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-rw-r--r--application/Cache.php38
-rw-r--r--application/CachedPage.php63
-rw-r--r--application/LinkDB.php7
3 files changed, 105 insertions, 3 deletions
diff --git a/application/Cache.php b/application/Cache.php
new file mode 100644
index 00000000..5d050165
--- /dev/null
+++ b/application/Cache.php
@@ -0,0 +1,38 @@
1<?php
2/**
3 * Cache utilities
4 */
5
6/**
7 * Purges all cached pages
8 *
9 * @param string $pageCacheDir page cache directory
10 *
11 * @return mixed an error string if the directory is missing
12 */
13function purgeCachedPages($pageCacheDir)
14{
15 if (! is_dir($pageCacheDir)) {
16 $error = 'Cannot purge '.$pageCacheDir.': no directory';
17 error_log($error);
18 return $error;
19 }
20
21 array_map('unlink', glob($pageCacheDir.'/*.cache'));
22}
23
24/**
25 * Invalidates caches when the database is changed or the user logs out.
26 *
27 * @param string $pageCacheDir page cache directory
28 */
29function invalidateCaches($pageCacheDir)
30{
31 // Purge cache attached to session.
32 if (isset($_SESSION['tags'])) {
33 unset($_SESSION['tags']);
34 }
35
36 // Purge page cache shared by sessions.
37 purgeCachedPages($pageCacheDir);
38}
diff --git a/application/CachedPage.php b/application/CachedPage.php
new file mode 100644
index 00000000..50cfa9ac
--- /dev/null
+++ b/application/CachedPage.php
@@ -0,0 +1,63 @@
1<?php
2/**
3 * Simple cache system, mainly for the RSS/ATOM feeds
4 */
5class CachedPage
6{
7 // Directory containing page caches
8 private $cacheDir;
9
10 // Full URL of the page to cache -typically the value returned by pageUrl()
11 private $url;
12
13 // Should this URL be cached (boolean)?
14 private $shouldBeCached;
15
16 // Name of the cache file for this URL
17 private $filename;
18
19 /**
20 * Creates a new CachedPage
21 *
22 * @param string $cacheDir page cache directory
23 * @param string $url page URL
24 * @param bool $shouldBeCached whether this page needs to be cached
25 */
26 public function __construct($cacheDir, $url, $shouldBeCached)
27 {
28 // TODO: check write access to the cache directory
29 $this->cacheDir = $cacheDir;
30 $this->url = $url;
31 $this->filename = $this->cacheDir.'/'.sha1($url).'.cache';
32 $this->shouldBeCached = $shouldBeCached;
33 }
34
35 /**
36 * Returns the cached version of a page, if it exists and should be cached
37 *
38 * @return a cached version of the page if it exists, null otherwise
39 */
40 public function cachedVersion()
41 {
42 if (!$this->shouldBeCached) {
43 return null;
44 }
45 if (is_file($this->filename)) {
46 return file_get_contents($this->filename);
47 }
48 return null;
49 }
50
51 /**
52 * Puts a page in the cache
53 *
54 * @param string $pageContent XML content to cache
55 */
56 public function cache($pageContent)
57 {
58 if (!$this->shouldBeCached) {
59 return;
60 }
61 file_put_contents($this->filename, $pageContent);
62 }
63}
diff --git a/application/LinkDB.php b/application/LinkDB.php
index 1e16fef1..463aa47e 100644
--- a/application/LinkDB.php
+++ b/application/LinkDB.php
@@ -269,8 +269,10 @@ You use the community supported version of the original Shaarli project, by Seba
269 269
270 /** 270 /**
271 * Saves the database from memory to disk 271 * Saves the database from memory to disk
272 *
273 * @param string $pageCacheDir page cache directory
272 */ 274 */
273 public function savedb() 275 public function savedb($pageCacheDir)
274 { 276 {
275 if (!$this->_loggedIn) { 277 if (!$this->_loggedIn) {
276 // TODO: raise an Exception instead 278 // TODO: raise an Exception instead
@@ -280,7 +282,7 @@ You use the community supported version of the original Shaarli project, by Seba
280 $this->_datastore, 282 $this->_datastore,
281 self::$phpPrefix.base64_encode(gzdeflate(serialize($this->_links))).self::$phpSuffix 283 self::$phpPrefix.base64_encode(gzdeflate(serialize($this->_links))).self::$phpSuffix
282 ); 284 );
283 invalidateCaches(); 285 invalidateCaches($pageCacheDir);
284 } 286 }
285 287
286 /** 288 /**
@@ -439,4 +441,3 @@ You use the community supported version of the original Shaarli project, by Seba
439 return $linkDays; 441 return $linkDays;
440 } 442 }
441} 443}
442?>