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