<?php

/**
 * @file
 * Install and update for Performance Logging
 *
 * Copyright Khalid Baheyeldin 2008 of http://2bits.com
 */

// Minimum APC shm memory size to require
define('PERFORMANCE_MIN_MEMORY', 48);

function performance_schema() {
  $schema = array();

  $schema['performance_summary'] = array(
    'fields' => array(
      'path'            => array('type' => 'varchar', 'length' => '255', 'not null' => TRUE, 'default' => ''),
      'last_access'     => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'bytes_max'       => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'bytes_avg'       => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'ms_max'          => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'ms_avg'          => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'query_count_max' => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'query_count_avg' => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'query_timer_max' => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'query_timer_avg' => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
      'num_accesses'    => array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11'),
    ),
    'primary key' => array('path'),
    'indexes' => array(
      'last_access' => array('last_access')),
  );

  $schema['performance_detail'] = array(
    'fields' => array(
      'pid'         => array('type' => 'serial', 'not null' => TRUE, 'disp-width' => '11'),
      'timestamp'   => array('type' => 'int', 'not null' => TRUE,  'default' => 0, 'disp-width' => '11'),
      'bytes'       => array('type' => 'int', 'not null' => TRUE,  'default' => 0, 'disp-width' => '11'),
      'ms'          => array('type' => 'int', 'not null' => TRUE,  'default' => 0, 'disp-width' => '11'),
      'query_count' => array('type' => 'int', 'not null' => TRUE,  'default' => 0, 'disp-width' => '11'),
      'query_timer' => array('type' => 'int', 'not null' => TRUE,  'default' => 0, 'disp-width' => '11'),
      'anon'        => array('type' => 'int', 'not null' => FALSE, 'default' => 1, 'disp-width' => '1'),
      'path'        => array('type' => 'varchar', 'length' => '255', 'not null' => FALSE),
      'data'        => array('type' => 'blob', 'not null' => FALSE, 'size' => 'big'),
    ),
    'primary key' => array('pid'),
    'indexes' => array(
      'timestamp' => array('timestamp')),
  );

  return $schema;
}

function performance_install() {

  // Set the weight so this module runs last
  db_query("UPDATE {system} SET weight = 3000 WHERE name = 'performance'");
}

function performance_uninstall() {
  db_query("DELETE FROM {variable} WHERE name LIKE 'performance%'");
}

function performance_requirements($phase) {
  $requirements = array();

  if ($phase != 'runtime') {
    return $requirements;
  }

  if (variable_get('performance_detail', 0)) {
    $requirements['performance_detail'] = array(
      'title'       => t('Performance logging details'),
      'value'       => 'Enabled',
      'severity'    => REQUIREMENT_WARNING,
      'description' => t('Performance detailed logging is <a href="@link">enabled</a>. This can cause severe issues on live sites.', array('@link' => url('admin/config/development/performance_logging'))),
    );
  }

  if (variable_get('devel_query_display', FALSE)) {
    if (variable_get('performance_detail', 0) ||
        variable_get('performance_summary_db', 0) ||
        variable_get('performance_summary_apc', 0)) {
      $requirements['performance_query'] = array(
        'title'       => t('Performance logging query'),
        'value'       => 'Enabled',
        'severity'    => REQUIREMENT_WARNING,
        'description' => t('Query timing and count logging is <a href="@link">enabled</a>. This can cause memory size per page to be larger than normal.', array('@link' => url('admin/config/development/performance_logging'))),
      );
    }
  }

  if (!function_exists('apc_fetch')) {
    $requirements['performance_apc'] = array(
      'title'       => t('Performance logging APC'),
      'value'       => 'Disabled',
      'severity'    => REQUIREMENT_WARNING,
      'description' => t('Performance logging on live web sites works best if APC is enabled.'),
    );
  }

  $shm_size = ini_get('apc.shm_size');
  if (function_exists('apc_fetch') && $shm_size < PERFORMANCE_MIN_MEMORY) {
    $requirements['performance_apc_mem'] = array(
      'title'       => t('Performance logging APC memory size'),
      'value'       => $shm_size,
      'severity'    => REQUIREMENT_WARNING,
      'description' => t('APC has been configured for !size, which is less than the recommended !min_memory MB of memory. If you encounter errors when viewing the summary report, then try to increase that limit for APC.', array('!size' => 1*$shm_size, '!min_memory' => PERFORMANCE_MIN_MEMORY)),
    );
  }

  return $requirements;
}

function performance_update_1() {
  $ret = array();
  db_drop_field($ret, 'performance_detail', 'title');
  db_drop_field($ret, 'performance_summary', 'title');
  return $ret;
}

function performance_update_2() {
  $ret = array();
  db_add_field($ret, 'performance_detail', 'data', array('type' => 'blob', 'not null' => FALSE, 'size' => 'big'));
  return $ret;
}

/**
 * Harmonize notations for milliseconds to "ms".
 *
 * @return array
 */
function performance_update_7001() {
  $int_field = array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'disp-width' => '11');

  db_change_field('performance_summary', 'millisecs_max', 'ms_max', $int_field);
  db_change_field('performance_summary', 'millisecs_avg', 'ms_avg', $int_field);
  db_change_field('performance_detail',  'millisecs',     'ms',     $int_field);

  // We don't have a cache update method, so it's better to clear it
  if (function_exists('apc_fetch')) {
    apc_clear_cache('user');
  }
}