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function run_smtp_server

Maturity: 46

Initializes and runs an asynchronous SMTP server using a new event loop, with proper error handling and graceful shutdown.

File:
/tf/active/vicechatdev/email-forwarder/src/forwarder/smtp_server.py
Lines:
140 - 157
Complexity:
moderate

Purpose

This function serves as the main entry point for starting an SMTP server. It creates a new asyncio event loop, instantiates an SMTPServer object, and runs it indefinitely until an error occurs or the server is stopped. The function handles exceptions and ensures proper cleanup of the event loop on shutdown. It's designed to be used as a standalone server process for receiving and processing email messages.

Source Code

def run_smtp_server():
    """Run the SMTP server."""
    server = SMTPServer()
    
    try:
        # Set up event loop
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        
        # Run server
        loop.run_until_complete(server.run_forever())
        
    except Exception as e:
        logger.error(f"Error running SMTP server: {e}")
        raise
    finally:
        loop.close()
        logging.info("SMTP server shutting down.")

Return Value

This function does not return any value (implicitly returns None). It runs indefinitely until an exception occurs or the server is manually stopped. If an exception occurs, it is logged and re-raised after cleanup.

Dependencies

  • asyncio
  • logging
  • aiosmtpd
  • email
  • typing
  • sys
  • os
  • signal

Required Imports

import asyncio
import logging

Usage Example

import asyncio
import logging
from smtp_server import SMTPServer

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Define or import SMTPServer class
# class SMTPServer:
#     async def run_forever(self):
#         # Server implementation
#         pass

def run_smtp_server():
    """Run the SMTP server."""
    server = SMTPServer()
    
    try:
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        loop.run_until_complete(server.run_forever())
    except Exception as e:
        logger.error(f"Error running SMTP server: {e}")
        raise
    finally:
        loop.close()
        logging.info("SMTP server shutting down.")

if __name__ == "__main__":
    run_smtp_server()

Best Practices

  • Ensure the SMTPServer class is properly defined with an async run_forever() method before calling this function
  • Configure logging before calling this function to capture server events and errors
  • This function is blocking and will run indefinitely - it should be called in a dedicated process or thread
  • Consider implementing signal handlers (SIGTERM, SIGINT) for graceful shutdown before calling this function
  • The function creates a new event loop, so it should not be called from within an existing event loop context
  • Ensure proper exception handling in the SMTPServer.run_forever() method to prevent unexpected crashes
  • The logger object must be defined in the module scope before this function is called
  • Consider wrapping this function call in a main guard (if __name__ == '__main__':) when used as a script entry point

Tags

smtp email server async asyncio event-loop networking mail-server aiosmtpd daemon service

Similar Components

AI-powered semantic similarity - components with related functionality:

  • function run_server 89.9% similar

    Initializes and runs an asynchronous SMTP server with platform-specific event loop configuration and error handling.

    From: /tf/active/vicechatdev/email-forwarder/src/main.py

  • class SMTPServer 73.0% similar

    SMTPServer is a class that manages an SMTP server for receiving emails, handling their forwarding, and providing server statistics.

    From: /tf/active/vicechatdev/email-forwarder/src/forwarder/smtp_server.py

  • function main_v9 70.0% similar

    Asynchronous main entry point function that initializes and runs an email forwarding SMTP server with logging, configuration validation, and graceful shutdown handling.

    From: /tf/active/vicechatdev/email-forwarder/src/main.py

  • class TestSmtpServer 65.7% similar

    A test class for validating the functionality of the SmtpServer class, including server startup, email handling, email forwarding, and error handling for invalid inputs.

    From: /tf/active/vicechatdev/email-forwarder/tests/test_smtp_server.py

  • function test_smtp_basic 56.0% similar

    Tests basic SMTP server connectivity by attempting to establish a connection to a local SMTP server on port 2525 and performing an EHLO handshake.

    From: /tf/active/vicechatdev/email-forwarder/service_status.py
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