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