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<?php
/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
namespace Icinga\Protocol\File;
use Icinga\Exception\IcingaException;
use SplFileObject;
use Iterator;
/**
* Iterate over a log file, yielding the regex fields of the log messages
*/
class LogFileIterator implements Iterator
{
/**
* Log file
*
* @var SplFileObject
*/
protected $file;
/**
* A PCRE string with the fields to extract
* from the log messages as named subpatterns
*
* @var string
*/
protected $fields;
/**
* Value for static::current()
*
* @var array
*/
protected $current;
/**
* Index for static::key()
*
* @var int
*/
protected $index;
/**
* Value for static::valid()
*
* @var boolean
*/
protected $valid;
/**
* @var string
*/
protected $next = null;
/**
* @param string $filename The log file's name
* @param string $fields A PCRE string with the fields to extract
* from the log messages as named subpatterns
*/
public function __construct($filename, $fields)
{
$this->file = new SplFileObject($filename);
$this->file->setFlags(
SplFileObject::DROP_NEW_LINE |
SplFileObject::READ_AHEAD
);
$this->fields = $fields;
}
public function rewind(): void
{
$this->file->rewind();
$this->index = 0;
$this->nextMessage();
}
public function next(): void
{
$this->file->next();
++$this->index;
$this->nextMessage();
}
public function current(): array
{
return $this->current;
}
public function key(): int
{
return $this->index;
}
public function valid(): bool
{
return $this->valid;
}
protected function nextMessage()
{
$message = $this->next === null ? array() : array($this->next);
$this->valid = null;
while ($this->file->valid()) {
if (false === ($res = preg_match(
$this->fields,
$current = $this->file->current()
))) {
throw new IcingaException('Failed at preg_match()');
}
if (empty($message)) {
if ($res === 1) {
$message[] = $current;
}
} elseif ($res === 1) {
$this->next = $current;
$this->valid = true;
break;
} else {
$message[] = $current;
}
$this->file->next();
}
if ($this->valid === null) {
$this->next = null;
$this->valid = ! empty($message);
}
if ($this->valid) {
while (! empty($message)) {
$matches = array();
if (false === ($res = preg_match(
$this->fields,
implode(PHP_EOL, $message),
$matches
))) {
throw new IcingaException('Failed at preg_match()');
}
if ($res === 1) {
$this->current = $matches;
return;
}
array_pop($message);
}
$this->valid = false;
}
}
}
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