django-orchestra/orchestra/contrib/mailer/engine.py

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2023-07-09 07:51:51 +00:00
import smtplib
from datetime import timedelta
from socket import error as SocketError
from django.core.mail import get_connection
from django.db.models import Q
from django.utils import timezone
from orchestra.utils.sys import LockFile, OperationLocked
from . import settings
from .models import Message
def send_message(message, connection=None, bulk=settings.MAILER_BULK_MESSAGES):
message.last_try = timezone.now()
update_fields = ['last_try']
if message.state != message.QUEUED:
message.retries += 1
update_fields.append('retries')
message.save(update_fields=update_fields)
if connection is None:
connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
if connection.connection is None:
try:
connection.open()
except Exception as err:
message.defer()
message.log(err)
return
error = None
try:
connection.connection.sendmail(message.from_address, [message.to_address], message.content.encode())
except (SocketError,
smtplib.SMTPSenderRefused,
smtplib.SMTPRecipientsRefused,
smtplib.SMTPAuthenticationError) as err:
message.defer()
error = err
else:
message.sent()
message.log(error)
return connection
def send_pending(bulk=settings.MAILER_BULK_MESSAGES):
try:
with LockFile('/dev/shm/mailer.send_pending.lock'):
connection = get_connection(backend='django.core.mail.backends.smtp.EmailBackend')
cur, total = 0, 0
for message in Message.objects.filter(state=Message.QUEUED).order_by('priority', 'last_try', 'created_at'):
if cur >= bulk:
connection.close()
cur = 0
send_message(message, connection, bulk)
cur += 1
total += 1
now = timezone.now()
qs = Q()
for retries, seconds in enumerate(settings.MAILER_DEFERE_SECONDS):
delta = timedelta(seconds=seconds)
qs = qs | Q(retries=retries, last_try__lte=now-delta)
for message in Message.objects.filter(state=Message.DEFERRED).filter(qs).order_by('priority', 'last_try'):
if cur >= bulk:
connection.close()
cur = 0
send_message(message, connection, bulk)
cur += 1
total += 1
return total
except OperationLocked:
pass
finally:
if 'connection' in vars() and connection.connection is not None:
connection.close()