| import json
|
| import os
|
| import os.path
|
| import threading
|
|
|
| import diskcache
|
| import tqdm
|
|
|
| from modules.paths import data_path, script_path
|
|
|
| cache_filename = os.environ.get('SD_WEBUI_CACHE_FILE', os.path.join(data_path, "cache.json"))
|
| cache_dir = os.environ.get('SD_WEBUI_CACHE_DIR', os.path.join(data_path, "cache"))
|
| caches = {}
|
| cache_lock = threading.Lock()
|
|
|
|
|
| def dump_cache():
|
| """old function for dumping cache to disk; does nothing since diskcache."""
|
|
|
| pass
|
|
|
|
|
| def make_cache(subsection: str) -> diskcache.Cache:
|
| return diskcache.Cache(
|
| os.path.join(cache_dir, subsection),
|
| size_limit=2**32,
|
| disk_min_file_size=2**18,
|
| )
|
|
|
|
|
| def convert_old_cached_data():
|
| try:
|
| with open(cache_filename, "r", encoding="utf8") as file:
|
| data = json.load(file)
|
| except FileNotFoundError:
|
| return
|
| except Exception:
|
| os.replace(cache_filename, os.path.join(script_path, "tmp", "cache.json"))
|
| print('[ERROR] issue occurred while trying to read cache.json; old cache has been moved to tmp/cache.json')
|
| return
|
|
|
| total_count = sum(len(keyvalues) for keyvalues in data.values())
|
|
|
| with tqdm.tqdm(total=total_count, desc="converting cache") as progress:
|
| for subsection, keyvalues in data.items():
|
| cache_obj = caches.get(subsection)
|
| if cache_obj is None:
|
| cache_obj = make_cache(subsection)
|
| caches[subsection] = cache_obj
|
|
|
| for key, value in keyvalues.items():
|
| cache_obj[key] = value
|
| progress.update(1)
|
|
|
|
|
| def cache(subsection):
|
| """
|
| Retrieves or initializes a cache for a specific subsection.
|
|
|
| Parameters:
|
| subsection (str): The subsection identifier for the cache.
|
|
|
| Returns:
|
| diskcache.Cache: The cache data for the specified subsection.
|
| """
|
|
|
| cache_obj = caches.get(subsection)
|
| if not cache_obj:
|
| with cache_lock:
|
| if not os.path.exists(cache_dir) and os.path.isfile(cache_filename):
|
| convert_old_cached_data()
|
|
|
| cache_obj = caches.get(subsection)
|
| if not cache_obj:
|
| cache_obj = make_cache(subsection)
|
| caches[subsection] = cache_obj
|
|
|
| return cache_obj
|
|
|
|
|
| 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']
|
|
|
