Introduced Trouble(Exception) for more elegant non-fatal errors handling

youtube_dl/InfoExtractors.py

@@ -359,15 +359,16 @@ class YoutubeIE(InfoExtractor):
 		# closed captions
 		video_subtitles = None
 		if self._downloader.params.get('writesubtitles', False):
+			try:
 				self.report_video_subtitles_download(video_id)
 				request = urllib2.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
 				try:
 					srt_list = urllib2.urlopen(request).read()
 				except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-				self._downloader.trouble(u'WARNING: unable to download video subtitles: %s' % str(err))
+					raise Trouble(u'WARNING: unable to download video subtitles: %s' % str(err))
-			else:
 				srt_lang_list = re.findall(r'lang_code="([\w\-]+)"', srt_list)
-				if srt_lang_list:
+				if not srt_lang_list:
+					raise Trouble(u'WARNING: video has no closed captions')
 				if self._downloader.params.get('subtitleslang', False):
 					srt_lang = self._downloader.params.get('subtitleslang')
 				elif 'en' in srt_lang_list:
@@ -375,17 +376,15 @@ class YoutubeIE(InfoExtractor):
 				else:
 					srt_lang = srt_lang_list[0]
 				if not srt_lang in srt_lang_list:
-						self._downloader.trouble(u'WARNING: no closed captions found in the specified language')
+					raise Trouble(u'WARNING: no closed captions found in the specified language')
-					else:
 				request = urllib2.Request('http://video.google.com/timedtext?hl=en&lang=%s&v=%s' % (srt_lang, video_id))
 				try:
 					srt_xml = urllib2.urlopen(request).read()
 				except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-							self._downloader.trouble(u'WARNING: unable to download video subtitles: %s' % str(err))
+					raise Trouble(u'WARNING: unable to download video subtitles: %s' % str(err))
-						else:
 				video_subtitles = self._closed_captions_xml_to_srt(srt_xml.decode('utf-8'))
-				else:
+			except Trouble as trouble:
-					self._downloader.trouble(u'WARNING: video has no closed captions')
+				self._downloader.trouble(trouble[0])
 
 		# token
 		video_token = urllib.unquote_plus(video_info['token'][0])

youtube_dl/utils.py

@@ -290,6 +290,13 @@ class ContentTooShortError(Exception):
 		self.expected = expected
 
 
+class Trouble(Exception):
+	"""Trouble helper exception
+	
+	This is an exception to be handled with
+	FileDownloader.trouble
+	"""
+
 class YoutubeDLHandler(urllib2.HTTPHandler):
 	"""Handler for HTTP requests and responses.