458 lines
16 KiB
Python
458 lines
16 KiB
Python
from contextlib import contextmanager
|
|
from redis import StrictRedis
|
|
from woodwind.models import Feed, Entry
|
|
from woodwind import util
|
|
from flask import Config as FlaskConfig
|
|
import bs4
|
|
import datetime
|
|
import feedparser
|
|
import json
|
|
import logging
|
|
import mf2py
|
|
import mf2util
|
|
import re
|
|
import requests
|
|
import rq
|
|
import sqlalchemy
|
|
import sqlalchemy.orm
|
|
import sys
|
|
import time
|
|
import urllib.parse
|
|
|
|
config = FlaskConfig('/home/kmahan/projects/woodwind')
|
|
config.from_pyfile('/home/kmahan/projects/woodwind.cfg')
|
|
|
|
# normal update interval for polling feeds
|
|
UPDATE_INTERVAL = datetime.timedelta(hours=1)
|
|
# update interval when polling feeds that are push verified
|
|
UPDATE_INTERVAL_PUSH = datetime.timedelta(days=1)
|
|
|
|
TWITTER_RE = re.compile(
|
|
r'https?://(?:www\.|mobile\.)?twitter\.com/(\w+)/status(?:es)?/(\w+)')
|
|
TAG_RE = re.compile(r'</?\w+[^>]*?>')
|
|
COMMENT_RE = re.compile(r'<!--[^>]*?-->')
|
|
|
|
AUDIO_ENCLOSURE_TMPL = '<p><audio class="u-audio" src="{href}" controls '\
|
|
'preload=none ><a href="{href}">audio</a></audio></p>'
|
|
VIDEO_ENCLOSURE_TMPL = '<p><video class="u-video" src="{href}" controls '\
|
|
'preload=none ><a href="{href}">video</a></video></p>'
|
|
|
|
logger = logging.getLogger(__name__)
|
|
logger.setLevel(logging.DEBUG)
|
|
logger.addHandler(logging.StreamHandler(sys.stdout))
|
|
|
|
engine = sqlalchemy.create_engine(config['SQLALCHEMY_DATABASE_URI'])
|
|
|
|
Session = sqlalchemy.orm.sessionmaker(bind=engine)
|
|
redis = StrictRedis()
|
|
|
|
q_high = rq.Queue('high', connection=redis)
|
|
q = rq.Queue('low', connection=redis)
|
|
|
|
|
|
@contextmanager
|
|
def session_scope():
|
|
"""Provide a transactional scope around a series of operations."""
|
|
session = Session()
|
|
try:
|
|
yield session
|
|
session.commit()
|
|
except:
|
|
session.rollback()
|
|
raise
|
|
finally:
|
|
session.close()
|
|
|
|
|
|
def tick():
|
|
"""Checks all feeds to see if any of them are ready for an update.
|
|
Makes use of uWSGI timers to run every 5 minutes, without needing
|
|
a separate process to fire ticks.
|
|
"""
|
|
with session_scope() as session:
|
|
now = datetime.datetime.utcnow()
|
|
logger.info('Tick {}'.format(now))
|
|
for feed in session.query(Feed).all():
|
|
logger.debug('Feed {} last checked {}'.format(
|
|
feed, feed.last_checked))
|
|
if (not feed.last_checked
|
|
or (not feed.push_verified
|
|
and now - feed.last_checked > UPDATE_INTERVAL)
|
|
or (feed.push_verified
|
|
and now - feed.last_checked > UPDATE_INTERVAL_PUSH)):
|
|
q.enqueue(update_feed, feed.id)
|
|
|
|
|
|
def update_feed(feed_id, content=None, is_polling=True):
|
|
with session_scope() as session:
|
|
feed = session.query(Feed).get(feed_id)
|
|
logger.info('Updating {}'.format(feed))
|
|
|
|
now = datetime.datetime.utcnow()
|
|
new_entries = []
|
|
try:
|
|
if content:
|
|
logger.info('using provided content. size=%d', len(content))
|
|
else:
|
|
logger.info('fetching feed: %s', feed)
|
|
response = requests.get(feed.feed)
|
|
if response.status_code // 100 != 2:
|
|
logger.warn('bad response from %s. %r: %r', feed.feed,
|
|
response, response.text)
|
|
return
|
|
if is_polling:
|
|
check_push_subscription(session, feed, response)
|
|
content = get_response_content(response)
|
|
|
|
# backfill if this is the first pull
|
|
backfill = len(feed.entries) == 0
|
|
if feed.type == 'xml':
|
|
result = process_xml_feed_for_new_entries(
|
|
session, feed, content, backfill, now)
|
|
elif feed.type == 'html':
|
|
result = process_html_feed_for_new_entries(
|
|
session, feed, content, backfill, now)
|
|
else:
|
|
result = []
|
|
|
|
for entry in result:
|
|
old = session.query(Entry)\
|
|
.filter(Entry.feed == feed)\
|
|
.filter(Entry.uid == entry.uid).first()
|
|
# have we seen this post before
|
|
if not old or not is_content_equal(old, entry):
|
|
# set a default value for published if none is provided
|
|
if not entry.published:
|
|
