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import time
import datetime
import traceback
import multiprocessing
import urllib2
import xml.sax
import redis
import random
import pymongo
from django.conf import settings
from django.db import IntegrityError
from django.core.cache import cache
from apps.reader.models import UserSubscription
from apps.rss_feeds.models import Feed, MStory
from apps.rss_feeds.page_importer import PageImporter
from apps.rss_feeds.icon_importer import IconImporter
from apps.push.models import PushSubscription
from apps.statistics.models import MAnalyticsFetcher
# from utils import feedparser
from utils import feedparser
from utils.story_functions import pre_process_story, strip_tags
from utils import log as logging
from utils.feed_functions import timelimit, TimeoutError, utf8encode, cache_bust_url
# from utils.feed_functions import mail_feed_error_to_admin
# Refresh feed code adapted from Feedjack.
# http://feedjack.googlecode.com
FEED_OK, FEED_SAME, FEED_ERRPARSE, FEED_ERRHTTP, FEED_ERREXC = range(5)
def mtime(ttime):
""" datetime auxiliar function.
"""
return datetime.datetime.fromtimestamp(time.mktime(ttime))
class FetchFeed:
def __init__(self, feed_id, options):
self.feed = Feed.get_by_id(feed_id)
self.options = options
self.fpf = None
@timelimit(30)
def fetch(self):
"""
Uses feedparser to download the feed. Will be parsed later.
"""
start = time.time()
identity = self.get_identity()
log_msg = u'%2s ---> [%-30s] ~FYFetching feed (~FB%d~FY), last update: %s' % (identity,
self.feed.title[:30],
self.feed.id,
datetime.datetime.now() - self.feed.last_update)
logging.debug(log_msg)
etag=self.feed.etag
modified = self.feed.last_modified.utctimetuple()[:7] if self.feed.last_modified else None
address = self.feed.feed_address
if (self.options.get('force') or random.random() <= .01):
modified = None
etag = None
address = cache_bust_url(address)
logging.debug(u' ---> [%-30s] ~FBForcing fetch: %s' % (
self.feed.title[:30], address))
elif (not self.feed.fetched_once or not self.feed.known_good):
modified = None
etag = None
USER_AGENT = ('NewsBlur Feed Fetcher - %s subscriber%s - %s '
'(Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_1) '
'AppleWebKit/534.48.3 (KHTML, like Gecko) Version/5.1 '
'Safari/534.48.3)' % (
self.feed.num_subscribers,
's' if self.feed.num_subscribers != 1 else '',
self.feed.permalink,
))
if self.options.get('feed_xml'):
logging.debug(u' ---> [%-30s] ~FM~BKFeed has been fat pinged. Ignoring fat: %s' % (
self.feed.title[:30], len(self.options.get('feed_xml'))))
if self.options.get('fpf'):
self.fpf = self.options.get('fpf')
logging.debug(u' ---> [%-30s] ~FM~BKFeed fetched in real-time with fat ping.' % (
self.feed.title[:30]))
return FEED_OK, self.fpf
try:
self.fpf = feedparser.parse(address,
agent=USER_AGENT,
etag=etag,
modified=modified)
except (TypeError, ValueError, KeyError, EOFError), e:
logging.debug(u' ***> [%-30s] ~FR%s, turning off headers.' %
(self.feed.title[:30], e))
self.fpf = feedparser.parse(address, agent=USER_AGENT)
except (TypeError, ValueError, KeyError, EOFError), e:
logging.debug(u' ***> [%-30s] ~FR%s fetch failed: %s.' %
(self.feed.title[:30], e))
return FEED_ERRHTTP, None
logging.debug(u' ---> [%-30s] ~FYFeed fetch in ~FM%.4ss' % (
self.feed.title[:30], time.time() - start))
return FEED_OK, self.fpf
def get_identity(self):
identity = "X"
current_process = multiprocessing.current_process()
if current_process._identity:
identity = current_process._identity[0]
return identity
class ProcessFeed:
def __init__(self, feed_id, fpf, options):
self.feed_id = feed_id
self.options = options
self.fpf = fpf
def refresh_feed(self):
self.feed = Feed.get_by_id(self.feed_id)
if self.feed_id != self.feed.pk:
logging.debug(" ***> Feed has changed: from %s to %s" % (self.feed_id, self.feed.pk))
self.feed_id = self.feed.pk
def process(self):
""" Downloads and parses a feed.
