delay writing cache to prevent writing the same thing over and over

import json

import os.path

import threading

import time

from modules.paths import data_path, script_path

cache_data = None

cache_lock = threading.Lock()

dump_cache_after = None

dump_cache_thread = None

def dump_cache():

    """

    Saves all cache data to a file.

    Marks cache for writing to disk. 5 seconds after no one else flags the cache for writing, it is written.

    """

    global dump_cache_after

    global dump_cache_thread

    def thread_func():

        global dump_cache_after

        global dump_cache_thread

        while dump_cache_after is not None and time.time() < dump_cache_after:

            time.sleep(1)

        with cache_lock:

            with open(cache_filename, "w", encoding="utf8") as file:

                json.dump(cache_data, file, indent=4)

            dump_cache_after = None

            dump_cache_thread = None

    with cache_lock:

        dump_cache_after = time.time() + 5

        if dump_cache_thread is None:

            dump_cache_thread = threading.Thread(name='cache-writer', target=thread_func)

            dump_cache_thread.start()

def cache(subsection):

    """