| Current Path : /storage/v11800/affypharma/public_html/wp-content/plugins/w3-total-cache/ |
Linux v11800 5.3.0-1023-aws #25~18.04.1-Ubuntu SMP Fri Jun 5 15:19:18 UTC 2020 aarch64
|
| Current File : /storage/v11800/affypharma/public_html/wp-content/plugins/w3-total-cache/UsageStatistics_Source_ObjectCacheLog.php |
<?php
namespace W3TC;
/**
* database queries debug log reader - provides data from this logfile
*/
class UsageStatistics_Source_ObjectCacheLog {
// running values
private $timestamp_start;
private $sort_column;
private $by_group = array();
/* if need to read more access log chunks */
private $more_log_needed = true;
function __construct( $timestamp_start, $sort_column ) {
$this->timestamp_start = $timestamp_start;
$this->sort_column = $sort_column;
}
/**
* Lists entries from log
**/
public function list_entries() {
$log_filename = Util_Debug::log_filename( 'objectcache-calls' );
$h = @fopen( $log_filename, 'rb' );
if ( !$h ) {
throw new \Exception( 'Failed to open log file' . $log_filename );
}
fseek( $h, 0, SEEK_END );
$pos = ftell( $h );
$unparsed_head = '';
while ( $pos >= 0 && $this->more_log_needed ) {
$pos -= 8192;
if ( $pos <= 0 ) {
$pos = 0;
}
fseek( $h, $pos );
$s = fread( $h, 8192 );
$unparsed_head = $this->parse_string( $s . $unparsed_head, $pos > 0 );
if ( $pos <= 0 ) {
$this->more_log_needed = false;
}
}
$output = array();
foreach ( $this->by_group as $group => $data ) {
$output[] = array(
'group' => $group,
'count_total' => $data['count_total'],
'count_get_total' => $data['count_get_total'],
'count_get_hit' => $data['count_get_hit'],
'count_set' => $data['count_set'],
'sum_size' => $data['sum_size'],
'avg_size' => $data['count_total'] ? (int)( $data['sum_size'] / $data['count_total'] ) : 0,
'sum_time_ms' => (int)$data['sum_time_ms']
);
}
usort( $output, function($a, $b) {
return (int)($b[$this->sort_column]) - (int)($a[$this->sort_column]);
});
$output = array_slice( $output, 0, 200 );
return $output;
}
private function parse_string( $s, $skip_first_line ) {
$s_length = strlen( $s );
$unparsed_head = '';
$n = 0;
if ( $skip_first_line ) {
for ( ; $n < $s_length; $n++ ) {
$c = substr( $s, $n, 1 );
if ( $c == "\r" || $c == "\n" ) {
$unparsed_head = substr( $s, 0, $n + 1 );
break;
}
}
}
$line_start = $n;
for ( ; $n < $s_length; $n++ ) {
$c = substr( $s, $n, 1 );
if ( $c == "\r" || $c == "\n" ) {
if ( $n > $line_start ) {
$this->push_line( substr( $s, $line_start, $n - $line_start ) );
}
$line_start = $n + 1;
}
}
return $unparsed_head;
}
private function push_line( $line ) {
$matches = str_getcsv( $line, "\t" );
if ( !$matches ) {
return;
}
$date_string = $matches[0];
$op = $matches[1];
$group = $matches[2];
$id = $matches[3];
$reason = $matches[4];
$size = (int)$matches[5];
$time_taken_ms = isset( $matches[6] ) ? (float)$matches[6] / 1000 : 0;
$time = strtotime($date_string);
// dont read more if we touched entries before timeperiod of collection
if ( $time < $this->timestamp_start ) {
$this->more_log_needed = false;
}
if ( $reason == 'not tried cache' ||
substr( $reason, 0, 7 ) == 'not set' ) {
return; // it's not cache-related activity
}
if ( !isset( $this->by_group[$group] ) ) {
$this->by_group[$group] = array(
'count_total' => 0,
'count_get_total' => 0,
'count_get_hit' => 0,
'count_set' => 0,
'sum_size' => 0,
'sum_time_ms' => 0
);
}
if ( $op == 'get' ) {
$this->by_group[$group]['count_total']++;
$this->by_group[$group]['count_get_total']++;
if ($reason == 'from persistent cache') {
$this->by_group[$group]['count_get_hit']++;
}
} elseif ( $op == 'set' ) {
$this->by_group[$group]['count_total']++;
$this->by_group[$group]['count_set']++;
}
$this->by_group[$group]['sum_size'] += $size;
$this->by_group[$group]['sum_time_ms'] += $time_taken_ms;
}
}