/usr/lib/python2.7/dist-packages/duecredit/dueswitch.py is in python-duecredit 0.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# See COPYING file distributed along with the duecredit package for the
# copyright and license terms.
#
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"""Provides an adapter to switch between two (active, inactive) collectors
"""
import os
import atexit
from .log import lgr
from .utils import never_fail
def _get_duecredit_enable():
env_enable = os.environ.get('DUECREDIT_ENABLE', 'no')
if not env_enable.lower() in ('0', '1', 'yes', 'no', 'true', 'false'):
lgr.warning("Misunderstood value %s for DUECREDIT_ENABLE. "
"Use 'yes' or 'no', or '0' or '1'")
return env_enable.lower() in ('1', 'yes', 'true')
@never_fail
def _get_inactive_due():
# keeping duplicate but separate so later we could even place it into a separate
# submodule to possibly minimize startup time impact even more
from .collector import InactiveDueCreditCollector
return InactiveDueCreditCollector()
@never_fail
def _get_active_due():
from .config import CACHE_DIR, DUECREDIT_FILE
from duecredit.collector import CollectorSummary, DueCreditCollector
from .io import load_due
import atexit
# where to cache bibtex entries
if not os.path.exists(CACHE_DIR):
os.makedirs(CACHE_DIR)
# TODO: this needs to move to atexit handling, that we load previous
# one and them merge with new ones. Informative bits could be -- how
# many new citations we got
if os.path.exists(DUECREDIT_FILE):
try:
due_ = load_due(DUECREDIT_FILE)
except Exception as e:
lgr.warning("Failed to load previously collected %s. "
"DueCredit will not be active for this session."
% DUECREDIT_FILE)
return _get_inactive_due()
else:
due_ = DueCreditCollector()
return due_
class DueSwitch(object):
"""Adapter between two types of collectors -- Inactive and Active
Once activated though, cannot be fully deactivated since it would inject
duecredit decorators and register an event atexit.
"""
def __init__(self, inactive, active, activate=False):
self.__active = None
self.__collectors = {False: inactive, True: active}
self.__activations_done = False
self.activate(activate)
@property
def active(self):
return self.__active
@never_fail
def _dump_collector_summary(self):
from duecredit.collector import CollectorSummary
due_summary = CollectorSummary(self.__collectors[True])
due_summary.dump()
def __prepare_exit_and_injections(self):
# Wrapper to create and dump summary... passing method doesn't work:
# probably removes instance too early
atexit.register(self._dump_collector_summary)
# Deal with injector
from .injections import DueCreditInjector
injector = DueCreditInjector(collector=self.__collectors[True])
injector.activate()
@never_fail
def activate(self, activate=True):
# 1st step -- if activating/deactivating switch between the two collectors
if self.__active is not activate:
# we need to switch the state
is_public = lambda x: not x.startswith('_')
# Clean up current bindings first
for k in filter(is_public, dir(self)):
if k not in ('activate', 'active'):
delattr(self, k)
new_due = self.__collectors[activate]
for k in filter(is_public, dir(new_due)):
setattr(self, k, getattr(new_due, k))
self.__active = activate
# 2nd -- if activating, we might still need to have activations done
if activate and not self.__activations_done:
try:
self.__prepare_exit_and_injections()
except Exception as e:
lgr.error("Failed to prepare injections etc: %s" % str(e))
finally:
self.__activations_done = True
due = DueSwitch(_get_inactive_due(), _get_active_due(), _get_duecredit_enable())
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