class PlaylistManager(object):
LOG = logging.getLogger(__name__)
def __init__(self):
media_cleaner = MediaCleaner()
# Utility for downloading files
self.downloader = ChunkedDownloader(media_cleaner)
self.playlist_id = None
self.playlist_update_time = None
def fetch_local_playlist(self):
try:
local_playlist = playlist_utils.get_stored_playlist()
# We do not download files here because it would defeat the purpose.
# We trust the files have either been downloaded
# or we start to download them the next time we download a playlist
# this way if the playlist has changed we don't unnecessarily download old files
return local_playlist
except:
self.LOG.info('No locally stored playlist')
return []
def fetch_remote_playlist_data(self):
headers = {'Authorization': AUTHORIZATION_HEADER}
self.LOG.debug('Fetching remote playlist from %s' % PLAYLIST_URL)
response = requests.get(
url=PLAYLIST_URL,
timeout=PLAYLIST_TIMEOUTS,
stream=False,
headers=headers,
verify=SERVER_VERIFY)
if response.status_code == 200:
self.LOG.debug('Fetched data: %s' % response.content)
return response.content
raise Exception('Wrong status from server while fetching playlist: %s' % response.status_code)
def fetch_playlist(self):
pl_data = self.fetch_remote_playlist_data()
if pl_data is None:
raise Exception("No playlist data received from server.")
self.LOG.debug('Parsing playlist')
media_url, playlist, playlist_id, playlist_update_time = playlist_utils.parse_playlist(pl_data)
self.LOG.debug('Playlist with id %s and update time %s parsed', playlist_id, playlist_update_time)
# check if the playlist is already in use by the device
# Note that this is always false when we have just started the app
# This is by design to make sure we have all the files
if self.playlist_id == playlist_id and self.playlist_update_time == playlist_update_time:
raise PlaylistNotChanged("Playlist data has not changed since last downloaded")
self.download_playlist_files(playlist, media_url)
playlist_utils.save_playlist_to_file(playlist)
# save new playlist id and update time after we have finished all the tasks
# that need to be performed when we download a playlist
self.playlist_id = playlist_id
self.playlist_update_time = playlist_update_time
return playlist, playlist_id, playlist_update_time
# NOTE: Also sets content_uri to local path to media file
def download_playlist_files(self, playlist, own_server_media_url):
self.downloader.set_hisra_net_loc(own_server_media_url)
for content in playlist:
if content.content_type == Media.WEB_PAGE:
continue # Web pages are not downloaded
try:
content.content_uri = self.downloader.download(content)
except Exception, e:
self.LOG.debug('Failed to download content, %s %s', content.content_uri, str(e))
raise
