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         ]
  28
  29     returns = [GeniRecord]
  30
  31     def call(self, cred, hrn, caller_cred=None):
  32
  33         self.api.auth.check(cred, 'list')
  34         if caller_cred==None:
  35             caller_cred=cred
  36
  37         #log the call
  38         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))
  39         records = []
  40
  41         # load all know registry names into a prefix tree and attempt to find
  42         # the longest matching prefix
  43         registries = Registries(self.api)
  44         hrns = registries.keys()
  45         tree = prefixTree()
  46         tree.load(hrns)
  47         registry_hrn = tree.best_match(hrn)
  48
  49         #if there was no match then this record belongs to an unknow registry
  50         if not registry_hrn:
  51             raise MissingAuthority(hrn)
  52
  53         # if the best match (longest matching hrn) is not the local registry,
  54         # forward the request
  55         if registry_hrn != self.api.hrn:
  56             credential = self.api.getCredential()
  57             try:
  58                 record_list = registries[registry_hrn].list(credential, hrn, caller_cred=caller_cred)
  59                 records = [record.as_dict() for record in record_list]
  60                 if records:
  61                     return records
  62             except:
  63                 pass
  64
  65         # if we still havnt found the record yet, try the local registry
  66         if not self.api.auth.hierarchy.auth_exists(hrn):
  67             raise MissingAuthority(hrn)
  68
  69         table = GeniTable()
  70         records = table.find({'authority': hrn})
  71
  72         return records