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