/* Copyright (c) 2010, 2023, Oracle and/or its affiliates.

  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,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

/**
  @file storage/perfschema/table_events_stages.cc
  Table EVENTS_STAGES_xxx (implementation).
*/

#include "my_global.h"
#include "my_thread.h"
#include "table_events_stages.h"
#include "pfs_instr_class.h"
#include "pfs_instr.h"
#include "pfs_events_stages.h"
#include "pfs_timer.h"
#include "pfs_buffer_container.h"
#include "field.h"

THR_LOCK table_events_stages_current::m_table_lock;

PFS_engine_table_share_state
table_events_stages_current::m_share_state = {
  false /* m_checked */
};

PFS_engine_table_share
table_events_stages_current::m_share=
{
  { C_STRING_WITH_LEN("events_stages_current") },
  &pfs_truncatable_acl,
  table_events_stages_current::create,
  NULL, /* write_row */
  table_events_stages_current::delete_all_rows,
  table_events_stages_current::get_row_count,
  sizeof(PFS_simple_index), /* ref length */
  &m_table_lock,
  { C_STRING_WITH_LEN("CREATE TABLE events_stages_current("
                      "THREAD_ID BIGINT unsigned not null comment 'Thread associated with the event. Together with EVENT_ID uniquely identifies the row.',"
                      "EVENT_ID BIGINT unsigned not null comment 'Thread''s current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.',"
                      "END_EVENT_ID BIGINT unsigned comment 'NULL when the event starts, set to the thread''s current event number at the end of the event.',"
                      "EVENT_NAME VARCHAR(128) not null comment 'Event instrument name and a NAME from the setup_instruments table',"
                      "SOURCE VARCHAR(64) comment 'Name and line number of the source file containing the instrumented code that produced the event.',"
                      "TIMER_START BIGINT unsigned comment 'Value in picoseconds when the event timing started or NULL if timing is not collected.',"
                      "TIMER_END BIGINT unsigned comment 'Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.',"
                      "TIMER_WAIT BIGINT unsigned comment 'Value in picoseconds of the event''s duration or NULL if the event has not ended or timing is not collected.',"
                      "WORK_COMPLETED BIGINT unsigned comment 'The number of work units completed for the stage. NULL if the stage event progress is not instrumented.',"
                      "WORK_ESTIMATED BIGINT unsigned comment 'The number of work units expected for the stage. NULL if the stage event progress is not instrumented.',"
                      "NESTING_EVENT_ID BIGINT unsigned comment 'EVENT_ID of event within which this event nests.',"
                      "NESTING_EVENT_TYPE ENUM('TRANSACTION', 'STATEMENT', 'STAGE', 'WAIT') comment 'Nesting event type. Either transaction, statement, stage or wait.')") },
  false, /* m_perpetual */
  false, /* m_optional */
  &m_share_state
};

THR_LOCK table_events_stages_history::m_table_lock;

PFS_engine_table_share_state
table_events_stages_history::m_share_state = {
  false /* m_checked */
};

PFS_engine_table_share
table_events_stages_history::m_share=
{
  { C_STRING_WITH_LEN("events_stages_history") },
  &pfs_truncatable_acl,
  table_events_stages_history::create,
  NULL, /* write_row */
  table_events_stages_history::delete_all_rows,
  table_events_stages_history::get_row_count,
  sizeof(pos_events_stages_history), /* ref length */
  &m_table_lock,
  { C_STRING_WITH_LEN("CREATE TABLE events_stages_history("
                      "THREAD_ID BIGINT unsigned not null comment 'Thread associated with the event. Together with EVENT_ID uniquely identifies the row.',"
                      "EVENT_ID BIGINT unsigned not null comment 'Thread''s current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.',"
                      "END_EVENT_ID BIGINT unsigned comment 'NULL when the event starts, set to the thread''s current event number at the end of the event.',"
                      "EVENT_NAME VARCHAR(128) not null comment 'Event instrument name and a NAME from the setup_instruments table',"
                      "SOURCE VARCHAR(64) comment 'Name and line number of the source file containing the instrumented code that produced the event.',"
                      "TIMER_START BIGINT unsigned comment 'Value in picoseconds when the event timing started or NULL if timing is not collected.',"
                      "TIMER_END BIGINT unsigned comment 'Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.',"
                      "TIMER_WAIT BIGINT unsigned comment 'Value in picoseconds of the event''s duration or NULL if the event has not ended or timing is not collected.',"
                      "WORK_COMPLETED BIGINT unsigned comment 'The number of work units completed for the stage. NULL if the stage event progress is not instrumented.',"
                      "WORK_ESTIMATED BIGINT unsigned comment 'The number of work units expected for the stage. NULL if the stage event progress is not instrumented.',"
                      "NESTING_EVENT_ID BIGINT unsigned comment 'EVENT_ID of event within which this event nests.',"
                      "NESTING_EVENT_TYPE ENUM('TRANSACTION', 'STATEMENT', 'STAGE', 'WAIT') comment 'Nesting event type. Either transaction, statement, stage or wait.')") },
  false, /* m_perpetual */
  false, /* m_optional */
  &m_share_state
};