entry.published = (old and old.published) or now
|
|
if old:
|
|
# if we're updating an old entriy, use the original
|
|
# retrieved time
|
|
entry.retrieved = old.retrieved
|
|
feed.entries.remove(old)
|
|
# punt on deleting for now, learn about cascade
|
|
# and stuff later
|
|
# session.delete(old)
|
|
|
|
feed.entries.append(entry)
|
|
session.commit()
|
|
new_entries.append(entry)
|
|
else:
|
|
logger.debug(
|
|
'skipping previously seen post %s', old.permalink)
|
|
|
|
for entry in new_entries:
|
|
for in_reply_to in entry.get_property('in-reply-to', []):
|
|
fetch_reply_context(entry.id, in_reply_to, now)
|
|
|
|
finally:
|
|
if is_polling:
|
|
feed.last_checked = now
|
|
if new_entries:
|
|
feed.last_updated = now
|
|
session.commit()
|
|
if new_entries:
|
|
notify_feed_updated(session, feed, new_entries)
|
|
|
|
|
|
def check_push_subscription(session, feed, response):
|
|
def build_callback_url():
|
|
return '{}://{}/_notify/{}'.format(
|
|
getattr(config, 'PREFERRED_URL_SCHEME', 'http'),
|
|
config['SERVER_NAME'],
|
|
feed.id)
|
|
|
|
def send_request(mode, hub, topic):
|
|
logger.debug(
|
|
'sending %s request for hub=%r, topic=%r', mode, hub, topic)
|
|
r = requests.post(hub, data={
|
|
'hub.mode': mode,
|
|
'hub.topic': topic,
|
|
'hub.callback': build_callback_url(),
|
|
'hub.secret': feed.get_or_create_push_secret(),
|
|
'hub.verify': 'sync', # backcompat with 0.3
|
|
# TODO secret should only be used over HTTPS
|
|
# 'hub.secret': secret,
|
|
})
|
|
logger.debug('%s response %r', mode, r)
|
|
|
|
expiry = feed.push_expiry
|
|
old_hub = feed.push_hub
|
|
old_topic = feed.push_topic
|
|
hub = response.links.get('hub', {}).get('url')
|
|
topic = response.links.get('self', {}).get('url')
|
|
|
|
logger.debug('link headers. links=%s, hub=%s, topic=%s',
|
|
response.links, hub, topic)
|
|
if not hub or not topic:
|
|
# try to find link rel elements
|
|
if feed.type == 'html':
|
|
soup = bs4.BeautifulSoup(get_response_content(response))
|
|
if not hub:
|
|
hub_link = soup.find('link', rel='hub')
|
|
hub = hub_link and hub_link.get('href')
|
|
if not topic:
|
|
self_link = soup.find('link', rel='self')
|
|
topic = self_link and self_link.get('href')
|
|
elif feed.type == 'xml':
|
|
parsed = feedparser.parse(get_response_content(response))
|
|
links = parsed.feed.get('links')
|
|
if links:
|
|
if not hub:
|
|
hub = next((link['href'] for link in links
|
|
if 'hub' in link['rel']), None)
|
|
if not topic:
|
|
topic = next((link['href'] for link in links
|
|
if 'self' in link['rel']), None)
|
|
|
|
if ((expiry and expiry - datetime.datetime.utcnow()
|
|
<= UPDATE_INTERVAL_PUSH)
|
|
or hub != old_hub or topic != old_topic or not feed.push_verified):
|
|
feed.push_hub = hub
|
|
feed.push_topic = topic
|
|
feed.push_verified = False
|
|
feed.push_expiry = None
|
|
session.commit()
|
|
|
|
if old_hub and old_topic and hub != old_hub and topic != old_topic:
|
|
send_request('unsubscribe', old_hub, old_topic)
|
|
|
|
if hub and topic:
|
|
send_request('subscribe', hub, topic)
|
|
|
|
session.commit()
|
|
|
|
|
|
def notify_feed_updated(session, feed, entries):
|
|
"""Render the new entries and publish them to redis
|
|
"""
|
|
from . import create_app
|
|
from flask import render_template
|
|
import flask.ext.login as flask_login
|
|
flask_app = create_app()
|
|
|
|
entries = sorted(entries, key=lambda e: (e.retrieved, e.published),
|
|
reverse=True)
|
|
|
|
for user in feed.users:
|
|
with flask_app.test_request_context():
|
|
flask_login.login_user(user, remember=True)
|
|
message = json.dumps({
|
|
'user': user.id,
|
|
'feed': feed.id,
|
|
'entries': [
|
|
render_template('_entry.jinja2', feed=feed, entry=e)
|
|
for e in entries
|
|
],
|
|
})
|
|
for topic in 'user:{}'.format(user.id), 'feed:{}'.format(feed.id):
|
|
redis.publish('woodwind_notify:{}'.format(topic), message)
|
|
|
|
|
|
def is_content_equal(e1, e2):
|
|
"""The criteria for determining if an entry that we've seen before
|
|
has been updated. If any of these fields have changed, we'll scrub the
|
|
old entry and replace it with the updated one.
