91 lines
3.3 KiB
Python
91 lines
3.3 KiB
Python
import contextlib
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import json
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import os
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import re
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import shutil
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import traceback
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import urllib.parse
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from .utils import expand_path, traverse_obj, version_tuple, write_json_file
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from .version import __version__
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class Cache:
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def __init__(self, ydl):
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self._ydl = ydl
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def _get_root_dir(self):
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res = self._ydl.params.get('cachedir')
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if res is None:
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cache_root = os.getenv('XDG_CACHE_HOME', '~/.cache')
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res = os.path.join(cache_root, 'yt-dlp')
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return expand_path(res)
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def _get_cache_fn(self, section, key, dtype):
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assert re.match(r'^[\w.-]+$', section), f'invalid section {section!r}'
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key = urllib.parse.quote(key, safe='').replace('%', ',') # encode non-ascii characters
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return os.path.join(self._get_root_dir(), section, f'{key}.{dtype}')
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@property
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def enabled(self):
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return self._ydl.params.get('cachedir') is not False
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def store(self, section, key, data, dtype='json'):
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assert dtype in ('json',)
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if not self.enabled:
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return
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fn = self._get_cache_fn(section, key, dtype)
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try:
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os.makedirs(os.path.dirname(fn), exist_ok=True)
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self._ydl.write_debug(f'Saving {section}.{key} to cache')
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write_json_file({'yt-dlp_version': __version__, 'data': data}, fn)
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except Exception:
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tb = traceback.format_exc()
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self._ydl.report_warning(f'Writing cache to {fn!r} failed: {tb}')
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def _validate(self, data, min_ver):
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version = traverse_obj(data, 'yt-dlp_version')
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if not version: # Backward compatibility
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data, version = {'data': data}, '2022.08.19'
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if not min_ver or version_tuple(version) >= version_tuple(min_ver):
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return data['data']
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self._ydl.write_debug(f'Discarding old cache from version {version} (needs {min_ver})')
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def load(self, section, key, dtype='json', default=None, *, min_ver=None):
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assert dtype in ('json',)
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if not self.enabled:
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return default
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cache_fn = self._get_cache_fn(section, key, dtype)
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with contextlib.suppress(OSError):
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try:
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with open(cache_fn, encoding='utf-8') as cachef:
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self._ydl.write_debug(f'Loading {section}.{key} from cache')
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return self._validate(json.load(cachef), min_ver)
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except (ValueError, KeyError):
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try:
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file_size = os.path.getsize(cache_fn)
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except OSError as oe:
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file_size = str(oe)
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self._ydl.report_warning(f'Cache retrieval from {cache_fn} failed ({file_size})')
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return default
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def remove(self):
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if not self.enabled:
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self._ydl.to_screen('Cache is disabled (Did you combine --no-cache-dir and --rm-cache-dir?)')
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return
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cachedir = self._get_root_dir()
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if not any((term in cachedir) for term in ('cache', 'tmp')):
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raise Exception('Not removing directory %s - this does not look like a cache dir' % cachedir)
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self._ydl.to_screen(
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'Removing cache dir %s .' % cachedir, skip_eol=True)
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if os.path.exists(cachedir):
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self._ydl.to_screen('.', skip_eol=True)
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shutil.rmtree(cachedir)
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self._ydl.to_screen('.')
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