feat: speed up responding to queries (#1266)

src/zeroconf/_dns.pxd

@@ -136,3 +136,5 @@ cdef class DNSRRSet:
         record_sets=cython.list,
     )
     cdef cython.dict _get_lookup(self)
+
+    cpdef cython.set lookup_set(self)

src/zeroconf/_dns.py

@@ -22,7 +22,7 @@
 
 import enum
 import socket
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union, cast
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Set, Union, cast
 
 from ._exceptions import AbstractMethodException
 from ._utils.net import _is_v6_address
@@ -533,6 +533,10 @@ def lookup(self) -> Dict[DNSRecord, float]:
         """Return the lookup table."""
         return self._get_lookup()
 
+    def lookup_set(self) -> Set[DNSRecord]:
+        """Return the lookup table as aset."""
+        return set(self._get_lookup())
+
     def _get_lookup(self) -> Dict[DNSRecord, float]:
         """Return the lookup table, building it if needed."""
         if self._lookup is None:

src/zeroconf/_handlers/query_handler.pxd

@@ -59,7 +59,7 @@ cdef class QueryHandler:
     cdef _add_address_answers(self, str lower_name, cython.dict answer_set, DNSRRSet known_answers, cython.uint type_)
 
     @cython.locals(question_lower_name=str, type_=cython.uint, service=ServiceInfo)
-    cdef _answer_question(self, DNSQuestion question, DNSRRSet known_answers)
+    cdef cython.dict _answer_question(self, DNSQuestion question, DNSRRSet known_answers)
 
     @cython.locals(
         msg=DNSIncoming,
@@ -68,4 +68,4 @@ cdef class QueryHandler:
         known_answers=DNSRRSet,
         known_answers_set=cython.set,
     )
-    cpdef async_response(self, cython.list msgs, object unicast_source)
+    cpdef async_response(self, cython.list msgs, cython.bint unicast_source)

src/zeroconf/_handlers/query_handler.py

@@ -268,12 +268,12 @@ def async_response(  # pylint: disable=unused-argument
 
         for msg in msgs:
             for question in msg.questions:
-                if not question.unicast:
+                if not question.unique:  # unique and unicast are the same flag
                     if not known_answers_set:  # pragma: no branch
-                        known_answers_set = set(known_answers.lookup)
+                        known_answers_set = known_answers.lookup_set()
                     self.question_history.add_question_at_time(question, msg.now, known_answers_set)
                 answer_set = self._answer_question(question, known_answers)
-                if not ucast_source and question.unicast:
+                if not ucast_source and question.unique:  # unique and unicast are the same flag
                     query_res.add_qu_question_response(answer_set)
                     continue
                 if ucast_source: