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[youtube] Add filesystem signature cache

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This commit is contained in:
Philipp Hagemeister 2013-09-22 00:35:03 +02:00
parent 2f2ffea9ca
commit c4417ddb61
2 changed files with 30 additions and 7 deletions
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2
youtube_dl/FileDownloader.py
View File

@ -39,6 +39,8 @@ class FileDownloader(object):
test: Download only first bytes to test the downloader.
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.
"""
params = None

35
youtube_dl/extractor/youtube.py
View File

@ -4,8 +4,10 @@
import itertools
import io
import json
import netrc
import operator
import os.path
import re
import shutil
import socket
import string
import struct
@ -422,13 +424,28 @@ def report_rtmp_download(self):
"""Indicate the download will use the RTMP protocol."""
self.to_screen(u'RTMP download detected')
def _extract_signature_function(self, video_id, player_url):
id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9]+)\.(?P<ext>[a-z]+)$',
def _extract_signature_function(self, video_id, player_url, slen):
id_m = re.match(r'.*-(?P<id>[a-zA-Z0-9_-]+)\.(?P<ext>[a-z]+)$',
player_url)
player_type = id_m.group('ext')
player_id = id_m.group('id')
# TODO read from filesystem cache
# 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')
if cache_dir is not False:
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:
cache_spec = json.load(cachef)
return lambda s: u''.join(s[i] for i in cache_spec)
except OSError:
pass # No cache available
if player_type == 'js':
code = self._download_webpage(
@ -436,7 +453,7 @@ def _extract_signature_function(self, video_id, player_url):
note=u'Downloading %s player %s' % (player_type, player_id),
errnote=u'Download of %s failed' % player_url)
res = self._parse_sig_js(code)
elif player_tpye == 'swf':
elif player_type == 'swf':
urlh = self._request_webpage(
player_url, video_id,
note=u'Downloading %s player %s' % (player_type, player_id),
@ -446,7 +463,11 @@ def _extract_signature_function(self, video_id, player_url):
else:
assert False, 'Invalid player type %r' % player_type
# TODO write cache
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)
return res
@ -983,7 +1004,7 @@ def _decrypt_signature(self, s, video_id, player_url, age_gate=False):
try:
if player_url not in self._player_cache:
func = self._extract_signature_function(
video_id, player_url
video_id, player_url, len(s)
)
self._player_cache[player_url] = func
return self._player_cache[player_url](s)