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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/Util_DebugPurgeLog_Reader.php |
<?php
namespace W3TC;
/**
* Reads purge log from the end to top to get last records
*/
class Util_DebugPurgeLog_Reader {
private $lines = array();
private $current_item = array();
private function __construct() {
}
static public function read( $module ) {
$o = new Util_DebugPurgeLog_Reader();
return $o->_read( $module );
}
private function _read( $module ) {
$log_filename = Util_Debug::log_filename( $module . '-purge' );
if ( !file_exists( $log_filename) ) {
return array();
}
$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 = '';
$more_log_needed = true;
while ( $pos >= 0 ) {
$to_read = 26;
$pos -= $to_read;
if ( $pos <= 0 ) {
$to_read = $to_read + $pos;
$pos = 0;
}
fseek( $h, $pos );
$s = fread( $h, $to_read );
$unparsed_head = $this->parse_string( $s . $unparsed_head );
if ( count( $this->lines ) > 100 ) {
break;
}
if ( $pos <= 0 ) {
$this->push_line( $unparsed_head );
break;
}
}
return $this->lines;
}
private function parse_string( $s ) {
$first_unparsed = strlen( $s );
$pos = $first_unparsed;
for ( ; $pos >= 0; $pos-- ) {
$c = substr( $s, $pos, 1 );
if ( $c == "\r" || $c == "\n" ) {
$this->push_line( substr( $s, $pos + 1, $first_unparsed - $pos - 1 ) );
$first_unparsed = $pos;
}
}
return substr( $s, 0, $first_unparsed );
}
private function push_line( $line ) {
if ( empty( $line ) ) {
return;
}
if ( substr( $line, 0, 1) == "\t" ) {
array_unshift( $this->current_item, $line );
return;
}
// split secondary lines to urls and backtrace
$postfix = array();
$backtrace = array();
$username = '';
foreach ( $this->current_item as $item ) {
$item = trim( $item );
if ( preg_match( '~^(#[^ ]+) ([^:]+): (.*)~', $item, $m ) ) {
$backtrace[] = array(
'number' => $m[1],
'filename' => $m[2],
'function' => $m[3]
);
} elseif ( preg_match( '~^username:(.*)~', $item, $m ) ) {
$username = $m[1];
} else {
$postfix[] = $item;
}
}
$m = null;
if ( preg_match( '~\\[([^\\]]+)\\] (.*)~', $line, $m ) ) {
$this->lines[] = array(
'date' => $m[1],
'message' => $m[2],
'username' => $username,
'postfix' => $postfix,
'backtrace' => $backtrace
);
}
$this->current_item = array();
}
}