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<?php
namespace W3TC;
/**
* PageCache debug log reader - provides data from this logfile
*/
class UsageStatistics_Source_PageCacheLog {
// running values
private $timestamp_start;
private $process_status;
private $sort_column;
private $by_uri = array();
/* if need to read more access log chunks */
private $more_log_needed = true;
function __construct( $timestamp_start, $process_status, $sort_column ) {
$this->timestamp_start = $timestamp_start;
$this->process_status = $process_status;
$this->sort_column = $sort_column;
}
/**
* Lists entries from log with specified cache reject reason code
**/
public function list_entries() {
$log_filename = Util_Debug::log_filename( 'pagecache' );
$h = @fopen( $log_filename, 'rb' );
if ( !$h ) {
throw new \Exception( 'Failed to open pagecache 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_uri as $uri => $data ) {
$output[] = array(
'uri' => $uri,
'count' => $data['count'],
'avg_size' => (int)( $data['sum_size'] / $data['count'] ),
'avg_time_ms' => (int)( $data['sum_time_ms'] / $data['count'] ),
'sum_time_ms' => $data['sum_time_ms'],
'reasons' => $data['reasons']
);
}
usort( $output, function($a, $b) {
return (int)($b[$this->sort_column]) - (int)($a[$this->sort_column]);
});
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 = null;
preg_match(
'/\[([^>\]]+)\] \[([^>\]]+)\] \[([^>\]]+)\] finished in (\d+) size (\d+) with process status ([^ ]+) reason (.*)/',
$line, $matches);
if ( !$matches ) {
return;
}
$date_string = $matches[1];
$uri = $matches[2];
$time_taken_ms = $matches[4];
$size = $matches[5];
$status = $matches[6];
$reason = $matches[7];
$time = strtotime($date_string);
// dont read more if we touched entries before timeperiod of collection
if ( $time < $this->timestamp_start ) {
$this->more_log_needed = false;
}
if ( $status != $this->process_status ) {
return;
}
if ( !isset( $this->by_uri[$uri] ) ) {
$this->by_uri[$uri] = array(
'count' => 0,
'sum_size' => 0,
'sum_time_ms' => 0,
'reasons' => array()
);
}
$this->by_uri[$uri]['count']++;
$this->by_uri[$uri]['sum_size'] += $size;
$this->by_uri[$uri]['sum_time_ms'] += $time_taken_ms;
if ( !in_array( $reason, $this->by_uri[$uri]['reasons']) ) {
$this->by_uri[$uri]['reasons'][] = $reason;
}
}
}