add_method.py

import collections

_ApiMethod = collections.namedtuple('_ApiMethod', ['name', 'path', 'http_method', 'query_params'])

API = [
    _ApiMethod('print_hello', 'api/hello', "GET", ['limit']),

]


class Meta(type):
    def __new__(mcs, *args, **kwargs):
        o = super(Meta, mcs).__new__(mcs, *args, **kwargs)

        def _add_methods():

            def _build_method(path, http_method, expected_query_params):

                if http_method == "GET":
                    def _method(self, **method_kwargs):
                        query_params = kwargs.setdefault('query_params', {})
                        query_params.update({qp: kwargs[qp] for qp in expected_query_params if qp in method_kwargs})
                        return self.get(path=path, **method_kwargs)
                else:
                    raise NotImplementedError
                return _method

            for api_method in API:
                setattr(
                    o, api_method.name, 
                    _build_method(api_method.path, api_method.http_method, api_method.query_params or []))
        _add_methods()
        return o


class HelloClient(metaclass=Meta):
    # Commented out as it is broken
    # def __repr__(self):
    #     return "HelloClient(%s)" % ', '.join('%s=%s' % (a, repr(getattr(self, a))) for a in ['url', 'headers'])

    # noinspection PyUnusedLocal,PyMethodMayBeStatic
    def get(self, path, query_params=None, headers=None, **kwargs):

        return "I am Hello Get Method"


client = HelloClient()
# noinspection PyUnresolvedReferences
response = client.print_hello()