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import time
import conf
import json
import logging
import requests
import feedparser
import dateutil.parser
from functools import wraps
from datetime import datetime
from concurrent.futures import ThreadPoolExecutor
from requests_futures.sessions import FuturesSession
from pyaggr3g470r.lib.utils import default_handler
logger = logging.getLogger(__name__)
API_ROOT = "api/v2.0/"
def extract_id(entry, keys=[('link', 'link'),
('published', 'retrieved_date'),
('updated', 'retrieved_date')], force_id=False):
entry_id = entry.get('entry_id') or entry.get('id')
if entry_id:
return {'entry_id': entry_id}
if not entry_id and force_id:
entry_id = hash("".join(entry[entry_key] for _, entry_key in keys
if entry_key in entry))
else:
ids = {}
for entry_key, pyagg_key in keys:
if entry_key in entry and pyagg_key not in ids:
ids[pyagg_key] = entry[entry_key]
if 'date' in pyagg_key:
ids[pyagg_key] = dateutil.parser.parse(ids[pyagg_key])\
.isoformat()
return ids
class AbstractCrawler:
__session__ = None
__counter__ = 0
def __init__(self, auth):
self.auth = auth
self.session = self.get_session()
self.url = conf.PLATFORM_URL
@classmethod
def get_session(cls):
if cls.__session__ is None:
cls.__session__ = FuturesSession(
executor=ThreadPoolExecutor(max_workers=conf.NB_WORKER))
cls.__session__.verify = False
return cls.__session__
@classmethod
def count_on_me(cls, func):
@wraps(func)
def wrapper(*args, **kwargs):
cls.__counter__ += 1
result = func(*args, **kwargs)
cls.__counter__ -= 1
return result
return wrapper
def query_pyagg(self, method, urn, data=None):
if data is None:
data = {}
method = getattr(self.session, method)
return method("%s%s%s" % (self.url, API_ROOT, urn),
auth=self.auth, data=json.dumps(data,
default=default_handler),
headers={'Content-Type': 'application/json'})
@classmethod
def wait(self):
time.sleep(1)
while self.__counter__:
time.sleep(1)
class PyAggUpdater(AbstractCrawler):
def __init__(self, feed, entries, headers, auth):
self.feed = feed
self.entries = entries
self.headers = headers
super(PyAggUpdater, self).__init__(auth)
def to_article(self, entry):
date = datetime.now()
for date_key in ('published', 'updated'):
if entry.get(date_key):
try:
date = dateutil.parser.parse(entry[date_key])
except Exception:
pass
else:
break
content = ''
if entry.get('content'):
content = entry['content'][0]['value']
elif entry.get('summary'):
content = entry['summary']
return {'feed_id': self.feed['id'],
'entry_id': extract_id(entry).get('entry_id', None),
'link': entry.get('link', self.feed['site_link']),
'title': entry.get('title', 'No title'),
'readed': False, 'like': False,
'content': content,
'retrieved_date': date.isoformat(),
'date': date.isoformat()}
@AbstractCrawler.count_on_me
def callback(self, response):
results = response.result().json()
logger.debug('%r %r - %d entries were not matched and will be created',
self.feed['id'], self.feed['title'], len(results))
for id_to_create in results:
entry = self.entries[tuple(sorted(id_to_create.items()))]
logger.info('creating %r - %r', entry['title'], id_to_create)
self.query_pyagg('post', 'article', self.to_article(entry))
now = datetime.now()
logger.debug('%r %r - updating feed etag %r last_mod %r',
self.feed['id'], self.feed['title'],
self.headers.get('etag'), now)
self.query_pyagg('put', 'feed/%d' % self.feed['id'], {'error_count': 0,
'etag': self.headers.get('etag', ''),
'last_error': '',
'last_modified': self.headers.get('last-modified', '')})
class FeedCrawler(AbstractCrawler):
def __init__(self, feed, auth):
self.feed = feed
super(FeedCrawler, self).__init__(auth)
@AbstractCrawler.count_on_me
def callback(self, response):
try:
response = response.result()
response.raise_for_status()
except Exception as error:
error_count = self.feed['error_count'] + 1
logger.warn('%r %r - an error occured while fetching feed; bumping'
' error count to %r', self.feed['id'],
self.feed['title'], error_count)
self.query_pyagg('put', 'feed/%d' % self.feed['id'],
{'error_count': error_count,
'last_error': str(error)})
return
if response.status_code == 304:
logger.info("%r %r - feed responded with 304",
self.feed['id'], self.feed['title'])
return
if self.feed['etag'] and response.headers.get('etag') \
and response.headers.get('etag') == self.feed['etag']:
logger.info("%r %r - feed responded with same etag (%d)",
self.feed['id'], self.feed['title'],
response.status_code)
return
ids, entries = [], {}
parsed_response = feedparser.parse(response.text)
for entry in parsed_response['entries']:
entries[tuple(sorted(extract_id(entry).items()))] = entry
ids.append(extract_id(entry))
logger.debug('%r %r - found %d entries %r',
self.feed['id'], self.feed['title'], len(ids), ids)
future = self.query_pyagg('get', 'articles/challenge', {'ids': ids})
updater = PyAggUpdater(self.feed, entries, response.headers, self.auth)
future.add_done_callback(updater.callback)
class CrawlerScheduler(AbstractCrawler):
def __init__(self, username, password):
self.auth = (username, password)
super(CrawlerScheduler, self).__init__(self.auth)
def prepare_headers(self, feed):
headers = {}
if feed.get('etag', None):
headers['If-None-Match'] = feed['etag']
if feed.get('last_modified'):
headers['If-Modified-Since'] = feed['last_modified']
logger.debug('%r %r - calculated headers %r',
feed['id'], feed['title'], headers)
return headers
@AbstractCrawler.count_on_me
def callback(self, response):
response = response.result()
response.raise_for_status()
feeds = response.json()
logger.debug('%d to fetch %r', len(feeds), feeds)
for feed in feeds:
logger.info('%r %r - fetching resources',
feed['id'], feed['title'])
future = self.session.get(feed['link'],
headers=self.prepare_headers(feed))
future.add_done_callback(FeedCrawler(feed, self.auth).callback)
@AbstractCrawler.count_on_me
def run(self, **kwargs):
logger.debug('retreving fetchable feed')
future = self.query_pyagg('get', 'feeds/fetchable', kwargs)
future.add_done_callback(self.callback)
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