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Debugging

Given an exception during a node run:

$ marv run --node bagmeta b563ng6y6d3 --force
2018-02-01 09:58:10,552 INFO rospy.topics topicmanager initialized
2018-02-01 09:58:10,984 INFO marv.run b563ng6y6d.bagmeta.dwz4xbykdt.default (bagmeta) started with force
2018-02-01 09:58:10,987 ERRO marv.cli Exception occurred for dataset b563ng6y6d3pjf6ycx7t52pqae:
Traceback (most recent call last):
  File "/webapp/marv/suite/marv/marv/cli.py", line 405, in marvcli_run
    excluded_nodes, cachesize=cachesize)
  File "/webapp/marv/suite/marv/marv/site.py", line 351, in run
    deps=deps, cachesize=cachesize)
  File "/webapp/marv/suite/marv/marv_node/run.py", line 63, in run_nodes
    done, send_queue_empty = process_task(current, task)
  File "/webapp/marv/suite/marv/marv_node/run.py", line 352, in process_task
    return loop()
  File "/webapp/marv/suite/marv/marv_node/run.py", line 242, in loop
    promise = current.send(send)
  File "/webapp/marv/suite/marv/marv_node/driver.py", line 89, in _run
    request = gen.send(send)
  File "/webapp/marv/suite/marv/marv_node/node.py", line 243, in invoke
    send = yield gen.send(send)
  File "/webapp/marv/suite/robotics/marv_robotics/bag.py", line 171, in bagmeta
    xx
NameError: global name 'xx' is not defined
2018-02-01 09:58:10,992 ERRO marv.cli Error occurred for dataset b563ng6y6d3pjf6ycx7t52pqae: global name 'xx' is not defined

one can enter pdbpp by running PDB=1 marv instead of marv:

$ PDB=1 marv run --node bagmeta b563ng6y6d3 --force
2018-02-01 13:04:41,524 INFO rospy.topics topicmanager initialized
2018-02-01 13:04:41,979 INFO marv.run b563ng6y6d.bagmeta.dwz4xbykdt.default (bagmeta) started with force
NameError("global name 'xx' is not defined",)
/webapp/venv/lib/python2.7/site-packages/IPython/core/debugger.py:243: DeprecationWarning: The `color_scheme` argument is deprecated since version 5.1
  DeprecationWarning)
> /webapp/marv/suite/robotics/marv_robotics/bag.py(171)bagmeta()
    170     end_time = 0
--> 171     xx
    172     connections = {}

(Pdb++)

Likewise pdb can be used by placing import pdb; pdb.set_trace() anywhere in the code.

$ marv run --node bagmeta b563ng6y6d3 --force
2018-02-01 13:08:14,235 INFO rospy.topics topicmanager initialized
2018-02-01 13:08:14,633 INFO marv.run b563ng6y6d.bagmeta.dwz4xbykdt.default (bagmeta) started with force
/webapp/venv/lib/python2.7/site-packages/IPython/core/debugger.py:243: DeprecationWarning: The `color_scheme` argument is deprecated since version 5.1
  DeprecationWarning)
> /webapp/marv/suite/robotics/marv_robotics/bag.py(172)bagmeta()
    171     import pdb; pdb.set_trace()
--> 172     connections = {}
    173     for path in paths:

(Pdb++)

For more information see https://github.com/antocuni/pdb