from django.db import models from django.contrib.auth.models import User from django.contrib.contenttypes.models import ContentType from django.core.cache import cache from utils import feedparser, object_manager from utils.dateutil.parser import parse as dateutil_parse from utils.feed_functions import encode, prints, mtime, levenshtein_distance import time, datetime, random from django.utils.http import urlquote from django.utils.safestring import mark_safe from utils.story_functions import format_story_link_date__short from utils.story_functions import format_story_link_date__long from django.db.models import Q from utils.diff import HTMLDiff import settings import logging USER_AGENT = 'NewsBlur v1.0 - newsblur.com' class Feed(models.Model): feed_address = models.URLField(max_length=255, verify_exists=True, unique=True) feed_link = models.URLField(max_length=200, blank=True) feed_title = models.CharField(max_length=255, blank=True) active = models.BooleanField(default=True) num_subscribers = models.IntegerField(default=0) last_update = models.DateTimeField(auto_now=True, default=0) min_to_decay = models.IntegerField(default=15) days_to_trim = models.IntegerField(default=90) creation = models.DateField(auto_now_add=True) etag = models.CharField(max_length=50, blank=True) last_modified = models.DateTimeField(null=True, blank=True) def __unicode__(self): return self.feed_title def last_updated(self): return time.time() - time.mktime(self.last_update.timetuple()) def new_stories_since_date(self, date): story_count = Story.objects.filter(story_date__gte=date, story_feed=self).count() return story_count def add_feed(self, feed_address, feed_link, feed_title): print locals() def update(self, force=False, feed=None): self.feed_address = self.feed_address % {'NEWSBLUR_DIR': settings.NEWSBLUR_DIR} last_updated = self.last_updated() / 60 min_to_decay = self.min_to_decay + (random.random()*self.min_to_decay) if last_updated < min_to_decay and not force: logging.debug('Feed unchanged: ' + self.feed_title) return feed_updated, feed = cache.get("feed:" + self.feed_address, (None, None,)) if feed and not force: logging.debug('Feed Cached: ' + self.feed_title) if not feed or force: last_modified = None now = datetime.datetime.now() if self.last_modified: last_modified = datetime.datetime.timetuple(self.last_modified) if not feed: logging.debug('[%d] Retrieving Feed: %s' % (self.id, self.feed_title)) feed = feedparser.parse(self.feed_address, etag=self.etag, modified=last_modified, agent=USER_AGENT) cache.set("feed:" + self.feed_address, (now, feed), min_to_decay) # check for movement or disappearance if hasattr(feed, 'status'): if feed.status == 301: self.feed_url = feed.href if feed.status == 410: self.active = False if feed.status >= 400: return # Fill in optional fields if not self.feed_title: self.feed_title = feed.feed.get('title', feed.feed.get('link')) if not self.feed_link: self.feed_link = feed.feed.get('link') self.etag = feed.get('etag', '') self.last_update = datetime.datetime.now() self.last_modified = mtime(feed.get('modified', datetime.datetime.timetuple(datetime.datetime.now()))) self.save() num_entries = len(feed['entries']) # Compare new stories to existing stories, adding and updating existing_stories = Story.objects.filter( story_feed=self ).order_by('-story_date').values()[:num_entries] self.add_update_stories(feed['entries'], existing_stories) self.trim_feed(); return def add_update_stories(self, stories, existing_stories): for story in stories: story = self._pre_process_story(story) if story.get('title'): story_contents = story.get('content') if story_contents is not None: story_content = story_contents[0]['value'] else: story_content = story.get('summary') existing_story, is_different = self._exists_story(story, story_content, existing_stories) if existing_story is None: pub_date = datetime.datetime.timetuple(story.get('published')) logging.debug('- New story: %s %s' % (pub_date, story.get('title'))) s = Story(story_feed = self, story_date = story.get('published'), story_title = story.get('title'), story_content = story_content, story_author = story.get('author'), story_permalink = story.get('link') ) try: s.save(force_insert=True) except: pass elif existing_story and is_different: # update story logging.debug('- Updated story in feed (%s - %s/%s): %s / %s' % (self.feed_title, len(existing_story['story_content']), len(story.get('title')), len(existing_story['story_content']), len(story_content))) original_content = None if existing_story['story_original_content']: original_content = existing_story['story_original_content'] else: original_content = existing_story['story_content'] diff = HTMLDiff(original_content, story_content) # logging.debug("\t\tDiff: %s %s %s" % diff.getStats()) # logging.debug("\t\tDiff content: %s" % diff.getDiff()) if existing_story['story_title'] != story.get('title'): logging.debug('\tExisting title / New: : \n\t\t- %s\n\t\t- %s' % (existing_story['story_title'], story.get('title'))) s = Story(id = existing_story['id'], story_feed = self, story_date = story.get('published'), story_title = story.get('title'), story_content = diff.getDiff(), story_original_content = original_content, story_author = story.get('author'), story_permalink = story.get('link') ) try: s.save(force_update=True) except: pass # else: # logging.debug("Unchanged story: %s " % story.get('title')) return def trim_feed(self): date_diff = datetime.datetime.now() - datetime.timedelta(self.days_to_trim) stories = Story.objects.filter(story_feed=self, story_date__lte=date_diff) for story in stories: story.story_past_trim_date = True story.save() def get_stories(self, offset=0, limit=25): stories = cache.get('feed_stories:%s-%s-%s' % (self.id, offset, limit)) if stories is None: stories = Story.objects.filter(story_feed=self).values()[offset:offset+limit] for story in stories: story['short_parsed_date'] = format_story_link_date__short(story['story_date']) story['long_parsed_date'] = format_story_link_date__long(story['story_date']) story['story_feed_title'] = self.feed_title story['story_feed_link'] = mark_safe(self.feed_link) story['story_permalink'] = mark_safe(story['story_permalink']) cache.set('feed_stories:%s-%s-%s' % (self.id, offset, limit), stories) return stories def _exists_story(self, story=None, story_content=None, existing_stories=None): same_story = None is_different = False story_pub_date = story.get('published') start_date = story_pub_date - datetime.timedelta(hours=8) end_date = story_pub_date + datetime.timedelta(hours=8) for existing_story in existing_stories: if story_pub_date > start_date and story_pub_date < end_date: if story.get('link') == existing_story['story_permalink']: same_story = existing_story story_title_difference = levenshtein_distance(story.get('title'), existing_story['story_title']) if same_story and story_title_difference < 10: same_story = existing_story if story_title_difference > 0: is_different = True if same_story: if story_content != existing_story['story_content']: is_different = True break return same_story, is_different def _pre_process_story(self, entry): date_published = entry.get('published', entry.get('updated')) if not date_published: date_published = str(datetime.datetime.now()) date_published = dateutil_parse(date_published) # Change the date to UTC and remove timezone info since # MySQL doesn't support it. timezone_diff = datetime.datetime.utcnow() - datetime.datetime.now() date_published_offset = date_published.utcoffset() if date_published_offset: date_published = (date_published - date_published_offset - timezone_diff).replace(tzinfo=None) else: date_published = date_published.replace(tzinfo=None) entry['published'] = date_published protocol_index = entry['link'].find("://") if protocol_index != -1: entry['link'] = (entry['link'][:protocol_index+3] + urlquote(entry['link'][protocol_index+3:])) else: entry['link'] = urlquote(entry['link']) return entry class Meta: db_table="feeds" ordering=["feed_title"] class Tag(models.Model): name = models.CharField(max_length=100) def __unicode__(self): return self.name def save(self): super(Tag, self).save() class Story(models.Model): '''A feed item''' story_feed = models.ForeignKey(Feed) story_date = models.DateTimeField() story_title = models.CharField(max_length=255) story_content = models.TextField(null=True, blank=True) story_original_content = models.TextField(null=True, blank=True) story_content_type = models.CharField(max_length=255, null=True, blank=True) story_author = models.CharField(max_length=255, null=True, blank=True) story_permalink = models.CharField(max_length=1000) story_past_trim_date = models.BooleanField(default=False) tags = models.ManyToManyField(Tag) def __unicode__(self): return self.story_title class Meta: verbose_name_plural = "stories" verbose_name = "story" db_table="stories" ordering=["-story_date"]