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[mixcloud] Try preview server first, then further numbers

This commit is contained in:
Roman Le Négrate 2015-03-16 00:20:06 +01:00 committed by Jaime Marquínez Ferrándiz
parent 7a757b7194
commit aae53774f2

View file

@ -1,6 +1,7 @@
from __future__ import unicode_literals
import re
import itertools
from .common import InfoExtractor
from ..compat import (
@ -45,20 +46,19 @@ class MixcloudIE(InfoExtractor):
},
}]
def _get_url(self, track_id, template_url):
server_count = 30
for i in range(server_count):
url = template_url % i
def _get_url(self, track_id, template_url, server_number):
boundaries = (1, 30)
for nr in server_numbers(server_number, boundaries):
url = template_url % nr
try:
# We only want to know if the request succeed
# don't download the whole file
self._request_webpage(
HEADRequest(url), track_id,
'Checking URL %d/%d ...' % (i + 1, server_count + 1))
'Checking URL %d/%d ...' % (nr, boundaries[-1]))
return url
except ExtractorError:
pass
return None
def _real_extract(self, url):
@ -72,12 +72,13 @@ class MixcloudIE(InfoExtractor):
preview_url = self._search_regex(
r'\s(?:data-preview-url|m-preview)="([^"]+)"', webpage, 'preview url')
song_url = preview_url.replace('/previews/', '/c/originals/')
server_number = int(self._search_regex(r'stream(\d+)', song_url, 'server number'))
template_url = re.sub(r'(stream\d*)', 'stream%d', song_url)
final_song_url = self._get_url(track_id, template_url)
final_song_url = self._get_url(track_id, template_url, server_number)
if final_song_url is None:
self.to_screen('Trying with m4a extension')
template_url = template_url.replace('.mp3', '.m4a').replace('originals/', 'm4a/64/')
final_song_url = self._get_url(track_id, template_url)
final_song_url = self._get_url(track_id, template_url, server_number)
if final_song_url is None:
raise ExtractorError('Unable to extract track url')
@ -114,3 +115,35 @@ class MixcloudIE(InfoExtractor):
'view_count': view_count,
'like_count': like_count,
}
def server_numbers(first, boundaries):
""" Server numbers to try in descending order of probable availability.
Starting from first (i.e. the number of the server hosting the preview file)
and going further and further up to the higher boundary and down to the
lower one in an alternating fashion. Namely:
server_numbers(2, (1, 5))
# Where the preview server is 2, min number is 1 and max is 5.
# Yields: 2, 3, 1, 4, 5
Why not random numbers or increasing sequences? Since from what I've seen,
full length files seem to be hosted on servers whose number is closer to
that of the preview; to be confirmed.
"""
zip_longest = getattr(itertools, 'zip_longest', None)
if zip_longest is None:
# python 2.x
zip_longest = itertools.izip_longest
if len(boundaries) != 2:
raise ValueError("boundaries should be a two-element tuple")
min, max = boundaries
highs = range(first + 1, max + 1)
lows = range(first - 1, min - 1, -1)
rest = filter(
None, itertools.chain.from_iterable(zip_longest(highs, lows)))
yield first
for n in rest:
yield n