THR_LOCK table_events_stages_history_long::m_table_lock;

PFS_engine_table_share_state
table_events_stages_history_long::m_share_state = {
  false /* m_checked */
};

PFS_engine_table_share
table_events_stages_history_long::m_share=
{
  { C_STRING_WITH_LEN("events_stages_history_long") },
  &pfs_truncatable_acl,
  table_events_stages_history_long::create,
  NULL, /* write_row */
  table_events_stages_history_long::delete_all_rows,
  table_events_stages_history_long::get_row_count,
  sizeof(PFS_simple_index), /* ref length */
  &m_table_lock,
  { C_STRING_WITH_LEN("CREATE TABLE events_stages_history_long("
                      "THREAD_ID BIGINT unsigned not null comment 'Thread associated with the event. Together with EVENT_ID uniquely identifies the row.',"
                      "EVENT_ID BIGINT unsigned not null comment 'Thread''s current event number at the start of the event. Together with THREAD_ID uniquely identifies the row.',"
                      "END_EVENT_ID BIGINT unsigned comment 'NULL when the event starts, set to the thread''s current event number at the end of the event.',"
                      "EVENT_NAME VARCHAR(128) not null comment 'Event instrument name and a NAME from the setup_instruments table',"
                      "SOURCE VARCHAR(64) comment 'Name and line number of the source file containing the instrumented code that produced the event.',"
                      "TIMER_START BIGINT unsigned comment 'Value in picoseconds when the event timing started or NULL if timing is not collected.',"
                      "TIMER_END BIGINT unsigned comment 'Value in picoseconds when the event timing ended, or NULL if the event has not ended or timing is not collected.',"
                      "TIMER_WAIT BIGINT unsigned comment 'Value in picoseconds of the event''s duration or NULL if the event has not ended or timing is not collected.',"
                      "WORK_COMPLETED BIGINT unsigned comment 'The number of work units completed for the stage. NULL if the stage event progress is not instrumented.',"
                      "WORK_ESTIMATED BIGINT unsigned comment 'The number of work units expected for the stage. NULL if the stage event progress is not instrumented.',"
                      "NESTING_EVENT_ID BIGINT unsigned comment 'EVENT_ID of event within which this event nests.',"
                      "NESTING_EVENT_TYPE ENUM('TRANSACTION', 'STATEMENT', 'STAGE', 'WAIT') comment 'Nesting event type. Either transaction, statement, stage or wait.')") },
  false, /* m_perpetual */
  false, /* m_optional */
  &m_share_state
};

table_events_stages_common::table_events_stages_common
(const PFS_engine_table_share *share, void *pos)
  : PFS_engine_table(share, pos),
  m_row_exists(false)
{
  m_normalizer = time_normalizer::get_stage();
}

/**
  Build a row.
  @param stage                      the stage the cursor is reading
*/
void table_events_stages_common::make_row(PFS_events_stages *stage)
{
  ulonglong timer_end;

  m_row_exists= false;

  PFS_stage_class *unsafe= (PFS_stage_class*) stage->m_class;
  PFS_stage_class *klass= sanitize_stage_class(unsafe);
  if (unlikely(klass == NULL))
    return;

  m_row.m_thread_internal_id= stage->m_thread_internal_id;
  m_row.m_event_id= stage->m_event_id;
  m_row.m_end_event_id= stage->m_end_event_id;
  m_row.m_nesting_event_id= stage->m_nesting_event_id;
  m_row.m_nesting_event_type= stage->m_nesting_event_type;

  if (m_row.m_end_event_id == 0)
  {
    timer_end= get_stage_timer();
  }
  else
  {
    timer_end= stage->m_timer_end;
  }

  m_normalizer->to_pico(stage->m_timer_start, timer_end,
                      & m_row.m_timer_start, & m_row.m_timer_end, & m_row.m_timer_wait);

  m_row.m_name= klass->m_name;
  m_row.m_name_length= klass->m_name_length;