"""
start = time.time()
self.refresh_feed()
ret_values = dict(new=0, updated=0, same=0, error=0)
if hasattr(self.fpf, 'status'):
if self.options['verbose']:
if self.fpf.bozo and self.fpf.status != 304:
logging.debug(u' ---> [%-30s] ~FRBOZO exception: %s ~SB(%s entries)' % (
self.feed.title[:30],
self.fpf.bozo_exception,
len(self.fpf.entries)))
if self.fpf.status == 304:
self.feed = self.feed.save()
self.feed.save_feed_history(304, "Not modified")
return FEED_SAME, ret_values
# 302: Temporary redirect: ignore
# 301: Permanent redirect: save it
if self.fpf.status == 301:
if not self.fpf.href.endswith('feedburner.com/atom.xml'):
self.feed.feed_address = self.fpf.href
if not self.feed.known_good:
self.feed.fetched_once = True
logging.debug(" ---> [%-30s] ~SB~SK~FRFeed is %s'ing. Refetching..." % (self.feed.title[:30], self.fpf.status))
self.feed = self.feed.schedule_feed_fetch_immediately()
if not self.fpf.entries:
self.feed = self.feed.save()
self.feed.save_feed_history(self.fpf.status, "HTTP Redirect")
return FEED_ERRHTTP, ret_values
if self.fpf.status >= 400:
logging.debug(" ---> [%-30s] ~SB~FRHTTP Status code: %s. Checking address..." % (self.feed.title[:30], self.fpf.status))
fixed_feed = None
if not self.feed.known_good:
fixed_feed, feed = self.feed.check_feed_link_for_feed_address()
if not fixed_feed:
self.feed.save_feed_history(self.fpf.status, "HTTP Error")
else:
self.feed = feed
self.feed = self.feed.save()
return FEED_ERRHTTP, ret_values
if not self.fpf.entries:
if self.fpf.bozo and isinstance(self.fpf.bozo_exception, feedparser.NonXMLContentType):
logging.debug(" ---> [%-30s] ~SB~FRFeed is Non-XML. %s entries. Checking address..." % (self.feed.title[:30], len(self.fpf.entries)))
fixed_feed = None
if not self.feed.known_good:
fixed_feed, feed = self.feed.check_feed_link_for_feed_address()
if not fixed_feed:
self.feed.save_feed_history(552, 'Non-xml feed', self.fpf.bozo_exception)
else:
self.feed = feed
self.feed = self.feed.save()
return FEED_ERRPARSE, ret_values
elif self.fpf.bozo and isinstance(self.fpf.bozo_exception, xml.sax._exceptions.SAXException):
logging.debug(" ---> [%-30s] ~SB~FRFeed has SAX/XML parsing issues. %s entries. Checking address..." % (self.feed.title[:30], len(self.fpf.entries)))
fixed_feed = None
if not self.feed.known_good:
fixed_feed, feed = self.feed.check_feed_link_for_feed_address()
if not fixed_feed:
self.feed.save_feed_history(553, 'SAX Exception', self.fpf.bozo_exception)
else:
self.feed = feed
self.feed = self.feed.save()
return FEED_ERRPARSE, ret_values
# the feed has changed (or it is the first time we parse it)
# saving the etag and last_modified fields
self.feed.etag = self.fpf.get('etag')
if self.feed.etag:
self.feed.etag = self.feed.etag[:255]
# some times this is None (it never should) *sigh*
if self.feed.etag is None:
self.feed.etag = ''
try:
self.feed.last_modified = mtime(self.fpf.modified)
except:
self.feed.last_modified = None
pass
self.fpf.entries = self.fpf.entries[:100]
if self.fpf.feed.get('title'):
self.feed.feed_title = strip_tags(self.fpf.feed.get('title'))
tagline = self.fpf.feed.get('tagline', self.feed.data.feed_tagline)
if tagline:
self.feed.data.feed_tagline = utf8encode(tagline)
self.feed.data.save()
if not self.feed.feed_link_locked:
self.feed.feed_link = self.fpf.feed.get('link') or self.fpf.feed.get('id') or self.feed.feed_link
self.feed = self.feed.save()
# Determine if stories aren't valid and replace broken guids
guids_seen = set()
permalinks_seen = set()
for entry in self.fpf.entries:
guids_seen.add(entry.get('guid'))
permalinks_seen.add(Feed.get_permalink(entry))
guid_difference = len(guids_seen) != len(self.fpf.entries)
single_guid = len(guids_seen) == 1
replace_guids = single_guid and guid_difference
permalink_difference = len(permalinks_seen) != len(self.fpf.entries)
single_permalink = len(permalinks_seen) == 1
replace_permalinks = single_permalink and permalink_difference
# Compare new stories to existing stories, adding and updating
start_date = datetime.datetime.utcnow()
story_hashes = []
stories = []
for entry in self.fpf.entries:
story = pre_process_story(entry)
if story.get('published') < start_date:
start_date = story.get('published')
if replace_guids:
if replace_permalinks:
new_story_guid = unicode(story.get('published'))
if self.options['verbose']:
logging.debug(u' ---> [%-30s] ~FBReplacing guid (%s) with timestamp: %s' % (
self.feed.title[:30],
story.get('guid'), new_story_guid))
story['guid'] = new_story_guid
else:
new_story_guid = Feed.get_permalink(story)
if self.options['verbose']:
logging.debug(u' ---> [%-30s] ~FBReplacing guid (%s) with permalink: %s' % (
self.feed.title[:30],
story.get('guid'), new_story_guid))
story['guid'] = new_story_guid
story['story_hash'] = MStory.feed_guid_hash_unsaved(self.feed.pk, story.get('guid'))
stories.append(story)
story_hashes.append(story.get('story_hash'))
existing_stories = dict((s.story_hash, s) for s in MStory.objects(
story_hash__in=story_hashes,
# story_date__gte=start_date,
# story_feed_id=self.feed.pk
))
ret_values = self.feed.add_update_stories(stories, existing_stories,
verbose=self.options['verbose'],
updates_off=self.options['updates_off'])
if (hasattr(self.fpf, 'feed') and
hasattr(self.fpf.feed, 'links') and self.fpf.feed.links):
hub_url = None
self_url = self.feed.feed_address
for link in self.fpf.feed.links:
if link['rel'] == 'hub' and not hub_url:
hub_url = link['href']
elif link['rel'] == 'self':
self_url = link['href']
push_expired = False
if self.feed.is_push:
try:
push_expired = self.feed.push.lease_expires < datetime.datetime.now()
except PushSubscription.DoesNotExist:
self.feed.is_push = False
if (hub_url and self_url and not settings.DEBUG and
self.feed.active_subscribers > 0 and
(push_expired or not self.feed.is_push or self.options.get('force'))):
logging.debug(u' ---> [%-30s] ~BB~FW%sSubscribing to PuSH hub: %s' % (
self.feed.title[:30],
"~SKRe-~SN" if push_expired else "", hub_url))
try:
PushSubscription.objects.subscribe(self_url, feed=self.feed, hub=hub_url)
except TimeoutError:
logging.debug(u' ---> [%-30s] ~BB~FW~FRTimed out~FW subscribing to PuSH hub: %s' % (
self.feed.title[:30], hub_url))
elif (self.feed.is_push and
(self.feed.active_subscribers <= 0 or not hub_url)):
logging.debug(u' ---> [%-30s] ~BB~FWTurning off PuSH, no hub found' % (
self.feed.title[:30]))
self.feed.is_push = False
self.feed = self.feed.save()
logging.debug(u' ---> [%-30s] ~FYParsed Feed: %snew=%s~SN~FY %sup=%s~SN same=%s%s~SN %serr=%s~SN~FY total=~SB%s' % (
self.feed.title[:30],
'~FG~SB' if ret_values['new'] else '', ret_values['new'],
'~FY~SB' if ret_values['updated'] else '', ret_values['updated'],
'~SB' if ret_values['same'] else '', ret_values['same'],
'~FR~SB' if ret_values['error'] else '', ret_values['error'],
len(self.fpf.entries)))
self.feed.update_all_statistics(full=bool(ret_values['new']), force=self.options['force'])
if ret_values['new']:
self.feed.trim_feed()
self.feed.expire_redis()
self.feed.save_feed_history(200, "OK")
