How to Handle Errors and Send Emails in Case of Exceptions in FastAPI

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Tiempo de lectura: 2 minutos

In FastAPI development with Python, proper error handling is crucial to ensure smooth operation. In this tutorial, we will learn to implement an exception handling system that will automatically send an email to the administrator when an error occurs in our API.

Step 1: Setting up the handler.py File

Firstly, we will create a file named handler.py that will contain our exception handling and email-sending functions. This file can be imported into all modules of our application.

# handler.py
import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

# Set the email address to which the message will be sent
recipient = 'contact@email.com'

# Function to send an email
def send_email(message, recipient):
    # Email server setup
    email_server = smtplib.SMTP('smtp.your-server.com', 587)
    email_server.starttls()
    email_server.login('your-email@gmail.com', 'your-password')

    # Create the email message
    email_message = MIMEMultipart()
    email_message['From'] = 'your-email@gmail.com'
    email_message['To'] = recipient
    email_message['Subject'] = 'Error in FastAPI API'
    email_message.attach(MIMEText(message, 'plain'))

    # Send the email
    email_server.send_message(email_message)
    email_server.quit()

# Function to handle exceptions
def handle_exception(exception):
    # Get information about the exception
    message = f'An error occurred in the FastAPI API.\n\n' \
              f'Error message: {exception}\n'

    # Send an email with the error information
    send_email(message, recipient)

    # You can log the error elsewhere, such as a log file

    # You can customize the API error response if desired

    return {'error': 'An error occurred. The administrator has been notified.'}

Step 2: Using the handler.py File in Your FastAPI Application

Now, in each of your FastAPI modules, import the handler.py file at the beginning to enable exception handling and email sending.

# main.py
from fastapi import FastAPI
from handler import handle_exception

app = FastAPI()

# Set the custom exception handling function
app.add_exception_handler(Exception, handle_exception)

# Define your routes and application logic below

Conclusion:

With these steps, you have implemented a basic but effective exception handling system in your FastAPI application in Python that will automatically send emails to the administrator when an error occurs. Make sure to customize the functions according to your specific needs, and remember that this is just a starting point; you can expand and enhance this functionality based on your project requirements.

You are now better equipped to maintain and manage your FastAPI API more effectively!

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