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