if self.options['verbose']:
logging.debug(u' ---> [%-30s] ~FBTIME: feed parse in ~FM%.4ss' % (
self.feed.title[:30], time.time() - start))
return FEED_OK, ret_values
class Dispatcher:
def __init__(self, options, num_threads):
self.options = options
self.feed_stats = {
FEED_OK:0,
FEED_SAME:0,
FEED_ERRPARSE:0,
FEED_ERRHTTP:0,
FEED_ERREXC:0}
self.feed_trans = {
FEED_OK:'ok',
FEED_SAME:'unchanged',
FEED_ERRPARSE:'cant_parse',
FEED_ERRHTTP:'http_error',
FEED_ERREXC:'exception'}
self.feed_keys = sorted(self.feed_trans.keys())
self.num_threads = num_threads
self.time_start = datetime.datetime.utcnow()
self.workers = []
def refresh_feed(self, feed_id):
"""Update feed, since it may have changed"""
return Feed.objects.using('default').get(pk=feed_id)
def process_feed_wrapper(self, feed_queue):
delta = None
current_process = multiprocessing.current_process()
identity = "X"
feed = None
if current_process._identity:
identity = current_process._identity[0]
for feed_id in feed_queue:
start_duration = time.time()
feed_fetch_duration = None
feed_process_duration = None
page_duration = None
icon_duration = None
feed_code = None
ret_entries = None
start_time = time.time()
ret_feed = FEED_ERREXC
try:
feed = self.refresh_feed(feed_id)
skip = False
if self.options.get('fake'):
skip = True
weight = "-"
quick = "-"
rand = "-"
elif (self.options.get('quick') and not self.options['force'] and
feed.known_good and feed.fetched_once and not feed.is_push):
weight = feed.stories_last_month * feed.num_subscribers
random_weight = random.randint(1, max(weight, 1))
quick = float(self.options.get('quick', 0))
rand = random.random()
if random_weight < 100 and rand < quick:
skip = True
elif False and feed.feed_address.startswith("http://news.google.com/news"):
skip = True
weight = "-"
quick = "-"
rand = "-"
if skip:
logging.debug(' ---> [%-30s] ~BGFaking fetch, skipping (%s/month, %s subs, %s < %s)...' % (
feed.title[:30],
weight,
feed.num_subscribers,
rand, quick))
continue
ffeed = FetchFeed(feed_id, self.options)
ret_feed, fetched_feed = ffeed.fetch()
feed_fetch_duration = time.time() - start_duration
if ((fetched_feed and ret_feed == FEED_OK) or self.options['force']):
pfeed = ProcessFeed(feed_id, fetched_feed, self.options)
ret_feed, ret_entries = pfeed.process()
feed = pfeed.feed
feed_process_duration = time.time() - start_duration
if (ret_entries and ret_entries['new']) or self.options['force']:
start = time.time()
if not feed.known_good or not feed.fetched_once:
feed.known_good = True
feed.fetched_once = True
feed = feed.save()
if self.options['force'] or random.random() <= 0.02:
logging.debug(' ---> [%-30s] ~FBPerforming feed cleanup...' % (feed.title[:30],))
start_cleanup = time.time()
feed.sync_redis()
logging.debug(' ---> [%-30s] ~FBDone with feed cleanup. Took ~SB%.4s~SN sec.' % (feed.title[:30], time.time() - start_cleanup))
try:
self.count_unreads_for_subscribers(feed)
except TimeoutError:
logging.debug(' ---> [%-30s] Unread count took too long...' % (feed.title[:30],))
if self.options['verbose']:
logging.debug(u' ---> [%-30s] ~FBTIME: unread count in ~FM%.4ss' % (
feed.title[:30], time.time() - start))
except urllib2.HTTPError, e:
logging.debug(' ---> [%-30s] ~FRFeed throws HTTP error: ~SB%s' % (unicode(feed_id)[:30], e.fp.read()))
feed.save_feed_history(e.code, e.msg, e.fp.read())
fetched_feed = None
except Feed.DoesNotExist, e:
logging.debug(' ---> [%-30s] ~FRFeed is now gone...' % (unicode(feed_id)[:30]))
continue
except TimeoutError, e:
