Initial code using Drupal 6.38
This commit is contained in:
commit
4824608a33
467 changed files with 90887 additions and 0 deletions
186
includes/cache.inc
Normal file
186
includes/cache.inc
Normal file
|
|
@ -0,0 +1,186 @@
|
|||
<?php
|
||||
|
||||
/**
|
||||
* Return data from the persistent cache. Data may be stored as either plain text or as serialized data.
|
||||
* cache_get will automatically return unserialized objects and arrays.
|
||||
*
|
||||
* @param $cid
|
||||
* The cache ID of the data to retrieve.
|
||||
* @param $table
|
||||
* The table $table to store the data in. Valid core values are 'cache_filter',
|
||||
* 'cache_menu', 'cache_page', or 'cache' for the default cache.
|
||||
*
|
||||
* @see cache_set()
|
||||
*/
|
||||
function cache_get($cid, $table = 'cache') {
|
||||
global $user;
|
||||
|
||||
// Garbage collection necessary when enforcing a minimum cache lifetime
|
||||
$cache_flush = variable_get('cache_flush_'. $table, 0);
|
||||
if ($cache_flush && ($cache_flush + variable_get('cache_lifetime', 0) <= time())) {
|
||||
// Reset the variable immediately to prevent a meltdown in heavy load situations.
|
||||
variable_set('cache_flush_'. $table, 0);
|
||||
// Time to flush old cache data
|
||||
db_query("DELETE FROM {". $table ."} WHERE expire != %d AND expire <= %d", CACHE_PERMANENT, $cache_flush);
|
||||
}
|
||||
|
||||
$cache = db_fetch_object(db_query("SELECT data, created, headers, expire, serialized FROM {". $table ."} WHERE cid = '%s'", $cid));
|
||||
if (isset($cache->data)) {
|
||||
// If the data is permanent or we're not enforcing a minimum cache lifetime
|
||||
// always return the cached data.
|
||||
if ($cache->expire == CACHE_PERMANENT || !variable_get('cache_lifetime', 0)) {
|
||||
$cache->data = db_decode_blob($cache->data);
|
||||
if ($cache->serialized) {
|
||||
$cache->data = unserialize($cache->data);
|
||||
}
|
||||
}
|
||||
// If enforcing a minimum cache lifetime, validate that the data is
|
||||
// currently valid for this user before we return it by making sure the
|
||||
// cache entry was created before the timestamp in the current session's
|
||||
// cache timer. The cache variable is loaded into the $user object by
|
||||
// sess_read() in session.inc.
|
||||
else {
|
||||
if (isset($user->cache) && $user->cache > $cache->created) {
|
||||
// This cache data is too old and thus not valid for us, ignore it.
|
||||
return 0;
|
||||
}
|
||||
else {
|
||||
$cache->data = db_decode_blob($cache->data);
|
||||
if ($cache->serialized) {
|
||||
$cache->data = unserialize($cache->data);
|
||||
}
|
||||
}
|
||||
}
|
||||
return $cache;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Store data in the persistent cache.
|
||||
*
|
||||
* The persistent cache is split up into four database
|
||||
* tables. Contributed modules can add additional tables.
|
||||
*
|
||||
* 'cache_page': This table stores generated pages for anonymous
|
||||
* users. This is the only table affected by the page cache setting on
|
||||
* the administrator panel.
|
||||
*
|
||||
* 'cache_menu': Stores the cachable part of the users' menus.
|
||||
*
|
||||
* 'cache_filter': Stores filtered pieces of content. This table is
|
||||
* periodically cleared of stale entries by cron.
|
||||
*
|
||||
* 'cache': Generic cache storage table.
|
||||
*
|
||||
* The reasons for having several tables are as follows:
|
||||
*
|
||||
* - smaller tables allow for faster selects and inserts
|
||||
* - we try to put fast changing cache items and rather static
|
||||
* ones into different tables. The effect is that only the fast
|
||||
* changing tables will need a lot of writes to disk. The more
|
||||
* static tables will also be better cachable with MySQL's query cache
|
||||
*
|
||||
* @param $cid
|
||||
* The cache ID of the data to store.
|
||||
* @param $data
|
||||
* The data to store in the cache. Complex data types will be automatically serialized before insertion.
|
||||
* Strings will be stored as plain text and not serialized.
|
||||
* @param $table
|
||||
* The table $table to store the data in. Valid core values are 'cache_filter',
|
||||
* 'cache_menu', 'cache_page', or 'cache'.