|
|
"""
|
|
def normalize(content):
|
|
"""Strip HTML tags, added to prevent a specific case where Wordpress
|
|
syntax highlighting (crayon) generates slightly different
|
|
markup every time it's called.
|
|
"""
|
|
if content:
|
|
content = TAG_RE.sub('', content)
|
|
content = COMMENT_RE.sub('', content)
|
|
return content
|
|
|
|
return (e1.title == e2.title
|
|
and normalize(e1.content) == normalize(e2.content)
|
|
and e1.author_name == e2.author_name
|
|
and e1.author_url == e2.author_url
|
|
and e1.author_photo == e2.author_photo
|
|
and e1.properties == e2.properties)
|
|
|
|
|
|
def process_xml_feed_for_new_entries(session, feed, content, backfill, now):
|
|
logger.debug('fetching xml feed: %s', feed)
|
|
|
|
parsed = feedparser.parse(content)
|
|
feed_props = parsed.get('feed', {})
|
|
default_author_url = feed_props.get('author_detail', {}).get('href')
|
|
default_author_name = feed_props.get('author_detail', {}).get('name')
|
|
default_author_photo = feed_props.get('logo')
|
|
|
|
logger.debug('found {} entries'.format(len(parsed.entries)))
|
|
|
|
# work from the bottom up (oldest first, usually)
|
|
for p_entry in reversed(parsed.entries):
|
|
logger.debug('processing entry {}'.format(str(p_entry)[:256]))
|
|
permalink = p_entry.get('link')
|
|
uid = p_entry.get('id') or permalink
|
|
|
|
if not uid:
|
|
continue
|
|
|
|
if 'updated_parsed' in p_entry:
|
|
updated = datetime.datetime.fromtimestamp(
|
|
time.mktime(p_entry.updated_parsed))
|
|
else:
|
|
updated = None
|
|
|
|
if 'published_parsed' in p_entry:
|
|
published = datetime.datetime.fromtimestamp(
|
|
time.mktime(p_entry.published_parsed))
|
|
else:
|
|
published = updated
|
|
|
|
retrieved = now
|
|
if backfill and published:
|
|
retrieved = published
|
|
|
|
title = p_entry.get('title')
|
|
|
|
content = None
|
|
content_list = p_entry.get('content')
|
|
if content_list:
|
|
content = content_list[0].value
|
|
else:
|
|
content = p_entry.get('summary')
|
|
|
|
if title and content:
|
|
title_trimmed = title.rstrip('...').rstrip('…')
|
|
if content.startswith(title_trimmed):
|
|
title = None
|
|
|
|
for link in p_entry.get('links', []):
|
|
if link.type == 'audio/mpeg':
|
|
audio = AUDIO_ENCLOSURE_TMPL.format(href=link.get('href'))
|
|
content = audio + (content or '')
|
|
if (link.type == 'video/x-m4v'
|
|
or link.type == 'video/x-mp4'
|
|
or link.type == 'video/mp4'):
|
|
video = VIDEO_ENCLOSURE_TMPL.format(href=link.get('href'))
|
|
content = video + (content or '')
|
|
|
|
entry = Entry(
|
|
published=published,
|
|
updated=updated,
|
|
uid=uid,
|
|
permalink=permalink,
|
|
retrieved=retrieved,
|
|
title=p_entry.get('title'),
|
|
content=content,
|
|
content_cleaned=util.clean(content),
|
|
author_name=p_entry.get('author_detail', {}).get('name')
|
|
or default_author_name,
|
|
author_url=p_entry.get('author_detail', {}).get('href')
|
|
or default_author_url,
|
|
author_photo=default_author_photo
|
|
or fallback_photo(feed.origin))
|
|
|
|
yield entry
|
|
|
|
|
|
def process_html_feed_for_new_entries(session, feed, content, backfill, now):
|
|
parsed = mf2util.interpret_feed(
|
|
