classes/Notice.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 if (!defined('LACONICA')) { exit(1); }
  21
  22 /**
  23  * Table Definition for notice
  24  */
  25 require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
  26
  27 /* We keep the first three 20-notice pages, plus one for pagination check,
  28  * in the memcached cache. */
  29
  30 define('NOTICE_CACHE_WINDOW', 61);
  31
  32 class Notice extends Memcached_DataObject
  33 {
  34     ###START_AUTOCODE
  35     /* the code below is auto generated do not remove the above tag */
  36
  37     public $__table = 'notice';                          // table name
  38     public $id;                              // int(4)  primary_key not_null
  39     public $profile_id;                      // int(4)   not_null
  40     public $uri;                             // varchar(255)  unique_key
  41     public $content;                         // varchar(140)
  42     public $rendered;                        // text()
  43     public $url;                             // varchar(255)
  44     public $created;                         // datetime()   not_null
  45     public $modified;                        // timestamp()   not_null default_CURRENT_TIMESTAMP
  46     public $reply_to;                        // int(4)
  47     public $is_local;                        // tinyint(1)
  48     public $source;                          // varchar(32)
  49
  50     /* Static get */
  51     function staticGet($k,$v=NULL) { return Memcached_DataObject::staticGet('Notice',$k,$v); }
  52
  53     /* the code above is auto generated do not remove the tag below */
  54     ###END_AUTOCODE
  55
  56         function getProfile() {
  57                 return Profile::staticGet('id', $this->profile_id);
  58         }
  59
  60         function delete() {
  61                 $this->blowCaches();
  62                 $this->blowFavesCache();
  63                 parent::delete();
  64         }
  65
  66         function saveTags() {
  67                 /* extract all #hastags */
  68                 $count = preg_match_all('/(?:^|\s)#([A-Za-z0-9_\-\.]{1,64})/', strtolower($this->content), $match);
  69                 if (!$count) {
  70                         return true;
  71                 }
  72
  73                 /* elide characters we don't want in the tag */
  74                 $match[1] = str_replace(array('-', '_', '.'), '', $match[1]);
  75
  76                 /* Add them to the database */
  77                 foreach(array_unique($match[1]) as $hashtag) {
  78                         $tag = DB_DataObject::factory('Notice_tag');
  79                         $tag->notice_id = $this->id;
  80                         $tag->tag = $hashtag;
  81                         $tag->created = $this->created;
  82                         $id = $tag->insert();
  83                         if (!$id) {
  84                                 $last_error = PEAR::getStaticProperty('DB_DataObject','lastError');
  85                                 common_log(LOG_ERR, 'DB error inserting hashtag: ' . $last_error->message);
  86                                 common_server_error(sprintf(_('DB error inserting hashtag: %s'), $last_error->message));
  87                                 return;
  88                         }
  89                 }
  90                 return true;
  91         }
  92
  93         static function saveNew($profile_id, $content, $source=NULL, $is_local=1, $reply_to=NULL, $uri=NULL) {
  94
  95                 $notice = new Notice();
  96                 $notice->profile_id = $profile_id;
  97                 $notice->is_local = $is_local;
  98                 $notice->reply_to = $reply_to;
  99                 $notice->created = common_sql_now();
 100                 $notice->content = $content;
 101                 $notice->rendered = common_render_content($notice->content, $notice);
 102                 $notice->source = $source;
 103                 $notice->uri = $uri;
 104
 105                 $id = $notice->insert();
 106
 107                 if (!$id) {
 108                         common_log_db_error($notice, 'INSERT', __FILE__);
 109                         return _('Problem saving notice.');
 110                 }
 111
 112                 # Update the URI after the notice is in the database
 113                 if (!$uri) {
 114                         $orig = clone($notice);
 115                         $notice->uri = common_notice_uri($notice);
 116
 117                         if (!$notice->update($orig)) {
 118                                 common_log_db_error($notice, 'UPDATE', __FILE__);
 119                                 return _('Problem saving notice.');
 120                         }
 121                 }
 122
 123                 # XXX: do we need to change this for remote users?
 124
 125                 common_save_replies($notice);
 126                 $notice->saveTags();
 127
 128                 # Clear the cache for subscribed users, so they'll update at next request
 129                 # XXX: someone clever could prepend instead of clearing the cache
 130
 131                 if (common_config('memcached', 'enabled')) {
 132                         $notice->blowCaches();
 133                 }
 134
 135                 return $notice;
 136         }
 137
 138         function blowCaches() {
 139                 $this->blowSubsCache();
 140                 $this->blowNoticeCache();
 141                 $this->blowRepliesCache();
 142                 $this->blowPublicCache();
 143                 $this->blowTagCache();
 144         }
 145
 146         function blowTagCache() {
 147                 $cache = common_memcache();
 148                 if ($cache) {
 149                         $tag = new Notice_tag();
 150                         $tag->notice_id = $this->id;
 151                         if ($tag->find()) {
 152                                 while ($tag->fetch()) {
 153                                         $cache->delete(common_cache_key('notice_tag:notice_stream:' . $tag->tag));
 154                                 }
 155                         }
 156                         $tag->free();
 157                         unset($tag);
 158                 }
 159         }
 160
 161         function blowSubsCache() {
 162                 $cache = common_memcache();
 163                 if ($cache) {
 164                         $user = new User();
 165
 166                         $user->query('SELECT id ' .
