_msgs = None
class MyIter(bt2._UserMessageIterator):
- def __init__(self, self_output_port):
+ def __init__(self, config, self_output_port):
nonlocal _msgs
self._at = 0
self._add_input_port('in')
def _user_graph_is_configured(self):
- self._msg_iter = self._create_input_port_message_iterator(
- self._input_ports['in']
- )
+ self._msg_iter = self._create_message_iterator(self._input_ports['in'])
def _user_consume(self):
assert self._msg_list[0] is None
assert msg is not None
self._msg_list[0] = None
return msg
+
+
+# Create a const field of the given field class.
+#
+# The field is part of a dummy stream, itself part of a dummy trace created
+# from trace class `tc`.
+def create_const_field(tc, field_class, field_value_setter_fn):
+ field_name = 'const field'
+
+ class MyIter(bt2._UserMessageIterator):
+ def __init__(self, config, self_port_output):
+ nonlocal field_class
+ nonlocal field_value_setter_fn
+ trace = tc()
+ packet_context_fc = tc.create_structure_field_class()
+ packet_context_fc.append_member(field_name, field_class)
+ sc = tc.create_stream_class(
+ packet_context_field_class=packet_context_fc, supports_packets=True
+ )
+ stream = trace.create_stream(sc)
+ packet = stream.create_packet()
+
+ field_value_setter_fn(packet.context_field[field_name])
+
+ self._msgs = [
+ self._create_stream_beginning_message(stream),
+ self._create_packet_beginning_message(packet),
+ ]
+
+ def __next__(self):
+ if len(self._msgs) == 0:
+ raise StopIteration
+
+ return self._msgs.pop(0)
+
+ class MySrc(bt2._UserSourceComponent, message_iterator_class=MyIter):
+ def __init__(self, config, params, obj):
+ self._add_output_port('out', params)
+
+ graph = bt2.Graph()
+ src_comp = graph.add_component(MySrc, 'my_source', None)
+ msg_iter = TestOutputPortMessageIterator(graph, src_comp.output_ports['out'])
+
+ # Ignore first message, stream beginning
+ _ = next(msg_iter)
+ packet_beg_msg = next(msg_iter)
+
+ return packet_beg_msg.packet.context_field[field_name]