Increased default discovery stamp value to 16

RNS/Discovery.py

@@ -8,6 +8,7 @@ import ipaddress
 import subprocess
 from threading import Lock
 from .vendor import umsgpack as msgpack
+from collections import deque
 
 NAME            = 0xFF
 TRANSPORT_ID    = 0xFE
@@ -31,7 +32,7 @@ APP_NAME = "rnstransport"
 
 class InterfaceAnnouncer():
     JOB_INTERVAL = 60
-    DEFAULT_STAMP_VALUE = 14
+    DEFAULT_STAMP_VALUE = 16
     WORKBLOCK_EXPAND_ROUNDS = 20
 
     DISCOVERABLE_INTERFACE_TYPES = ["BackboneInterface", "TCPServerInterface", "TCPClientInterface",
@@ -224,10 +225,14 @@ class InterfaceAnnounceHandler:
             RNS.log("You can install it with the command: pip install lxmf", RNS.LOG_CRITICAL)
             RNS.panic()
 
-        self.aspect_filter  = APP_NAME+".discovery.interface"
-        self.required_value = required_value
-        self.callback       = callback
-        self.stamper        = LXStamper
+        self.aspect_filter   = APP_NAME+".discovery.interface"
+        self.required_value  = required_value
+        self.callback        = callback
+        self.stamper         = LXStamper
+        self.valid_cache     = {}
+        self.valid_cache_max = 2048
+        self.invalid_cache   = deque(maxlen=2048)
+        self.validation_lock = threading.Lock()
 
     @staticmethod
     def sanitize_name(name):
@@ -250,21 +255,43 @@ class InterfaceAnnounceHandler:
                 app_data  = app_data[1:]
                 signed    = flags & self.FLAG_SIGNED
                 encrypted = flags & self.FLAG_ENCRYPTED
+                fullhash  = RNS.Identity.full_hash(app_data)
 
-                if encrypted:
-                    if not RNS.Transport.has_network_identity(): return
-                    app_data = RNS.Transport.network_identity.decrypt(app_data)
-                    if not app_data: return
+                if fullhash in self.invalid_cache:
+                    RNS.log(f"Ignored previously discovered interface with insufficient stamp value", RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
+                    return
 
-                stamp     = app_data[-self.stamper.STAMP_SIZE:]
-                packed    = app_data[:-self.stamper.STAMP_SIZE]
-                infohash  = RNS.Identity.full_hash(packed)
-                workblock = self.stamper.stamp_workblock(infohash, expand_rounds=InterfaceAnnouncer.WORKBLOCK_EXPAND_ROUNDS)
-                value     = self.stamper.stamp_value(workblock, stamp)
-                valid     = self.stamper.stamp_valid(stamp, self.required_value, workblock)
+                if fullhash in self.valid_cache:
+                    RNS.log(f"Discovery announce cache hit", RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
+                    cache_entry = self.valid_cache[fullhash]
+                    stamp       = cache_entry["stamp"]
+                    packed      = cache_entry["packed"]
+                    value       = cache_entry["value"]
+                    valid       = cache_entry["valid"]
+
+                else:
+                    if encrypted:
+                        if not RNS.Transport.has_network_identity(): return
+                        app_data = RNS.Transport.network_identity.decrypt(app_data)
+                        if not app_data: return
+
+                    if self.validation_lock.locked():
+                        RNS.log(f"Dropping received interface discovery announce, already validating other discovery stamp", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                        return
+
+                    with self.validation_lock:
+                        stamp     = app_data[-self.stamper.STAMP_SIZE:]
+                        packed    = app_data[:-self.stamper.STAMP_SIZE]
+                        infohash  = RNS.Identity.full_hash(packed)
+                        workblock = self.stamper.stamp_workblock(infohash, expand_rounds=InterfaceAnnouncer.WORKBLOCK_EXPAND_ROUNDS)
+                        value     = self.stamper.stamp_value(workblock, stamp)
+                        valid     = self.stamper.stamp_valid(stamp, self.required_value, workblock)
+                        self.valid_cache[fullhash] = {"valid": valid, "value": value, "packed": packed, "stamp": stamp}
+                        while len(self.valid_cache) > self.valid_cache_max: self.valid_cache.pop(next(iter(self.valid_cache)))
 
                 if not valid:
                     RNS.log(f"Ignored discovered interface with insufficient stamp value {value}", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                    self.invalid_cache.append(fullhash)
                     return
 
                 if value < self.required_value: RNS.log(f"Ignored discovered interface with stamp value {value}", RNS.LOG_DEBUG)

RNS/Identity.py

@@ -174,12 +174,9 @@ class Identity:
         else: return None
 
     @staticmethod
-    def save_known_destinations(background=False, recombine=True):
-        # TODO: Improve the storage method so we don't have to
-        # deserialize and serialize the entire table on every
-        # save, but the only changes. It might be possible to
-        # simply overwrite on exit now that every local client
-        # disconnect triggers a data persist.
+    def save_known_destinations(background=False, recombine=False):
+        if recombine: RNS.log(f"Recombining known destinations from disk cache on persist is deprecated, argument ignored", RNS.LOG_WARNING)
+        if RNS.Transport.owner.is_connected_to_shared_instance: return
         
         try:
             if hasattr(Identity, "saving_known_destinations"):
@@ -194,28 +191,9 @@ class Identity:
 
             Identity.saving_known_destinations = True
             save_start = time.time()
-
-            if recombine:
-                storage_known_destinations = {}
-                if os.path.isfile(RNS.Reticulum.storagepath+"/known_destinations"):
-                    try:
-                        with open(RNS.Reticulum.storagepath+"/known_destinations","rb") as file:
-                            storage_known_destinations = umsgpack.load(file)
-     
-                    except: pass
-
-                try:
-                    for destination_hash in storage_known_destinations:
-                        if not destination_hash in Identity.known_destinations:
-                            with Identity.known_destinations_lock:
-                                Identity.known_destinations[destination_hash] = storage_known_destinations[destination_hash]
-                
-                except Exception as e:
-                    RNS.log("Skipped recombining known destinations from disk, since an error occurred: "+str(e), RNS.LOG_WARNING)
-
             RNS.log("Saving "+str(len(Identity.known_destinations))+" known destinations to storage...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
-            temp_file = RNS.Reticulum.storagepath+f"/known_destinations.tmp.{time.time()}"
 
+            temp_file = RNS.Reticulum.storagepath+f"/known_destinations.tmp.{time.time()}"
             try:
                 with open(temp_file,"wb") as file: umsgpack.dump(Identity.known_destinations.copy(), file)
                 os.replace(temp_file, RNS.Reticulum.storagepath+f"/known_destinations")
@@ -226,17 +204,13 @@ class Identity:
                 except Exception as e: RNS.log(f"Could not clean up temporary file {temp_file}: {e}", RNS.LOG_WARNING)
                 raise e
 
-            save_time = time.time() - save_start
-            if save_time < 1: time_str = str(round(save_time*1000,2))+"ms"
-            else:             time_str = str(round(save_time,2))+"s"
-
-            RNS.log("Saved known destinations to storage in "+time_str, RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+            RNS.log(f"Saved known destinations to storage in {RNS.prettyshorttime(time.time()-save_start)}", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
 
         except Exception as e:
             RNS.log("Error while saving known destinations to disk, the contained exception was: "+str(e), RNS.LOG_ERROR)
             RNS.trace_exception(e)
 
-        Identity.saving_known_destinations = False
+        finally: Identity.saving_known_destinations = False
 
     @staticmethod
     def load_known_destinations():
@@ -308,7 +282,7 @@ class Identity:
         except Exception as e: RNS.log(f"Error while retaining identity {RNS.prettyhexrep(identity_hash)}: {e}", RNS.LOG_ERROR)
     
