python-zeroconf
diff --git a/‎build_ext.py
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+1Lines changed: 1 addition & 0 deletions b/‎build_ext.py
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+1Lines changed: 1 addition & 0 deletions
diff --git a/‎src/zeroconf/_services/registry.pxd
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+18Lines changed: 18 additions & 0 deletions b/‎src/zeroconf/_services/registry.pxd
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+18Lines changed: 18 additions & 0 deletions
diff --git a/‎src/zeroconf/_services/registry.py
Copy file name to clipboardExpand all lines: src/zeroconf/_services/registry.py
+4-1Lines changed: 4 additions & 1 deletion b/‎src/zeroconf/_services/registry.py
Copy file name to clipboardExpand all lines: src/zeroconf/_services/registry.py
+4-1Lines changed: 4 additions & 1 deletion
@@ -28,6 +28,7 @@ def build(setup_kwargs: Any) -> None:
                         "src/zeroconf/_listener.py",
                         "src/zeroconf/_protocol/incoming.py",
                         "src/zeroconf/_protocol/outgoing.py",
+                        "src/zeroconf/_services/registry.py",
                     ],
                     compiler_directives={"language_level": "3"},  # Python 3
                 ),
 
@@ -0,0 +1,18 @@
+
+import cython
+
+
+cdef class ServiceRegistry:
+
+    cdef cython.dict _services
+    cdef public cython.dict types
+    cdef public cython.dict servers
+
+    @cython.locals(
+        record_list=cython.list,
+    )
+    cdef _async_get_by_index(self, cython.dict records, str key)
+
+    cdef _add(self, object info)
+
+    cdef _remove(self, cython.list infos)
@@ -78,7 +78,10 @@ def async_get_infos_server(self, server: str) -> List[ServiceInfo]:
 
     def _async_get_by_index(self, records: Dict[str, List], key: str) -> List[ServiceInfo]:
         """Return all ServiceInfo matching the index."""
-        return [self._services[name] for name in records.get(key, [])]
+        record_list = records.get(key)
+        if record_list is None:
+            return []
+        return [self._services[name] for name in record_list]
 
     def _add(self, info: ServiceInfo) -> None:
         """Add a new service under the lock."""