154 lines
3.4 KiB
PHP
154 lines
3.4 KiB
PHP
<?php
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namespace W3TC;
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/**
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* database queries debug log reader - provides data from this logfile
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*/
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class UsageStatistics_Source_DbQueriesLog {
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// running values
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private $timestamp_start;
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private $sort_column;
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private $by_query = array();
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/* if need to read more access log chunks */
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private $more_log_needed = true;
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function __construct( $timestamp_start, $sort_column ) {
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$this->timestamp_start = $timestamp_start;
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$this->sort_column = $sort_column;
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}
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/**
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* Lists entries from log
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**/
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public function list_entries() {
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$log_filename = Util_Debug::log_filename( 'dbcache-queries' );
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$h = @fopen( $log_filename, 'rb' );
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if ( !$h ) {
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throw new \Exception( 'Failed to open log file' . $log_filename );
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}
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fseek( $h, 0, SEEK_END );
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$pos = ftell( $h );
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$unparsed_head = '';
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while ( $pos >= 0 && $this->more_log_needed ) {
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$pos -= 8192;
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if ( $pos <= 0 ) {
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$pos = 0;
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}
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fseek( $h, $pos );
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$s = fread( $h, 8192 );
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$unparsed_head = $this->parse_string( $s . $unparsed_head, $pos > 0 );
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if ( $pos <= 0 ) {
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$this->more_log_needed = false;
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}
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}
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$output = array();
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foreach ( $this->by_query as $query => $data ) {
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$output[] = array(
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'query' => $query,
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'count_total' => $data['count_total'],
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'count_hit' => $data['count_hit'],
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'avg_size' => (int)( $data['sum_size'] / $data['count_total'] ),
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'avg_time_ms' => (int)( $data['sum_time_ms'] / $data['count_total'] ),
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'sum_time_ms' => (int)$data['sum_time_ms'],
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'reasons' => $data['reasons']
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);
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}
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usort( $output, function($a, $b) {
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return (int)($b[$this->sort_column]) - (int)($a[$this->sort_column]);
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});
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$output = array_slice( $output, 0, 200 );
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return $output;
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}
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private function parse_string( $s, $skip_first_line ) {
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$s_length = strlen( $s );
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$unparsed_head = '';
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$n = 0;
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if ( $skip_first_line ) {
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for ( ; $n < $s_length; $n++ ) {
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$c = substr( $s, $n, 1 );
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if ( $c == "\r" || $c == "\n" ) {
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$unparsed_head = substr( $s, 0, $n + 1 );
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break;
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}
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}
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}
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$line_start = $n;
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for ( ; $n < $s_length; $n++ ) {
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$c = substr( $s, $n, 1 );
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if ( $c == "\r" || $c == "\n" ) {
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if ( $n > $line_start ) {
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$this->push_line( substr( $s, $line_start, $n - $line_start ) );
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}
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$line_start = $n + 1;
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}
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}
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return $unparsed_head;
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}
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private function push_line( $line ) {
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$matches = str_getcsv( $line, "\t" );
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if ( !$matches ) {
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return;
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}
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$date_string = $matches[0];
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$query = $matches[2];
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$time_taken_ms = isset( $matches[3] ) ? (float)$matches[3] / 1000 : 0;
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$reason = isset( $matches[4] ) ? $matches[4] : '';
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$hit = isset( $matches[5] ) ? $matches[5] : false;
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$size = isset( $matches[6] ) ? $matches[6] : 0;
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$time = strtotime($date_string);
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// dont read more if we touched entries before timeperiod of collection
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if ( $time < $this->timestamp_start ) {
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$this->more_log_needed = false;
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}
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if ( !isset( $this->by_query[$query] ) ) {
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$this->by_query[$query] = array(
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'count_total' => 0,
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'count_hit' => 0,
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'sum_size' => 0,
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'sum_time_ms' => 0,
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'reasons' => array()
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);
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}
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$this->by_query[$query]['count_total']++;
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if ($hit) {
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$this->by_query[$query]['count_hit']++;
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}
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$this->by_query[$query]['sum_size'] += $size;
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$this->by_query[$query]['sum_time_ms'] += $time_taken_ms;
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if ( !in_array( $reason, $this->by_query[$query]['reasons']) ) {
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$this->by_query[$query]['reasons'][] = $reason;
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}
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}
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}
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