mf2py.parse(url=feed.feed, doc=content), feed.feed)
|
|
hfeed = parsed.get('entries', [])
|
|
|
|
for hentry in hfeed:
|
|
entry = hentry_to_entry(hentry, feed, backfill, now)
|
|
if entry:
|
|
logger.debug('built entry: %s', entry.permalink)
|
|
yield entry
|
|
|
|
|
|
def hentry_to_entry(hentry, feed, backfill, now):
|
|
permalink = url = hentry.get('url')
|
|
uid = hentry.get('uid') or url
|
|
if not uid:
|
|
return
|
|
|
|
# hentry = mf2util.interpret(mf2py.Parser(url=url).to_dict(), url)
|
|
# permalink = hentry.get('url') or url
|
|
# uid = hentry.get('uid') or uid
|
|
|
|
title = hentry.get('name')
|
|
content = hentry.get('content')
|
|
if not content:
|
|
content = title
|
|
title = None
|
|
|
|
published = hentry.get('published')
|
|
updated = hentry.get('updated')
|
|
|
|
# retrieved time is now unless we're backfilling old posts
|
|
retrieved = now
|
|
if backfill and published:
|
|
retrieved = published
|
|
|
|
entry = Entry(
|
|
uid=uid,
|
|
retrieved=retrieved,
|
|
permalink=permalink,
|
|
published=published,
|
|
updated=updated,
|
|
title=title,
|
|
content=content,
|
|
content_cleaned=util.clean(content),
|
|
author_name=hentry.get('author', {}).get('name'),
|
|
author_photo=hentry.get('author', {}).get('photo')
|
|
or (feed and fallback_photo(feed.origin)),
|
|
author_url=hentry.get('author', {}).get('url'))
|
|
|
|
for prop in 'in-reply-to', 'like-of', 'repost-of', 'syndication':
|
|
value = hentry.get(prop)
|
|
if value:
|
|
entry.set_property(prop, value)
|
|
|
|
return entry
|
|
|
|
|
|
def fetch_reply_context(entry_id, in_reply_to, now):
|
|
with session_scope() as session:
|
|
entry = session.query(Entry).get(entry_id)
|
|
context = session.query(Entry)\
|
|
.filter_by(permalink=in_reply_to).first()
|
|
|
|
if not context:
|
|
logger.info('fetching in-reply-to url: %s', in_reply_to)
|
|
parsed = mf2util.interpret(
|
|
mf2py.parse(url=proxy_url(in_reply_to)), in_reply_to)
|
|
if parsed:
|
|
context = hentry_to_entry(parsed, in_reply_to, False, now)
|
|
|
|
if context:
|
|
entry.reply_context.append(context)
|
|
session.commit()
|
|
|
|
|
|
def proxy_url(url):
|
|
if config['TWITTER_AU_KEY'] and config['TWITTER_AU_SECRET']:
|
|
# swap out the a-u url for twitter urls
|
|
match = TWITTER_RE.match(url)
|
|
if match:
|
|
proxy_url = (
|
|
'https://twitter-activitystreams.appspot.com/@me/@all/@app/{}?'
|
|
.format(match.group(2)) + urllib.parse.urlencode({
|
|
'format': 'html',
|
|
'access_token_key': config['TWITTER_AU_KEY'],
|
|
'access_token_secret': config['TWITTER_AU_SECRET'],
|
|
}))
|
|
logger.debug('proxied twitter url %s', proxy_url)
|
|
return proxy_url
|
|
return url
|
|
|
|
|
|
def fallback_photo(url):
|
|
"""Use favatar to find an appropriate photo for any URL"""
|
|
domain = urllib.parse.urlparse(url).netloc
|
|
return 'http://www.google.com/s2/favicons?domain=' + domain
|
|
|
|
|
|
def get_response_content(response):
|
|
"""Kartik's trick for handling responses that don't specify their
|
|
encoding. Response.text will guess badly if they don't.
|
|
"""
|
|
if 'charset' not in response.headers.get('content-type', ''):
|
|
return response.content
|
|
return response.text
|