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73b9b2535d35f902624663edb33254ad337cd5cb
gnu-social/classes/Notice.php
Evan Prodromou 577b54c2af blow last caches on notice delete 
We do some extra caching of streams, at ';last'. If a notice is
deleted, we need to blow those caches, too. So, this deletes them.

darcs-hash:20081124003240-84dde-aa4561e5e68b0ccc0598ac86294ea54f9be5775a.gz
2008-11-23 19:32:40 -05:00

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PHP
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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, Controlez-Vous, Inc.
*
* 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/>.
*/
if (!defined('LACONICA')) { exit(1); }
/**
* Table Definition for notice
*/
require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
/* We keep the first three 20-notice pages, plus one for pagination check,
* in the memcached cache. */
define('NOTICE_CACHE_WINDOW', 61);
class Notice extends Memcached_DataObject
{
###START_AUTOCODE
/* the code below is auto generated do not remove the above tag */
public $__table = 'notice'; // table name
public $id; // int(4) primary_key not_null
public $profile_id; // int(4) not_null
public $uri; // varchar(255) unique_key
public $content; // varchar(140)
public $rendered; // text()
public $url; // varchar(255)
public $created; // datetime() not_null
public $modified; // timestamp() not_null default_CURRENT_TIMESTAMP
public $reply_to; // int(4)
public $is_local; // tinyint(1)
public $source; // varchar(32)
/* Static get */
function staticGet($k,$v=NULL) { return Memcached_DataObject::staticGet('Notice',$k,$v); }
/* the code above is auto generated do not remove the tag below */
###END_AUTOCODE
function getProfile() {
return Profile::staticGet('id', $this->profile_id);
}
function delete() {
$this->blowCaches(true);
$this->blowFavesCache(true);
$this->blowInboxes();
parent::delete();
}
function saveTags() {
/* extract all #hastags */
$count = preg_match_all('/(?:^|\s)#([A-Za-z0-9_\-\.]{1,64})/', strtolower($this->content), $match);
if (!$count) {
return true;
}
/* elide characters we don't want in the tag */
$match[1] = str_replace(array('-', '_', '.'), '', $match[1]);
/* Add them to the database */
foreach(array_unique($match[1]) as $hashtag) {
$tag = DB_DataObject::factory('Notice_tag');
$tag->notice_id = $this->id;
$tag->tag = $hashtag;
$tag->created = $this->created;
$id = $tag->insert();
if (!$id) {
$last_error = PEAR::getStaticProperty('DB_DataObject','lastError');
common_log(LOG_ERR, 'DB error inserting hashtag: ' . $last_error->message);
common_server_error(sprintf(_('DB error inserting hashtag: %s'), $last_error->message));
return;
}
}
return true;
}
static function saveNew($profile_id, $content, $source=NULL, $is_local=1, $reply_to=NULL, $uri=NULL) {
$notice = new Notice();
$notice->profile_id = $profile_id;
$notice->is_local = $is_local;
$notice->reply_to = $reply_to;
$notice->created = common_sql_now();
$notice->content = $content;
$notice->rendered = common_render_content($notice->content, $notice);
$notice->source = $source;
$notice->uri = $uri;
$id = $notice->insert();
if (!$id) {
common_log_db_error($notice, 'INSERT', __FILE__);
return _('Problem saving notice.');
}
# Update the URI after the notice is in the database
if (!$uri) {
$orig = clone($notice);
$notice->uri = common_notice_uri($notice);
if (!$notice->update($orig)) {
common_log_db_error($notice, 'UPDATE', __FILE__);
return _('Problem saving notice.');
}
}
# XXX: do we need to change this for remote users?
common_save_replies($notice);
$notice->saveTags();
# Clear the cache for subscribed users, so they'll update at next request
# XXX: someone clever could prepend instead of clearing the cache
if (common_config('memcached', 'enabled')) {
$notice->blowCaches();
}
$notice->addToInboxes();
return $notice;
}
function blowCaches($blowLast=false) {
$this->blowSubsCache($blowLast);
$this->blowNoticeCache($blowLast);
$this->blowRepliesCache($blowLast);
$this->blowPublicCache($blowLast);
$this->blowTagCache($blowLast);
}
function blowTagCache($blowLast=false) {
$cache = common_memcache();
if ($cache) {
$tag = new Notice_tag();
$tag->notice_id = $this->id;
if ($tag->find()) {
while ($tag->fetch()) {
$cache->delete(common_cache_key('notice_tag:notice_stream:' . $tag->tag));
if ($blowLast) {
$cache->delete(common_cache_key('notice_tag:notice_stream:' . $tag->tag . ';last'));
}
}
}
$tag->free();
unset($tag);
}
}
function blowSubsCache($blowLast=false) {
$cache = common_memcache();
if ($cache) {
$user = new User();
$user->query('SELECT id ' .
