  PFS_thread *thread;

  table->m_lock.begin_optimistic_lock(&lock);

  share = sanitize_table_share(table->m_share);
  if (share == NULL) {
    return HA_ERR_RECORD_DELETED;
  }

  if (m_row.m_object.make_row(share)) {
    return HA_ERR_RECORD_DELETED;
  }

  m_row.m_identity = table->m_identity;

  thread = sanitize_thread(table->m_thread_owner);
  if (thread != NULL) {
    m_row.m_owner_thread_id = thread->m_thread_internal_id;
    m_row.m_owner_event_id = table->m_owner_event_id;
  } else {
    m_row.m_owner_thread_id = 0;
    m_row.m_owner_event_id = 0;
  }

  m_row.m_internal_lock = table->m_internal_lock;
  m_row.m_external_lock = table->m_external_lock;

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

  return 0;
}

int table_table_handles::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: /* OBJECT_TYPE */
        case 1: /* OBJECT_SCHEMA */
        case 2: /* OBJECT_NAME */
          m_row.m_object.set_field(f->field_index, f);
          break;
        case 3: /* OBJECT_INSTANCE_BEGIN */
          set_field_ulonglong(f, (intptr)m_row.m_identity);
          break;
        case 4: /* OWNER_THREAD_ID */
          if (m_row.m_owner_thread_id != 0) {
            set_field_ulonglong(f, m_row.m_owner_thread_id);
          } else {
            f->set_null();
          }
          break;
        case 5: /* OWNER_EVENT_ID */
          if (m_row.m_owner_event_id != 0) {
            set_field_ulonglong(f, m_row.m_owner_event_id);
          } else {
            f->set_null();
          }
          break;
        case 6: /* INTERNAL_LOCK */
          set_field_lock_type(f, m_row.m_internal_lock);
          break;
        case 7: /* EXTERNAL_LOCK */
          set_field_lock_type(f, m_row.m_external_lock);
          break;
        default:
          DBUG_ASSERT(false);
      }
    }
  }

  return 0;
}