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<?php
/**
* @author Robin Appelman <icewind@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\LogReader\Log;
class LogIterator implements \Iterator {
/**
* @var resource
*/
private $handle;
/**
* @var int
*/
private $position = 0;
/**
* @var string
*/
private $lastLine;
/**
* @var string
*/
private $currentLine = '';
private $currentKey = -1;
/**
* @var string
*/
private $dateFormat;
const CHUNK_SIZE = 100; // how many chars do we try at once to find a new line
/**
* @param resource $handle
* @param string $dateFormat
*/
public function __construct($handle, $dateFormat) {
$this->handle = $handle;
$this->dateFormat = $dateFormat;
$this->rewind();
$this->next();
}
function rewind() {
fseek($this->handle, 0, SEEK_END);
$this->position = ftell($this->handle) - self::CHUNK_SIZE;
$this->currentKey = 0;
}
function current() {
$entry = json_decode($this->lastLine, true);
if ($this->dateFormat !== \DateTime::ATOM) {
$time = \DateTime::createFromFormat($this->dateFormat, $entry['time']);
if ($time) {
$entry['time'] = $time->format(\DateTime::ATOM);
}
}
return $entry;
}
function key() {
return $this->currentKey;
}
function next() {
// Loop through each character of the file looking for new lines
while ($this->position >= 0) {
fseek($this->handle, $this->position);
$chars = fread($this->handle, self::CHUNK_SIZE);
$newlinePos = strrpos($chars, "\n");
if ($newlinePos !== false) {
$this->currentLine = substr($chars, $newlinePos + 1) . $this->currentLine;
$this->lastLine = $this->currentLine;
$this->currentKey++;
$this->currentLine = '';
$this->position -= (self::CHUNK_SIZE - $newlinePos);
return;
} else {
$this->currentLine = $chars . $this->currentLine;
$this->position -= self::CHUNK_SIZE;
}
}
}
function valid() {
return $this->position >= 0 && is_resource($this->handle);
}
}
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