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#!/usr/bin/env python
"""
LastFM Python class
Copyright (C) 2007 Olivier Mehani <shtrom@ssji.net>
$Id: lastfm.py 52 2007-11-03 23:19:00Z shtrom $
Python class to handily retrieve song information from a Last.fm account.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
__version__ = '$Revision: 64 $'
from urllib import urlopen
from xml.dom import minidom
from time import time
class LastFM:
# Where to fetch the played song information
LASTFM_FORMAT_URL = \
'http://ws.audioscrobbler.com/1.0/user/%s/recenttracks.xml'
# Delay in seconds after which the last song entry is considered too old tox
# be displayed.
MAX_DELAY = 600
ARTIST = 0
NAME = 1
ALBUM = 2
TIME = 3
def __init__(self, username, proxies=None):
"""
Create a new LastFM object.
username, the Last.fm username
proxies, the list of proxies to use to connect to the Last.fm data, as
expected by urllib.urlopen()
"""
self.setUsername(username)
self._proxies = proxies
self.scrobbling = False
self.updateData()
def __str__(self):
return 'Last.fm song tracker for user %s.%s' % (self._username,
self.formatSongTitle(
' Last song was \"%(n)s\" by \"%(a)s\" in album \"%(b)s\".'))
def getUsername(self):
return self._username
def setUsername(self, username):
self._username = username
self.lastSongs = []
def updateData(self):
"""
Fetch the last recent tracks list and update the object accordingly.
Return True if the last played time has changed, False otherwise.
"""
try:
xmldocument = urlopen(self.LASTFM_FORMAT_URL % self._username,
self._proxies)
xmltree = minidom.parse(xmldocument)
except:
print 'Error parsing XML from Last.fm...'
return False
if xmltree.childNodes.length != 1:
raise Exception('XML document not formed as expected')
recenttracks = xmltree.childNodes[0]
tracklist = recenttracks.getElementsByTagName('track')
# do not update if nothing more has been scrobbled since last time
if len(tracklist) > 0 and \
int(tracklist[0].getElementsByTagName('date')[0].
getAttribute('uts')) != self.getLastScrobbledTime():
self.lastSongs = []
for track in tracklist:
artistNode = track.getElementsByTagName('artist')[0]
if artistNode.firstChild:
artist = artistNode.firstChild.data
else:
artist = None
nameNode = track.getElementsByTagName('name')[0]
if nameNode.firstChild:
name = nameNode.firstChild.data
else:
name = None
albumNode = track.getElementsByTagName('album')[0]
if albumNode.firstChild:
album = albumNode.firstChild.data
else:
album = None
timeNode = track.getElementsByTagName('date')[0]
self.lastSongs.append((artist, name, album,
int(timeNode.getAttribute('uts'))))
self.scrobbling = True
return True
# if nothing has been scrobbled for too long, an update to the
# "currently" playing song should be made
if self.scrobbling and not self.lastSongIsRecent():
self.scrobbling = False
return True
return False
def getLastSong(self):
"""
Return the last played song as a tuple of (ARTIST, SONG, ALBUM, TIME).
"""
if len(self.lastSongs) < 1:
return None
return self.lastSongs[0]
def getLastScrobbledTime(self):
"""
Return the Unix time the last song was played.
"""
if len(self.lastSongs) < 1:
return 0
return self.lastSongs[0][self.TIME]
def timeSinceLastScrobbled(self, lst=None):
"""
Return the time in seconds since the last song has been scrobbled.
lst, the Unix time at which a song has been scrobbled, defaults to that
of the last song
"""
if lst is None:
lst = self.getLastScrobbledTime()
return int(time()) - lst
def lastSongIsRecent(self, delay=None):
"""
Return a boolean stating whether the last song has been played less
the specified delay earlier.
delay, the delay to use, defaults to self.MAX_DELAY
"""
if delay is None:
delay = self.MAX_DELAY
return self.timeSinceLastScrobbled() < delay
def getLastRecentSong(self, delay=None):
"""
Return the last *recently* played song.
"Recently" means that the song has been played less than delay
earlier.
delay, the delay to use, see lastSongIsRecent for the semantics
"""
self.updateData()
if self.lastSongIsRecent(delay):
return self.getLastSong()
return None
def formatSongTitle(self, formatString='%(a)s - %(n)s', songTuple=None):
"""
Format a song tuple according to a format string. This makes use of the
basic Python string formatting operations.
formatString, the string according to which the song should be formated:
"%(a)s" is replaced by the artist;
"%(n)s" is replaced by the name of the song;
"%(b)s" is replaced by the album;
defaults to "%s - %t".
songTuple, the tuple representing the song, defaults to the last song
"""
str = ''
if songTuple is None:
songTuple = self.getLastRecentSong()
if songTuple is not None:
dict = {
'a': songTuple[0],
'n': songTuple[1],
'b': songTuple[2]
}
str = formatString % dict
return str
# Fallback if the script is called directly
if __name__ == '__main__':
from sys import argv
from time import sleep
if len(argv) != 2:
raise Exception('Incorrect number of arguments. Only the Last.fm username is required.')
lfm = LastFM(argv[1])
print lfm
while 1:
if lfm.updateData():
print lfm.formatSongTitle()
sleep(60)
# vim: se ts=3:
|
