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annotate forums/latest.py @ 1168:90e8cc6eff77

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Fix ambiguous date errors in forum feeds.
author Brian Neal <bgneal@gmail.com>
date Sun, 05 Nov 2017 14:59:26 -0600
parents 7429c98c8ece
children e9f6a2c5c1de
rev   line source
bgneal@509 1 """
bgneal@509 2 This module maintains the latest posts datastore. The latest posts are often
bgneal@509 3 needed by RSS feeds, "latest posts" template tags, etc. This module listens for
bgneal@509 4 the post_content_update signal, then bundles the post up and stores it by forum
bgneal@509 5 ID in Redis. We also maintain a combined forums list. This allows quick
bgneal@509 6 retrieval of the latest posts and avoids some slow SQL queries.
bgneal@509 7
bgneal@522 8 We also do things like send topic notification emails, auto-favorite, and
bgneal@522 9 auto-subscribe functions here rather than bog the user down in the request /
bgneal@522 10 response cycle.
bgneal@522 11
bgneal@509 12 """
bgneal@595 13 # Maintenance notes:
bgneal@595 14 # How we use Redis in this module:
bgneal@595 15 #
bgneal@595 16 # Forum post processing:
bgneal@595 17 #
bgneal@595 18 # * Forum posts are turned into Python dictionaries, then converted to JSON and
bgneal@595 19 # stored under keys: forums:post:id
bgneal@595 20 # * Each forum has a list in Redis stored under the key: forums:rss:id. This
bgneal@595 21 # is a list of post IDs.
bgneal@595 22 # * There is also a key called forums:rss:* which is the combined latest
bgneal@595 23 # feed. It is also a list of post IDs.
bgneal@595 24 # * A sorted set is maintained that keeps track of the reference count for each
bgneal@595 25 # post. When a new post is created, this reference count is 2 because it is
bgneal@595 26 # stored in both the combined list and the parent forum list.
bgneal@595 27 # This sorted set is stored under the key: forums:post_ref_cnt.
bgneal@595 28 # * When a post falls off a list due to aging, the reference count in the
bgneal@595 29 # ordered set is decremented. If it falls to zero, the post's key is deleted
bgneal@595 30 # from Redis.
bgneal@595 31 # * When a post is edited, and it is in Redis, we simply update the JSON
bgneal@595 32 # content.
bgneal@595 33 # * When a post is deleted, and it is in Redis, it is removed from the 2 lists,
bgneal@595 34 # the ordered set, and deleted from Redis.
bgneal@595 35 # * When the RSS feed wants to update, it simply pulls down the entire list of
bgneal@595 36 # post IDs for the feed of interest, then does a get on all the posts.
bgneal@595 37 #
bgneal@595 38 # Topics with recent posts processing:
bgneal@595 39 #
bgneal@595 40 # * A key is created for each topic that is updated.
bgneal@595 41 # * An ordered set of topics is maintained with the current time as the score.
bgneal@595 42 # * An updated topic gets its score bumped.
bgneal@595 43 # * We only allow MAX_UPDATED_TOPICS number of topics in the set. We sort the
bgneal@595 44 # set by score, and the expired topics are removed from the set and their keys
bgneal@595 45 # are deleted from Redis.
bgneal@595 46 # * The template tag (or anyone) who wants the list of topics with new posts
bgneal@595 47 # gets the list of IDs sorted by score from newest to oldest. An mget is then
bgneal@595 48 # performed to get all the topic data and it is deserialized from JSON.
bgneal@595 49 #
bgneal@595 50 # We also maintain topic and post counts in Redis since select(*) can take a
bgneal@595 51 # while with MySQL InnoDb.
bgneal@595 52 #
bgneal@509 53 import datetime
bgneal@679 54 import json
bgneal@522 55 import logging
bgneal@509 56 import time
bgneal@509 57
bgneal@1168 58 from django.conf import settings
bgneal@509 59 from django.dispatch import receiver
bgneal@594 60 from django.template.loader import render_to_string
bgneal@1168 61 import pytz
bgneal@523 62 import redis
bgneal@509 63
bgneal@522 64 from forums.signals import post_content_update, topic_content_update
bgneal@594 65 from forums.models import Forum, Topic, Post, Attachment
bgneal@522 66 from forums.views.subscriptions import notify_topic_subscribers
bgneal@522 67 from forums.tools import auto_favorite, auto_subscribe
bgneal@509 68 from core.services import get_redis_connection
bgneal@792 69 from core.markup import site_markup
bgneal@509 70
bgneal@509 71 # This constant controls how many latest posts per forum we store
bgneal@509 72 MAX_POSTS = 50
bgneal@509 73
bgneal@522 74 # This controls how many updated topics we track
bgneal@522 75 MAX_UPDATED_TOPICS = 50
bgneal@522 76
bgneal@1168 77 SERVER_TZ = pytz.timezone(settings.TIME_ZONE)
bgneal@1168 78
bgneal@522 79 # Redis key names:
bgneal@522 80 POST_COUNT_KEY = "forums:public_post_count"
bgneal@522 81 TOPIC_COUNT_KEY = "forums:public_topic_count"
bgneal@522 82 UPDATED_TOPICS_SET_KEY = "forums:updated_topics:set"
bgneal@522 83 UPDATED_TOPIC_KEY = "forums:updated_topics:%s"
bgneal@595 84 POST_KEY = "forums:post:%s"
bgneal@595 85 FORUM_RSS_KEY = "forums:rss:%s"
bgneal@595 86 ALL_FORUMS_RSS_KEY = "forums:rss:*"
bgneal@595 87 POST_SET_KEY = "forums:post_ref_cnt"
bgneal@522 88
bgneal@522 89 logger = logging.getLogger(__name__)
bgneal@522 90
bgneal@509 91
bgneal@509 92 @receiver(post_content_update, dispatch_uid='forums.latest_posts')
bgneal@509 93 def on_post_update(sender, **kwargs):
bgneal@509 94 """
bgneal@595 95 This function is our signal handler, called when a post has been updated
bgneal@595 96 or created.
bgneal@509 97
bgneal@522 98 We kick off a Celery task to perform work outside of the request/response
bgneal@522 99 cycle.
bgneal@509 100
bgneal@509 101 """
bgneal@595 102 if kwargs['created']:
bgneal@595 103 forums.tasks.new_post_task.delay(sender.id)
bgneal@595 104 else:
bgneal@595 105 forums.tasks.updated_post_task.delay(sender.id)
bgneal@522 106
bgneal@522 107
bgneal@522 108 def process_new_post(post_id):
bgneal@522 109 """
bgneal@522 110 This function is run on a Celery task. It performs all new-post processing.
bgneal@522 111
bgneal@522 112 """
bgneal@522 113 try:
bgneal@522 114 post = Post.objects.select_related().get(pk=post_id)
bgneal@522 115 except Post.DoesNotExist:
bgneal@522 116 logger.warning("process_new_post: post %d does not exist", post_id)
bgneal@509 117 return
bgneal@509 118
bgneal@522 119 # selectively process posts from non-public forums
bgneal@522 120 public_forums = Forum.objects.public_forum_ids()
bgneal@522 121
bgneal@522 122 if post.topic.forum.id in public_forums:
bgneal@523 123 conn = get_redis_connection()
bgneal@523 124 _update_post_feeds(conn, post)
bgneal@523 125 _update_post_count(conn, public_forums)
bgneal@523 126 _update_latest_topics(conn, post)
bgneal@522 127
bgneal@522 128 # send out any email notifications
bgneal@522 129 notify_topic_subscribers(post, defer=False)
bgneal@522 130
bgneal@522 131 # perform any auto-favorite and auto-subscribe actions for the new post
bgneal@522 132 auto_favorite(post)
bgneal@522 133 auto_subscribe(post)
bgneal@522 134
bgneal@522 135
bgneal@595 136 def process_updated_post(post_id):
bgneal@595 137 """
bgneal@595 138 This function is run on a Celery task. It performs all updated-post
bgneal@595 139 processing.
bgneal@595 140
bgneal@595 141 """
bgneal@595 142 # Is this post ID in a RSS feed?
