Fix maxcdn purge limit

readthedocs/cdn/purge.py

@@ -9,12 +9,20 @@ CDN_USERNAME = getattr(settings, 'CDN_USERNAME', None)
 CDN_KEY = getattr(settings, 'CDN_KEY', None)
 CDN_SECRET = getattr(settings, 'CDN_SECRET', None)
 
+
+def chunks(in_list, chunk_size):
+    """Yield successive n-sized chunks from l."""
+    for i in xrange(0, len(in_list), chunk_size):
+        yield in_list[i:i + chunk_size]
+
 if CDN_USERNAME and CDN_KEY and CDN_SECRET and CDN_SERVICE == 'maxcdn':
     from maxcdn import MaxCDN
     api = MaxCDN(CDN_USERNAME, CDN_KEY, CDN_SECRET)
 
     def purge(id, files):
-        return api.purge(id, files)
+        # We can only purge up to 250 files per request
+        for chunk in chunks(files, 200):
+            return api.purge(id, chunk)
 else:
     def purge(id, files):
         log.error("CDN not configured, can't purge files")