Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/cache.py

   1 from __future__ import unicode_literals
   2
   3 import errno
   4 import io
   5 import json
   6 import os
   7 import re
   8 import shutil
   9 import traceback
  10
  11 from .compat import compat_expanduser, compat_getenv
  12 from .utils import write_json_file
  13
  14
  15 class Cache(object):
  16     def __init__(self, ydl):
  17         self._ydl = ydl
  18
  19     def _get_root_dir(self):
  20         res = self._ydl.params.get('cachedir')
  21         if res is None:
  22             cache_root = compat_getenv('XDG_CACHE_HOME', '~/.cache')
  23             res = os.path.join(cache_root, 'youtube-dl')
  24         return compat_expanduser(res)
  25
  26     def _get_cache_fn(self, section, key, dtype):
  27         assert re.match(r'^[a-zA-Z0-9_.-]+$', section), \
  28             'invalid section %r' % section
  29         assert re.match(r'^[a-zA-Z0-9_.-]+$', key), 'invalid key %r' % key
  30         return os.path.join(
  31             self._get_root_dir(), section, '%s.%s' % (key, dtype))
  32
  33     @property
  34     def enabled(self):
  35         return self._ydl.params.get('cachedir') is not False
  36
  37     def store(self, section, key, data, dtype='json'):
  38         assert dtype in ('json',)
  39
  40         if not self.enabled:
  41             return
  42
  43         fn = self._get_cache_fn(section, key, dtype)
  44         try:
  45             try:
  46                 os.makedirs(os.path.dirname(fn))
  47             except OSError as ose:
  48                 if ose.errno != errno.EEXIST:
  49                     raise
  50             write_json_file(data, fn)
  51         except Exception:
  52             tb = traceback.format_exc()
  53             self._ydl.report_warning(
  54                 'Writing cache to %r failed: %s' % (fn, tb))
  55
  56     def load(self, section, key, dtype='json', default=None):
  57         assert dtype in ('json',)
  58
  59         if not self.enabled:
  60             return default
  61
  62         cache_fn = self._get_cache_fn(section, key, dtype)
  63         try:
  64             try:
  65                 with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
  66                     return json.load(cachef)
  67             except ValueError:
  68                 try:
  69                     file_size = os.path.getsize(cache_fn)
  70                 except (OSError, IOError) as oe:
  71                     file_size = str(oe)
  72                 self._ydl.report_warning(
  73                     'Cache retrieval from %s failed (%s)' % (cache_fn, file_size))
  74         except IOError:
  75             pass  # No cache available
  76
  77         return default
  78
  79     def remove(self):
  80         if not self.enabled:
  81             self._ydl.to_screen('Cache is disabled (Did you combine --no-cache-dir and --rm-cache-dir?)')
  82             return
  83
  84         cachedir = self._get_root_dir()
  85         if not any((term in cachedir) for term in ('cache', 'tmp')):
  86             raise Exception('Not removing directory %s - this does not look like a cache dir' % cachedir)
  87
  88         self._ydl.to_screen(
  89             'Removing cache dir %s .' % cachedir, skip_eol=True)
  90         if os.path.exists(cachedir):
  91             self._ydl.to_screen('.', skip_eol=True)
  92             shutil.rmtree(cachedir)
  93         self._ydl.to_screen('.')