def _init_performance_ticker(self, logger):
self.performance_ticker = SessionPerformanceTicker(logger)
self.performance_ticker.start()
self._last_safe_save_time = time.time()
class SingleSessionWorker(AbstractWorker):
"""
this class reads stream of messages from RabbitMQ and dump them to the MongoDB
"""
# every 15 minutes worker will perform <safe=True> save to Mongo DB
# this allows to catch MongoDB connection expiration
SAFE_SAVE_INTERVAL = 900
def __init__(self, process_name):
super(SingleSessionWorker, self).__init__(process_name)
# ********************** abstract methods ****************************
def _init_performance_ticker(self, logger):
self.performance_ticker = SessionPerformanceTicker(logger)
self.performance_ticker.start()
self._last_safe_save_time = time.time()
def _mq_callback(self, message):
""" wraps call of abstract method with try/except
in case exception breaks the abstract method, this method:
- catches the exception
- logs the exception
- marks unit of work as INVALID"""
try:
single_session_collection = CollectionContext.get_collection(self.logger, COLLECTION_SINGLE_SESSION)
raw_data = RawData(message.body)
query = {AbstractModel.DOMAIN_NAME: raw_data.get_key()[0],
AbstractModel.FAMILY_USER_PROFILE + '.' + AbstractModel.SESSION_ID: raw_data.get_session_id()}
document = single_session_collection.find_one(query)
if document is None:
# insert the record
session = SingleSessionStatistics()
# input data constraints - both session_id and user_id must be present in MQ message
session.composite_key(raw_data.get_key()[0], time_helper.raw_to_session(raw_data.get_key()[1]))
session.set_session_id(raw_data.get_session_id())
session.set_ip(raw_data.get_ip())
session.set_total_duration(0)
session = self.update_session_body(raw_data, session)
self.add_entry(session, 0, raw_data)
self.performance_ticker.increment_insert()
else:
# update the click_xxx info
session = SingleSessionStatistics(document)
session = self.update_session_body(raw_data, session)
duration = raw_data.get_key()[1] - time_helper.session_to_epoch(session.get_key()[1])
session.set_total_duration(duration)
index = session.get_number_of_entries()
self.add_entry(session, index, raw_data)
self.performance_ticker.increment_update()
if time.time() - self._last_safe_save_time < self.SAFE_SAVE_INTERVAL:
isSafe = False
else:
isSafe = True
self._last_safe_save_time = time.time()
single_session_collection.save(session.get_document(), safe=isSafe)
self.consumer.acknowledge(message.delivery_tag)
except AutoReconnect as e:
self.logger.error('MongoDB connection error: %r\nRe-queueing message & exiting the worker' % e)
self.consumer.reject(message.delivery_tag)
raise e
except (KeyError, IndexError) as e:
self.logger.error('Error is considered Unrecoverable: %r\nCancelled message: %r' % (e, message.body))
self.consumer.cancel(message.delivery_tag)
except Exception as e:
self.logger.error('Error is considered Recoverable: %r\nRe-queueing message: %r' % (e, message.body))
self.consumer.reject(message.delivery_tag)
def update_session_body(self, raw_data, session):
if raw_data.get_browser() is not None:
session.set_browser(raw_data.get_browser())
if raw_data.get_screen_res()[0] is not None and raw_data.get_screen_res()[1] is not None:
session.set_screen_res(raw_data.get_screen_res()[0], raw_data.get_screen_res()[1])
if raw_data.get_os() is not None:
session.set_os(raw_data.get_os())
if raw_data.get_language() is not None:
session.set_language(raw_data.get_language())
if raw_data.get_country() is not None:
session.set_country(raw_data.get_country())
number_of_pageviews = session.get_number_of_pageviews()
if number_of_pageviews is None:
number_of_pageviews = 0
if raw_data.is_page_view():
number_of_pageviews += 1
session.set_number_of_pageviews(number_of_pageviews)
return session
def add_entry(self, session, index, raw_data):
session.set_number_of_entries(index + 1)
session.set_entry_timestamp(index, time_helper.raw_to_session(raw_data.get_key()[1]))