|
||||
* @param $expire
|
||||
* One of the following values:
|
||||
* - CACHE_PERMANENT: Indicates that the item should never be removed unless
|
||||
* explicitly told to using cache_clear_all() with a cache ID.
|
||||
* - CACHE_TEMPORARY: Indicates that the item should be removed at the next
|
||||
* general cache wipe.
|
||||
* - A Unix timestamp: Indicates that the item should be kept at least until
|
||||
* the given time, after which it behaves like CACHE_TEMPORARY.
|
||||
* @param $headers
|
||||
* A string containing HTTP header information for cached pages.
|
||||
*
|
||||
* @see cache_get()
|
||||
*/
|
||||
function cache_set($cid, $data, $table = 'cache', $expire = CACHE_PERMANENT, $headers = NULL) {
|
||||
$serialized = 0;
|
||||
if (is_object($data) || is_array($data)) {
|
||||
$data = serialize($data);
|
||||
$serialized = 1;
|
||||
}
|
||||
$created = time();
|
||||
db_query("UPDATE {". $table ."} SET data = %b, created = %d, expire = %d, headers = '%s', serialized = %d WHERE cid = '%s'", $data, $created, $expire, $headers, $serialized, $cid);
|
||||
if (!db_affected_rows()) {
|
||||
@db_query("INSERT INTO {". $table ."} (cid, data, created, expire, headers, serialized) VALUES ('%s', %b, %d, %d, '%s', %d)", $cid, $data, $created, $expire, $headers, $serialized);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* Expire data from the cache. If called without arguments, expirable
|
||||
* entries will be cleared from the cache_page and cache_block tables.
|
||||
*
|
||||
* @param $cid
|
||||
* If set, the cache ID to delete. Otherwise, all cache entries that can
|
||||
* expire are deleted.
|
||||
*
|
||||
* @param $table
|
||||
* If set, the table $table to delete from. Mandatory
|
||||
* argument if $cid is set.
|
||||
*
|
||||
* @param $wildcard
|
||||
* If $wildcard is TRUE, cache IDs starting with $cid are deleted in
|
||||
* addition to the exact cache ID specified by $cid. If $wildcard is
|
||||
* TRUE and $cid is '*' then the entire table $table is emptied.
|
||||
*/
|
||||
function cache_clear_all($cid = NULL, $table = NULL, $wildcard = FALSE) {
|
||||
global $user;
|
||||
|
||||
if (!isset($cid) && !isset($table)) {
|
||||
// Clear the block cache first, so stale data will
|
||||
// not end up in the page cache.
|
||||
cache_clear_all(NULL, 'cache_block');
|
||||
cache_clear_all(NULL, 'cache_page');
|
||||
return;
|
||||
}
|
||||
|
||||
if (empty($cid)) {
|
||||
if (variable_get('cache_lifetime', 0)) {
|
||||
// We store the time in the current user's $user->cache variable which
|
||||
// will be saved into the sessions table by sess_write(). We then
|
||||
// simulate that the cache was flushed for this user by not returning
|
||||
// cached data that was cached before the timestamp.
|
||||
$user->cache = time();
|
||||
|
||||
$cache_flush = variable_get('cache_flush_'. $table, 0);
|
||||
if ($cache_flush == 0) {
|
||||
// This is the first request to clear the cache, start a timer.
|
||||
variable_set('cache_flush_'. $table, time());
|
||||
}
|
||||
else if (time() > ($cache_flush + variable_get('cache_lifetime', 0))) {
|
||||
// Clear the cache for everyone, cache_lifetime seconds have
|
||||
// passed since the first request to clear the cache.
|
||||
db_query("DELETE FROM {". $table ."} WHERE expire != %d AND expire < %d", CACHE_PERMANENT, time());
|
||||
variable_set('cache_flush_'. $table, 0);
|
||||
}
|
||||
}
|
||||
else {
|
||||
// No minimum cache lifetime, flush all temporary cache entries now.
|
||||
db_query("DELETE FROM {". $table ."} WHERE expire != %d AND expire < %d", CACHE_PERMANENT, time());
|
||||
}
|
||||
}
|
||||
else {
|
||||
if ($wildcard) {
|
||||
if ($cid == '*') {
|
||||
db_query("TRUNCATE TABLE {". $table ."}");
|
||||
}
|
||||
else {
|
||||
db_query("DELETE FROM {". $table ."} WHERE cid LIKE '%s%%'", $cid);
|
||||
}
|
||||
}
|
||||
else {
|
||||
db_query("DELETE FROM {". $table ."} WHERE cid = '%s'", $cid);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in a new issue