UserType object on wsexpose: 'UuidType' object has no attribute '__name__'

[Lucas Alvares Gomes]

Using an UserType instance with the wsexpose decorator in WSME will fail with:

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/wsmeext/pecan.py", line 73, in callfunction
    pecan.request.body, pecan.request.content_type

  File "/usr/local/lib/python2.7/dist-packages/wsme/rest/args.py", line 269, in get_args
    from_args = args_from_args(funcdef, args, kwargs)

  File "/usr/local/lib/python2.7/dist-packages/wsme/rest/args.py", line 179, in args_from_args
    "unable to convert to %s" % argdef.datatype.__name__)

AttributeError: 'UuidType' object has no attribute '__name__'

To fix it, the the args_from_args() function at wsme/rest/args.py should check whether the argument type is an object instance of UserType before trying to access it's __name___ attribute.

My new user type Implementation looks like:

class UuidType(wsme.types.UserType):
    """A simple UUID type."""

    basetype = wtypes.text
    name = 'uuid'

    @staticmethod
    def validate(value):
        if not utils.is_uuid_like(value):
            raise exception.InvalidUUID(uuid=value)
        return value

    @staticmethod
    def frombasetype(value):
        return UuidType.validate(value)

uuid_type = UuidType()

On the controller I've something like:

class FakeController(rest.RestController):

    @wsme_pecan.wsexpose(None, uuid_type)
    def get_one(self, obj_uuid):
        ....

I can use my new type as the type of the attributes of my API object class, e.g:

class Object(wsme.types.Base):

    uuid = uuid_type

But I also would like to use it on the wsexpose decorator, just like I do with native types as int, bool etc...

Versions:
pecan (0.4.2)
WSME (0.5b6)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/64715
Committed: https://git.openstack.org/cgit/stackforge/wsme/commit/?id=228bfbd084ff2c4653740696d26ed10748aaa33c
Submitter: Jenkins
Branch: master

commit 228bfbd084ff2c4653740696d26ed10748aaa33c
Author: Lucas Alvares Gomes <email address hidden>
Date: Thu Jan 2 19:25:45 2014 +0000

    args_from_args() to work with an instance of UserType

    When the args_from_args() function fails to convert a value to a certain
    type it tries to get the name of that type by using the __name__ attribute
    of that type, UserType object instances doesn't have the __name__
    attribute so the function fails when it tries to access it, this patch
    makes WSME to check if it's an UserType instance before getting it's name.

    Change-Id: If78ce0e642997421c97559cc28604421f5c03922
    Closes-Bug: #1265590