mash-server/src/config/hotreloader.py

import logging

DEPENDENCY_INSTALLED = None

try:
    from watchdog.observers import Observer
    from watchdog.events import (
        FileSystemEventHandler,
        FileCreatedEvent,
        FileModifiedEvent,
    )

    DEPENDENCY_INSTALLED = True
    logging.debug("Watchdog imported successfully. Hot reloading available.")
except ImportError:
    DEPENDENCY_INSTALLED = False
    logging.info("Watchdog is not installed. Hot reloading unavailable.")


class HotReloader(FileSystemEventHandler):
    def __init__(self, path):
        if not DEPENDENCY_INSTALLED:
            return

        self.path = path
        self.observer = Observer()
        self.observer.schedule(self, path, recursive=True)
        self.observer.start()

    def __del__(self):
        if not DEPENDENCY_INSTALLED:
            return

        self.observer.stop()
        self.observer.join()

    def on_modified(self, event: FileModifiedEvent):
        logging.info("Config file modified. Triggering hot reload.")

    def on_created(self, event: FileCreatedEvent):
        logging.info("New config file created. Triggering hot reload.")