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<?php
/**
* Class MC4WP_Debug_Log_Reader
*/
class MC4WP_Debug_Log_Reader
{
/**
* @var resource|null
*/
private $handle;
/**
* @var string
*/
private static $regex = '/^(\[[\d \-\:]+\]) (\w+\:) (.*)$/S';
/**
* @var string
*/
private static $html_template = '<span class="time">$1</span> <span class="level">$2</span> <span class="message">$3</span>';
/**
* @var string The log file location.
*/
private $file;
/**
* MC4WP_Debug_Log_Reader constructor.
*
* @param $file
*/
public function __construct($file)
{
$this->file = $file;
}
/**
* @return string
*/
public function all()
{
return file_get_contents($this->file);
}
/**
* Sets file pointer to $n of lines from the end of file.
*
* @param int $n
*/
private function seek_line_from_end($n)
{
$line_count = 0;
// get line count
while (! feof($this->handle)) {
fgets($this->handle);
++$line_count;
}
// rewind to beginning
rewind($this->handle);
// calculate target
$target = $line_count - $n;
$target = $target > 1 ? $target : 1; // always skip first line because oh PHP header
$current = 0;
// keep reading until we're at target
while ($current < $target) {
fgets($this->handle);
++$current;
}
}
/**
* @return string|null
*/
public function read()
{
// open file if not yet opened
if (! is_resource($this->handle)) {
// doesn't exist?
if (! file_exists($this->file)) {
return null;
}
$this->handle = @fopen($this->file, 'r');
// unable to read?
if (! is_resource($this->handle)) {
return null;
}
// set pointer to 1000 files from EOF
$this->seek_line_from_end(1000);
}
// stop reading once we're at the end
if (feof($this->handle)) {
fclose($this->handle);
$this->handle = null;
return null;
}
// read line, up to 8kb
$text = fgets($this->handle);
// strip tags & trim
$text = strip_tags($text);
$text = trim($text);
return $text;
}
/**
* @return string
*/
public function read_as_html()
{
$line = $this->read();
// null means end of file
if (is_null($line)) {
return null;
}
// empty string means empty line, but not yet eof
if (empty($line)) {
return '';
}
$line = preg_replace(self::$regex, self::$html_template, $line);
return $line;
}
/**
* Reads X number of lines.
*
* If $start is negative, reads from end of log file.
*
* @param int $start
* @param int $number
* @return string
*/
public function lines($start, $number)
{
$handle = fopen($start, 'r');
$lines = '';
$current_line = 0;
while ($current_line < $number) {
$lines .= fgets($handle);
}
fclose($handle);
return $lines;
}
}