from __future__ import print_function, unicode_literals
from django.core.mail.backends.smtp import EmailBackend
from .base import BaseCallbackEmailBackendMixin
[docs]class CallbackEmailBackend(BaseCallbackEmailBackendMixin, EmailBackend):
"""
Custom SMPT email backend which sends signals on progress events
of sending messages.
"""
[docs] def send_messages(self, email_messages):
"""
Custom implementation of sending messages which also
calls mail signals.
Unfortunately vanilla Django implementation does not
provide enough hooks for when messages are sent
hence this method needs to duplicate the whole method.
"""
if not email_messages:
return
with self._lock:
new_conn_created = self.open()
if not self.connection:
# We failed silently on open().
# Trying to send would be pointless.
for message in email_messages:
self.failed(message, 'Could not establish connection')
return
num_sent = 0
for message in email_messages:
self.sending(message)
sent = self._send(message)
if sent:
self.sent(message)
num_sent += 1
else:
self.failed(message, 'Could not send email over SMTP')
if new_conn_created:
self.close()
return num_sent