fix: refresh LRU on suppression hit, restore cdef constants

bluetoothbot · bluetoothbot · commit 1b035fdff786 · 2026-05-20T03:21:11.000Z
diff --git a/src/zeroconf/_listener.pxd b/src/zeroconf/_listener.pxd
@@ -13,6 +13,8 @@ cdef object DEBUG_ENABLED
 cdef bint TYPE_CHECKING
 
 cdef cython.uint _MAX_MSG_ABSOLUTE
+cdef cython.uint _DUPLICATE_PACKET_SUPPRESSION_INTERVAL
+cdef cython.uint _RECENT_PACKETS_MAX
 
 
 cdef class AsyncListener:
diff --git a/src/zeroconf/_listener.py b/src/zeroconf/_listener.py
@@ -121,6 +121,13 @@ def _process_datagram_at_time(
             and (now - _DUPLICATE_PACKET_SUPPRESSION_INTERVAL) < recent[0]
             and not recent[1]
         ):
+            # Refresh LRU position so an actively-replayed payload is not
+            # evicted by _RECENT_PACKETS_MAX distinct neighbours arriving
+            # within the suppression interval. Preserve the original
+            # (now, qu) tuple so the suppression window stays bounded
+            # from the first observation rather than extending forever.
+            del recent_packets[data]
+            recent_packets[data] = recent
             # Guard against duplicate packets
             if debug:
                 log.debug(
