Fix: sink.text.pretty: check that port is connected before creating message iterator
authorSimon Marchi <simon.marchi@efficios.com>
Tue, 14 Apr 2020 15:22:17 +0000 (11:22 -0400)
committerPhilippe Proulx <eeppeliteloop@gmail.com>
Wed, 15 Apr 2020 00:26:26 +0000 (20:26 -0400)
commit440ffe5943780574bfe1232e8fbe2693f4256eac
tree077e3ccc293b29727dd2d3337da2022a23d61d51
parentec3bf3f163573c9f6694ad2012d6fb62e157f74e
Fix: sink.text.pretty: check that port is connected before creating message iterator

sink.text.pretty does not check if its input port is connected before
trying to create a message iterator on it.  This can lead to a
precondition assertion failure.  It can be reproduced with this Python
snippet.

    import bt2
    g = bt2.Graph()
    g.add_component(bt2.find_plugin('text').sink_component_classes['pretty'], 'snk')
    g.run()

The assertion failure we get is:

    04-14 11:35:27.339 1231815 1231815 F LIB/MSG-ITER create_self_component_input_port_message_iterator@iterator.c:295 Babeltrace 2 library precondition not satisfied; error is:
    04-14 11:35:27.339 1231815 1231815 F LIB/MSG-ITER create_self_component_input_port_message_iterator@iterator.c:295 Input port is not connected: port-addr=0x607000001d70, port-type=INPUT, port-name="in"
    04-14 11:35:27.339 1231815 1231815 F LIB/MSG-ITER create_self_component_input_port_message_iterator@iterator.c:295 Aborting...
    ./tests/utils/../utils/utils.sh: line 283: 1231815 Aborted (core dumped) env "${env_args[@]}" "$@"

Add a check and return an error if that happens instead.  A
corresponding test is also added.

Change-Id: Ibeed94cd6ece543817fe8a765a69cb52bbaaba76
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/3403
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Tested-by: jenkins <jenkins@lttng.org>
src/plugins/text/pretty/pretty.c
tests/Makefile.am
tests/plugins/sink.text.pretty/test_pretty [new file with mode: 0755]
tests/plugins/sink.text.pretty/test_pretty.py [new file with mode: 0644]
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