logging.debug(' ---> [%-30s] ~FRFeed fetch timed out...' % (feed.title[:30]))
feed.save_feed_history(505, 'Timeout', e)
feed_code = 505
fetched_feed = None
except Exception, e:
logging.debug('[%d] ! -------------------------' % (feed_id,))
tb = traceback.format_exc()
logging.error(tb)
logging.debug('[%d] ! -------------------------' % (feed_id,))
ret_feed = FEED_ERREXC
feed = Feed.get_by_id(getattr(feed, 'pk', feed_id))
if not feed: continue
feed.save_feed_history(500, "Error", tb)
feed_code = 500
fetched_feed = None
# mail_feed_error_to_admin(feed, e, local_vars=locals())
if (not settings.DEBUG and hasattr(settings, 'RAVEN_CLIENT') and
settings.RAVEN_CLIENT):
settings.RAVEN_CLIENT.captureException()
if not feed_code:
if ret_feed == FEED_OK:
feed_code = 200
elif ret_feed == FEED_SAME:
feed_code = 304
elif ret_feed == FEED_ERRHTTP:
feed_code = 400
if ret_feed == FEED_ERREXC:
feed_code = 500
elif ret_feed == FEED_ERRPARSE:
feed_code = 550
if not feed: continue
feed = self.refresh_feed(feed.pk)
if ((self.options['force']) or
(random.random() > .9) or
(fetched_feed and
feed.feed_link and
feed.has_page and
(ret_feed == FEED_OK or
(ret_feed == FEED_SAME and feed.stories_last_month > 10)))):
logging.debug(u' ---> [%-30s] ~FYFetching page: %s' % (feed.title[:30], feed.feed_link))
page_importer = PageImporter(feed)
try:
page_data = page_importer.fetch_page()
page_duration = time.time() - start_duration
except TimeoutError, e:
logging.debug(' ---> [%-30s] ~FRPage fetch timed out...' % (feed.title[:30]))
page_data = None
feed.save_page_history(555, 'Timeout', '')
except Exception, e:
logging.debug('[%d] ! -------------------------' % (feed_id,))
tb = traceback.format_exc()
logging.error(tb)
logging.debug('[%d] ! -------------------------' % (feed_id,))
feed.save_page_history(550, "Page Error", tb)
fetched_feed = None
page_data = None
# mail_feed_error_to_admin(feed, e, local_vars=locals())
if (not settings.DEBUG and hasattr(settings, 'RAVEN_CLIENT') and
settings.RAVEN_CLIENT):
settings.RAVEN_CLIENT.captureException()
feed = self.refresh_feed(feed.pk)
logging.debug(u' ---> [%-30s] ~FYFetching icon: %s' % (feed.title[:30], feed.feed_link))
force = self.options['force']
if random.random() > .99:
force = True
icon_importer = IconImporter(feed, page_data=page_data, force=force)
try:
icon_importer.save()
icon_duration = time.time() - start_duration
except TimeoutError, e:
logging.debug(' ---> [%-30s] ~FRIcon fetch timed out...' % (feed.title[:30]))
feed.save_page_history(556, 'Timeout', '')
except Exception, e:
logging.debug('[%d] ! -------------------------' % (feed_id,))
tb = traceback.format_exc()
logging.error(tb)
logging.debug('[%d] ! -------------------------' % (feed_id,))
# feed.save_feed_history(560, "Icon Error", tb)
# mail_feed_error_to_admin(feed, e, local_vars=locals())
if (not settings.DEBUG and hasattr(settings, 'RAVEN_CLIENT') and
settings.RAVEN_CLIENT):
settings.RAVEN_CLIENT.captureException()
else:
logging.debug(u' ---> [%-30s] ~FBSkipping page fetch: (%s on %s stories) %s' % (feed.title[:30], self.feed_trans[ret_feed], feed.stories_last_month, '' if feed.has_page else ' [HAS NO PAGE]'))
feed = self.refresh_feed(feed.pk)
delta = time.time() - start_time
feed.last_load_time = round(delta)
feed.fetched_once = True
try:
feed = feed.save()
except IntegrityError:
logging.debug(" ---> [%-30s] ~FRIntegrityError on feed: %s" % (feed.title[:30], feed.feed_address,))
if ret_entries and ret_entries['new']:
self.publish_to_subscribers(feed)