bgneal@595 143 conn = get_redis_connection()
bgneal@595 144 post_key = POST_KEY % post_id
bgneal@595 145 post_val = conn.get(post_key)
bgneal@595 146
bgneal@595 147 if post_val is not None:
bgneal@595 148 # Update the post value in Redis
bgneal@595 149 try:
bgneal@595 150 post = Post.objects.select_related().get(pk=post_id)
bgneal@595 151 except Post.DoesNotExist:
bgneal@595 152 logger.warning("process_updated_post: post %d does not exist", post_id)
bgneal@595 153 return
bgneal@595 154 conn.set(post_key, _serialize_post(post))
bgneal@595 155
bgneal@595 156
bgneal@523 157 def _update_post_feeds(conn, post):
bgneal@522 158 """
bgneal@522 159 Updates the forum feeds we keep in Redis so that our RSS feeds are quick.
bgneal@522 160
bgneal@522 161 """
bgneal@595 162 post_key = POST_KEY % post.id
bgneal@595 163 post_value = _serialize_post(post)
bgneal@509 164
bgneal@523 165 pipeline = conn.pipeline()
bgneal@509 166
bgneal@595 167 # Store serialized post content under its own key
bgneal@595 168 pipeline.set(post_key, post_value)
bgneal@509 169
bgneal@595 170 # Store in the RSS feed for the post's forum
bgneal@595 171 forum_key = FORUM_RSS_KEY % post.topic.forum.id
bgneal@595 172 pipeline.lpush(forum_key, post.id)
bgneal@509 173
bgneal@595 174 # Store in the RSS feed for combined forums
bgneal@595 175 pipeline.lpush(ALL_FORUMS_RSS_KEY, post.id)
bgneal@509 176
bgneal@595 177 # Store reference count for the post
bgneal@595 178 pipeline.zadd(POST_SET_KEY, 2, post.id)
bgneal@509 179
bgneal@595 180 results = pipeline.execute()
bgneal@509 181
bgneal@595 182 # Make sure our forums RSS lists lengths are not exceeded
bgneal@595 183
bgneal@595 184 if results[1] > MAX_POSTS or results[2] > MAX_POSTS:
bgneal@595 185 pipeline = conn.pipeline()
bgneal@595 186
bgneal@595 187 # Truncate lists of posts:
bgneal@595 188 if results[1] > MAX_POSTS:
bgneal@595 189 pipeline.rpop(forum_key)
bgneal@595 190 if results[2] > MAX_POSTS:
bgneal@595 191 pipeline.rpop(ALL_FORUMS_RSS_KEY)
bgneal@595 192 post_ids = pipeline.execute()
bgneal@595 193
bgneal@595 194 # Decrement reference count(s)
bgneal@595 195 pipeline = conn.pipeline()
bgneal@595 196 for post_id in post_ids:
bgneal@595 197 pipeline.zincrby(POST_SET_KEY, post_id, -1)
bgneal@595 198 scores = pipeline.execute()
bgneal@595 199
bgneal@595 200 # If any reference counts have fallen to 0, clean up:
bgneal@595 201 if not all(scores):
bgneal@595 202 pipeline = conn.pipeline()
bgneal@595 203
bgneal@595 204 # remove from post set
bgneal@595 205 ids = [post_ids[n] for n, s in enumerate(scores) if s <= 0.0]
bgneal@595 206 pipeline.zrem(POST_SET_KEY, *ids)
bgneal@595 207
bgneal@595 208 # remove serialized post data
bgneal@595 209 keys = [POST_KEY % n for n in ids]
bgneal@595 210 pipeline.delete(*keys)
bgneal@595 211
bgneal@595 212 pipeline.execute()
bgneal@509 213
bgneal@509 214
bgneal@523 215 def _update_post_count(conn, public_forums):
bgneal@522 216 """
bgneal@522 217 Updates the post count we cache in Redis. Doing a COUNT(*) on the post table
bgneal@522 218 can be expensive in MySQL InnoDB.
bgneal@522 219
bgneal@522 220 """
bgneal@523 221 result = conn.incr(POST_COUNT_KEY)
bgneal@522 222 if result == 1:
bgneal@522 223 # it is likely redis got trashed, so re-compute the correct value
bgneal@522 224
bgneal@522 225 count = Post.objects.filter(topic__forum__in=public_forums).count()
bgneal@523 226 conn.set(POST_COUNT_KEY, count)
bgneal@522 227
bgneal@522 228
bgneal@523 229 def _update_latest_topics(conn, post):
bgneal@522 230 """
bgneal@522 231 Updates the "latest topics with new posts" list we cache in Redis for speed.
bgneal@522 232 There is a template tag and forum view that uses this information.