  /* Disable source file and line to avoid stale __FILE__ pointers. */
  m_row.m_source_length= 0;

  if (klass->is_progress())
  {
    m_row.m_progress= true;
    m_row.m_work_completed= stage->m_progress.m_work_completed;
    m_row.m_work_estimated= stage->m_progress.m_work_estimated;
  }
  else
  {
    m_row.m_progress= false;
  }

  m_row_exists= true;
  return;
}

int table_events_stages_common::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;

  /* Set the null bits */
  assert(table->s->null_bytes == 2);
  buf[0]= 0;
  buf[1]= 0;

  for (; (f= *fields) ; fields++)
  {
    if (read_all || bitmap_is_set(table->read_set, f->field_index))
    {
      switch(f->field_index)
      {
      case 0: /* THREAD_ID */
        set_field_ulonglong(f, m_row.m_thread_internal_id);
        break;
      case 1: /* EVENT_ID */
        set_field_ulonglong(f, m_row.m_event_id);
        break;
      case 2: /* END_EVENT_ID */
        if (m_row.m_end_event_id > 0)
          set_field_ulonglong(f, m_row.m_end_event_id - 1);
        else
          f->set_null();
        break;
      case 3: /* EVENT_NAME */
        set_field_varchar_utf8(f, m_row.m_name, m_row.m_name_length);
        break;
      case 4: /* SOURCE */
        set_field_varchar_utf8(f, m_row.m_source, m_row.m_source_length);
        break;
      case 5: /* TIMER_START */
        if (m_row.m_timer_start != 0)
          set_field_ulonglong(f, m_row.m_timer_start);
        else
          f->set_null();
        break;
      case 6: /* TIMER_END */
        if (m_row.m_timer_end != 0)
          set_field_ulonglong(f, m_row.m_timer_end);
        else
          f->set_null();
        break;
      case 7: /* TIMER_WAIT */
        if (m_row.m_timer_wait != 0)
          set_field_ulonglong(f, m_row.m_timer_wait);
        else
          f->set_null();
        break;
      case 8: /* WORK_COMPLETED */
        if (m_row.m_progress)
          set_field_ulonglong(f, m_row.m_work_completed);
        else
          f->set_null();
        break;
      case 9: /* WORK_ESTIMATED */
        if (m_row.m_progress)
          set_field_ulonglong(f, m_row.m_work_estimated);
        else
          f->set_null();
        break;
      case 10: /* NESTING_EVENT_ID */
        if (m_row.m_nesting_event_id != 0)
          set_field_ulonglong(f, m_row.m_nesting_event_id);
        else
          f->set_null();
        break;
      case 11: /* NESTING_EVENT_TYPE */
        if (m_row.m_nesting_event_id != 0)
          set_field_enum(f, m_row.m_nesting_event_type);
        else
          f->set_null();
        break;
      default:
        assert(false);
      }
    }
  }
  return 0;
}

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

table_events_stages_current::table_events_stages_current()
  : table_events_stages_common(&m_share, &m_pos),
  m_pos(0), m_next_pos(0)
{}

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

int table_events_stages_current::rnd_init(bool scan)
{
  return 0;
}

int table_events_stages_current::rnd_next(void)
{
  PFS_thread *pfs_thread;
  PFS_events_stages *stage;

  m_pos.set_at(&m_next_pos);
  PFS_thread_iterator it= global_thread_container.iterate(m_pos.m_index);
  pfs_thread= it.scan_next(& m_pos.m_index);
  if (pfs_thread != NULL)
  {
    stage= &pfs_thread->m_stage_current;
    make_row(stage);
    m_next_pos.set_after(&m_pos);
    return 0;
  }

  return HA_ERR_END_OF_FILE;
}

int table_events_stages_current::rnd_pos(const void *pos)
{
  PFS_thread *pfs_thread;
  PFS_events_stages *stage;

  set_position(pos);

  pfs_thread= global_thread_container.get(m_pos.m_index);
  if (pfs_thread != NULL)
  {
    stage= &pfs_thread->m_stage_current;
    make_row(stage);
    return 0;
  }

  return HA_ERR_RECORD_DELETED;
}

int table_events_stages_current::delete_all_rows(void)
{
  reset_events_stages_current();
  return 0;
}

ha_rows
table_events_stages_current::get_row_count(void)
{
  return global_thread_container.get_row_count();
}

