Start using cached properties (not everywhere yet, still)

boards/models/post.py

@@ -1,451 +1,457 b''
 from datetime import datetime, timedelta, date
 from datetime import time as dtime
 import logging
 import re
 
 from adjacent import Client
 from django.core.cache import cache
+from django.utils.functional import cached_property
 from django.core.urlresolvers import reverse
 from django.db import models, transaction
 from django.db.models import TextField
 from django.template.loader import render_to_string
 from django.utils import timezone
 
 from boards import settings
 from boards.mdx_neboard import bbcode_extended
 from boards.models import PostImage
 from boards.models.base import Viewable
 from boards.models.thread import Thread
 from boards.utils import datetime_to_epoch
 
 
 WS_NOTIFICATION_TYPE_NEW_POST = 'new_post'
 WS_NOTIFICATION_TYPE = 'notification_type'
 
 WS_CHANNEL_THREAD = "thread:"
 
 APP_LABEL_BOARDS = 'boards'
 
 CACHE_KEY_PPD = 'ppd'
 CACHE_KEY_POST_URL = 'post_url'
 
 POSTS_PER_DAY_RANGE = 7
 
 BAN_REASON_AUTO = 'Auto'
 
 IMAGE_THUMB_SIZE = (200, 150)
 
 TITLE_MAX_LENGTH = 200
 
 # TODO This should be removed
 NO_IP = '0.0.0.0'
 
 # TODO Real user agent should be saved instead of this
 UNKNOWN_UA = ''
 
 REGEX_REPLY = re.compile(r'\[post\](\d+)\[/post\]')
 
 PARAMETER_TRUNCATED = 'truncated'
 PARAMETER_TAG = 'tag'
 PARAMETER_OFFSET = 'offset'
 PARAMETER_DIFF_TYPE = 'type'
 PARAMETER_BUMPABLE = 'bumpable'
 PARAMETER_THREAD = 'thread'
 PARAMETER_IS_OPENING = 'is_opening'
 PARAMETER_MODERATOR = 'moderator'
 PARAMETER_POST = 'post'
 PARAMETER_OP_ID = 'opening_post_id'
 PARAMETER_NEED_OPEN_LINK = 'need_open_link'
 
 DIFF_TYPE_HTML = 'html'
 DIFF_TYPE_JSON = 'json'
 
 PREPARSE_PATTERNS = {
     r'>>(\d+)': r'[post]\1[/post]',  # Reflink ">>123"
     r'^>([^>].+)': r'[quote]\1[/quote]',  # Quote ">text"
     r'^//(.+)': r'[comment]\1[/comment]',  # Comment "//text"
 }
 
 
 class PostManager(models.Manager):
     @transaction.atomic
     def create_post(self, title: str, text: str, image=None, thread=None,
                     ip=NO_IP, tags: list=None):
         """
         Creates new post
         """
 
         if not tags:
             tags = []
 
         posting_time = timezone.now()
         if not thread:
             thread = Thread.objects.create(bump_time=posting_time,
                                            last_edit_time=posting_time)
             new_thread = True
         else:
             new_thread = False
 
         pre_text = self._preparse_text(text)
 
         post = self.create(title=title,
                            text=pre_text,
                            pub_time=posting_time,
                            thread_new=thread,
                            poster_ip=ip,
                            poster_user_agent=UNKNOWN_UA,  # TODO Get UA at
                            # last!
                            last_edit_time=posting_time)
 
         logger = logging.getLogger('boards.post.create')
 
         logger.info('Created post {} by {}'.format(
             post, post.poster_ip))
 
         if image:
             # Try to find existing image. If it exists, assign it to the post
             # instead of createing the new one
             image_hash = PostImage.get_hash(image)
             existing = PostImage.objects.filter(hash=image_hash)
             if len(existing) > 0:
                 post_image = existing[0]
             else:
                 post_image = PostImage.objects.create(image=image)
                 logger.info('Created new image #{} for post #{}'.format(
                             post_image.id, post.id))
             post.images.add(post_image)
 
         thread.replies.add(post)
         list(map(thread.add_tag, tags))
 
         if new_thread:
             Thread.objects.process_oldest_threads()
         else:
             thread.bump()
             thread.last_edit_time = posting_time
             thread.save()
 
         self.connect_replies(post)
 
         return post
 
     def delete_posts_by_ip(self, ip):
         """
         Deletes all posts of the author with same IP
         """
 
         posts = self.filter(poster_ip=ip)
         for post in posts:
             post.delete()
 
     def  connect_replies(self, post):
         """
         Connects replies to a post to show them as a reflink map
         """
 
         for reply_number in re.finditer(REGEX_REPLY, post.get_raw_text()):
             post_id = reply_number.group(1)
             ref_post = self.filter(id=post_id)
             if ref_post.count() > 0:
                 referenced_post = ref_post[0]
                 referenced_post.referenced_posts.add(post)
                 referenced_post.last_edit_time = post.pub_time
                 referenced_post.build_refmap()
                 referenced_post.save(update_fields=['refmap', 'last_edit_time'])
 
-                referenced_thread = referenced_post.get_thread()
+                referenced_thread = referenced_post.thread
                 referenced_thread.last_edit_time = post.pub_time
                 referenced_thread.save(update_fields=['last_edit_time'])
 
     def get_posts_per_day(self):
         """
         Gets average count of posts per day for the last 7 days
         """
 
         day_end = date.today()
         day_start = day_end - timedelta(POSTS_PER_DAY_RANGE)
 
         cache_key = CACHE_KEY_PPD + str(day_end)
         ppd = cache.get(cache_key)
         if ppd:
             return ppd
 
         day_time_start = timezone.make_aware(datetime.combine(
             day_start, dtime()), timezone.get_current_timezone())
         day_time_end = timezone.make_aware(datetime.combine(
             day_end, dtime()), timezone.get_current_timezone())
 
         posts_per_period = float(self.filter(
             pub_time__lte=day_time_end,
             pub_time__gte=day_time_start).count())
 
         ppd = posts_per_period / POSTS_PER_DAY_RANGE
 
         cache.set(cache_key, ppd)
         return ppd
 
     def _preparse_text(self, text):
         """
         Preparses text to change patterns like '>>' to a proper bbcode
         tags.
         """
 
         for key, value in PREPARSE_PATTERNS.items():
             text = re.sub(key, value, text, flags=re.MULTILINE)
 
         return text
 
 
 class Post(models.Model, Viewable):
     """A post is a message."""
 
     objects = PostManager()
 
     class Meta:
         app_label = APP_LABEL_BOARDS
         ordering = ('id',)
 
     title = models.CharField(max_length=TITLE_MAX_LENGTH)
     pub_time = models.DateTimeField()
     text = TextField(blank=True, null=True)
     _text_rendered = TextField(blank=True, null=True, editable=False)
 
     images = models.ManyToManyField(PostImage, null=True, blank=True,
                                     related_name='ip+', db_index=True)
 
     poster_ip = models.GenericIPAddressField()
     poster_user_agent = models.TextField()
 
     thread_new = models.ForeignKey('Thread', null=True, default=None,
                                    db_index=True)
     last_edit_time = models.DateTimeField()
 
     referenced_posts = models.ManyToManyField('Post', symmetrical=False,
                                               null=True,
                                               blank=True, related_name='rfp+',
                                               db_index=True)
     refmap = models.TextField(null=True, blank=True)
 
     def __str__(self):
         return 'P#{}/{}'.format(self.id, self.title)
 
     def get_title(self) -> str:
         """
         Gets original post title or part of its text.
         """
 
         title = self.title
         if not title:
             title = self.get_text()
 
         return title
 
     def build_refmap(self) -> None:
         """
         Builds a replies map string from replies list. This is a cache to stop
         the server from recalculating the map on every post show.
         """
         map_string = ''
 
         first = True
         for refpost in self.referenced_posts.all():
             if not first:
                 map_string += ', '
             map_string += '<a href="%s">&gt;&gt;%s</a>' % (refpost.get_url(),
                                                            refpost.id)
             first = False
 
         self.refmap = map_string
 
     def get_sorted_referenced_posts(self):
         return self.refmap
 
     def is_referenced(self) -> bool:
         if not self.refmap:
             return False
         else:
             return len(self.refmap) > 0
 
     def is_opening(self) -> bool:
         """
         Checks if this is an opening post or just a reply.
         """
 
-        return self.get_thread().get_opening_post_id() == self.id
+        return self.thread.get_opening_post_id() == self.id
 
     @transaction.atomic
     def add_tag(self, tag):
         edit_time = timezone.now()
 
