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signals.py
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signals.py
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# coding: utf-8
import logging
from django.db.models.signals import post_save, post_delete, post_migrate
from django.core.signals import request_started
from django.dispatch import receiver, Signal
from students.models import Student, Group, LogEntry
from django.utils.translation import ugettext as _
req_counter = 0
contact_letter_sent = Signal()
@receiver(request_started)
def log_request_started(sender, **kwargs):
"""Writes information about the amount of requests into log file"""
global req_counter
req_counter += 1
logger = logging.getLogger(__name__)
logger.info(u"%s: %s" % (_(u'Requests count'), req_counter))
@receiver(contact_letter_sent)
def log_contact_admin(sender, **kwargs):
"""Writes information about contact letter sent into log file"""
logger = logging.getLogger(__name__)
logger.info(u"%s %s" % (_(u'Sent a message from'), kwargs['email']))
@receiver(post_migrate)
def log_migrate_event(sender, **kwargs):
"""Writes information about migrate into log file"""
if kwargs['app_config'].label == 'students':
msg = _(u'Database migration completed')
logger = logging.getLogger(__name__)
logger.info(msg)
saveLogEntry("M", msg)
@receiver(post_save, sender=Student)
def log_student_updated_added_event(sender, **kwargs):
"""Writes information about newly added or updated student into log file"""
student = kwargs['instance']
msg = u"%s %s %s (ID: %d)" % (_(u'Student'), student, _(u'added') if kwargs['created'] else _(u'updated'), student.id)
logger = logging.getLogger(__name__)
logger.info(msg)
saveLogEntry("C" if kwargs['created'] else "U", msg)
@receiver(post_delete, sender=Student)
def log_student_deleted_event(sender, **kwargs):
"""Writes information about newly deleted student into log file"""
student = kwargs['instance']
msg = u"%s %s %s (ID: %d)" % (_(u'Student'), student, _(u'deleted'), student.id)
logger = logging.getLogger(__name__)
logger.info(msg)
saveLogEntry("D", msg)
@receiver(post_save, sender=Group)
def log_group_updated_added_event(sender, **kwargs):
"""Writes information about newly added or updated group into log file"""
group = kwargs['instance']
msg = u"%s %s %s (ID: %d)" % (_(u'Group'), group, _(u'added') if kwargs['created'] else _(u'updated'), group.id)
logger = logging.getLogger(__name__)
logger.info(msg)
saveLogEntry("C" if kwargs['created'] else "U", msg)
@receiver(post_delete, sender=Group)
def log_group_deleted_event(sender, **kwargs):
"""Writes information about newly deleted group into log file"""
group = kwargs['instance']
msg = u"%s %s %s (ID: %d)" % (_(u'Group'), group, _(u'deleted'), group.id)
logger = logging.getLogger(__name__)
logger.info(msg)
saveLogEntry("D", msg)
def saveLogEntry(e_type, e_desc):
ev = LogEntry()
ev.evt_type = e_type
ev.evt_user = 'Anonimus'
ev.evt_desc = e_desc
ev.save()