 167                                                  'FROM user JOIN subscription ON user.id = subscription.subscriber ' .
 168                                                  'WHERE subscription.subscribed = ' . $this->profile_id);
 169
 170                         while ($user->fetch()) {
 171                                 $cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
 172                         }
 173
 174                         $user->free();
 175                         unset($user);
 176                 }
 177         }
 178
 179         function blowNoticeCache() {
 180                 if ($this->is_local) {
 181                         $cache = common_memcache();
 182                         if ($cache) {
 183                                 $cache->delete(common_cache_key('user:notices:'.$this->profile_id));
 184                         }
 185                 }
 186         }
 187
 188         function blowRepliesCache() {
 189                 $cache = common_memcache();
 190                 if ($cache) {
 191                         $reply = new Reply();
 192                         $reply->notice_id = $this->id;
 193                         if ($reply->find()) {
 194                                 while ($reply->fetch()) {
 195                                         $cache->delete(common_cache_key('user:replies:'.$reply->profile_id));
 196                                 }
 197                         }
 198                         $reply->free();
 199                         unset($reply);
 200                 }
 201         }
 202
 203         function blowPublicCache() {
 204                 if ($this->is_local) {
 205                         $cache = common_memcache();
 206                         if ($cache) {
 207                                 $cache->delete(common_cache_key('public'));
 208                         }
 209                 }
 210         }
 211
 212         function blowFavesCache() {
 213                 $cache = common_memcache();
 214                 if ($cache) {
 215                         $fave = new Fave();
 216                         $fave->notice_id = $this->id;
 217                         if ($fave->find()) {
 218                                 while ($fave->fetch()) {
 219                                         $cache->delete(common_cache_key('user:faves:'.$fave->user_id));
 220                                 }
 221                         }
 222                         $fave->free();
 223                         unset($fave);
 224                 }
 225         }
 226
 227         static function getStream($qry, $cachekey, $offset=0, $limit=20) {
 228
 229                 if (common_config('memcached', 'enabled')) {
 230                         return Notice::getCachedStream($qry, $cachekey, $offset, $limit);
 231                 } else {
 232                         return Notice::getStreamDirect($qry, $offset, $limit);
 233                 }
 234
 235         }
 236
 237         static function getStreamDirect($qry, $offset, $limit) {
 238
 239                 $qry .= ' ORDER BY notice.created DESC, notice.id DESC ';
 240
 241                 if(common_config('db','type')=='pgsql') {
 242                         $qry .= ' LIMIT ' . $limit . ' OFFSET ' . $offset;
 243                 } else {
 244                         $qry .= ' LIMIT ' . $offset . ', ' . $limit;
 245                 }
 246
 247                 $notice = new Notice();
 248
 249                 $notice->query($qry);
 250
 251                 return $notice;
 252         }
 253
 254         static function getCachedStream($qry, $cachekey, $offset, $limit) {
 255
 256                 # If outside our cache window, just go to the DB
 257
 258                 if ($offset + $limit > NOTICE_CACHE_WINDOW) {
 259                         return Notice::getStreamDirect($qry, $offset, $limit);
 260                 }
 261
 262                 # Get the cache; if we can't, just go to the DB
 263
 264                 $cache = common_memcache();
 265
 266
 267                 if (!$cache) {
 268                         return Notice::getStreamDirect($qry, $offset, $limit);
 269                 }
 270
 271                 # Get the notices out of the cache
 272
 273                 $notices = $cache->get(common_cache_key($cachekey));
 274
 275                 # On a cache hit, return a DB-object-like wrapper
 276
 277                 if ($notices !== FALSE) {
 278                         $wrapper = new NoticeWrapper(array_slice($notices, $offset, $limit));
 279                         return $wrapper;
 280                 }
 281
 282                 # Otherwise, get the full cache window out of the DB
 283
 284                 $notice = Notice::getStreamDirect($qry, 0, NOTICE_CACHE_WINDOW);
 285
 286                 # If there are no hits, just return the value
 287
 288                 if (!$notice) {
 289                         return $notice;
 290                 }
 291
 292                 # Pack results into an array
 293
 294                 $notices = array();
 295
 296                 while ($notice->fetch()) {
 297                         $notices[] = clone($notice);
 298                 }
 299
 300                 # Store the array in the cache for next time
 301
 302                 $result = $cache->set(common_cache_key($cachekey), $notices);
 303
 304                 # return a wrapper of the array for use now
 305
 306                 $wrapper = new NoticeWrapper(array_slice($notices, $offset, $limit));
 307
 308                 return $wrapper;
 309         }
 310
 311         function publicStream($offset=0, $limit=20) {
 312
 313                 $qry = 'SELECT * FROM notice ';
 314
 315                 if (common_config('public', 'localonly')) {
 316                         $qry .= ' WHERE is_local = 1 ';
 317                 }
 318
 319                 return Notice::getStream($qry,
 320                                                                  'public',
 321                                                                  $offset, $limit);
 322         }
 323 }