def __init__(self):
super(LyricsWikiaSearchThread, self).__init__()
self.daemon = True
self._queue = Queue()
self._stopped = False
self._current = None
class LyricsWikiaSearchThread(threading.Thread):
TIMEOUT = 4.0
def __init__(self):
super(LyricsWikiaSearchThread, self).__init__()
self.daemon = True
self._queue = Queue()
self._stopped = False
self._current = None
def search_song(self, song, done_cb):
"""Trigger a new search, old ones will be canceled"""
assert song
assert done_cb
if not self.is_alive():
self.start()
self._current = song
while not self._queue.empty():
self._queue.get_nowait()
self._queue.put((song, done_cb))
def stop(self):
"""Stop all active searches, no callback will be called after this
returns.
"""
self._stopped = True
self._queue.put((None, None))
def __idle(self, song, func, *args, **kwargs):
def delayed():
if self._stopped or song is not self._current:
return
func(song, *args, **kwargs)
GLib.idle_add(delayed)
def _do_search(self, song):
"""Returns a URL or None"""
fetch_url = create_api_search_url(song)
try:
response = urlopen(fetch_url, timeout=self.TIMEOUT)
except EnvironmentError:
return
try:
xml = response.read()
except IOError:
return
try:
dom = minidom.parseString(xml)
except Exception:
# who knows...
return
page_id_nodes = dom.getElementsByTagName("page_id")
if not page_id_nodes or not page_id_nodes[0].hasChildNodes():
return
url_nodes = dom.getElementsByTagName("url")
try:
page = url_nodes[0].firstChild.data
except (IndexError, AttributeError):
return
else:
return page
def run(self):
while not self._stopped:
song, cb = self._queue.get()
if self._stopped:
break
result = self._do_search(song)
self.__idle(song, cb, result)