bgneal@522 233
bgneal@522 234 """
bgneal@522 235 # serialize topic attributes
bgneal@522 236 topic_id = post.topic.id
bgneal@522 237 topic_score = int(time.mktime(post.creation_date.timetuple()))
bgneal@522 238
bgneal@522 239 topic_content = {
bgneal@522 240 'title': post.topic.name,
bgneal@522 241 'author': post.user.username,
bgneal@522 242 'date': topic_score,
bgneal@529 243 'url': post.topic.get_latest_post_url()
bgneal@522 244 }
bgneal@679 245 topic_json = json.dumps(topic_content)
bgneal@522 246 key = UPDATED_TOPIC_KEY % topic_id
bgneal@522 247
bgneal@523 248 pipeline = conn.pipeline()
bgneal@679 249 pipeline.set(key, topic_json)
bgneal@522 250 pipeline.zadd(UPDATED_TOPICS_SET_KEY, topic_score, topic_id)
bgneal@522 251 pipeline.zcard(UPDATED_TOPICS_SET_KEY)
bgneal@522 252 results = pipeline.execute()
bgneal@522 253
bgneal@522 254 # delete topics beyond our maximum count
bgneal@522 255 num_topics = results[-1]
bgneal@522 256 num_to_del = num_topics - MAX_UPDATED_TOPICS
bgneal@522 257 if num_to_del > 0:
bgneal@522 258 # get the IDs of the topics we need to delete first
bgneal@522 259 start = 0
bgneal@522 260 stop = num_to_del - 1 # Redis indices are inclusive
bgneal@523 261 old_ids = conn.zrange(UPDATED_TOPICS_SET_KEY, start, stop)
bgneal@522 262
bgneal@522 263 keys = [UPDATED_TOPIC_KEY % n for n in old_ids]
bgneal@523 264 conn.delete(*keys)
bgneal@522 265
bgneal@522 266 # now delete the oldest num_to_del topics
bgneal@523 267 conn.zremrangebyrank(UPDATED_TOPICS_SET_KEY, start, stop)
bgneal@522 268
bgneal@522 269
bgneal@509 270 def get_latest_posts(num_posts=MAX_POSTS, forum_id=None):
bgneal@509 271 """
bgneal@509 272 This function retrieves num_posts latest posts for the forum with the given
bgneal@509 273 forum_id. If forum_id is None, the posts are retrieved from the combined
bgneal@509 274 forums datastore. A list of dictionaries is returned. Each dictionary
bgneal@509 275 contains information about a post.
bgneal@509 276
bgneal@509 277 """
bgneal@595 278 key = FORUM_RSS_KEY % forum_id if forum_id else ALL_FORUMS_RSS_KEY
bgneal@509 279
bgneal@509 280 num_posts = max(0, min(MAX_POSTS, num_posts))
bgneal@509 281
bgneal@509 282 if num_posts == 0:
bgneal@509 283 return []
bgneal@509 284
bgneal@523 285 conn = get_redis_connection()
bgneal@595 286 post_ids = conn.lrange(key, 0, num_posts - 1)
bgneal@595 287 if not post_ids:
bgneal@595 288 return []
bgneal@595 289
bgneal@595 290 post_keys = [POST_KEY % n for n in post_ids]
bgneal@595 291 raw_posts = conn.mget(post_keys)
bgneal@595 292 raw_posts = [s for s in raw_posts if s is not None]
bgneal@509 293
bgneal@509 294 posts = []
bgneal@509 295 for raw_post in raw_posts:
bgneal@679 296 post = json.loads(raw_post)
bgneal@509 297
bgneal@509 298 # fix up the pubdate; turn it back into a datetime object
bgneal@1168 299 pubdate = datetime.datetime.utcfromtimestamp(post['pubdate'])
bgneal@1168 300 pubdate.replace(tzinfo=SERVER_TZ)
bgneal@1168 301 post['pubdate'] = pubdate
bgneal@509 302
bgneal@509 303 posts.append(post)
bgneal@509 304
bgneal@509 305 return posts
bgneal@522 306
bgneal@522 307
bgneal@522 308 @receiver(topic_content_update, dispatch_uid='forums.latest_posts')
bgneal@522 309 def on_topic_update(sender, **kwargs):
bgneal@522 310 """
bgneal@595 311 This function is our signal handler, called when a topic has been updated
bgneal@595 312 or created.
bgneal@522 313
bgneal@522 314 We kick off a Celery task to perform work outside of the request/response
bgneal@522 315 cycle.
bgneal@522 316
bgneal@522 317 """
bgneal@595 318 if kwargs['created']:
bgneal@595 319 forums.tasks.new_topic_task.delay(sender.id)
bgneal@595 320 else:
bgneal@595 321 forums.tasks.updated_topic_task.delay(sender.id)
bgneal@522 322
bgneal@522 323
bgneal@522 324 def process_new_topic(topic_id):
bgneal@522 325 """
bgneal@522 326 This function contains new topic processing. Currently we only update the
bgneal@522 327 topic count statistic.
bgneal@522 328
bgneal@522 329 """
bgneal@522 330 try:
bgneal@522 331 topic = Topic.objects.select_related().get(pk=topic_id)
bgneal@522 332 except Topic.DoesNotExist:
bgneal@522 333 logger.warning("process_new_topic: topic %d does not exist", topic_id)
bgneal@522 334 return
bgneal@522 335
bgneal@522 336 # selectively process topics from non-public forums
bgneal@522 337 public_forums = Forum.objects.public_forum_ids()
bgneal@522 338
bgneal@522 339 if topic.forum.id not in public_forums:
bgneal@522 340 return
bgneal@522 341
bgneal@522 342 # update the topic count statistic
bgneal@523 343 conn = get_redis_connection()
bgneal@522 344
bgneal@523 345 result = conn.incr(TOPIC_COUNT_KEY)
bgneal@522 346 if result == 1:
bgneal@522 347 # it is likely redis got trashed, so re-compute the correct value
bgneal@522 348
bgneal@522 349 count = Topic.objects.filter(forum__in=public_forums).count()
bgneal@523 350 conn.set(TOPIC_COUNT_KEY, count)
bgneal@522 351
bgneal@522 352
bgneal@595 353 def process_updated_topic(topic_id):
bgneal@595 354 """
bgneal@595 355 This function contains updated topic processing. Update the title only.
bgneal@595 356
bgneal@595 357 """
bgneal@595 358 conn = get_redis_connection()
bgneal@595 359 key = UPDATED_TOPIC_KEY % topic_id
bgneal@679 360 topic_json = conn.get(key)
bgneal@679 361 if topic_json is not None:
bgneal@595 362 try:
bgneal@595 363 topic = Topic.objects.get(pk=topic_id)
bgneal@595 364 except Topic.DoesNotExist:
bgneal@595 365 logger.warning("topic %d does not exist", topic_id)
bgneal@595 366 return
bgneal@595 367
bgneal@679 368 topic_dict = json.loads(topic_json)
bgneal@595 369
bgneal@595 370 if topic.name != topic_dict['title']:
bgneal@595 371 topic_dict['title'] = topic.name
bgneal@679 372 topic_json = json.dumps(topic_dict)
bgneal@679 373 conn.set(key, topic_json)
bgneal@595 374
bgneal@595 375
bgneal@522 376 def get_stats():
bgneal@522 377 """
bgneal@522 378 This function returns the topic and post count statistics as a tuple, in
bgneal@522 379 that order. If a statistic is not available, its position in the tuple will
bgneal@522 380 be None.
bgneal@522 381
bgneal@522 382 """
bgneal@522 383 try:
bgneal@523 384 conn = get_redis_connection()
bgneal@523 385 result = conn.mget(TOPIC_COUNT_KEY, POST_COUNT_KEY)
bgneal@522 386 except redis.RedisError, e:
bgneal@522 387 logger.error(e)
bgneal@522 388 return (None, None)
bgneal@522 389
bgneal@522 390 topic_count = int(result[0]) if result[0] else None
bgneal@522 391 post_count = int(result[1]) if result[1] else None
bgneal@522 392
bgneal@522 393 return (topic_count, post_count)
bgneal@522 394
bgneal@522 395
bgneal@522 396 def get_latest_topic_ids(num):
bgneal@522 397 """
bgneal@522 398 Return a list of topic ids from the latest topics that have posts. The ids
bgneal@522 399 will be sorted from newest to oldest.
