def main():
feeds_file_input = os.path.abspath('config/feed_list.json')
db_config_file = os.path.abspath('config/db_config.json')
config_handler = ConfigHandler(feeds_file_input, db_config_file)
uri, db_name, feeds_name_collection, feeds_collection, image_collection = config_handler.get_db_config(
)
db_context = DbContext(uri, db_name, feeds_name_collection,
feeds_collection, image_collection)
Logger.log('reading {0} ...'.format(feeds_file_input))
feed_list, feed_list_jsondata = config_handler.load_feed_list()
Logger.log('collecting from {0} feeds'.format(len(feed_list)))
Logger.log('inserting the feed list into the database...')
for feed in feed_list_jsondata:
db_context.feeds_name_collection.update_one({'url': feed['url']},
{'$set': feed},
upsert=True)
images_path_file = 'config/image_collection.json'
images_path = config_handler.load_image_collection_path(images_path_file)
scraper = Scraper(feed_list, images_path)
entries = scraper.get_entries()
# get the metadata in interest and the images
with Pool() as pool:
metadata = pool.map(scraper.get_metadata, entries)
Logger.log('inserting metadata into the database...')
for feed_data in metadata:
db_context.feeds_collection.update_one({'link': feed_data['link']},
{'$set': feed_data},
upsert=True)
#db_context.feeds_collection.update_many(metadata, {'$set': metadata}, upsert=True)
metadata_number = db_context.feeds_collection.find({}).count()
Logger.log('{0} metadata inserted'.format(metadata_number))
Logger.log('creating indexes...')
# compound index
db_context.feeds_collection.create_index([('title', pymongo.TEXT),
('summary', pymongo.TEXT)],
default_language='english',
name='title_summary_index')
db_context.feeds_collection.create_index([("image_path", pymongo.ASCENDING)
])
Logger.log('downloading the images...')
scraper.download_images(metadata, images_path)
Logger.log('inserting image collection path into the database...')
full_img_path = scraper.download_dir
data = {'path': full_img_path}
db_context.image_collection.update_one(data, {'$set': data}, upsert=True)
Logger.log('all done.\n')
class UpdateMonitor:
def __init__(self, feeds_file_input, db_config_file):
self.config_handler = ConfigHandler(feeds_file_input, db_config_file)
URI, db_name, feeds_name_collection, feeds_collection, image_collection = self.config_handler.get_db_config(
)
self.db_context = DbContext(URI, db_name, feeds_name_collection,
feeds_collection, image_collection)
def get_intervals(self, feed_url):
pass
# simple HTTP request header checking does not work for the update_interval calculation
"""
response = requests.get(feed_url)
if 'Last-Modified' in response.headers:
build_date = response.headers['Last-Modified']
print(build_date)
data = {'Last-Modified': build_date, 'expires': -1, 'Cache-Control': 'must-revalidate'}
resp = requests.get(feed_url, params=data)
#date = 'Fri, 4 Aug 2017 23:00:00 GMT'
#resp = requests.get(feed_url, params={'If-Modified-Since': build_date})
print(resp)
update_interval = ''
"""
feed = feedparser.parse(feed_url)
if 'updated' in feed['channel']:
try:
build_date = datetime.strptime(feed['channel']['updated'],
'%a, %d %b %Y %H:%M:%S %z')
except ValueError:
build_date = feed['channel']['updated']
update_interval = 0
elif 'sy_updateperiod' in feed['channel']:
period = feed['channel']['sy_updateperiod']
if period == 'hourly':
update_interval = 60
else:
update_interval = 0
response = requests.get(feed_url)
if 'Last-Modified' in response.headers:
build_date = datetime.strptime(
response.headers['Last-Modified'],
'%a, %d %b %Y %H:%M:%S %z')
else:
build_date = 0
else:
# if no updatePeriod is defined then the feed's build date refreshes with every request
build_date = 0
update_interval = 0
if 'ttl' in feed['channel']:
# ttl - time to live (minutes): http://www.rssboard.org/rss-specification#ltttlgtSubelementOfLtchannelgt
update_interval = int(feed['channel']['ttl'])
print('\tlast updated on: {0}'.format(build_date))
print('\tupdate interval: {0}'.format(update_interval))
return update_interval, build_date
def check_feeds(self):
feed_list, feeds_data = self.config_handler.load_feed_list()
for feed in feed_list:
print(feed)
update_interval, build_date = self.get_intervals(feed)
self.db_context.feeds_name_collection.update_one({'url': feed}, {
'$set': {
'update_interval': update_interval,
'build_date': build_date
}
},
upsert=True)
print()
def reload_feed(self, feed_name):
"""
should the feed be reloaded
"""
feed = self.db_context.feeds_name_collection.find_one(
{'url': feed_name})
build_date = feed['build_date']
update_interval = feed['update_interval']
time_now = datetime.utcnow()
difference = datetime(build_date) + datetime(
update_interval) - time_now
if build_date + update_interval > time_now:
return True
return False
