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March 10, 2023 20:10
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how to send emails with fastapi + background tasks
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import asyncio | |
from asyncio import Queue | |
from src.email.templates import EmailTemplate | |
from src.config.config import config_instance | |
from sendgrid import SendGridAPIClient | |
from sendgrid.helpers.mail import Mail | |
class Emailer: | |
""" | |
NOTE The Message Queue will send out messages every 5 minutes | |
Emailing Class, used to create email servers and manage sending emails | |
""" | |
def __init__(self): | |
self.email_queues = Queue(maxsize=1024) | |
self._dev_messages_queue = Queue(maxsize=100) | |
self.server = SendGridAPIClient(config_instance().EMAIL_SETTINGS.SENDGRID_API_KEY) | |
self._queue_interval_seconds: int = 60*5 | |
@staticmethod | |
async def create_message(sender_email: str, recipient_email: str, | |
subject: str, html: str) -> Mail: | |
"""Create the message with plain-text and HTML versions.""" | |
return Mail( | |
from_email=sender_email, | |
to_emails=recipient_email, | |
subject=subject, | |
html_content=html) | |
async def send_email(self, message: Mail) -> bool: | |
"""Send the email via the SMTP server.""" | |
response = self.server.send(message) | |
if response.status_code in [200, 201]: | |
return True | |
return False | |
async def put_message_on_queue(self, message: Mail): | |
""" | |
this will put the message to be sent later on a Queue | |
:return: | |
""" | |
await self.email_queues.put(message) | |
async def process_message_queues(self): | |
while True: | |
if not self.email_queues.empty(): | |
message = await self.email_queues.get() | |
await email_process.send_email(message) | |
await asyncio.sleep(self._queue_interval_seconds) | |
async def send_subscription_welcome_email(self, sender_email: str, | |
recipient_email: str, | |
client_name: str, | |
plan_name: str, templates: EmailTemplate = EmailTemplate): | |
"""Send the subscription welcome email.""" | |
subject = f"Welcome to our {plan_name} subscription!" | |
text = f"Dear {client_name},\n\nThank you for signing up for our {plan_name} subscription!" | |
html = await templates.subscription_welcome(client_name=client_name, plan_name=plan_name) | |
message_dict = dict(sender_email=sender_email, recipient_email=recipient_email, | |
subject=subject, html=html) | |
await self.put_message_on_queue(await self.create_message(**message_dict)) | |
async def send_payment_confirmation_email(self, | |
sender_email: str, | |
recipient_email: str, | |
client_name: str, | |
plan_name: str, | |
amount: float, templates: EmailTemplate = EmailTemplate): | |
"""Send the payment confirmation email.""" | |
subject = f"Payment confirmation for your {plan_name} subscription" | |
html = await templates.payment_confirmation(client_name=client_name, plan_name=plan_name, amount=amount) | |
message_dict = dict(sender_email=sender_email, recipient_email=recipient_email, | |
subject=subject, html=html) | |
await self.put_message_on_queue(message=await self.create_message(**message_dict)) | |
async def send_account_confirmation_email(self, | |
sender_email: str, | |
recipient_email: str, | |
client_name: str, | |
verification_link: str, | |
templates: EmailTemplate = EmailTemplate): | |
subject = f"Account confirmation from EOD-STOCK-API.SITE" | |
html = await templates.account_confirmation(client_name=client_name, verification_link=verification_link) | |
message_dict = dict(sender_email=sender_email, recipient_email=recipient_email, subject=subject, html=html) | |
await self.put_message_on_queue(message=await self.create_message(**message_dict)) | |
async def send_message_to_devs(self, message_type: str, request, api_key: str, priority: int = 1, | |
templates: EmailTemplate = EmailTemplate): | |
""" | |
:param templates: | |
:param priority: | |
:param request: | |
:param message_type: | |
:param api_key: | |
:return: | |
""" | |
subject = f"Logs from EOD-STOCK-API.SITE : {message_type}" | |
_request = dict(url=request.url, headers=request.headers, method=request.method) | |
html = await templates.devs_message(**_request) | |
message_dict = dict(sender_email="noreply@eod-stock-api.site", recipient_email="support@eod-stock-api.site", | |
subject=subject, html=html) | |
await self.put_message_on_queue(message=await self.create_message(**message_dict)) | |
email_process = Emailer() |
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The only you need to do is schedule
async def process_message_queues(self):
while True:
if not self.email_queues.empty():
message = await self.email_queues.get()
await email_process.send_email(message)
await asyncio.sleep(self._queue_interval_seconds)
and then create endpoints for sending emails, or just call the methods through email_process on other projects
works great as a microservice to just send messages