healthchecks/hc/lib/emails.py
Pēteris Caune fca600659d
Improve hc.lib.emails.send()
- add optional `from_email` argument
- add test cases that exercise the retry loop
2021-08-03 19:02:25 +03:00

92 lines
2.3 KiB
Python

import smtplib
from threading import Thread
import time
from django.conf import settings
from django.core.mail import EmailMultiAlternatives
from django.template.loader import render_to_string as render
class EmailThread(Thread):
MAX_TRIES = 3
def __init__(self, message):
Thread.__init__(self)
self.message = message
def run(self):
for attempt in range(0, self.MAX_TRIES):
try:
# Make sure each retry creates a new connection:
self.message.connection = None
self.message.send()
# No exception--great, return from the retry loop
return
except smtplib.SMTPServerDisconnected as e:
if attempt + 1 == self.MAX_TRIES:
# This was the last attempt and it failed:
# re-raise the exception
raise e
# Wait 1s before retrying
time.sleep(1)
def send(name, to, ctx, headers={}, from_email=None):
ctx["SITE_ROOT"] = settings.SITE_ROOT
subject = render("emails/%s-subject.html" % name, ctx).strip()
body = render("emails/%s-body-text.html" % name, ctx)
html = render("emails/%s-body-html.html" % name, ctx)
msg = EmailMultiAlternatives(subject, body, to=(to,), headers=headers)
msg.attach_alternative(html, "text/html")
if from_email:
msg.from_email = from_email
t = EmailThread(msg)
if hasattr(settings, "BLOCKING_EMAILS"):
# In tests, we send emails synchronously
# so we can inspect the outgoing messages
t.run()
else:
# Outside tests, we send emails on thread,
# so there is no delay for the user.
t.start()
def login(to, ctx):
send("login", to, ctx)
def transfer_request(to, ctx):
send("transfer-request", to, ctx)
def alert(to, ctx, headers={}):
send("alert", to, ctx, headers=headers)
def verify_email(to, ctx):
send("verify-email", to, ctx)
def report(to, ctx, headers={}):
send("report", to, ctx, headers=headers)
def deletion_notice(to, ctx, headers={}):
send("deletion-notice", to, ctx, headers=headers)
def sms_limit(to, ctx):
send("sms-limit", to, ctx)
def call_limit(to, ctx):
send("phone-call-limit", to, ctx)
def sudo_code(to, ctx):
send("sudo-code", to, ctx)