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Cddb.py
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""" Python CDDB-Access
Access gnudb service from Python.
"""
import getpass, os, re, socket, subprocess, sys, urllib.parse, urllib.request
__version__ = "1.1.0"
class CommandException(RuntimeError):
status = None
text = None
def __init__(self, status, text):
super().__init__()
self.status = status
self.text = text
def runCommand(args):
p = subprocess.Popen(args,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True)
com = p.communicate()
rc = p.wait()
if rc:
raise CommandException(rc, " ".join(args) + ": " + com[1])
return com[0]
class CddbDisc:
category = None
discid = None
artist = None
title = None
def __init__(self, category, discid, artist, title):
self.category = category
self.discid = discid
self.artist = artist
self.title = title
class CddbDiscInfo:
discid = None
artist = None
title = None
year = None
genre = None
tracks = None
def __init__(self, discid, artist, title, year, genre, tracks):
self.discid = discid
self.artist = artist
self.title = title
self.year = year
self.genre = genre
self.tracks = tracks
class CddbServer:
def __init__(self, device = None, cddbServer = 'http://gnudb.gnudb.org/~cddb/cddb.cgi',
app = "PythonCddbServer", version = __version__):
self.device = "/dev/cdrom" if os.path.exists("/dev/cdrom") else "/dev/sr0"
if device:
self.device = device
self.cddbServer = cddbServer
self.host = socket.gethostname()
self.app = app
self.version = version
self.protocol = 5
self.code = 0
self.user = getpass.getuser()
if " " in self.user:
self.user = self.user.replace(" ","")
self.reArtistTitle = re.compile('(?P<Artist>[^\/]*)\/(?P<Title>[^\/]*)')
self.reCode = re.compile("[0-9]+.*")
self.reDISCID = re.compile("DISCID=(?P<DiscId>.*)")
self.reDTITLE = re.compile("DTITLE=(?P<DiscTitle>.*)")
self.reDYEAR = re.compile("DYEAR=(?P<DiscYear>.*)")
self.reDGENRE = re.compile("DGENRE=(?P<DiscGenre>.*)")
self.reTTITLE = re.compile("TTITLE(?P<TrackNum>[^=]*)=(?P<TrackTitle>.*)")
def getDiscs(self, discid = None):
discs = None
if not discid:
discid = runCommand(['discid', self.device])
if discid:
self.track_offset = map(int, discid.split()[2:-1])
self.disc_length = int(discid.split()[-1:][0]) * 75
query = urllib.parse.quote_plus(discid.rstrip())
url = "%s?cmd=cddb+query+%s&hello=%s+%s+%s+%s&proto=%d" % \
(self.cddbServer, query, self.user, self.host,
self.app, self.version, self.protocol)
res = urllib.request.urlopen(url)
header = res.readline().decode('latin-1').rstrip()
if self.reCode.match(header):
self.code = int(header.split(' ', 1)[0])
artist = ""
title = ""
if self.code == 200: # Exact match
info = header.split(' ', 3)
m = self.reArtistTitle.match(info[3])
if m:
artist = m.group('Artist').rstrip()
title = m.group('Title').lstrip()
if not discs: discs = []
discs.append( CddbDisc(info[1], info[2], artist, title) )
elif self.code == 210 or self.code == 211: # Multiple exact matches or inexact match
line = res.readline().decode('latin-1').rstrip()
while line != ".":
info = line.split(' ', 2)
m = self.reArtistTitle.match(info[2])
if m:
artist = m.group('Artist').rstrip()
title = m.group('Title').lstrip()
if not discs: discs = []
discs.append( CddbDisc(info[0], info[1], artist, title) )
line = res.readline().decode('latin-1').rstrip()
return discs
def getDiscInfo(self, disc):
discInfo = None
url = "%s?cmd=cddb+read+%s+%s&hello=%s+%s+%s+%s&proto=%d" % \
(self.cddbServer, disc.category, disc.discid,
self.user, self.host, self.app, self.version, self.protocol)
res = urllib.request.urlopen(url)
header = res.readline().decode('latin-1').rstrip()
self.code = int(header.split(' ', 1)[0])
if self.code == 210:
discid = None
title = None
year = None
genre = None
tracks = []
for line in res.readlines():
line = line.decode('latin-1').rstrip()
m = self.reDISCID.match(line)
if m:
discid = m.group("DiscId")
m = self.reDTITLE.match(line)
if m:
m = self.reArtistTitle.match(m.group("DiscTitle"))
if m:
artist = m.group('Artist').rstrip()
title = m.group('Title').lstrip()
m = self.reDYEAR.match(line)
if m:
year = m.group("DiscYear")
m = self.reDGENRE.match(line)
if m:
genre = m.group("DiscGenre")
m = self.reTTITLE.match(line)
if m:
if not tracks: tracks = []
tracks.append(m.group("TrackTitle"))
return CddbDiscInfo(discid, artist, title, year, genre, tracks)
return None
def status(self):
return self.code
def message(self):
if self.code == 0:
return ""
elif self.code == 200:
return "Found exact match"
elif self.code == 202:
return "No match found"
elif self.code == 210:
return "Ok"
elif self.code == 211:
return "Found inexact matches"
elif self.code == 401:
return "Specified CDDB entry not found"
elif self.code == 402:
return "Server error"
elif self.code == 403:
return "Database entry is corrupt"
elif self.code == 409:
return "No handshake"
else:
return "Unknown code %s" % self.code