Remove unneeded dht saving state to separate file

The dht state is now saved by default in the session state by libtorrent

deluge/core/core.py

@@ -137,10 +137,6 @@ class Core(component.Component):
     def stop(self):
         log.debug("Core stopping...")
 
-        # Save the DHT state if necessary
-        if self.config["dht"]:
-            self.save_dht_state()
-
         # Save the libtorrent session state
         self.__save_session_state()
 
@@ -170,15 +166,6 @@ class Core(component.Component):
         except Exception, e:
             log.warning("Failed to load lt state: %s", e)
 
-    def save_dht_state(self):
-        """Saves the dht state to a file"""
-        try:
-            dht_data = open(deluge.configmanager.get_config_dir("dht.state"), "wb")
-            dht_data.write(lt.bencode(self.session.dht_state()))
-            dht_data.close()
-        except Exception, e:
-            log.warning("Failed to save dht state: %s", e)
-
     def get_new_release(self):
         log.debug("get_new_release")
         from urllib2 import urlopen

deluge/core/preferencesmanager.py

@@ -244,24 +244,12 @@ class PreferencesManager(component.Component):
 
     def _on_set_dht(self, key, value):
         log.debug("dht value set to %s", value)
-        state_file = deluge.configmanager.get_config_dir("dht.state")
         if value:
-            state = None
-            try:
-                state = lt.bdecode(open(state_file, "rb").read())
-            except Exception, e:
-                log.warning("Unable to read DHT state file: %s", e)
-
-            try:
-                self.session.start_dht(state)
-            except Exception, e:
-                log.warning("Restoring old DHT state failed: %s", e)
-                self.session.start_dht(None)
+            self.session.start_dht()
             self.session.add_dht_router("router.bittorrent.com", 6881)
             self.session.add_dht_router("router.utorrent.com", 6881)
             self.session.add_dht_router("router.bitcomet.com", 6881)
         else:
-            self.core.save_dht_state()
             self.session.stop_dht()
 
     def _on_set_upnp(self, key, value):