Fix #2310. Play by the 8tracks rules

youtube_dl/extractor/eighttracks.py

@@ -4,10 +4,12 @@ from __future__ import unicode_literals
 import json
 import random
 import re
+import time
 
 from .common import InfoExtractor
 from ..utils import (
     compat_str,
+    ExtractorError,
 )
 
 
@@ -112,14 +114,30 @@ class EightTracksIE(InfoExtractor):
         session = str(random.randint(0, 1000000000))
         mix_id = data['id']
         track_count = data['tracks_count']
+        duration = data['duration']
+        avg_song_duration = duration / track_count
         first_url = 'http://8tracks.com/sets/%s/play?player=sm&mix_id=%s&format=jsonh' % (session, mix_id)
         next_url = first_url
         entries = []
+
         for i in range(track_count):
+            
+            api_json = None
+            download_tries = 0
+
+            while api_json is None:
+                try:
                     api_json = self._download_webpage(
                         next_url, playlist_id,
                         note='Downloading song information %d/%d' % (i + 1, track_count),
                         errnote='Failed to download song information')
+                except ExtractorError:
+                    if download_tries > 3:
+                        raise
+                    else:
+                        ++download_tries
+                        time.sleep(avg_song_duration)
+
             api_data = json.loads(api_json)
             track_data = api_data['set']['track']
             info = {
@@ -131,6 +149,7 @@ class EightTracksIE(InfoExtractor):
                 'ext': 'm4a',
             }
             entries.append(info)
+
             next_url = 'http://8tracks.com/sets/%s/next?player=sm&mix_id=%s&format=jsonh&track_id=%s' % (
                 session, mix_id, track_data['id'])
         return {