constructor_interceptor func strips required kwargs

[djanderson]

Python 2.7.6 (default, Mar 22 2014, 22:59:38) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from gnuradio import gr,uhd
linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.007.001-20-unstable

>>> amsg_src = uhd.amsg_source(device_addr="", msgq=gr.msg_queue())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py", line 122, in constructor_interceptor
    return old_constructor(*args)
  File "/usr/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py", line 2721, in make
    return _uhd_swig.amsg_source_make(*args, **kwargs)
TypeError: Required argument 'msgq' (pos 2) not found

uhd.amsg_source returns the constructor_interceptor function:

def constructor_interceptor(*args, **kwargs):
    args = list(args)
    kwargs = dict(kwargs)
    for (index, key, cast) in (
           (0, 'device_addr', device_addr), 
           (1, 'io_type', io_type)):
        try:
            if len(args) > index: args[index] = cast(args[index])
            if kwargs.has_key(key): kwargs[key] = cast(kwargs[key])
        except:
            pass

                # dont pass kwargs, it confuses swig, map into args list:

    for key in ('device_addr', 'stream_args', 'io_type', 'num_channels'):
        if kwargs.has_key(key): args.append(kwargs[key])
    return old_constructor(*args)

The hard coded list of kwargs is not passing the required "msgq".

It will go through by only using args, as in: amsg_src = uhd.amsg_source("", gr.msg_queue()), however the UHD: USRP Async Msg Source block for GRC tries to pass msgq via kwarg, so it is unusable without editing the source.

[bhilburn]

Hi @Daguu - thanks for the bug-report! We don't track GR-UHD bugs here, though, they are tracked on GNURadio's bug tracker. Can you re-file there, please? http:https://gnuradio.org/redmine/projects/gnuradio/issues