146 lines
4.0 KiB
Python
146 lines
4.0 KiB
Python
# -*- Mode: Python; test-case-name: whipper.test.test_common_accurip -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# Copyright (C) 2009 Thomas Vander Stichele
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# This file is part of whipper.
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#
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# whipper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# whipper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with whipper. If not, see <http://www.gnu.org/licenses/>.
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import errno
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import os
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import struct
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import urlparse
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import urllib2
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from whipper.common import directory
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import logging
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logger = logging.getLogger(__name__)
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_CACHE_DIR = directory.cache_path()
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class AccuCache:
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def __init__(self):
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if not os.path.exists(_CACHE_DIR):
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logger.debug('Creating cache directory %s', _CACHE_DIR)
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os.makedirs(_CACHE_DIR)
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def _getPath(self, url):
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# split path starts with /
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return os.path.join(_CACHE_DIR, urlparse.urlparse(url)[2][1:])
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def retrieve(self, url, force=False):
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logger.debug("Retrieving AccurateRip URL %s", url)
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path = self._getPath(url)
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logger.debug("Cached path: %s", path)
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if force:
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logger.debug("forced to download")
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self.download(url)
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elif not os.path.exists(path):
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logger.debug("%s does not exist, downloading", path)
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self.download(url)
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if not os.path.exists(path):
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logger.debug("%s does not exist, not in database", path)
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return None
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data = self._read(url)
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return getAccurateRipResponses(data)
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def download(self, url):
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# FIXME: download url as a task too
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try:
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handle = urllib2.urlopen(url)
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data = handle.read()
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except urllib2.HTTPError, e:
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if e.code == 404:
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return None
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else:
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raise
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self._cache(url, data)
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return data
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def _cache(self, url, data):
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path = self._getPath(url)
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try:
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os.makedirs(os.path.dirname(path))
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except OSError, e:
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logger.debug('Could not make dir %s: %r' % (
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path, str(e)))
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if e.errno != errno.EEXIST:
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raise
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handle = open(path, 'wb')
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handle.write(data)
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handle.close()
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def _read(self, url):
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logger.debug("Reading %s from cache", url)
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path = self._getPath(url)
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handle = open(path, 'rb')
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data = handle.read()
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handle.close()
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return data
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def getAccurateRipResponses(data):
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ret = []
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while data:
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trackCount = struct.unpack("B", data[0])[0]
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nbytes = 1 + 12 + trackCount * (1 + 8)
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ret.append(AccurateRipResponse(data[:nbytes]))
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data = data[nbytes:]
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return ret
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class AccurateRipResponse(object):
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"""
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I represent the response of the AccurateRip online database.
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@type checksums: list of str
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"""
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trackCount = None
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discId1 = ""
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discId2 = ""
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cddbDiscId = ""
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confidences = None
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checksums = None
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def __init__(self, data):
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self.trackCount = struct.unpack("B", data[0])[0]
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self.discId1 = "%08x" % struct.unpack("<L", data[1:5])[0]
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self.discId2 = "%08x" % struct.unpack("<L", data[5:9])[0]
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self.cddbDiscId = "%08x" % struct.unpack("<L", data[9:13])[0]
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self.confidences = []
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self.checksums = []
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pos = 13
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for _ in range(self.trackCount):
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confidence = struct.unpack("B", data[pos])[0]
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checksum = "%08x" % struct.unpack("<L", data[pos + 1:pos + 5])[0]
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pos += 9
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self.confidences.append(confidence)
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self.checksums.append(checksum)
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