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97 lines
2.9 KiB
Python
97 lines
2.9 KiB
Python
from __future__ import unicode_literals
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import errno
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import io
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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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from .compat import compat_getenv
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from .utils import (
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expand_path,
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write_json_file,
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)
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class Cache(object):
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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 = compat_getenv('XDG_CACHE_HOME', '~/.cache')
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res = os.path.join(cache_root, 'youtube-dl')
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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'^[a-zA-Z0-9_.-]+$', section), \
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'invalid section %r' % section
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assert re.match(r'^[a-zA-Z0-9_.-]+$', key), 'invalid key %r' % key
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return os.path.join(
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self._get_root_dir(), section, '%s.%s' % (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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try:
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os.makedirs(os.path.dirname(fn))
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except OSError as ose:
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if ose.errno != errno.EEXIST:
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raise
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write_json_file(data, fn)
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except Exception:
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tb = traceback.format_exc()
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self._ydl.report_warning(
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'Writing cache to %r failed: %s' % (fn, tb))
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def load(self, section, key, dtype='json', default=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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try:
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try:
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with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
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return json.load(cachef)
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except ValueError:
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try:
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file_size = os.path.getsize(cache_fn)
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except (OSError, IOError) as oe:
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file_size = str(oe)
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self._ydl.report_warning(
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'Cache retrieval from %s failed (%s)' % (cache_fn, file_size))
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except IOError:
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pass # No cache available
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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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