     @staticmethod
-    def clean_known_destinations():
+    def clean_known_destinations(background=False):
         now        = time.time()
         st         = now
         total      = len(Identity.known_destinations)
@@ -318,9 +292,13 @@ class Identity:
         never_used = 0
         ratchetdir = RNS.Reticulum.storagepath+"/ratchets"
 
+        RNS.log(f"Cleaning known destinations{' at background priority' if background else ''}...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+
         with Identity.known_destinations_lock: destination_hashes = list(Identity.known_destinations.keys())
         for destination_hash in destination_hashes:
             try:
+                if background: time.sleep(0.001) # Low priority, yield thread
+                RNS.Transport.destinations_last_cleaned = time.time()
                 if RNS.Transport.has_path(destination_hash): has_path = True
                 else:
                     has_path = False
@@ -366,7 +344,8 @@ class Identity:
                 if os.path.isfile(ratchet_path): os.unlink(ratchet_path)
             except Exception as e: RNS.log(f"Could not clean stale ratchets for {RNS.prettyhexrep(destination_hash)}: {e}", RNS.LOG_WARNING)
 
-        # RNS.log(f"Total destinations: {total}, stale: {len(stale)}, removed: {removed}, no path: {no_path}, never used: {never_used}, with path: {total-no_path}, used: {total-never_used}, retained: {retained}. Completed in {RNS.prettyshorttime(time.time()-st)}", RNS.LOG_WARNING) # TODO: Remove
+        RNS.log(f"Cleaned known destinations in {RNS.prettyshorttime(time.time()-st)}", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+        RNS.log(f"Total: {total}, stale: {len(stale)}, removed: {removed}, no path: {no_path}, never used: {never_used}, with path: {total-no_path}, used: {total-never_used}, retained: {retained}", RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
         if not RNS.Transport.owner.is_connected_to_shared_instance: Identity.save_known_destinations(recombine=False)
 
     @staticmethod

RNS/Interfaces/BackboneInterface.py

@@ -276,7 +276,9 @@ class BackboneInterface(Interface):
 
         try: BackboneInterface.epoll.unregister(fileno)
         except Exception as e:
-            RNS.log(f"An error occurred while deregistering file descriptor {fileno}: {e}", RNS.LOG_DEBUG)
+            if   str(e).endswith("No such file or directory"): pass
+            elif str(e).endswith("Bad file descriptor"):       pass
+            else: RNS.log(f"An error occurred while deregistering file descriptor {fileno}: {e}", RNS.LOG_DEBUG)
 
     @staticmethod
     def deregister_listeners():
@@ -296,7 +298,7 @@ class BackboneInterface(Interface):
                 try: BackboneInterface.epoll.modify(fileno, select.EPOLLOUT)
                 except Exception as e:
                     if   str(e).endswith("No such file or directory"): pass
-                    elif str(e).endswith("Bad file descriptor"): pass
+                    elif str(e).endswith("Bad file descriptor"):       pass
                     else: RNS.log(f"Error occurred on {interface} while modifying socket EPOLL state: {e}", RNS.LOG_WARNING)
                     raise e
 
@@ -342,8 +344,10 @@ class BackboneInterface(Interface):
                                         written = 0
                                         if not spawned_interface.detached:
                                             if RNS.sl(RNS.LOG_DEBUG):
-                                                if   str(e).endswith("Connection timed out"): pass
+                                                if   str(e).endswith("Connection timed out"):     pass
                                                 elif str(e).endswith("Connection reset by peer"): pass
+                                                elif str(e).endswith("No route to host"):         pass
+                                                elif str(e).endswith("Broken pipe"):              pass
                                                 else: RNS.log(f"Error while writing to {spawned_interface}: {e}", RNS.LOG_DEBUG)
                                         BackboneInterface.deregister_fileno(fileno)
 
