add CallLaterManager

lbrynet/core/call_later_manager.py

@@ -0,0 +1,63 @@
+class CallLaterManager(object):
+    _callLater = None
+    _pendingCallLaters = []
+
+    @classmethod
+    def _cancel(cls, call_later):
+        """
+        :param call_later: DelayedCall
+        :return: (callable) canceller function
+        """
+
+        def cancel(reason=None):
+            """
+            :param reason: reason for cancellation, this is returned after cancelling the DelayedCall
+            :return: reason
+            """
+
+            if call_later.active():
+                call_later.cancel()
+            cls._pendingCallLaters.remove(call_later)
+            return reason
+        return cancel
+
+    @classmethod
+    def stop(cls):
+        """
+        Cancel any callLaters that are still running
+        """
+
+        from twisted.internet import defer
+        while cls._pendingCallLaters:
+            canceller = cls._cancel(cls._pendingCallLaters[0])
+            try:
+                canceller()
+            except (defer.CancelledError, defer.AlreadyCalledError):
+                pass
+
+    @classmethod
+    def call_later(cls, when, what, *args, **kwargs):
+        """
+        Schedule a call later and get a canceller callback function
+
+        :param when: (float) delay in seconds
+        :param what: (callable)
+        :param args: (*tuple) args to be passed to the callable
+        :param kwargs: (**dict) kwargs to be passed to the callable
+
+        :return: (tuple) twisted.internet.base.DelayedCall object, canceller function
+        """
+
+        call_later = cls._callLater(when, what, *args, **kwargs)
+        canceller = cls._cancel(call_later)
+        cls._pendingCallLaters.append(call_later)
+        return call_later, canceller
+
+    @classmethod
+    def setup(cls, callLater):
+        """
+        Setup the callLater function to use, supports the real reactor as well as task.Clock
+
+        :param callLater: (IReactorTime.callLater)
+        """
+        cls._callLater = callLater

lbrynet/dht/hashannouncer.py

@@ -1,7 +1,6 @@
 import binascii
 import collections
 import logging
-import time
 import datetime
 
 from twisted.internet import defer, task

lbrynet/dht/node.py

@@ -15,6 +15,7 @@ import logging
 from twisted.internet import defer, error, task
 
 from lbrynet.core.utils import generate_id
+from lbrynet.core.call_later_manager import CallLaterManager
 from lbrynet.core.PeerManager import PeerManager
 
 import constants
@@ -89,10 +90,11 @@ class Node(object):
             resolve = resolve or reactor.resolve
             callLater = callLater or reactor.callLater
             clock = clock or reactor
+        self.clock = clock
+        CallLaterManager.setup(callLater)
         self.reactor_resolve = resolve
         self.reactor_listenUDP = listenUDP
-        self.reactor_callLater = callLater
+        self.reactor_callLater = CallLaterManager.call_later
-        self.clock = clock
         self.node_id = node_id or self._generateID()
         self.port = udpPort
         self._listeningPort = None  # object implementing Twisted
@@ -856,7 +858,7 @@ class _IterativeFindHelper(object):
         if self._should_lookup_active_calls():
             # Schedule the next iteration if there are any active
             # calls (Kademlia uses loose parallelism)
-            call = self.node.reactor_callLater(constants.iterativeLookupDelay, self.searchIteration)
+            call, _ = self.node.reactor_callLater(constants.iterativeLookupDelay, self.searchIteration)
             self.pending_iteration_calls.append(call)
         # Check for a quick contact response that made an update to the shortList
         elif prevShortlistLength < len(self.shortlist):

lbrynet/dht/protocol.py

@@ -3,7 +3,8 @@ import time
 import socket
 import errno
 
-from twisted.internet import protocol, defer, error, task
+from twisted.internet import protocol, defer, task
+from lbrynet.core.call_later_manager import CallLaterManager
 
 import constants
 import encoding
@@ -169,17 +170,11 @@ class KademliaProtocol(protocol.DatagramProtocol):
             df._rpcRawResponse = True
 
         # Set the RPC timeout timer
-        timeoutCall = self._node.reactor_callLater(constants.rpcTimeout, self._msgTimeout, msg.id)
+        timeoutCall, cancelTimeout = self._node.reactor_callLater(constants.rpcTimeout, self._msgTimeout, msg.id)
         # Transmit the data
         self._send(encodedMsg, msg.id, (contact.address, contact.port))
         self._sentMessages[msg.id] = (contact.id, df, timeoutCall, method, args)
-
+        df.addErrback(cancelTimeout)
-        def cancel(err):
-            if timeoutCall.cancelled or timeoutCall.called:
-                return err
-            timeoutCall.cancel()
-
-        df.addErrback(cancel)
         return df
 
     def startProtocol(self):
@@ -340,12 +335,9 @@ class KademliaProtocol(protocol.DatagramProtocol):
         """Schedule the sending of the next UDP packet """
         delay = self._delay()
         key = object()
-        delayed_call = self._node.reactor_callLater(delay, self._write_and_remove, key, txData, address)
+        delayed_call, _ = self._node.reactor_callLater(delay, self._write_and_remove, key, txData, address)
-        self._call_later_list[key] = delayed_call
 
     def _write_and_remove(self, key, txData, address):
-        if key in self._call_later_list:
-            del self._call_later_list[key]
         if self.transport:
             try:
                 self.transport.write(txData, address)
@@ -440,7 +432,7 @@ class KademliaProtocol(protocol.DatagramProtocol):
         # See if any progress has been made; if not, kill the message
         if self._hasProgressBeenMade(messageID):
             # Reset the RPC timeout timer
-            timeoutCall = self._node.reactor_callLater(constants.rpcTimeout, self._msgTimeout, messageID)
+            timeoutCall, _ = self._node.reactor_callLater(constants.rpcTimeout, self._msgTimeout, messageID)
             self._sentMessages[messageID] = (remoteContactID, df, timeoutCall, method, args)
         else:
             # No progress has been made
@@ -469,15 +461,6 @@ class KademliaProtocol(protocol.DatagramProtocol):
         if self._bandwidth_stats_update_lc.running:
             self._bandwidth_stats_update_lc.stop()
 
-        for delayed_call in self._call_later_list.values():
+        CallLaterManager.stop()
-            try:
+
-                delayed_call.cancel()
-            except (error.AlreadyCalled, error.AlreadyCancelled):
-                log.debug('Attempted to cancel a DelayedCall that was not active')
-            except Exception:
-                log.exception('Failed to cancel a DelayedCall')
-                # not sure why this is needed, but taking this out sometimes causes
-                # exceptions.AttributeError: 'Port' object has no attribute 'socket'
-                # to happen on shutdown
-                # reactor.iterate()
         log.info('DHT stopped')

lbrynet/tests/unit/dht/test_protocol.py

@@ -1,7 +1,7 @@
 import time
 import unittest
 from twisted.internet.task import Clock
-from twisted.internet import defer
+from twisted.internet import defer, threads
 import lbrynet.dht.protocol
 import lbrynet.dht.contact
 import lbrynet.dht.constants
@@ -9,6 +9,7 @@ import lbrynet.dht.msgtypes
 from lbrynet.dht.error import TimeoutError
 from lbrynet.dht.node import Node, rpcmethod
 from lbrynet.tests.mocks import listenUDP, resolve
+from lbrynet.core.call_later_manager import CallLaterManager
 
 import logging
 
@@ -22,10 +23,12 @@ class KademliaProtocolTest(unittest.TestCase):
 
     def setUp(self):
         self._reactor = Clock()
+        CallLaterManager.setup(self._reactor.callLater)
         self.node = Node(node_id='1' * 48, udpPort=self.udpPort, externalIP="127.0.0.1", listenUDP=listenUDP,
                          resolve=resolve, clock=self._reactor, callLater=self._reactor.callLater)
 
     def tearDown(self):
+        CallLaterManager.stop()
         del self._reactor
 
     @defer.inlineCallbacks
@@ -40,7 +43,6 @@ class KademliaProtocolTest(unittest.TestCase):
 
     def testRPCTimeout(self):
         """ Tests if a RPC message sent to a dead remote node times out correctly """
-
         dead_node = Node(node_id='2' * 48, udpPort=self.udpPort, externalIP="127.0.0.2", listenUDP=listenUDP,
                          resolve=resolve, clock=self._reactor, callLater=self._reactor.callLater)
         dead_node.start_listening()