+ self.assertEqual(the_output_port_from_iter.user_data, "user data")
+
+ def test_create_from_message_iterator(self):
+ class MySourceIter(bt2._UserMessageIterator):
+ def __init__(self, config, self_port_output):
+ nonlocal src_iter_initialized
+ src_iter_initialized = True
+
+ class MySource(bt2._UserSourceComponent, message_iterator_class=MySourceIter):
+ def __init__(self, config, params, obj):
+ self._add_output_port("out")
+
+ class MyFilterIter(bt2._UserMessageIterator):
+ def __init__(self, config, self_port_output):
+ nonlocal flt_iter_initialized
+ flt_iter_initialized = True
+ self._up_iter = self._create_message_iterator(
+ self._component._input_ports["in"]
+ )
+
+ def __next__(self):
+ return next(self._up_iter)
+
+ class MyFilter(bt2._UserFilterComponent, message_iterator_class=MyFilterIter):
+ def __init__(self, config, params, obj):
+ self._add_input_port("in")
+ self._add_output_port("out")
+
+ src_iter_initialized = False
+ flt_iter_initialized = False
+ graph = _create_graph(MySource, SimpleSink, MyFilter)
+ graph.run()
+ self.assertTrue(src_iter_initialized)
+ self.assertTrue(flt_iter_initialized)
+
+ # Test that creating a message iterator from a sink component on a
+ # non-connected inport port raises.
+ def test_create_from_sink_component_unconnected_port_raises(self):
+ class MySink(bt2._UserSinkComponent):
+ def __init__(comp_self, config, params, obj):
+ comp_self._input_port = comp_self._add_input_port("in")
+
+ def _user_graph_is_configured(comp_self):
+ with self.assertRaisesRegex(ValueError, "input port is not connected"):
+ comp_self._create_message_iterator(comp_self._input_port)
+
+ nonlocal seen
+ seen = True
+
+ def _user_consume(self):
+ raise bt2.Stop
+
+ seen = False
+ graph = bt2.Graph()
+ graph.add_component(MySink, "snk")
+ graph.run()
+ self.assertTrue(seen)
+
+ # Test that creating a message iterator from a message iteartor on a
+ # non-connected inport port raises.
+ def test_create_from_message_iterator_unconnected_port_raises(self):
+ class MyFilterIter(bt2._UserMessageIterator):
+ def __init__(iter_self, config, port):
+ input_port = iter_self._component._input_ports["in"]
+
+ with self.assertRaisesRegex(ValueError, "input port is not connected"):
+ iter_self._create_message_iterator(input_port)
+
+ nonlocal seen
+ seen = True
+
+ class MyFilter(bt2._UserFilterComponent, message_iterator_class=MyFilterIter):
+ def __init__(comp_self, config, params, obj):
+ comp_self._add_input_port("in")
+ comp_self._add_output_port("out")
+
+ class MySink(bt2._UserSinkComponent):
+ def __init__(comp_self, config, params, obj):
+ comp_self._input_port = comp_self._add_input_port("in")
+
+ def _user_graph_is_configured(comp_self):
+ comp_self._input_iter = comp_self._create_message_iterator(
+ comp_self._input_port
+ )
+
+ def _user_consume(self):
+ raise bt2.Stop
+
+ seen = False
+ graph = bt2.Graph()
+ flt = graph.add_component(MyFilter, "flt")
+ snk = graph.add_component(MySink, "snk")
+ graph.connect_ports(flt.output_ports["out"], snk.input_ports["in"])
+ graph.run()
+ self.assertTrue(seen)
+
+ def test_create_user_error(self):
+ # This tests both error handling by
+ # _UserSinkComponent._create_message_iterator
+ # and _UserMessageIterator._create_message_iterator, as they
+ # are both used in the graph.
+ class MySourceIter(bt2._UserMessageIterator):
+ def __init__(self, config, self_port_output):
+ raise ValueError("Very bad error")
+
+ class MySource(bt2._UserSourceComponent, message_iterator_class=MySourceIter):
+ def __init__(self, config, params, obj):
+ self._add_output_port("out")
+
+ class MyFilterIter(bt2._UserMessageIterator):
+ def __init__(self, config, self_port_output):
+ # This is expected to raise because of the error in
+ # MySourceIter.__init__.
+ self._create_message_iterator(self._component._input_ports["in"])
+
+ class MyFilter(bt2._UserFilterComponent, message_iterator_class=MyFilterIter):
+ def __init__(self, config, params, obj):
+ self._add_input_port("in")
+ self._add_output_port("out")
+
+ graph = _create_graph(MySource, SimpleSink, MyFilter)
+
+ with self.assertRaises(bt2._Error) as ctx:
+ graph.run()
+
+ exc = ctx.exception
+ cause = exc[0]
+
+ self.assertIsInstance(cause, bt2._MessageIteratorErrorCause)
+ self.assertEqual(cause.component_name, "src")
+ self.assertEqual(cause.component_output_port_name, "out")
+ self.assertIn("ValueError: Very bad error", cause.message)