feat: speed up ServiceInterface callbacks with cython methods (#274)

src/dbus_fast/message_bus.py

@@ -933,7 +933,7 @@ class BaseMessageBus:
             if not interfaces:
                 return None
             for interface in interfaces:
-                methods = ServiceInterface._get_methods(interface)
+                methods = ServiceInterface._c_get_methods(interface)
                 for method in methods:
                     if method.disabled:
                         continue
@@ -943,7 +943,7 @@ class BaseMessageBus:
                         and msg.member == method.name
                         and msg.signature == method.in_signature
                     ):
-                        return ServiceInterface._get_handler(interface, method, self)
+                        return ServiceInterface._c_get_handler(interface, method, self)
 
         return None
 

src/dbus_fast/service.pxd

@@ -24,3 +24,9 @@ cdef class ServiceInterface:
     cdef list __signals
     cdef set __buses
     cdef dict __handlers
+
+    @staticmethod
+    cdef list _c_get_methods(ServiceInterface interface)
+
+    @staticmethod
+    cdef object _c_get_handler(ServiceInterface interface, _Method method, object bus)

src/dbus_fast/service.py

@@ -455,6 +455,13 @@ class ServiceInterface:
     def _get_methods(interface: "ServiceInterface") -> List[_Method]:
         return interface.__methods
 
+    @staticmethod
+    def _c_get_methods(interface: "ServiceInterface") -> List[_Method]:
+        # _c_get_methods is used by the C code to get the methods for an
+        # interface
+        # https://github.com/cython/cython/issues/3327
+        return interface.__methods
+
     @staticmethod
     def _get_signals(interface: "ServiceInterface") -> List[_Signal]:
         return interface.__signals
@@ -469,6 +476,14 @@ class ServiceInterface:
     ) -> Callable[[Message, Callable[[Message], None]], None]:
         return interface.__handlers[bus][method]
 
+    @staticmethod
+    def _c_get_handler(
+        interface: "ServiceInterface", method: _Method, bus: "BaseMessageBus"
+    ) -> Callable[[Message, Callable[[Message], None]], None]:
+        # _c_get_handler is used by the C code to get the handler for a method
+        # https://github.com/cython/cython/issues/3327
+        return interface.__handlers[bus][method]
+
     @staticmethod
     def _add_bus(
         interface: "ServiceInterface",