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<?php
/**
* File: UsageStatistics_Source_DbQueriesLog.php
*
* @package W3TC
*/
namespace W3TC;
/**
* Class UsageStatistics_Source_Wpdb
*
* Provides statistics data about requests made to mysql server
*/
class UsageStatistics_Source_Wpdb {
/**
* Total number of WPDB queries executed.
*
* @var int
*/
private $query_total = 0;
/**
* Initializes the usage statistics by registering filters and actions.
*
* This method sets up the necessary WordPress hooks for gathering usage statistics
* related to WPDB calls. It adds filters and actions to track query data and metrics
* as well as handle historical statistics.
*
* @return void
*/
public static function init() {
$o = new UsageStatistics_Source_Wpdb();
add_filter( 'query', array( $o, 'query' ) );
add_action( 'w3tc_usage_statistics_of_request', array( $o, 'w3tc_usage_statistics_of_request' ), 10, 1 );
add_filter( 'w3tc_usage_statistics_metrics', array( $o, 'w3tc_usage_statistics_metrics' ) );
add_filter( 'w3tc_usage_statistics_summary_from_history', array( $o, 'w3tc_usage_statistics_summary_from_history' ), 10, 2 );
}
/**
* Adds custom metrics for usage statistics.
*
* This method extends the default metrics with custom values, such as the total number
* of WPDB queries executed. This allows for the gathering of additional statistics related
* to database queries during usage reporting.
*
* @param array $metrics Existing metrics to be extended.
*
* @return array Updated array of metrics including custom metrics.
*/
public function w3tc_usage_statistics_metrics( $metrics ) {
return array_merge( $metrics, array( 'wpdb_calls_total' ) );
}
/**
* Summarizes usage statistics from historical data.
*
* This method calculates the total number of WPDB queries from the historical data
* and includes it in the summary. It also calculates the rate of queries per second
* over the given history period.
*
* @param array $summary Existing summary of usage statistics.
* @param array $history Historical usage data.
*
* @return array Updated summary with WPDB statistics.
*/
public function w3tc_usage_statistics_summary_from_history( $summary, $history ) {
// counters.
$wpdb_calls_total = Util_UsageStatistics::sum( $history, 'wpdb_calls_total' );
$summary['wpdb'] = array(
'calls_total' => Util_UsageStatistics::integer( $wpdb_calls_total ),
'calls_per_second' => Util_UsageStatistics::value_per_period_seconds( $wpdb_calls_total, $summary ),
);
return $summary;
}
/**
* Tracks usage statistics for the current request.
*
* This method adds the total number of WPDB queries executed during the current request
* to the storage object for reporting purposes. It is triggered at the end of a request
* to ensure accurate tracking.
*
* @param object $storage The storage object where statistics are recorded.
*
* @return void
*/
public function w3tc_usage_statistics_of_request( $storage ) {
$storage->counter_add( 'wpdb_calls_total', $this->query_total );
}
/**
* Intercepts a database query and tracks the number of queries.
*
* This method is called every time a WPDB query is executed. It increments the total
* query count (`$query_total`) for the current request and returns the query unchanged.
* This allows for tracking the number of WPDB queries executed.
*
* @param string $q The SQL query being executed.
*
* @return string The original SQL query.
*/
public function query( $q ) {
++$this->query_total;
return $q;
}
}