@@ -398,7 +402,7 @@ class BackboneInterface(Interface):
                                             try: client_socket.close()
                                             except Exception as e: RNS.log(f"Error while closing socket for failed incoming connection: {e}", RNS.LOG_WARNING)
 
-                                    except:
+                                    except Exception as e:
                                         RNS.log(f"Accepting socket failed for incoming connection: {e}", RNS.LOG_WARNING)
                                         try: client_socket.close()
                                         except Exception as e: RNS.log(f"Error while closing socket for failed incoming socket accept: {e}", RNS.LOG_WARNING)
@@ -523,6 +527,11 @@ class BackboneInterface(Interface):
                             elif str(e).endswith("Bad file descriptor"): pass
                             else: RNS.log("Error while shutting down socket for "+str(self)+": "+str(e), RNS.LOG_ERROR)
 
+    @property
+    def blocked_ip_list(self):
+        if not self.block_fast_flapping: return []
+        else: return list(self.fast_flapping.keys())
+
     @property
     def blocked_ip_count(self):
         if not self.block_fast_flapping: return 0
@@ -659,7 +668,8 @@ class BackboneClientInterface(Interface):
                     try:
                         if self.socket != None: self.socket.shutdown(socket.SHUT_RDWR)
                     except Exception as e:
-                        if str(e).endswith("Transport endpoint is not connected"): pass
+                        if   str(e).endswith("Transport endpoint is not connected"): pass
+                        elif str(e).endswith("Bad file descriptor"):                 pass
                         else: RNS.log("Error while shutting down socket for "+str(self)+": "+str(e), RNS.LOG_ERROR)
 
                     try:
@@ -824,7 +834,7 @@ class BackboneClientInterface(Interface):
 
         else:
             RNS.log("The interface "+str(self)+" is being torn down.", RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
-            if self.parent_interface.block_fast_flapping and hasattr(self, "spawned_at"):
+            if self.parent_interface and self.parent_interface.block_fast_flapping and hasattr(self, "spawned_at"):
                 connected_time = time.time() - self.spawned_at
                 if connected_time < self.parent_interface.fast_flap_threshold:
                     try:

RNS/Interfaces/Interface.py

@@ -102,6 +102,7 @@ class Interface:
         self.online   = False
         self.bitrate  = 62500
         self.HW_MTU   = None
+        self.__hash   = None
 
         self.supports_discovery       = False
         self.discoverable             = False
@@ -139,7 +140,8 @@ class Interface:
         self.op_freq_deque = deque(maxlen=Interface.OA_FREQ_SAMPLES)
 
     def get_hash(self):
-        return RNS.Identity.full_hash(str(self).encode("utf-8"))
+        if not self.__hash: self.__hash = RNS.Identity.full_hash(str(self).encode("utf-8"))
+        return self.__hash
 
     # This is a generic function for determining when an interface
     # should activate ingress limiting. Since this can vary for
@@ -364,11 +366,9 @@ class Interface:
 
     @staticmethod
     def get_config_obj(config_in):
-        if type(config_in) == ConfigObj:
-            return config_in
+        if type(config_in) == ConfigObj: return config_in
         else:
-            try:
-                return ConfigObj(config_in)
+            try: return ConfigObj(config_in)
             except Exception as e:
                 RNS.log(f"Could not parse supplied configuration data. The contained exception was: {e}", RNS.LOG_ERROR)
                 raise SystemError("Invalid configuration data supplied")

RNS/Link.py

@@ -746,17 +746,17 @@ class Link:
                     last_inbound = max(max(self.last_inbound, self.last_proof), activated_at)
                     now = time.time()
 
-                    if now >= last_inbound + self.keepalive:
+                    if now >= last_inbound + self.keepalive or now >= self.last_outbound + self.keepalive:
                         if self.initiator and now >= self.last_keepalive + self.keepalive:
                             self.send_keepalive()
 
-                        if time.time() >= last_inbound + self.stale_time:
+                        if now >= last_inbound + self.stale_time:
                             sleep_time = self.rtt * self.keepalive_timeout_factor + Link.STALE_GRACE
                             self.status = Link.STALE
 
                         else: sleep_time = self.keepalive
                     
-                    else: sleep_time = (last_inbound + self.keepalive) - time.time()
+                    else: sleep_time = (last_inbound + self.keepalive) - now
 
                 elif self.status == Link.STALE:
                     sleep_time = 0.001
@@ -766,9 +766,9 @@ class Link:
                     self.link_closed()
 
 
-                if sleep_time == 0: RNS.log("Warning! Link watchdog sleep time of 0!", RNS.LOG_ERROR)
+                if sleep_time == 0: RNS.log(f"Link watchdog sleep time of 0 on {self}", RNS.LOG_ERROR)
                 if sleep_time == None or sleep_time < 0:
-                    RNS.log("Timing error! Tearing down link "+str(self)+" now.", RNS.LOG_ERROR)
+                    RNS.log(f"Timing error, tearing down link {self} now", RNS.LOG_ERROR)
                     self.teardown()
                     sleep_time = 0.1
 
@@ -1099,9 +1099,10 @@ class Link:
 
                     elif packet.context == RNS.Packet.KEEPALIVE:
                         if not self.initiator and packet.data == bytes([0xFF]):
-                            keepalive_packet = RNS.Packet(self, bytes([0xFE]), context=RNS.Packet.KEEPALIVE)
-                            keepalive_packet.send()
-                            self.had_outbound(is_keepalive = True)
+                            if time.time() >= self.last_outbound + self.keepalive:
+                                keepalive_packet = RNS.Packet(self, bytes([0xFE]), context=RNS.Packet.KEEPALIVE)
+                                keepalive_packet.send()
+                                self.had_outbound(is_keepalive = True)
 
 
                     # TODO: find the most efficient way to allow multiple

RNS/Reticulum.py

@@ -1418,6 +1418,9 @@ class Reticulum:
                 if hasattr(interface, "blocked_ip_count"):
                     ifstats["blocked_ips"] = interface.blocked_ip_count
 
+                if hasattr(interface, "blocked_ip_list"):
+                    ifstats["blocked_ip_list"] = interface.blocked_ip_list
+
                 ifstats["name"]                        = str(interface)
                 ifstats["short_name"]                  = str(interface.name)
                 ifstats["hash"]                        = interface.get_hash()

RNS/Transport.py

@@ -238,16 +238,19 @@ class Transport:
 
             if RNS.Reticulum.local_hops_delta(): Transport.local_hops_delta = (ord(os.urandom(1))%6)+2
 
-        packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
-        if not Transport.owner.is_connected_to_shared_instance:
+        packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist.raw"
+        if RNS.Reticulum.transport_enabled() and not Transport.owner.is_connected_to_shared_instance:
             if os.path.isfile(packet_hashlist_path):
                 try:
-                    file = open(packet_hashlist_path, "rb")
-                    hashlist_data = umsgpack.unpackb(file.read())
-                    Transport.packet_hashlist = set(hashlist_data)
-                    file.close()
-                except Exception as e:
-                    RNS.log("Could not load packet hashlist from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
+                    with open(packet_hashlist_path, "rb") as file:
+                        hashlen = RNS.Identity.HASHLENGTH//8
+                        done = False
+                        while not done:
+                            packet_hash = file.read(hashlen)
+                            if len(packet_hash) == hashlen: Transport.packet_hashlist.add(packet_hash)
+                            else: done = True
+
+                except Exception as e: RNS.log("Could not load packet hashlist from storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
 
         Transport.reload_blackhole()
 
