sfa/methods/list.py

   1 ### $Id$
   2 ### $URL$
   3
   4 from sfa.util.faults import *
   5 from sfa.util.method import Method
   6 from sfa.util.parameter import Parameter, Mixed
   7 from sfa.trust.auth import Auth
   8 from sfa.util.record import GeniRecord
   9 from sfa.util.genitable import GeniTable
  10 from sfa.server.registry import Registries
  11 from sfa.util.prefixTree import prefixTree
  12 from sfa.trust.credential import Credential
  13
  14 class list(Method):
  15     """
  16     List the records in an authority.
  17
  18     @param cred credential string specifying the rights of the caller
  19     @param hrn human readable name of authority to list
  20     @return list of record dictionaries
  21     """
  22     interfaces = ['registry']
  23
  24     accepts = [
  25         Parameter(str, "Credential string"),
  26         Parameter(str, "Human readable name (hrn)"),
  27         Mixed(Parameter(str, "Request hash"),
  28               Parameter(None, "Request hash not specified"))
  29         ]
  30
  31     returns = [GeniRecord]
  32
  33     def call(self, cred, hrn, request_hash=None, caller_cred=None):
  34         self.api.auth.authenticateCred(cred, [cred, hrn], request_hash)
  35         self.api.auth.check(cred, 'list')
  36         if caller_cred==None:
  37             caller_cred=cred
  38
  39         #log the call
  40         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(), hrn, self.name))
  41         records = []
  42
  43         # load all know registry names into a prefix tree and attempt to find
  44         # the longest matching prefix
  45         registries = Registries(self.api)
  46         hrns = registries.keys()
  47         tree = prefixTree()
  48         tree.load(hrns)
  49         registry_hrn = tree.best_match(hrn)
  50
  51         #if there was no match then this record belongs to an unknow registry
  52         if not registry_hrn:
  53             raise MissingAuthority(hrn)
  54
  55         # if the best match (longest matching hrn) is not the local registry,
  56         # forward the request
  57         if registry_hrn != self.api.hrn:
  58             credential = self.api.getCredential()
  59             try:
  60                 record_list = registries[registry_hrn].list(credential, hrn, caller_cred=caller_cred)
  61                 records = [record.as_dict() for record in record_list]
  62                 if records:
  63                     return records
  64             except:
  65                 pass
  66
  67         # if we still havnt found the record yet, try the local registry
  68         if not self.api.auth.hierarchy.auth_exists(hrn):
  69             raise MissingAuthority(hrn)
  70
  71         table = GeniTable()
  72         records = table.find({'authority': hrn})
  73
  74         return records