Do a more thorough check when a bad try_list is detected (#2330)

* Do a more thorough check when a bad try_list is detected

* Improve idle job check and fix DNS lookup problem

* Loop through copy of article list and move nzf.reset_try_list below the article check

Closes #2320

sabnzbd/downloader.py

@@ -230,6 +230,7 @@ class Server:
         self.info = get_server_addrinfo(self.host, self.port)
         if not self.info:
             self.bad_cons += self.threads
+            self.info = False
         else:
             self.bad_cons = 0
         self.request = False

sabnzbd/nzbqueue.py

@@ -883,9 +883,14 @@ class NzbQueue:
     def stop_idle_jobs(self):
         """Detect jobs that have zero files left and send them to post processing"""
         # Only check servers that are active
-        nr_servers = len([server for server in sabnzbd.Downloader.servers[:] if server.active])
+        active_servers = [server for server in sabnzbd.Downloader.servers[:] if server.active]
+        nr_servers = len(active_servers)
         empty = []
 
+        if nr_servers <= 0:
+            logging.debug("Skipping stop_idle_jobs because no servers are active")
+            return
+
         for nzo in self.__nzo_list:
             if not nzo.futuretype and not nzo.files and nzo.status not in (Status.PAUSED, Status.GRABBING):
                 logging.info("Found idle job %s", nzo.final_name)
@@ -896,8 +901,16 @@ class NzbQueue:
             if len(nzo.try_list) >= nr_servers:
                 # Maybe the NZF's need a reset too?
                 for nzf in nzo.files:
+                    if nzo.removed_from_queue:
+                        break
+
                     if len(nzf.try_list) >= nr_servers:
-                        # We do not want to reset all article trylists, they are good
+                        # Check for articles where all active servers have already been tried
+                        for article in nzf.articles[:]:
+                            if article.all_servers_in_try_list(active_servers):
+                                sabnzbd.NzbQueue.register_article(article, success=False)
+                                nzo.increase_bad_articles_counter("missing_articles")
+
                         logging.info("Resetting bad trylist for file %s in job %s", nzf.filename, nzo.final_name)
                         nzf.reset_try_list()
 

sabnzbd/nzbstuff.py

@@ -112,11 +112,19 @@ class TryList:
     def __init__(self):
         self.try_list: List[Server] = []
 
-    def server_in_try_list(self, server: Server):
+    def server_in_try_list(self, server: Server) -> bool:
         """Return whether specified server has been tried"""
         with TRYLIST_LOCK:
             return server in self.try_list
 
+    def all_servers_in_try_list(self, servers: List[Server]) -> bool:
+        """Check if all servers have been tried"""
+        with TRYLIST_LOCK:
+            for server in servers:
+                if not server in self.try_list:
+                    return False
+        return True
+
     def add_to_try_list(self, server: Server):
         """Register server as having been tried already"""
         with TRYLIST_LOCK: