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-rw-r--r--plugins/DiskCachePlugin.php168
1 files changed, 168 insertions, 0 deletions
diff --git a/plugins/DiskCachePlugin.php b/plugins/DiskCachePlugin.php
new file mode 100644
index 000000000..b709ea3b3
--- /dev/null
+++ b/plugins/DiskCachePlugin.php
@@ -0,0 +1,168 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2009, StatusNet, Inc.
+ *
+ * Plugin to implement cache interface with disk files
+ *
+ * PHP version 5
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Cache
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2009 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+ // This check helps protect against security problems;
+ // your code file can't be executed directly from the web.
+ exit(1);
+}
+
+/**
+ * A plugin to cache data on local disk
+ *
+ * @category Cache
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2009 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+class DiskCachePlugin extends Plugin
+{
+ var $root = '/tmp';
+
+ function keyToFilename($key)
+ {
+ return $this->root . '/' . str_replace(':', '/', $key);
+ }
+
+ /**
+ * Get a value associated with a key
+ *
+ * The value should have been set previously.
+ *
+ * @param string &$key in; Lookup key
+ * @param mixed &$value out; value associated with key
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheGet(&$key, &$value)
+ {
+ $filename = $this->keyToFilename($key);
+
+ if (file_exists($filename)) {
+ $data = file_get_contents($filename);
+ if ($data !== false) {
+ $value = unserialize($data);
+ }
+ }
+
+ Event::handle('EndCacheGet', array($key, &$value));
+ return false;
+ }
+
+ /**
+ * Associate a value with a key
+ *
+ * @param string &$key in; Key to use for lookups
+ * @param mixed &$value in; Value to associate
+ * @param integer &$flag in; Flag (passed through to Memcache)
+ * @param integer &$expiry in; Expiry (passed through to Memcache)
+ * @param boolean &$success out; Whether the set was successful
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
+ {
+ $filename = $this->keyToFilename($key);
+ $parent = dirname($filename);
+
+ $sofar = '';
+
+ foreach (explode('/', $parent) as $part) {
+ if (empty($part)) {
+ continue;
+ }
+ $sofar .= '/' . $part;
+ if (!is_dir($sofar)) {
+ $this->debug("Creating new directory '$sofar'");
+ $success = mkdir($sofar, 0750);
+ if (!$success) {
+ $this->log(LOG_ERR, "Can't create directory '$sofar'");
+ return false;
+ }
+ }
+ }
+
+ if (is_dir($filename)) {
+ $success = false;
+ return false;
+ }
+
+ // Write to a temp file and move to destination
+
+ $tempname = tempnam(null, 'statusnetdiskcache');
+
+ $result = file_put_contents($tempname, serialize($value));
+
+ if ($result === false) {
+ $this->log(LOG_ERR, "Couldn't write '$key' to temp file '$tempname'");
+ return false;
+ }
+
+ $result = rename($tempname, $filename);
+
+ if (!$result) {
+ $this->log(LOG_ERR, "Couldn't move temp file '$tempname' to path '$filename' for key '$key'");
+ @unlink($tempname);
+ return false;
+ }
+
+ Event::handle('EndCacheSet', array($key, $value, $flag,
+ $expiry));
+
+ return false;
+ }
+
+ /**
+ * Delete a value associated with a key
+ *
+ * @param string &$key in; Key to lookup
+ * @param boolean &$success out; whether it worked
+ *
+ * @return boolean hook success
+ */
+
+ function onStartCacheDelete(&$key, &$success)
+ {
+ $filename = $this->keyToFilename($key);
+
+ if (file_exists($filename) && !is_dir($filename)) {
+ unlink($filename);
+ }
+
+ Event::handle('EndCacheDelete', array($key));
+ return false;
+ }
+}
+