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[youtube] Improve cache and add an option to print the extracted signatures

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This commit is contained in:
Philipp Hagemeister 2013-09-22 10:30:02 +02:00
parent c4417ddb61
commit edf3e38ebd
3 changed files with 65 additions and 12 deletions
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2
youtube_dl/FileDownloader.py
View File

@ -40,7 +40,7 @@ class FileDownloader(object):
min_filesize: Skip files smaller than this size
max_filesize: Skip files larger than this size
cachedir: Location of the cache files in the filesystem.
False to disable filesystem cache.
"NONE" to disable filesystem cache.
"""
params = None

6
youtube_dl/__init__.py
View File

@ -167,6 +167,7 @@ def parseOpts(overrideArguments=None):
help='Output descriptions of all supported extractors', default=False)
general.add_option('--proxy', dest='proxy', default=None, help='Use the specified HTTP/HTTPS proxy', metavar='URL')
general.add_option('--no-check-certificate', action='store_true', dest='no_check_certificate', default=False, help='Suppress HTTPS certificate validation.')
general.add_option('--cache-dir', dest='cachedir', default=u'~/.youtube-dl/cache', help='Location in the filesystem where youtube-dl can store downloaded information permanently. NONE to disable filesystem caching, %default by default')
selection.add_option('--playlist-start',
@ -272,6 +273,10 @@ def parseOpts(overrideArguments=None):
verbosity.add_option('--dump-intermediate-pages',
action='store_true', dest='dump_intermediate_pages', default=False,
help='print downloaded pages to debug problems(very verbose)')
verbosity.add_option('--youtube-print-sig-code',
action='store_true', dest='youtube_print_sig_code', default=False,
help=optparse.SUPPRESS_HELP)
filesystem.add_option('-t', '--title',
action='store_true', dest='usetitle', help='use title in file name (default)', default=False)
@ -613,6 +618,7 @@ def _real_main(argv=None):
'min_filesize': opts.min_filesize,
'max_filesize': opts.max_filesize,
'daterange': date,
'youtube_print_sig_code': opts.youtube_print_sig_code
})
if opts.verbose:

69
youtube_dl/extractor/youtube.py
View File

@ -1,13 +1,13 @@
# coding: utf-8
import collections
import errno
import itertools
import io
import json
import operator
import os.path
import re
import shutil
import socket
import string
import struct
@ -17,6 +17,7 @@ import zlib
from .common import InfoExtractor, SearchInfoExtractor
from .subtitles import SubtitlesInfoExtractor
from ..utils import (
compat_chr,
compat_http_client,
compat_parse_qs,
compat_urllib_error,
@ -30,6 +31,7 @@ from ..utils import (
unescapeHTML,
unified_strdate,
orderedSet,
write_json_file,
)
class YoutubeBaseInfoExtractor(InfoExtractor):
@ -433,18 +435,18 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
# Read from filesystem cache
func_id = '%s_%s_%d' % (player_type, player_id, slen)
assert os.path.basename(func_id) == func_id
cache_dir = self.downloader.params.get('cachedir',
u'~/.youtube-dl/cache')
cache_dir = self._downloader.params.get('cachedir',
u'~/.youtube-dl/cache')
if cache_dir is not False:
if cache_dir != u'NONE':
cache_fn = os.path.join(os.path.expanduser(cache_dir),
u'youtube-sigfuncs',
func_id + '.json')
try:
with io.open(cache_fn, '', encoding='utf-8') as cachef:
with io.open(cache_fn, 'r', encoding='utf-8') as cachef:
cache_spec = json.load(cachef)
return lambda s: u''.join(s[i] for i in cache_spec)
except OSError:
except IOError:
pass # No cache available
if player_type == 'js':
@ -464,13 +466,55 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
assert False, 'Invalid player type %r' % player_type
if cache_dir is not False:
cache_res = res(map(compat_chr, range(slen)))
cache_spec = [ord(c) for c in cache_res]
shutil.makedirs(os.path.dirname(cache_fn))
write_json_file(cache_spec, cache_fn)
try:
cache_res = res(map(compat_chr, range(slen)))
cache_spec = [ord(c) for c in cache_res]
try:
os.makedirs(os.path.dirname(cache_fn))
except OSError as ose:
if ose.errno != errno.EEXIST:
raise
write_json_file(cache_spec, cache_fn)
except Exception as e:
tb = traceback.format_exc()
self._downloader.report_warning(
u'Writing cache to %r failed: %s' % (cache_fn, tb))
return res
def _print_sig_code(self, func, slen):
def gen_sig_code(idxs):
def _genslice(start, end, step):
starts = u'' if start == 0 else str(start)
ends = u':%d' % (end+step)
steps = u'' if step == 1 else (':%d' % step)
return u's[%s%s%s]' % (starts, ends, steps)
step = None
for i, prev in zip(idxs[1:], idxs[:-1]):
if step is not None:
if i - prev == step:
continue
yield _genslice(start, prev, step)
step = None
continue
if i - prev in [-1, 1]:
step = i - prev
start = prev
continue
else:
yield u's[%d]' % prev
if step is None:
yield u's[%d]' % i
else:
yield _genslice(start, i, step)
cache_res = func(map(compat_chr, range(slen)))
cache_spec = [ord(c) for c in cache_res]
expr_code = u' + '.join(gen_sig_code(cache_spec))
code = u'if len(s) == %d:\n return %s\n' % (slen, expr_code)
self.to_screen(u'Extracted signature:\n' + code)
def _parse_sig_js(self, jscode):
funcname = self._search_regex(
r'signature=([a-zA-Z]+)', jscode,
@ -1007,7 +1051,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
video_id, player_url, len(s)
)
self._player_cache[player_url] = func
return self._player_cache[player_url](s)
func = self._player_cache[player_url]
if self._downloader.params.get('youtube_print_sig_code'):
self._print_sig_code(func, len(s))
return func(s)
except Exception as e:
tb = traceback.format_exc()
self._downloader.report_warning(