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Copy pathcache.py
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91 lines (74 loc) · 3.29 KB
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import contextlib
import json
import os
import re
import shutil
import traceback
import urllib.parse
from .utils import expand_path, traverse_obj, version_tuple, write_json_file
from .version import __version__
class Cache:
def __init__(self, ydl):
self._ydl = ydl
def _get_root_dir(self):
res = self._ydl.params.get('cachedir')
if res is None:
cache_root = os.getenv('XDG_CACHE_HOME', '~/.cache')
res = os.path.join(cache_root, 'yt-dlp')
return expand_path(res)
def _get_cache_fn(self, section, key, dtype):
assert re.match(r'^[\w.-]+$', section), f'invalid section {section!r}'
key = urllib.parse.quote(key, safe='').replace('%', ',') # encode non-ascii characters
return os.path.join(self._get_root_dir(), section, f'{key}.{dtype}')
@property
def enabled(self):
return self._ydl.params.get('cachedir') is not False
def store(self, section, key, data, dtype='json'):
assert dtype in ('json',)
if not self.enabled:
return
fn = self._get_cache_fn(section, key, dtype)
try:
os.makedirs(os.path.dirname(fn), exist_ok=True)
self._ydl.write_debug(f'Saving {section}.{key} to cache')
write_json_file({'yt-dlp_version': __version__, 'data': data}, fn)
except Exception:
tb = traceback.format_exc()
self._ydl.report_warning(f'Writing cache to {fn!r} failed: {tb}')
def _validate(self, data, min_ver):
version = traverse_obj(data, 'yt-dlp_version')
if not version: # Backward compatibility
data, version = {'data': data}, '2022.08.19'
if not min_ver or version_tuple(version) >= version_tuple(min_ver):
return data['data']
self._ydl.write_debug(f'Discarding old cache from version {version} (needs {min_ver})')
def load(self, section, key, dtype='json', default=None, *, min_ver=None):
assert dtype in ('json',)
if not self.enabled:
return default
cache_fn = self._get_cache_fn(section, key, dtype)
with contextlib.suppress(OSError):
try:
with open(cache_fn, encoding='utf-8') as cachef:
self._ydl.write_debug(f'Loading {section}.{key} from cache')
return self._validate(json.load(cachef), min_ver)
except (ValueError, KeyError):
try:
file_size = os.path.getsize(cache_fn)
except OSError as oe:
file_size = str(oe)
self._ydl.report_warning(f'Cache retrieval from {cache_fn} failed ({file_size})')
return default
def remove(self):
if not self.enabled:
self._ydl.to_screen('Cache is disabled (Did you combine --no-cache-dir and --rm-cache-dir?)')
return
cachedir = self._get_root_dir()
if not any((term in cachedir) for term in ('cache', 'tmp')):
raise Exception(f'Not removing directory {cachedir} - this does not look like a cache dir')
self._ydl.to_screen(
f'Removing cache dir {cachedir} .', skip_eol=True)
if os.path.exists(cachedir):
self._ydl.to_screen('.', skip_eol=True)
shutil.rmtree(cachedir)
self._ydl.to_screen('.')