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

table_events_stages_history::table_events_stages_history()
  : table_events_stages_common(&m_share, &m_pos),
  m_pos(), m_next_pos()
{}

void table_events_stages_history::reset_position(void)
{
  m_pos.reset();
  m_next_pos.reset();
}

int table_events_stages_history::rnd_init(bool scan)
{
  return 0;
}

int table_events_stages_history::rnd_next(void)
{
  PFS_thread *pfs_thread;
  PFS_events_stages *stage;
  bool has_more_thread= true;

  if (events_stages_history_per_thread == 0)
    return HA_ERR_END_OF_FILE;

  for (m_pos.set_at(&m_next_pos);
       has_more_thread;
       m_pos.next_thread())
  {
    pfs_thread= global_thread_container.get(m_pos.m_index_1, & has_more_thread);
    if (pfs_thread != NULL)
    {
      if (m_pos.m_index_2 >= events_stages_history_per_thread)
      {
        /* This thread does not have more (full) history */
        continue;
      }

      if ( ! pfs_thread->m_stages_history_full &&
          (m_pos.m_index_2 >= pfs_thread->m_stages_history_index))
      {
        /* This thread does not have more (not full) history */
        continue;
      }

      stage= &pfs_thread->m_stages_history[m_pos.m_index_2];

      if (stage->m_class != NULL)
      {
        make_row(stage);
        /* Next iteration, look for the next history in this thread */
        m_next_pos.set_after(&m_pos);
        return 0;
      }
    }
  }

  return HA_ERR_END_OF_FILE;
}

int table_events_stages_history::rnd_pos(const void *pos)
{
  PFS_thread *pfs_thread;
  PFS_events_stages *stage;

  assert(events_stages_history_per_thread != 0);
  set_position(pos);

  assert(m_pos.m_index_2 < events_stages_history_per_thread);

  pfs_thread= global_thread_container.get(m_pos.m_index_1);
  if (pfs_thread != NULL)
  {
    if ( ! pfs_thread->m_stages_history_full &&
        (m_pos.m_index_2 >= pfs_thread->m_stages_history_index))
      return HA_ERR_RECORD_DELETED;

    stage= &pfs_thread->m_stages_history[m_pos.m_index_2];

    if (stage->m_class != NULL)
    {
      make_row(stage);
      return 0;
    }
  }

  return HA_ERR_RECORD_DELETED;
}

int table_events_stages_history::delete_all_rows(void)
{
  reset_events_stages_history();
  return 0;
}

ha_rows
table_events_stages_history::get_row_count(void)
{
  return events_stages_history_per_thread * global_thread_container.get_row_count();
}

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

table_events_stages_history_long::table_events_stages_history_long()
  : table_events_stages_common(&m_share, &m_pos),
  m_pos(0), m_next_pos(0)
{}

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

int table_events_stages_history_long::rnd_init(bool scan)
{
  return 0;
}

int table_events_stages_history_long::rnd_next(void)
{
  PFS_events_stages *stage;
  uint limit;

  if (events_stages_history_long_size == 0)
    return HA_ERR_END_OF_FILE;

  if (events_stages_history_long_full)
    limit= events_stages_history_long_size;
  else
    limit= events_stages_history_long_index.m_u32 % events_stages_history_long_size;

  for (m_pos.set_at(&m_next_pos); m_pos.m_index < limit; m_pos.next())
  {
    stage= &events_stages_history_long_array[m_pos.m_index];

    if (stage->m_class != NULL)
    {
      make_row(stage);
      /* Next iteration, look for the next entry */
      m_next_pos.set_after(&m_pos);
      return 0;
    }
  }

  return HA_ERR_END_OF_FILE;
}

int table_events_stages_history_long::rnd_pos(const void *pos)
{
  PFS_events_stages *stage;
  uint limit;

  if (events_stages_history_long_size == 0)
    return HA_ERR_RECORD_DELETED;

  set_position(pos);

  if (events_stages_history_long_full)
    limit= events_stages_history_long_size;
  else
    limit= events_stages_history_long_index.m_u32 % events_stages_history_long_size;

  if (m_pos.m_index > limit)
    return HA_ERR_RECORD_DELETED;

  stage= &events_stages_history_long_array[m_pos.m_index];

  if (stage->m_class == NULL)
    return HA_ERR_RECORD_DELETED;

  make_row(stage);
  return 0;
}

int table_events_stages_history_long::delete_all_rows(void)
{
  reset_events_stages_history_long();
  return 0;
}

ha_rows
table_events_stages_history_long::get_row_count(void)
{
  return events_stages_history_long_size;
}