done_msg = (u'%2s ---> [%-30s] ~FYProcessed in ~FM~SB%.4ss~FY~SN (~FB%s~FY) [%s]' % (
identity, feed.title[:30], delta,
feed.pk, self.feed_trans[ret_feed],))
logging.debug(done_msg)
total_duration = time.time() - start_duration
MAnalyticsFetcher.add(feed_id=feed.pk, feed_fetch=feed_fetch_duration,
feed_process=feed_process_duration,
page=page_duration, icon=icon_duration,
total=total_duration, feed_code=feed_code)
self.feed_stats[ret_feed] += 1
if len(feed_queue) == 1:
return feed
# time_taken = datetime.datetime.utcnow() - self.time_start
def publish_to_subscribers(self, feed):
try:
r = redis.Redis(connection_pool=settings.REDIS_PUBSUB_POOL)
listeners_count = r.publish(str(feed.pk), 'story:new')
if listeners_count:
logging.debug(" ---> [%-30s] ~FMPublished to %s subscribers" % (feed.title[:30], listeners_count))
except redis.ConnectionError:
logging.debug(" ***> [%-30s] ~BMRedis is unavailable for real-time." % (feed.title[:30],))
def count_unreads_for_subscribers(self, feed):
user_subs = UserSubscription.objects.filter(feed=feed,
active=True,
user__profile__last_seen_on__gte=feed.unread_cutoff)\
.order_by('-last_read_date')
if not user_subs.count():
return
for sub in user_subs:
if not sub.needs_unread_recalc:
sub.needs_unread_recalc = True
sub.save()
if self.options['compute_scores']:
r = redis.Redis(connection_pool=settings.REDIS_STORY_HASH_POOL)
stories = MStory.objects(story_feed_id=feed.pk,
story_date__gte=feed.unread_cutoff)
stories = Feed.format_stories(stories, feed.pk)
story_hashes = r.zrangebyscore('zF:%s' % feed.pk, int(feed.unread_cutoff.strftime('%s')),
int(time.time() + 60*60*24))
missing_story_hashes = set(story_hashes) - set([s['story_hash'] for s in stories])
if missing_story_hashes:
missing_stories = MStory.objects(story_feed_id=feed.pk,
story_hash__in=missing_story_hashes)\
.read_preference(pymongo.ReadPreference.PRIMARY)
missing_stories = Feed.format_stories(missing_stories, feed.pk)
stories = missing_stories + stories
logging.debug(u' ---> [%-30s] ~FYFound ~SB~FC%s(of %s)/%s~FY~SN un-secondaried stories while computing scores' % (feed.title[:30], len(missing_stories), len(missing_story_hashes), len(stories)))
cache.set("S:%s" % feed.pk, stories, 60)
logging.debug(u' ---> [%-30s] ~FYComputing scores: ~SB%s stories~SN with ~SB%s subscribers ~SN(%s/%s/%s)' % (
feed.title[:30], len(stories), user_subs.count(),
feed.num_subscribers, feed.active_subscribers, feed.premium_subscribers))
self.calculate_feed_scores_with_stories(user_subs, stories)
elif self.options.get('mongodb_replication_lag'):
logging.debug(u' ---> [%-30s] ~BR~FYSkipping computing scores: ~SB%s seconds~SN of mongodb lag' % (
feed.title[:30], self.options.get('mongodb_replication_lag')))
@timelimit(10)
def calculate_feed_scores_with_stories(self, user_subs, stories):
for sub in user_subs:
silent = False if self.options['verbose'] >= 2 else True
sub.calculate_feed_scores(silent=silent, stories=stories)
def add_jobs(self, feeds_queue, feeds_count=1):
""" adds a feed processing job to the pool
"""
self.feeds_queue = feeds_queue
self.feeds_count = feeds_count
def run_jobs(self):
if self.options['single_threaded']:
return self.process_feed_wrapper(self.feeds_queue[0])
else:
for i in range(self.num_threads):
feed_queue = self.feeds_queue[i]
self.workers.append(multiprocessing.Process(target=self.process_feed_wrapper,
args=(feed_queue,)))
for i in range(self.num_threads):
self.workers[i].start()
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