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import logging
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from adjacent import Client
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from django.db.models import Count, Sum, QuerySet, Q
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from django.utils import timezone
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from django.db import models, transaction
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from boards.models import STATUS_BUMPLIMIT, STATUS_ACTIVE, STATUS_ARCHIVE
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from boards import settings
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import boards
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from boards.utils import cached_result, datetime_to_epoch
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from boards.models.post import Post
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from boards.models.tag import Tag
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FAV_THREAD_NO_UPDATES = -1
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__author__ = 'neko259'
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logger = logging.getLogger(__name__)
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WS_NOTIFICATION_TYPE_NEW_POST = 'new_post'
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WS_NOTIFICATION_TYPE = 'notification_type'
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WS_CHANNEL_THREAD = "thread:"
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STATUS_CHOICES = (
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(STATUS_ACTIVE, STATUS_ACTIVE),
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(STATUS_BUMPLIMIT, STATUS_BUMPLIMIT),
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(STATUS_ARCHIVE, STATUS_ARCHIVE),
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)
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class ThreadManager(models.Manager):
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def process_oldest_threads(self):
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"""
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Preserves maximum thread count. If there are too many threads,
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archive or delete the old ones.
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"""
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threads = Thread.objects.exclude(status=STATUS_ARCHIVE).order_by('-bump_time')
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thread_count = threads.count()
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max_thread_count = settings.get_int('Messages', 'MaxThreadCount')
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if thread_count > max_thread_count:
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num_threads_to_delete = thread_count - max_thread_count
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old_threads = threads[thread_count - num_threads_to_delete:]
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for thread in old_threads:
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if settings.get_bool('Storage', 'ArchiveThreads'):
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self._archive_thread(thread)
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else:
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thread.delete()
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logger.info('Processed %d old threads' % num_threads_to_delete)
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def _archive_thread(self, thread):
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thread.status = STATUS_ARCHIVE
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thread.last_edit_time = timezone.now()
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thread.update_posts_time()
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thread.save(update_fields=['last_edit_time', 'status'])
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def get_new_posts(self, datas):
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query = None
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# TODO Use classes instead of dicts
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for data in datas:
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if data['last_id'] != FAV_THREAD_NO_UPDATES:
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q = (Q(id=data['op'].get_thread_id())
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& Q(multi_replies__id__gt=data['last_id']))
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if query is None:
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query = q
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else:
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query = query | q
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if query is not None:
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return self.filter(query).annotate(
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new_post_count=Count('multi_replies'))
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def get_new_post_count(self, datas):
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new_posts = self.get_new_posts(datas)
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return new_posts.aggregate(total_count=Count('multi_replies'))\
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['total_count'] if new_posts else 0
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def get_thread_max_posts():
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return settings.get_int('Messages', 'MaxPostsPerThread')
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class Thread(models.Model):
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objects = ThreadManager()
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class Meta:
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app_label = 'boards'
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tags = models.ManyToManyField('Tag', related_name='thread_tags')
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bump_time = models.DateTimeField(db_index=True)
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last_edit_time = models.DateTimeField()
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max_posts = models.IntegerField(default=get_thread_max_posts)
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status = models.CharField(max_length=50, default=STATUS_ACTIVE,
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choices=STATUS_CHOICES)
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monochrome = models.BooleanField(default=False)
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def get_tags(self) -> QuerySet:
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"""
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Gets a sorted tag list.
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"""
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return self.tags.order_by('name')
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def bump(self):
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"""
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Bumps (moves to up) thread if possible.
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"""
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if self.can_bump():
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self.bump_time = self.last_edit_time
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self.update_bump_status()
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logger.info('Bumped thread %d' % self.id)
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def has_post_limit(self) -> bool:
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return self.max_posts > 0
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def update_bump_status(self, exclude_posts=None):
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if self.has_post_limit() and self.get_reply_count() >= self.max_posts:
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self.status = STATUS_BUMPLIMIT
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self.update_posts_time(exclude_posts=exclude_posts)
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def _get_cache_key(self):
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return [datetime_to_epoch(self.last_edit_time)]
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@cached_result(key_method=_get_cache_key)
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def get_reply_count(self) -> int:
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return self.get_replies().count()
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@cached_result(key_method=_get_cache_key)
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def get_images_count(self) -> int:
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return self.get_replies().annotate(images_count=Count(
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'images')).aggregate(Sum('images_count'))['images_count__sum']
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def can_bump(self) -> bool:
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"""
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Checks if the thread can be bumped by replying to it.
