1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
* @author Daniel Jagszent <daniel@jagszent.de>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <robin@icewind.nl>
* @author Roeland Jago Douma <roeland@famdouma.nl>
* @author Vincent Petry <vincent@nextcloud.com>
*
* @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 OC\Files\Cache;
use OCP\Files\Cache\ICacheEntry;
use OCP\Files\Cache\IWatcher;
/**
* check the storage backends for updates and change the cache accordingly
*/
class Watcher implements IWatcher {
protected $watchPolicy = self::CHECK_ONCE;
protected $checkedPaths = [];
/**
* @var \OC\Files\Storage\Storage $storage
*/
protected $storage;
/**
* @var Cache $cache
*/
protected $cache;
/**
* @var Scanner $scanner ;
*/
protected $scanner;
/**
* @param \OC\Files\Storage\Storage $storage
*/
public function __construct(\OC\Files\Storage\Storage $storage) {
$this->storage = $storage;
$this->cache = $storage->getCache();
$this->scanner = $storage->getScanner();
}
/**
* @param int $policy either \OC\Files\Cache\Watcher::CHECK_NEVER, \OC\Files\Cache\Watcher::CHECK_ONCE, \OC\Files\Cache\Watcher::CHECK_ALWAYS
*/
public function setPolicy($policy) {
$this->watchPolicy = $policy;
}
/**
* @return int either \OC\Files\Cache\Watcher::CHECK_NEVER, \OC\Files\Cache\Watcher::CHECK_ONCE, \OC\Files\Cache\Watcher::CHECK_ALWAYS
*/
public function getPolicy() {
return $this->watchPolicy;
}
/**
* check $path for updates and update if needed
*
* @param string $path
* @param ICacheEntry|null $cachedEntry
* @return boolean true if path was updated
*/
public function checkUpdate($path, $cachedEntry = null) {
if (is_null($cachedEntry)) {
$cachedEntry = $this->cache->get($path);
}
if ($cachedEntry === false || $this->needsUpdate($path, $cachedEntry)) {
$this->update($path, $cachedEntry);
if ($cachedEntry === false) {
return true;
} else {
// storage backends can sometimes return false positives, only return true if the scanner actually found a change
$newEntry = $this->cache->get($path);
return $newEntry->getStorageMTime() > $cachedEntry->getStorageMTime();
}
} else {
return false;
}
}
/**
* Update the cache for changes to $path
*
* @param string $path
* @param ICacheEntry $cachedData
*/
public function update($path, $cachedData) {
if ($this->storage->is_dir($path)) {
$this->scanner->scan($path, Scanner::SCAN_SHALLOW);
} else {
$this->scanner->scanFile($path);
}
if (is_array($cachedData) && $cachedData['mimetype'] === 'httpd/unix-directory') {
$this->cleanFolder($path);
}
if ($this->cache instanceof Cache) {
$this->cache->correctFolderSize($path);
}
}
/**
* Check if the cache for $path needs to be updated
*
* @param string $path
* @param ICacheEntry $cachedData
* @return bool
*/
public function needsUpdate($path, $cachedData) {
if ($this->watchPolicy === self::CHECK_ALWAYS or ($this->watchPolicy === self::CHECK_ONCE and !in_array($path, $this->checkedPaths))) {
$this->checkedPaths[] = $path;
return $this->storage->hasUpdated($path, $cachedData['storage_mtime']);
}
return false;
}
/**
* remove deleted files in $path from the cache
*
* @param string $path
*/
public function cleanFolder($path) {
$cachedContent = $this->cache->getFolderContents($path);
foreach ($cachedContent as $entry) {
if (!$this->storage->file_exists($entry['path'])) {
$this->cache->remove($entry['path']);
}
}
}
}
|