@@ -966,7 +969,10 @@ class Transport:
                 # Clean known destinations
                 if time.time() > Transport.destinations_last_cleaned+Transport.known_destinations_interval:
                     Transport.destinations_last_cleaned = time.time()
-                    def job(): RNS.Identity.clean_known_destinations()
+                    def job():
+                        try: RNS.Identity.clean_known_destinations(background=True)
+                        except Exception as e: RNS.log(f"Error while running scheduled known destinations cleaning: {e}", RNS.LOG_ERROR)
+                        finally: Transport.destinations_last_cleaned = time.time()
                     threading.Thread(target=job, daemon=True).start()
 
                 # Send announces for management destinations
@@ -2226,7 +2232,7 @@ class Transport:
                                         else: RNS.log("Invalid link request proof in transport for link "+RNS.prettyhexrep(packet.destination_hash)+", dropping proof.", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
                                 except Exception as e: RNS.log("Could not transport link request proof. The contained exception was: "+str(e), RNS.LOG_DEBUG) if RNS.sl(LOG_DEBUG) else None
                             else: RNS.log("Link request proof received on wrong interface, not transporting it.", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
-                        else: RNS.log(f"Received link request proof with hop mismatch ({packet.hops}/{link_entry[IDX_LT_NH_IF]}), not transporting it", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                        else: RNS.log(f"Received link request proof with hop mismatch ({packet.hops}/{link_entry[IDX_LT_REM_HOPS]}:{link_entry[IDX_LT_NH_IF]}->{link_entry[IDX_LT_RCVD_IF]}), not transporting it", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
                     
                     else:
                         # Check if we can deliver it to a local
@@ -2513,6 +2519,10 @@ class Transport:
 
         gc.collect()
 
+    @staticmethod
+    def interface_hashes():
+        return {interface.get_hash() for interface in Transport.interfaces}
+
     @staticmethod
     def find_interface_from_hash(interface_hash):
         for interface in Transport.interfaces:
@@ -3222,6 +3232,7 @@ class Transport:
     @staticmethod
     def save_packet_hashlist(background=False):
         if not Transport.owner.is_connected_to_shared_instance:
+            if not RNS.Reticulum.transport_enabled(): return
             if hasattr(Transport, "saving_packet_hashlist"):
                 wait_interval = 0.2
                 wait_timeout = 5
@@ -3236,23 +3247,28 @@ class Transport:
                 Transport.saving_packet_hashlist = True
                 save_start = time.time()
 
-                if not RNS.Reticulum.transport_enabled(): Transport.packet_hashlist = set()
-                else: RNS.log("Saving packet hashlist to storage...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                if RNS.Reticulum.transport_enabled(): RNS.log("Saving packet hashlist to storage...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                else: return
 
-                packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist"
-                file = open(packet_hashlist_path, "wb")
-                file.write(umsgpack.packb(list(Transport.packet_hashlist.copy())))
-                file.close()
+                round_started_at = save_start
+                yield_threshold  = 0.010
 
-                save_time = time.time() - save_start
-                if save_time < 1: time_str = str(round(save_time*1000,2))+"ms"
-                else: time_str = str(round(save_time,2))+"s"
-                RNS.log("Saved packet hashlist in "+time_str, RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                packet_hashlist_path = RNS.Reticulum.storagepath+"/packet_hashlist.raw"
+                with open(packet_hashlist_path, "wb") as file:
+                    for packet_hash in Transport.packet_hashlist.copy():
+                        if background:
+                            if time.time() - round_started_at > yield_threshold:
+                                # Low priority, yield thread
+                                round_started_at = time.time()
+                                time.sleep(0.001)
 
-            except Exception as e:
-                RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
+                        file.write(packet_hash)
+
+                RNS.log(f"Saved packet hashlist in {RNS.prettyshorttime(time.time()-save_start)}", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+
+            except Exception as e: RNS.log("Could not save packet hashlist to storage, the contained exception was: "+str(e), RNS.LOG_ERROR)
+            finally: Transport.saving_packet_hashlist = False
 
-            Transport.saving_packet_hashlist = False
             gc.collect()
 
 
@@ -3274,40 +3290,52 @@ class Transport:
                 save_start = time.time()
                 RNS.log("Saving path table to storage...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
 
