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[youtubedl] / 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('.')