manifold/manifoldapi.py

   1 # Manifold API Python interface
   2 import xmlrpclib
   3
   4 from myslice.config import Config
   5
   6 debug=True
   7
   8 class SessionExpired (Exception):
   9     def __init__ (self,message):
  10         self.message=message
  11     def __repr__ (self):
  12         return "<SessionExpired: %s>"%self.message
  13
  14 class ManifoldAPI:
  15
  16     def __init__(self, auth=None, cainfo=None):
  17
  18         config = Config()
  19         self.auth = auth
  20         self.cainfo = cainfo
  21         self.errors = []
  22         self.trace = []
  23         self.calls = {}
  24         self.multicall = False
  25         self.url = config.manifold_url
  26         self.server = xmlrpclib.Server(self.url, verbose=False, allow_none=True)
  27
  28     def __getattr__(self, methodName):
  29         def func(*args, **kwds):
  30             try:
  31                 result=getattr(self.server, methodName)(self.auth, *args, **kwds)
  32                 if debug:
  33                     print '===> backend call',methodName, self.auth, self.url,'->',
  34                     if not result:                        print "no/empty result"
  35                     elif isinstance (result,str):         print "result is '%s'"%result
  36                     elif isinstance (result,list):        print "result is a %d-elts list"%len(result)
  37                     else:                                 print "dont know how to display result"
  38                 return result
  39             except xmlrpclib.Fault, error:
  40                 ### xxx this is very rough for now
  41                 # until we have some agreement about how the API calls should return error conditions
  42                 # in some less unpolite way than this anoanymous exception, we assume it's a problem with the session
  43                 # that needs to be refreshed
  44                 if error.faultCode == 8002:
  45                     reason="most likely your session has expired"
  46                     reason += " (the manifold API has no unambiguous error reporting mechanism yet)"
  47                     raise SessionExpired(reason)
  48             except Exception,error:
  49                 print "ManifoldAPI: unexpected exception",error
  50                 raise
  51         return func
  52
  53     def send_manifold_query (self, manifold_query):
  54         (action,subject)= (manifold_query.action,manifold_query.subject)
  55         if action=='get':
  56             # use self.Get rather than self.server.Get so we catch exceptions as per __getattr__
  57             return self.Get(self.auth, subject, manifold_query.filters, {}, manifold_query.fields)
  58         # xxx...
  59         else:
  60             print "WARNING: ManifoldAPI.send_manifold_query: only 'get' implemented for now"