-                serialised_destinations = []
-                path_table = Transport.path_table.copy()
+                serialised_destinations     = []
+                path_table                  = Transport.path_table.copy()
+                interface_hashes_updated_at = 0
+                round_started_at            = save_start
+                yield_threshold             = 0.010
+
                 for destination_hash in path_table:
+                    if background:
+                        if time.time() - round_started_at > yield_threshold:
+                            # Low priority, yield thread
+                            round_started_at = time.time()
+                            time.sleep(0.001)
                     try:
+                        # Throttle interface hash lookup to 2 seconds
+                        if time.time() > interface_hashes_updated_at + 2:
+                            interface_hashes = Transport.interface_hashes()
+
                         # Get the destination entry from the destination table
-                        de = path_table[destination_hash]
-                        interface_hash = de[IDX_PT_RVCD_IF].get_hash()
+                        de        = path_table[destination_hash]
+                        interface = de[IDX_PT_RVCD_IF]
 
                         # Only store destination table entry if the associated
                         # interface is still active
-                        interface = Transport.find_interface_from_hash(interface_hash)
-                        if interface != None:
+                        if not interface.get_hash() in interface_hashes: RNS.log(f"Skipping persist for path table entry {RNS.prettyhexrep(destination_hash)}, interface {interface} no longer active", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
+                        else:
                             # Get the destination entry from the destination table
                             if not destination_hash in path_table:
                                 RNS.log(f"Skipping persist for path table entry {RNS.prettyhexrep(destination_hash)}, no longer in table", RNS.LOG_PATHING) if RNS.sl(RNS.LOG_PATHING) else None
 
-                            de = path_table[destination_hash]
-                            timestamp = de[IDX_PT_TIMESTAMP]
-                            received_from = de[IDX_PT_NEXT_HOP]
-                            hops = de[IDX_PT_HOPS]
-                            expires = de[IDX_PT_EXPIRES]
-                            random_blobs = de[IDX_PT_RANDBLOBS]
-                            packet_hash = de[IDX_PT_PACKET]
+                            de             = path_table[destination_hash]
+                            timestamp      = de[IDX_PT_TIMESTAMP]
+                            received_from  = de[IDX_PT_NEXT_HOP]
+                            hops           = de[IDX_PT_HOPS]
+                            expires        = de[IDX_PT_EXPIRES]
+                            random_blobs   = de[IDX_PT_RANDBLOBS]
+                            packet_hash    = de[IDX_PT_PACKET]
+                            interface_hash = interface.get_hash()
 
-                            serialised_entry = [
-                                destination_hash,
-                                timestamp,
-                                received_from,
-                                hops,
-                                expires,
-                                random_blobs,
-                                interface_hash,
-                                packet_hash
-                            ]
+                            serialised_entry = [ destination_hash,
+                                                 timestamp,
+                                                 received_from,
+                                                 hops,
+                                                 expires,
+                                                 random_blobs,
+                                                 interface_hash,
+                                                 packet_hash ]
 
                             serialised_destinations.append(serialised_entry)
 
@@ -3353,7 +3381,16 @@ class Transport:
                 RNS.log("Saving tunnel table to storage...", RNS.LOG_DEBUG) if RNS.sl(RNS.LOG_DEBUG) else None
 
                 serialised_tunnels = []
+                round_started_at   = save_start
+                yield_threshold    = 0.010
+
                 for tunnel_id in Transport.tunnels.copy():
+                    if background:
+                        if time.time() - round_started_at > yield_threshold:
+                            # Low priority, yield thread
+                            round_started_at = time.time()
+                            time.sleep(0.001)
+
                     te = Transport.tunnels[tunnel_id]
                     interface = te[1]
                     tunnel_paths = te[2].copy()

RNS/_version.py

@@ -1 +1 @@
-__version__ = "1.3.9"
+__version__ = "1.4.0"