Building a Self-Healing Python Bot That Never Crashes

#automation #devops #python #tutorial

Most Python bots crash and stay dead. Here is how to build one that auto-recovers.

Auto-Restart with systemd

[Service]
ExecStart=/usr/bin/python3 bot.py
Restart=always
RestartSec=5
MemoryMax=256M

Watchdog Pattern

import time, traceback, logging

def run_with_watchdog(func, restart_delay=5):
    while True:
        try:
            func()
        except Exception as e:
            logging.error(f"Crashed: {e}")
            logging.error(traceback.format_exc())
            time.sleep(restart_delay)

Memory Monitoring

import psutil

def check_memory(threshold=80):
    usage = psutil.virtual_memory().percent
    if usage > threshold:
        import gc
        gc.collect()
        return True
    return False

Heartbeat System

import time, json
from pathlib import Path

def heartbeat(service_name, interval=60):
    while True:
        Path(f"/tmp/{service_name}.heartbeat").write_text(time.strftime("%Y-%m-%dT%H:%M:%S"))
        time.sleep(interval)

The complete self-healing bot framework with monitoring, auto-restart, and memory management is available at https://create-openings-unsigned-garden.trycloudflare.com.

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