def mailing_list_users_changed(sender, instance, action, **kwargs):
"""
Acts as a callback when the many2many relation
containing users for this list is updated.
Attempts to commit to mailman before the
reinhardt database is updated.
"""
if action == "pre_add":
users = User.objects.filter(id__in=kwargs['pk_set'])
try:
for user in users:
subscribe_member(user, instance)
# XXX: need to move away from wrapping the different types of
# exception all in MailmanError
#
# preferably here we would check if we can commit all of the users
# to the mailman database before trying to
#
# in the next version. :P -- monk
except MailmanError: pass
elif action == "pre_remove":
users = User.objects.filter(id__in=kwargs['pk_set'])
try:
for user in users:
unsubscribe_member(user, instance)
except MailmanError: pass
def sync_email_with_mailman_database(sender, instance, **kwargs):
"""
Used to ensure that the mailman database stays faithful to
the reinhardt one when an email address is updated
Intended to be triggered pre_save, and act when a user changes
their email address
"""
mailman_logger.debug('sync_email_with_mailman_database called')
mailman_logger.debug(instance)
try:
old_user = User.objects.get(id=instance.id)
except User.DoesNotExist:
old_user = instance
lists = MailingList.objects.filter(users=instance)
# silently update mailman list subscriptions
# not sure what to do on mailman throwing an error here yet
for l in lists:
try:
mailman_logger.debug('unsubscribing %s' % old_user.email)
unsubscribe_member(old_user, l)
except MailmanError: pass
try:
mailman_logger.debug('subscribing %s' % instance.email)
subscribe_member(instance, l)
except MailmanError: pass
