### $Id$
### $URL$

from sfa.util.faults import *
from sfa.util.misc import *
from sfa.util.method import Method
from sfa.util.parameter import Parameter, Mixed
from sfa.trust.auth import Auth
from sfa.plc.slices import Slices
from sfa.trust.credential import Credential

class get_slices(Method):
    """
    Get a list of instantiated slices at this authority.      

    @param cred credential string specifying the rights of the caller
    @return list of human readable slice names (hrn).  
    """

    interfaces = ['aggregate', 'slicemgr']
    
    accepts = [
        Parameter(str, "Credential string"),
        Mixed(Parameter(str, "Request hash"),
              Parameter(None, "Request hash not specified")),
	Parameter(str, "Callers credential string")
        ]

    returns = [Parameter(str, "Human readable slice name (hrn)")]
    
    def call(self, cred, request_hash=None, caller_cred=None):
	import pdb
	pdb.set_trace()
        self.api.auth.authenticateCred(cred, [cred], request_hash) 
        self.api.auth.check(cred, 'listslices')
	if caller_cred==None:
	   caller_cred=cred
	
	#log the call
	self.api.logger.info("interface: %s\tcaller-hrn: %s\ttarget-hrn: %s\tmethod-name: %s"%(self.api.interface, Credential(string=caller_cred).get_gid_caller().get_hrn(), None, self.name))
        slices = Slices(self.api)
        slices.refresh()
        return slices['hrn']