Is it possible to send email messages in background using celery?

[jabajke]

I use redis as broker and celery as worker, so when I try to send messages using celery, then I got error like: Arguments: {'hostname': 'celery@639c8e328783', 'id': 'bbe0aa71-7b7b-49d5-a4ab-83cb9b1d4365', 'name': 'send_email', 'exc': "PydanticClassRequired('Message schema should be provided from MessageSchema class')" @celery.task(name='send_email') def send_email(message: dict) -> None: fm = FastMail(email_config) mes = MessageSchema(**message) asyncio.run(fm.send_message(mes)) here is how my task looks like, my server doesnt break. as I understand, redis make dict from messageschema and sending email doesnt work, maybe someone met this issue

[maestro-1]

@jabajke Celery only works with synchronous code, and fast-api mail is completely asynchronous, so it doesn't run in celery workers. You can try asgiref library.

from asgiref.sync import async_to_sync

[vlakius]

Although it is an old post, I leave the solution in case anyone has the same question: This is the solution I found for sending mails with celery and fastapi-mail

========== FASTAPI-MAIL =============

from fastapi_mail import ConnectionConfig, FastMail, MessageSchema, MessageType

conf = ConnectionConfig(
          # your config here
  ...
)
async def send_email():
    message = MessageSchema(
        subject="FASTAPI test",
        recipients=["test@gmail.com"],
        body="Test",
        subtype=MessageType.html,
    )

    fm = FastMail(conf)
    await fm.send_message(message)
    return {"message": "Email sent"}

========== CELERY =========

from celery import Celery
from celery.states import FAILURE, PENDING
import asyncio

celery = Celery("app")

@celery.task(name="celery-mail", bind=True)
def celery_mail(self):
    self.update_state(state=PENDING)
    try:
        asyncio.run(send_email())
    except Exception as e:  # customize exception if needed
        self.update_state(state=FAILURE)
        raise e

========== FASTAPI =========

from fastapi import Fastapi
app = Fastapi()

@app.post("/send-email")
async def send_celery_email():
    celery_mail.delay()

This is working in production code

[malyanoff]

Although it is an old post, I leave the solution in case anyone has the same question: This is the solution I found for sending mails with celery and fastapi-mail

========== FASTAPI-MAIL =============

from fastapi_mail import ConnectionConfig, FastMail, MessageSchema, MessageType

conf = ConnectionConfig(
          # your config here
  ...
)
async def send_email():
    message = MessageSchema(
        subject="FASTAPI test",
        recipients=["test@gmail.com"],
        body="Test",
        subtype=MessageType.html,
    )

    fm = FastMail(conf)
    await fm.send_message(message)
    return {"message": "Email sent"}

========== CELERY =========

from celery import Celery
from celery.states import FAILURE, PENDING
import asyncio

celery = Celery("app")

@celery.task(name="celery-mail", bind=True)
def celery_mail(self):
    self.update_state(state=PENDING)
    try:
        asyncio.run(send_email())
    except Exception as e:  # customize exception if needed
        self.update_state(state=FAILURE)
        raise e

========== FASTAPI =========

from fastapi import Fastapi
app = Fastapi()

@app.post("/send-email")
async def send_celery_email():
    celery_mail.delay()

This is working in production code

Thank you, that really works