exception when calling get_default_metadata()

[gmabey]

I don't use sigmf.validate.get_default_metadata() but it seems to be broken, in case someone wanted to use it:

glenm@glenm-OptiPlex-7070:~/src/sigmf-python$ ipython3 
Python 3.10.6 (main, May 29 2023, 11:10:38) [GCC 11.3.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 7.31.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import sigmf

In [2]: sigmf.validate.get_default_metadata()
---------------------------------------------------------------------------
ValidationError                           Traceback (most recent call last)
<ipython-input-2-16c967c76391> in <module>
----> 1 sigmf.validate.get_default_metadata()

~/src/sigmf-python/sigmf/validate.py in get_default_metadata(ref_schema)
     44     default = {}
     45     validator = extend_with_default(jsonschema.Draft7Validator)
---> 46     validator(ref_schema).validate(default)
     47     return default
     48 

/usr/lib/python3/dist-packages/jsonschema/validators.py in validate(self, *args, **kwargs)
    351         def validate(self, *args, **kwargs):
    352             for error in self.iter_errors(*args, **kwargs):
--> 353                 raise error
    354 
    355         def is_type(self, instance, type):

ValidationError: 'global' is a required property

or maybe I'm missing something here?

[Teque5]

It says in the docstring for that function that it is currently broken. I believe the intent was to retrieve a vanilla metadata dictionary similar to how calling sigmf.SigMFFile() returns a basic dictionary:

SigMFFile({
    "global": {
        "core:num_channels": 1,
        "core:version": "1.1.1"
    },
    "captures": [],
    "annotations": []
})

In the validator the empty default should get filled with a more realistic default. Currently the above skeleton fails validation b/c it has no datatype defined, among other issues.

Perhaps get_default_metadata() should be removed.