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"""Custom django signals defined for the askbot forum application.
"""
import django.dispatch
from django.db.models.signals import pre_save, post_save, pre_delete, post_delete, post_syncdb
try:
from django.db.models.signals import m2m_changed
except ImportError:
pass
tags_updated = django.dispatch.Signal(
providing_args=['tags', 'user', 'timestamp']
)
#todo: this one seems to be unused
edit_question_or_answer = django.dispatch.Signal(
providing_args=['instance', 'modified_by']
)
delete_question_or_answer = django.dispatch.Signal(
providing_args=['instance', 'deleted_by']
)
flag_offensive = django.dispatch.Signal(providing_args=['instance', 'mark_by'])
remove_flag_offensive = django.dispatch.Signal(providing_args=['instance', 'mark_by'])
user_updated = django.dispatch.Signal(providing_args=['instance', 'updated_by'])
user_registered = django.dispatch.Signal(providing_args=['user',])
#todo: move this to authentication app
user_logged_in = django.dispatch.Signal(providing_args=['session'])
new_answer_posted = django.dispatch.Signal(
providing_args=['answer', 'user', 'form_data']
)
new_question_posted = django.dispatch.Signal(
providing_args=['question', 'user', 'form_data']
)
answer_edited = django.dispatch.Signal(
providing_args=['answer', 'user', 'form_data']
)
post_updated = django.dispatch.Signal(
providing_args=[
'post',
'updated_by',
'newly_mentioned_users'
]
)
post_revision_published = django.dispatch.Signal(
providing_args = [
'revision',
'was_approved'
]
)
site_visited = django.dispatch.Signal(providing_args=['user', 'timestamp'])
def pop_signal_receivers(signal):
"""disables a given signal by removing listener functions
and returns the list
"""
receivers = signal.receivers
signal.receivers = list()
return receivers
def set_signal_receivers(signal, receiver_list):
"""assigns a value of the receiver_list
to the signal receivers
"""
signal.receivers = receiver_list
def pop_all_db_signal_receivers():
"""loops through all relevant signals
pops their receivers and returns a
dictionary where signals are keys
and lists of receivers are values
"""
#this is the only askbot signal that is not defined here
#must use this to avoid a circular import
from askbot.models.badges import award_badges_signal
signals = (
#askbot signals
tags_updated,
edit_question_or_answer,
delete_question_or_answer,
flag_offensive,
remove_flag_offensive,
user_updated,
user_logged_in,
user_registered,
post_updated,
award_badges_signal,
#django signals
pre_save,
post_save,
pre_delete,
post_delete,
post_syncdb,
)
if 'm2m_changed' in globals():
signals += (m2m_changed, )
receiver_data = dict()
for signal in signals:
receiver_data[signal] = pop_signal_receivers(signal)
return receiver_data
def set_all_db_signal_receivers(receiver_data):
"""takes receiver data as an argument
where the argument is as returned by the
pop_all_db_signal_receivers() call
and sets the receivers back to the signals
"""
for (signal, receivers) in receiver_data.items():
signal.receivers = receivers
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