-        thread = self.get_thread()
+        thread = get_thread
         thread.add_tag(tag)
         self.last_edit_time = edit_time
         self.save(update_fields=['last_edit_time'])
 
         thread.last_edit_time = edit_time
         thread.save(update_fields=['last_edit_time'])
 
     def get_url(self, thread=None):
         """
         Gets full url to the post.
         """
 
         cache_key = CACHE_KEY_POST_URL + str(self.id)
         link = cache.get(cache_key)
 
         if not link:
             if not thread:
-                thread = self.get_thread()
+                thread = self.thread
 
             opening_id = thread.get_opening_post_id()
 
             if self.id != opening_id:
                 link = reverse('thread', kwargs={
                     'post_id': opening_id}) + '#' + str(self.id)
             else:
                 link = reverse('thread', kwargs={'post_id': self.id})
 
             cache.set(cache_key, link)
 
         return link
 
+    @cached_property
+    def thread(self):
+        return self.thread_new
+
+    # TODO Deprecated, remove this and use cached property
     def get_thread(self) -> Thread:
         """
         Gets post's thread.
         """
 
         return self.thread_new
 
     def get_referenced_posts(self):
         return self.referenced_posts.only('id', 'thread_new')
 
     def get_view(self, moderator=False, need_open_link=False,
                  truncated=False, *args, **kwargs):
         """
         Renders post's HTML view. Some of the post params can be passed over
         kwargs for the means of caching (if we view the thread, some params
         are same for every post and don't need to be computed over and over.
         """
 
         is_opening = kwargs.get(PARAMETER_IS_OPENING, self.is_opening())
-        thread = kwargs.get(PARAMETER_THREAD, self.get_thread())
+        thread = kwargs.get(PARAMETER_THREAD, self.thread)
         can_bump = kwargs.get(PARAMETER_BUMPABLE, thread.can_bump())
 
         if is_opening:
             opening_post_id = self.id
         else:
             opening_post_id = thread.get_opening_post_id()
 
         return render_to_string('boards/post.html', {
             PARAMETER_POST: self,
             PARAMETER_MODERATOR: moderator,
             PARAMETER_IS_OPENING: is_opening,
             PARAMETER_THREAD: thread,
             PARAMETER_BUMPABLE: can_bump,
             PARAMETER_NEED_OPEN_LINK: need_open_link,
             PARAMETER_TRUNCATED: truncated,
             PARAMETER_OP_ID: opening_post_id,
         })
 
     def get_search_view(self, *args, **kwargs):
         return self.get_view(args, kwargs)
 
     def get_first_image(self) -> PostImage:
         return self.images.earliest('id')
 
     def delete(self, using=None):
         """
         Deletes all post images and the post itself. If the post is opening,
         thread with all posts is deleted.
         """
 
         for image in self.images.all():
             image_refs_count = Post.objects.filter(images__in=[image]).count()
             if image_refs_count == 1:
                 image.delete()
 
         if self.is_opening():
-            self.get_thread().delete()
+            self.thread.delete()
         else:
-            thread = self.get_thread()
+            thread = self.thread
             thread.last_edit_time = timezone.now()
             thread.save()
 
         super(Post, self).delete(using)
 
         logging.getLogger('boards.post.delete').info(
             'Deleted post {}'.format(self))
 
     def get_post_data(self, format_type=DIFF_TYPE_JSON, request=None,
                       include_last_update=False):
         """
         Gets post HTML or JSON data that can be rendered on a page or used by
         API.
         """
 
         if format_type == DIFF_TYPE_HTML:
             params = dict()
             params['post'] = self
             if PARAMETER_TRUNCATED in request.GET:
                 params[PARAMETER_TRUNCATED] = True
 
             return render_to_string('boards/api_post.html', params)
         elif format_type == DIFF_TYPE_JSON:
             post_json = {
                 'id': self.id,
                 'title': self.title,
                 'text': self._text_rendered,
                 }
             if self.images.exists():
                 post_image = self.get_first_image()
                 post_json['image'] = post_image.image.url
                 post_json['image_preview'] = post_image.image.url_200x150
             if include_last_update:
                 post_json['bump_time'] = datetime_to_epoch(
                     self.thread_new.bump_time)
             return post_json
 
     def send_to_websocket(self, request, recursive=True):
         """
         Sends post HTML data to the thread web socket.
         """
 
         if not settings.WEBSOCKETS_ENABLED:
             return
 
         client = Client()
 
