use locking on rss entries

screenless/bureau/publications/publications.py

@@ -239,6 +239,7 @@ class Publications(Bureau):
 
         for source in feeds:
             url = source["url"]
+            feedlock = threading.RLock()
 
             def fetch_feed(url, feed_data):
                 """
@@ -246,10 +247,12 @@ class Publications(Bureau):
                 """
                 try:
                     resp = requests.get(url, timeout=20.0)
-                    feed_data[url] = io.BytesIO(resp.content)
+                    with feedlock:
+                        feed_data[url] = io.BytesIO(resp.content)
                 except requests.ReadTimeout:
                     self.log.warning("Timeout reading RSS feed %s", url)
-                    feed_data[url] = None
+                    with feedlock:
+                        feed_data[url] = None
                     return
 
             thread = threading.Thread(target=fetch_feed, args=(url, feed_data))