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| import json | |
| import os.path | |
| import threading | |
| import time | |
| from modules.paths import data_path, script_path | |
| cache_filename = os.path.join(data_path, "cache.json") | |
| cache_data = None | |
| cache_lock = threading.Lock() | |
| dump_cache_after = None | |
| dump_cache_thread = None | |
| def dump_cache(): | |
| """ | |
| 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): | |
| """ | |
| Retrieves or initializes a cache for a specific subsection. | |
| Parameters: | |
| subsection (str): The subsection identifier for the cache. | |
| Returns: | |
| dict: The cache data for the specified subsection. | |
| """ | |
| global cache_data | |
| if cache_data is None: | |
| with cache_lock: | |
| if cache_data is None: | |
| if not os.path.isfile(cache_filename): | |
| cache_data = {} | |
| else: | |
| try: | |
| with open(cache_filename, "r", encoding="utf8") as file: | |
| cache_data = json.load(file) | |
| except Exception: | |
| os.replace(cache_filename, os.path.join(script_path, "tmp", "cache.json")) | |
| print('[ERROR] issue occurred while trying to read cache.json, move current cache to tmp/cache.json and create new cache') | |
| cache_data = {} | |
| s = cache_data.get(subsection, {}) | |
| cache_data[subsection] = s | |
| return s | |
| def cached_data_for_file(subsection, title, filename, func): | |
| """ | |
| Retrieves or generates data for a specific file, using a caching mechanism. | |
| Parameters: | |
| subsection (str): The subsection of the cache to use. | |
| title (str): The title of the data entry in the subsection of the cache. | |
| filename (str): The path to the file to be checked for modifications. | |
| func (callable): A function that generates the data if it is not available in the cache. | |
| Returns: | |
| dict or None: The cached or generated data, or None if data generation fails. | |
| The `cached_data_for_file` function implements a caching mechanism for data stored in files. | |
| It checks if the data associated with the given `title` is present in the cache and compares the | |
| modification time of the file with the cached modification time. If the file has been modified, | |
| the cache is considered invalid and the data is regenerated using the provided `func`. | |
| Otherwise, the cached data is returned. | |
| If the data generation fails, None is returned to indicate the failure. Otherwise, the generated | |
| or cached data is returned as a dictionary. | |
| """ | |
| existing_cache = cache(subsection) | |
| ondisk_mtime = os.path.getmtime(filename) | |
| entry = existing_cache.get(title) | |
| if entry: | |
| cached_mtime = entry.get("mtime", 0) | |
| if ondisk_mtime > cached_mtime: | |
| entry = None | |
| if not entry or 'value' not in entry: | |
| value = func() | |
| if value is None: | |
| return None | |
| entry = {'mtime': ondisk_mtime, 'value': value} | |
| existing_cache[title] = entry | |
| dump_cache() | |
| return entry['value'] | |