-        thread = self.get_thread()
+        thread = self.thread
         thread_id = thread.id
         channel_name = WS_CHANNEL_THREAD + str(thread.get_opening_post_id())
         client.publish(channel_name, {
             WS_NOTIFICATION_TYPE: WS_NOTIFICATION_TYPE_NEW_POST,
         })
         client.send()
 
         logger = logging.getLogger('boards.post.websocket')
 
         logger.info('Sent notification from post #{} to channel {}'.format(
             self.id, channel_name))
 
         if recursive:
             for reply_number in re.finditer(REGEX_REPLY, self.get_raw_text()):
                 post_id = reply_number.group(1)
                 ref_post = Post.objects.filter(id=post_id)[0]
 
                 # If post is in this thread, its thread was already notified.
                 # Otherwise, notify its thread separately.
                 if ref_post.thread_new_id != thread_id:
                     ref_post.send_to_websocket(request, recursive=False)
 
     def save(self, force_insert=False, force_update=False, using=None,
              update_fields=None):
         self._text_rendered = bbcode_extended(self.get_raw_text())
 
         super().save(force_insert, force_update, using, update_fields)
 
     def get_text(self) -> str:
         return self._text_rendered
 
     def get_raw_text(self) -> str:
         return self.text

boards/models/thread.py

@@ -1,182 +1,173 b''
 import logging
 from django.db.models import Count, Sum
 from django.utils import timezone
-from django.core.cache import cache
 from django.db import models
+from django.utils.functional import cached_property
 from boards import settings
 
 __author__ = 'neko259'
 
 
 logger = logging.getLogger(__name__)
 
 
-CACHE_KEY_OPENING_POST = 'opening_post_id'
-
-
 class ThreadManager(models.Manager):
     def process_oldest_threads(self):
         """
          Preserves maximum thread count. If there are too many threads,
          archive or delete the old ones.
          """
 
         threads = Thread.objects.filter(archived=False).order_by('-bump_time')
         thread_count = threads.count()
 
         if thread_count > settings.MAX_THREAD_COUNT:
             num_threads_to_delete = thread_count - settings.MAX_THREAD_COUNT
             old_threads = threads[thread_count - num_threads_to_delete:]
 
             for thread in old_threads:
                 if settings.ARCHIVE_THREADS:
                     self._archive_thread(thread)
                 else:
                     thread.delete()
 
             logger.info('Processed %d old threads' % num_threads_to_delete)
 
     def _archive_thread(self, thread):
         thread.archived = True
         thread.bumpable = False
         thread.last_edit_time = timezone.now()
         thread.save(update_fields=['archived', 'last_edit_time', 'bumpable'])
 
 
 class Thread(models.Model):
     objects = ThreadManager()
 
     class Meta:
         app_label = 'boards'
 
     tags = models.ManyToManyField('Tag')
     bump_time = models.DateTimeField()
     last_edit_time = models.DateTimeField()
     replies = models.ManyToManyField('Post', symmetrical=False, null=True,
                                      blank=True, related_name='tre+')
     archived = models.BooleanField(default=False)
     bumpable = models.BooleanField(default=True)
 
     def get_tags(self):
         """
         Gets a sorted tag list.
         """
 
         return self.tags.order_by('name')
 
     def bump(self):
         """
         Bumps (moves to up) thread if possible.
         """
 
         if self.can_bump():
             self.bump_time = timezone.now()
 
             if self.get_reply_count() >= settings.MAX_POSTS_PER_THREAD:
                 self.bumpable = False
 
             logger.info('Bumped thread %d' % self.id)
 
     def get_reply_count(self):
         return self.replies.count()
 
     def get_images_count(self):
         return self.replies.annotate(images_count=Count(
                 'images')).aggregate(Sum('images_count'))['images_count__sum']
 
     def can_bump(self):
         """
         Checks if the thread can be bumped by replying to it.
         """
 
         return self.bumpable
 
     def get_last_replies(self):
         """
         Gets several last replies, not including opening post
         """
 
         if settings.LAST_REPLIES_COUNT > 0:
             reply_count = self.get_reply_count()
 
             if reply_count > 0:
                 reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
                                           reply_count - 1)
                 replies = self.get_replies()
                 last_replies = replies[reply_count - reply_count_to_show:]
 
                 return last_replies
 
     def get_skipped_replies_count(self):
         """
         Gets number of posts between opening post and last replies.
         """
         reply_count = self.get_reply_count()
         last_replies_count = min(settings.LAST_REPLIES_COUNT,
                                  reply_count - 1)
         return reply_count - last_replies_count - 1
 