'FROM user JOIN subscription ON user.id = subscription.subscriber ' .
'WHERE subscription.subscribed = ' . $this->profile_id);
while ($user->fetch()) {
$cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
if ($blowLast) {
$cache->delete(common_cache_key('user:notices_with_friends:' . $user->id . ';last'));
}
}
$user->free();
unset($user);
}
}
function blowNoticeCache($blowLast=false) {
if ($this->is_local) {
$cache = common_memcache();
if ($cache) {
$cache->delete(common_cache_key('user:notices:'.$this->profile_id));
if ($blowLast) {
$cache->delete(common_cache_key('user:notices:'.$this->profile_id.';last'));
}
}
}
}
function blowRepliesCache($blowLast=false) {
$cache = common_memcache();
if ($cache) {
$reply = new Reply();
$reply->notice_id = $this->id;
if ($reply->find()) {
while ($reply->fetch()) {
$cache->delete(common_cache_key('user:replies:'.$reply->profile_id));
if ($blowLast) {
$cache->delete(common_cache_key('user:replies:'.$reply->profile_id.';last'));
}
}
}
$reply->free();
unset($reply);
}
}
function blowPublicCache($blowLast=false) {
if ($this->is_local) {
$cache = common_memcache();
if ($cache) {
$cache->delete(common_cache_key('public'));
if ($blowLast) {
$cache->delete(common_cache_key('public').';last');
}
}
}
}
function blowFavesCache($blowLast=false) {
$cache = common_memcache();
if ($cache) {
$fave = new Fave();
$fave->notice_id = $this->id;
if ($fave->find()) {
while ($fave->fetch()) {
$cache->delete(common_cache_key('user:faves:'.$fave->user_id));
if ($blowLast) {
$cache->delete(common_cache_key('user:faves:'.$fave->user_id.';last'));
}
}
}
$fave->free();
unset($fave);
}
}
# XXX: too many args; we need to move to named params or even a separate
# class for notice streams
static function getStream($qry, $cachekey, $offset=0, $limit=20, $since_id=0, $before_id=0, $order=NULL) {
if (common_config('memcached', 'enabled')) {
# Skip the cache if this is a since_id or before_id qry
if ($since_id > 0 || $before_id > 0) {
return Notice::getStreamDirect($qry, $offset, $limit, $since_id, $before_id, $order);
} else {
return Notice::getCachedStream($qry, $cachekey, $offset, $limit, $order);
}
}
return Notice::getStreamDirect($qry, $offset, $limit, $since_id, $before_id, $order);
}
static function getStreamDirect($qry, $offset, $limit, $since_id, $before_id, $order) {
$needAnd = FALSE;
$needWhere = TRUE;
if (preg_match('/\bWHERE\b/i', $qry)) {
$needWhere = FALSE;
$needAnd = TRUE;
}
if ($since_id > 0) {
if ($needWhere) {
$qry .= ' WHERE ';
$needWhere = FALSE;
} else {
$qry .= ' AND ';
}
$qry .= ' notice.id > ' . $since_id;
}
if ($before_id > 0) {
if ($needWhere) {
$qry .= ' WHERE ';
$needWhere = FALSE;
} else {
$qry .= ' AND ';
}
$qry .= ' notice.id < ' . $before_id;
}
# Allow ORDER override
if ($order) {
$qry .= $order;
} else {
$qry .= ' ORDER BY notice.created DESC, notice.id DESC ';
}
if (common_config('db','type') == 'pgsql') {
$qry .= ' LIMIT ' . $limit . ' OFFSET ' . $offset;
} else {
$qry .= ' LIMIT ' . $offset . ', ' . $limit;
}
$notice = new Notice();
$notice->query($qry);
return $notice;
}
# XXX: this is pretty long and should probably be broken up into
# some helper functions
static function getCachedStream($qry, $cachekey, $offset, $limit, $order) {
# If outside our cache window, just go to the DB
if ($offset + $limit > NOTICE_CACHE_WINDOW) {
return Notice::getStreamDirect($qry, $offset, $limit, NULL, NULL, $order);
}
# Get the cache; if we can't, just go to the DB
$cache = common_memcache();
if (!$cache) {
return Notice::getStreamDirect($qry, $offset, $limit, NULL, NULL, $order);
}
# Get the notices out of the cache
$notices = $cache->get(common_cache_key($cachekey));
# On a cache hit, return a DB-object-like wrapper
if ($notices !== FALSE) {
$wrapper = new NoticeWrapper(array_slice($notices, $offset, $limit));
return $wrapper;
}
# If the cache was invalidated because of new data being
# added, we can try and just get the new stuff. We keep an additional
# copy of the data at the key + ';last'
# No cache hit. Try to get the *last* cached version
$last_notices = $cache->get(common_cache_key($cachekey) . ';last');
