from sfa.util.sfalogging import logger
from sfa.util.py23 import xmlrpc_client


class FdShell:
    """
    A simple xmlrpc shell to a federica API server
    This class can receive the XMLRPC calls to the federica testbed
    For safety this is limited to a set of hard-coded calls
    """

    direct_calls = ['listAvailableResources',
                    'listSliceResources',
                    'createSlice',
                    'deleteSlice',
                    'getRSpecVersion',
                    'listSlices',
                    ]

    def __init__(self, config):
        url = config.SFA_FEDERICA_URL
        # xxx not sure if java xmlrpc has support for None
        # self.proxy = xmlrpc_client.ServerProxy(url, verbose = False, allow_none = True)
        # xxx turn on verbosity
        self.proxy = xmlrpc_client.ServerProxy(url, verbose=True)

    # xxx get credentials from the config ?
    # right now basic auth data goes into the URL
    # so do *not* add any credential at that point
    def __getattr__(self, name):
        def func(*args, **kwds):
            if name not in FdShell.direct_calls:
                raise Exception(
                    "Illegal method call %s for FEDERICA driver" % (name))
            logger.info("Issuing %s args=%s kwds=%s to federica" %
                        (name, args, kwds))
#            result=getattr(self.proxy, "AggregateManager.%s"%name)(credential, *args, **kwds)
            result = getattr(self.proxy, "AggregateManager.%s" %
                             name)(*args, **kwds)
            logger.debug('FdShell %s (%s) returned ... ' % (name, name))
            return result
        return func