     def get_replies(self, view_fields_only=False):
         """
         Gets sorted thread posts
         """
 
         query = self.replies.order_by('pub_time').prefetch_related('images')
         if view_fields_only:
             query = query.defer('poster_user_agent')
         return query.all()
 
     def get_replies_with_images(self, view_fields_only=False):
         return self.get_replies(view_fields_only).annotate(images_count=Count(
             'images')).filter(images_count__gt=0)
 
     def add_tag(self, tag):
         """
         Connects thread to a tag and tag to a thread
         """
 
         self.tags.add(tag)
 
-    def get_opening_post(self, only_id=False):
+    @cached_property
+    def opening_post(self):
+        return self.get_opening_post()
+
+    # TODO Remove this and use cached property
+    def get_opening_post(self):
         """
         Gets the first post of the thread
         """
 
-        query = self.replies.order_by('pub_time')
-        if only_id:
-            query = query.only('id')
-        opening_post = query.first()
-
-        return opening_post
+        return self.replies.order_by('pub_time').first()
 
     def get_opening_post_id(self):
         """
         Gets ID of the first thread post.
         """
 
-        cache_key = CACHE_KEY_OPENING_POST + str(self.id)
-        opening_post_id = cache.get(cache_key)
-        if not opening_post_id:
-            opening_post_id = self.get_opening_post(only_id=True).id
-            cache.set(cache_key, opening_post_id)
-
-        return opening_post_id
+        return self.opening_post.id
 
     def __unicode__(self):
         return str(self.id)
 
     def get_pub_time(self):
         """
         Gets opening post's pub time because thread does not have its own one.
         """
 
-        return self.get_opening_post().pub_time
+        return self.opening_post.pub_time
 
     def delete(self, using=None):
         if self.replies.exists():
             self.replies.all().delete()
 
         super(Thread, self).delete(using)
 
     def __str__(self):
-        return 'T#{}/{}'.format(self.id, self.get_opening_post_id())
  No newline at end of file
+        return 'T#{}/{}'.format(self.id, self.get_opening_post_id())

boards/templatetags/board.py

@@ -1,89 +1,86 b''
 from django.shortcuts import get_object_or_404
 from django import template
 
 
 register = template.Library()
 
 actions = [
     {
         'name': 'google',
         'link': 'http://google.com/searchbyimage?image_url=%s',
     },
     {
         'name': 'iqdb',
         'link': 'http://iqdb.org/?url=%s',
     },
 ]
 
 
 @register.simple_tag(name='post_url')
 def post_url(*args, **kwargs):
     post_id = args[0]
 
     post = get_object_or_404('Post', id=post_id)
 
     return post.get_url()
 
 
 @register.simple_tag(name='post_object_url')
 def post_object_url(*args, **kwargs):
     post = args[0]
 
     if 'thread' in kwargs:
         post_thread = kwargs['thread']
     else:
         post_thread = None
 
     return post.get_url(thread=post_thread)
 
 
 @register.simple_tag(name='image_actions')
 def image_actions(*args, **kwargs):
     image_link = args[0]
     if len(args) > 1:
         image_link = 'http://' + args[1] + image_link # TODO https?
 
     result = ''
 
     for action in actions:
         result += '[<a href="' + action['link'] % image_link + '">' + \
                   action['name'] + '</a>]'
 
     return result
 
 
 # TODO Use get_view of a post instead of this
 @register.inclusion_tag('boards/post.html', name='post_view')
 def post_view(post, moderator=False, need_open_link=False, truncated=False,
               **kwargs):
     """
     Get post
     """
 
     if 'is_opening' in kwargs:
         is_opening = kwargs['is_opening']
     else:
         is_opening = post.is_opening()
 
     if 'thread' in kwargs:
         thread = kwargs['thread']
     else:
         thread = post.get_thread()
 
-    if 'can_bump' in kwargs:
-        can_bump = kwargs['can_bump']
-    else:
-        can_bump = thread.can_bump()
+    can_bump = thread.can_bump()
 
     opening_post_id = thread.get_opening_post_id()
 
     return {
         'post': post,
         'moderator': moderator,
         'is_opening': is_opening,
         'thread': thread,
         'bumpable': can_bump,
         'need_open_link': need_open_link,
         'truncated': truncated,
         'opening_post_id': opening_post_id,
     }