Added new config optons for PacketList

This allows the admin to set the number of packets to store
in the PacketList object for tracking.  For apps like IRC,
we need to store lots more packets to detect dupes.

aprsd/conf/common.py

@@ -110,6 +110,16 @@ aprsd_opts = [
         default=3,
         help="The number of times to send an ack packet in response to recieving a packet.",
     ),
+    cfg.IntOpt(
+        "packet_list_maxlen",
+        default=100,
+        help="The maximum number of packets to store in the packet list.",
+    ),
+    cfg.IntOpt(
+        "packet_list_stats_maxlen",
+        default=20,
+        help="The maximum number of packets to send in the stats dict for admin ui.",
+    ),
 ]
 
 watch_list_opts = [

aprsd/packets/packet_list.py

@@ -22,7 +22,7 @@ class PacketList(objectstore.ObjectStoreMixin):
     def __new__(cls, *args, **kwargs):
         if cls._instance is None:
             cls._instance = super().__new__(cls)
-            cls._maxlen = 100
+            cls._maxlen = CONF.packet_list_maxlen
             cls.data = {
                 "types": {},
                 "packets": OrderedDict(),
@@ -88,11 +88,22 @@ class PacketList(objectstore.ObjectStoreMixin):
 
     @wrapt.synchronized(lock)
     def stats(self, serializable=False) -> dict:
+        # limit the number of packets to return to 50
+        LOG.info(f"PacketList stats called len={len(self.data['packets'])}")
+        tmp = OrderedDict(reversed(list(self.data["packets"].items())))
+        pkts = []
+        count = 1
+        for packet in tmp:
+            pkts.append(tmp[packet])
+            count += 1
+            if count > CONF.packet_list_stats_maxlen:
+                break
+
         stats = {
             "total_tracked": self._total_rx + self._total_rx,
             "rx": self._total_rx,
             "tx": self._total_tx,
             "types": self.data["types"],
-            "packets": self.data["packets"],
+            "packets": pkts,
         }
         return stats

aprsd/threads/rx.py

@@ -115,14 +115,11 @@ class APRSDDupeRXThread(APRSDRXThread):
                 found = False
 
             if not found:
-                # If we are in the process of already ack'ing
-                # a packet, we should drop the packet
-                # because it's a dupe within the time that
-                # we send the 3 acks for the packet.
+                # We haven't seen this packet before, so we process it.
                 pkt_list.rx(packet)
                 self.packet_queue.put(packet)
             elif packet.timestamp - found.timestamp < CONF.packet_dupe_timeout:
-                # If the packet came in within 60 seconds of the
+                # If the packet came in within N seconds of the
                 # Last time seeing the packet, then we drop it as a dupe.
                 LOG.warning(f"Packet {packet.from_call}:{packet.msgNo} already tracked, dropping.")
             else: