cancel starting components if the reactor is stopped before startup has finished

-don't block starting the dht component on having found enough peers, only on setting up the protocol

lbrynet/daemon/Component.py

@@ -1,5 +1,6 @@
 import logging
 from twisted.internet import defer
+from twisted._threads import AlreadyQuit
 from ComponentManager import ComponentManager
 
 log = logging.getLogger(__name__)
@@ -52,6 +53,8 @@ class Component(object):
             result = yield defer.maybeDeferred(self.start)
             self._running = True
             defer.returnValue(result)
+        except (defer.CancelledError, AlreadyQuit):
+            pass
         except Exception as err:
             log.exception("Error setting up %s", self.component_name or self.__class__.__name__)
             raise err
@@ -62,6 +65,8 @@ class Component(object):
             result = yield defer.maybeDeferred(self.stop)
             self._running = False
             defer.returnValue(result)
+        except (defer.CancelledError, AlreadyQuit):
+            pass
         except Exception as err:
             log.exception("Error stopping %s", self.__class__.__name__)
             raise err

lbrynet/daemon/Components.py

@@ -248,8 +248,13 @@ class DHTComponent(Component):
             externalIP=CS.get_external_ip(),
             peerPort=self.peer_port
         )
-        yield self.dht_node.start(GCS('known_dht_nodes'))
-        log.info("Joined the dht")
+
+        self.dht_node.start_listening()
+        yield self.dht_node._protocol._listening
+        d = self.dht_node.joinNetwork(GCS('known_dht_nodes'))
+        d.addCallback(lambda _: self.dht_node.start_looping_calls())
+        d.addCallback(lambda _: log.info("Joined the dht"))
+        log.info("Started the dht")
 
     @defer.inlineCallbacks
     def stop(self):

lbrynet/daemon/Daemon.py

@@ -161,6 +161,7 @@ class Daemon(AuthJSONRPCServer):
             analytics_manager=self.analytics_manager,
             skip_components=conf.settings['components_to_skip']
         )
+        self._component_setup_deferred = None
 
         # TODO: move this to a component
         self.connected_to_internet = True
@@ -198,8 +199,9 @@ class Daemon(AuthJSONRPCServer):
 
         log.info("Starting lbrynet-daemon")
         log.info("Platform: %s", json.dumps(system_info.get_platform()))
-        yield self.component_manager.setup(**{n: lambda _, c: setattr(self, components[c.component_name], c.component)
-                                              for n in components.keys()})
+        self._component_setup_deferred = self.component_manager.setup(**{
+            n: lambda _, c: setattr(self, components[c.component_name], c.component) for n in components.keys()})
+        yield self._component_setup_deferred
         log.info("Started lbrynet-daemon")
 
     @staticmethod
@@ -223,6 +225,11 @@ class Daemon(AuthJSONRPCServer):
         if self.analytics_manager:
             self.analytics_manager.shutdown()
 
+        try:
+            self._component_setup_deferred.cancel()
+        except defer.CancelledError:
+            pass
+
         if self.component_manager is not None:
             d = self.component_manager.stop()
             d.addErrback(log.fail(), 'Failure while shutting down')

lbrynet/daemon/auth/server.py

@@ -214,6 +214,9 @@ class AuthJSONRPCServer(AuthorizedBase):
             log.error('lbrynet API failed to bind TCP %s:%i for listening', conf.settings['api_host'],
                       conf.settings['api_port'])
             reactor.fireSystemEvent("shutdown")
+        except defer.CancelledError:
+            log.info("shutting down before finished starting")
+            reactor.fireSystemEvent("shutdown")
         except Exception as err:
             self.analytics_manager.send_server_startup_error(str(err))
             log.exception('Failed to start lbrynet-daemon')

lbrynet/dht/node.py

@@ -281,7 +281,9 @@ class Node(MockKademliaHelper):
         yield self._protocol._listening
         # TODO: Refresh all k-buckets further away than this node's closest neighbour
         yield self.joinNetwork(known_node_addresses or [])
+        self.start_looping_calls()
 
+    def start_looping_calls(self):
         self.safe_start_looping_call(self._change_token_lc, constants.tokenSecretChangeInterval)
         # Start refreshing k-buckets periodically, if necessary
         self.safe_start_looping_call(self._refresh_node_lc, constants.checkRefreshInterval)