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"""
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return self.get_status() == STATUS_ACTIVE
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def get_last_replies(self) -> QuerySet:
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"""
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Gets several last replies, not including opening post
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"""
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last_replies_count = settings.get_int('View', 'LastRepliesCount')
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if last_replies_count > 0:
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reply_count = self.get_reply_count()
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if reply_count > 0:
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reply_count_to_show = min(last_replies_count,
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reply_count - 1)
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replies = self.get_replies()
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last_replies = replies[reply_count - reply_count_to_show:]
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return last_replies
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def get_skipped_replies_count(self) -> int:
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"""
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Gets number of posts between opening post and last replies.
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"""
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reply_count = self.get_reply_count()
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last_replies_count = min(settings.get_int('View', 'LastRepliesCount'),
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reply_count - 1)
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return reply_count - last_replies_count - 1
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def get_replies(self, view_fields_only=False) -> QuerySet:
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"""
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Gets sorted thread posts
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"""
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query = self.multi_replies.order_by('pub_time').prefetch_related(
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'images', 'thread', 'threads', 'attachments')
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if view_fields_only:
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query = query.defer('poster_ip')
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return query.all()
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def get_top_level_replies(self) -> QuerySet:
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return self.get_replies().exclude(refposts__threads__in=[self])
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def get_replies_with_images(self, view_fields_only=False) -> QuerySet:
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"""
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Gets replies that have at least one image attached
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"""
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return self.get_replies(view_fields_only).annotate(images_count=Count(
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'images')).filter(images_count__gt=0)
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def get_opening_post(self, only_id=False) -> Post:
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"""
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Gets the first post of the thread
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"""
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query = self.get_replies().filter(opening=True)
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if only_id:
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query = query.only('id')
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opening_post = query.first()
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return opening_post
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@cached_result()
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def get_opening_post_id(self) -> int:
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"""
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Gets ID of the first thread post.
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"""
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return self.get_opening_post(only_id=True).id
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def get_pub_time(self):
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"""
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Gets opening post's pub time because thread does not have its own one.
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"""
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return self.get_opening_post().pub_time
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def __str__(self):
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return 'T#{}/{}'.format(self.id, self.get_opening_post_id())
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def get_tag_url_list(self) -> list:
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return boards.models.Tag.objects.get_tag_url_list(self.get_tags())
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def update_posts_time(self, exclude_posts=None):
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last_edit_time = self.last_edit_time
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for post in self.multi_replies.all():
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if exclude_posts is None or post not in exclude_posts:
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# Manual update is required because uids are generated on save
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post.last_edit_time = last_edit_time
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post.save(update_fields=['last_edit_time'])
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post.get_threads().update(last_edit_time=last_edit_time)
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def notify_clients(self):
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if not settings.get_bool('External', 'WebsocketsEnabled'):
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return
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client = Client()
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channel_name = WS_CHANNEL_THREAD + str(self.get_opening_post_id())
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client.publish(channel_name, {
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WS_NOTIFICATION_TYPE: WS_NOTIFICATION_TYPE_NEW_POST,
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})
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client.send()
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def get_absolute_url(self):
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return self.get_opening_post().get_absolute_url()
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def get_required_tags(self):
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return self.get_tags().filter(required=True)
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def get_replies_newer(self, post_id):
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return self.get_replies().filter(id__gt=post_id)
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def is_archived(self):
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return self.get_status() == STATUS_ARCHIVE
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def get_status(self):
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return self.status
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def is_monochrome(self):
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return self.monochrome
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# If tags have parent, add them to the tag list
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@transaction.atomic
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def refresh_tags(self):
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for tag in self.get_tags().all():
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parents = tag.get_all_parents()
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if len(parents) > 0:
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self.tags.add(*parents)
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def get_reply_tree(self):
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replies = self.get_replies().prefetch_related('refposts')
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tree = []
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for reply in replies:
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parents = reply.refposts.all()
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found_parent = False
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searching_for_index = False
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if len(parents) > 0:
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index = 0
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parent_depth = 0
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indexes_to_insert = []
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for depth, element in tree:
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index += 1
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# If this element is next after parent on the same level,
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# insert child before it
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if searching_for_index and depth <= parent_depth:
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indexes_to_insert.append((index - 1, parent_depth))
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searching_for_index = False
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if element in parents:
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found_parent = True
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searching_for_index = True
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parent_depth = depth
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if not found_parent:
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tree.append((0, reply))
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else:
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if searching_for_index:
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tree.append((parent_depth + 1, reply))
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offset = 0
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for last_index, parent_depth in indexes_to_insert:
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tree.insert(last_index + offset, (parent_depth + 1, reply))
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offset += 1
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return tree
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