if ($last_notices) {
# Reverse-chron order, so last ID is last.
$last_id = $last_notices[0]->id;
# XXX: this assumes monotonically increasing IDs; a fair
# bet with our DB.
$new_notice = Notice::getStreamDirect($qry, 0, NOTICE_CACHE_WINDOW,
$last_id, NULL, $order);
if ($new_notice) {
$new_notices = array();
while ($new_notice->fetch()) {
$new_notices[] = clone($new_notice);
}
$new_notice->free();
$notices = array_slice(array_merge($new_notices, $last_notices),
0, NOTICE_CACHE_WINDOW);
# Store the array in the cache for next time
$result = $cache->set(common_cache_key($cachekey), $notices);
$result = $cache->set(common_cache_key($cachekey) . ';last', $notices);
# return a wrapper of the array for use now
return new NoticeWrapper(array_slice($notices, $offset, $limit));
}
}
# Otherwise, get the full cache window out of the DB
$notice = Notice::getStreamDirect($qry, 0, NOTICE_CACHE_WINDOW, NULL, NULL, $order);
# If there are no hits, just return the value
if (!$notice) {
return $notice;
}
# Pack results into an array
$notices = array();
while ($notice->fetch()) {
$notices[] = clone($notice);
}
$notice->free();
# Store the array in the cache for next time
$result = $cache->set(common_cache_key($cachekey), $notices);
$result = $cache->set(common_cache_key($cachekey) . ';last', $notices);
# return a wrapper of the array for use now
$wrapper = new NoticeWrapper(array_slice($notices, $offset, $limit));
return $wrapper;
}
function publicStream($offset=0, $limit=20, $since_id=0, $before_id=0) {
$parts = array();
$qry = 'SELECT * FROM notice ';
if (common_config('public', 'localonly')) {
$parts[] = 'is_local = 1';
}
if (common_config('public', 'blacklist')) {
$parts[] = 'profile_id not in (' . implode(',', common_config('public', 'blacklist')) . ')';
}
if ($parts) {
$qry .= ' WHERE ' . implode(' AND ', $parts);
}
return Notice::getStream($qry,
'public',
$offset, $limit, $since_id, $before_id);
}
function addToInboxes() {
$enabled = common_config('inboxes', 'enabled');
if ($enabled === true || $enabled === 'transitional') {
$inbox = new Notice_inbox();
$qry = 'INSERT INTO notice_inbox (user_id, notice_id, created) ' .
'SELECT user.id, ' . $this->id . ', "' . $this->created . '" ' .
'FROM user JOIN subscription ON user.id = subscription.subscriber ' .
'WHERE subscription.subscribed = ' . $this->profile_id . ' ' .
'AND NOT EXISTS (SELECT user_id, notice_id ' .
'FROM notice_inbox ' .
'WHERE user_id = user.id ' .
'AND notice_id = ' . $this->id . ' )';
if ($enabled === 'transitional') {
$qry .= ' AND user.inboxed = 1';
}
$inbox->query($qry);
}
return;
}
# Delete from inboxes if we're deleted.
function blowInboxes() {
$enabled = common_config('inboxes', 'enabled');
if ($enabled === true || $enabled === 'transitional') {
$inbox = new Notice_inbox();
$inbox->notice_id = $this->id;
$inbox->delete();
}
return;
}
}
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