bgneal@522 400
bgneal@522 401 """
bgneal@522 402 try:
bgneal@523 403 conn = get_redis_connection()
bgneal@523 404 result = conn.zrevrange(UPDATED_TOPICS_SET_KEY, 0, num - 1)
bgneal@522 405 except redis.RedisError, e:
bgneal@522 406 logger.error(e)
bgneal@522 407 return []
bgneal@522 408
bgneal@522 409 return [int(n) for n in result]
bgneal@522 410
bgneal@522 411
bgneal@522 412 def get_latest_topics(num):
bgneal@522 413 """
bgneal@522 414 Return a list of dictionaries with information about the latest topics that
bgneal@522 415 have updated posts. The topics are sorted from newest to oldest.
bgneal@522 416
bgneal@522 417 """
bgneal@522 418 try:
bgneal@523 419 conn = get_redis_connection()
bgneal@523 420 result = conn.zrevrange(UPDATED_TOPICS_SET_KEY, 0, num - 1)
bgneal@522 421
bgneal@522 422 topic_keys = [UPDATED_TOPIC_KEY % n for n in result]
bgneal@524 423 json_list = conn.mget(topic_keys) if topic_keys else []
bgneal@522 424
bgneal@522 425 except redis.RedisError, e:
bgneal@522 426 logger.error(e)
bgneal@522 427 return []
bgneal@522 428
bgneal@522 429 topics = []
bgneal@522 430 for s in json_list:
bgneal@679 431 item = json.loads(s)
bgneal@522 432 item['date'] = datetime.datetime.fromtimestamp(item['date'])
bgneal@522 433 topics.append(item)
bgneal@522 434
bgneal@522 435 return topics
bgneal@522 436
bgneal@522 437
bgneal@522 438 def notify_topic_delete(topic):
bgneal@522 439 """
bgneal@522 440 This function should be called when a topic is deleted. It will remove the
bgneal@522 441 topic from the updated topics set, if present, and delete any info we have
bgneal@522 442 about the topic.
bgneal@522 443
bgneal@522 444 Note we don't do anything like this for posts. Since they just populate RSS
bgneal@522 445 feeds we'll let them 404. The updated topic list is seen in a prominent
bgneal@522 446 template tag however, so it is a bit more important to get that cleaned up.
bgneal@522 447
bgneal@522 448 """
bgneal@522 449 try:
bgneal@523 450 conn = get_redis_connection()
bgneal@523 451 pipeline = conn.pipeline()
bgneal@522 452 pipeline.zrem(UPDATED_TOPICS_SET_KEY, topic.id)
bgneal@522 453 pipeline.delete(UPDATED_TOPIC_KEY % topic.id)
bgneal@522 454 pipeline.execute()
bgneal@522 455 except redis.RedisError, e:
bgneal@522 456 logger.error(e)
bgneal@522 457
bgneal@522 458
bgneal@595 459 def _serialize_post(post):
bgneal@595 460 """Serialize a post to JSON and return it.
bgneal@595 461
bgneal@595 462 """
bgneal@792 463 # Use absolute URLs for smileys for RSS. This means we have to reconvert the
bgneal@792 464 # post Markdown to HTML.
bgneal@792 465 content = site_markup(post.body, relative_urls=False)
bgneal@792 466
bgneal@595 467 # get any attachments for the post
bgneal@595 468 attachments = Attachment.objects.filter(post=post).select_related(
bgneal@595 469 'embed').order_by('order')
bgneal@595 470 embeds = [item.embed for item in attachments]
bgneal@792 471 if len(embeds):
bgneal@595 472 content = render_to_string('forums/post_rss.html', {
bgneal@792 473 'content': content,
bgneal@595 474 'embeds': embeds,
bgneal@595 475 })
bgneal@595 476
bgneal@595 477 # serialize post attributes
bgneal@595 478 post_content = {
bgneal@595 479 'id': post.id,
bgneal@595 480 'title': post.topic.name,
bgneal@595 481 'content': content,
bgneal@595 482 'author': post.user.username,
bgneal@1168 483 'pubdate': int(time.mktime(post.creation_date.utctimetuple())),
bgneal@595 484 'forum_name': post.topic.forum.name,
bgneal@595 485 'url': post.get_absolute_url()
bgneal@595 486 }
bgneal@595 487
bgneal@679 488 return json.dumps(post_content)
bgneal@595 489
bgneal@595 490
bgneal@522 491 # Down here to avoid a circular import
bgneal@522 492 import forums.tasks