from myslice.config import Config
-debug=True
+from django.contrib import messages
+from manifoldresult import ManifoldResult, ManifoldCode, ManifoldException
+from manifold.core.result_value import ResultValue
-class SessionExpired (Exception):
- def __init__ (self,message):
- self.message=message
- def __repr__ (self):
- return "<SessionExpired: %s>"%self.message
+debug=False
+debug=True
class ManifoldAPI:
self.url = config.manifold_url
self.server = xmlrpclib.Server(self.url, verbose=False, allow_none=True)
+ def __repr__ (self): return "ManifoldAPI[%s]"%self.url
+
+ # a one-liner to give a hint of what the return value looks like
+ def _print_result (self, result):
+ if not result: print "[no/empty result]"
+ elif isinstance (result,str): print "result is '%s'"%result
+ elif isinstance (result,list): print "result is a %d-elts list"%len(result)
+ else: print "[dont know how to display result]"
+
+ # xxx temporary code for scaffolding a ManifolResult on top of an API that does not expose error info
+ # as of march 2013 we work with an API that essentially either returns the value, or raises
+ # an xmlrpclib.Fault exception with always the same 8002 code
+ # since most of the time we're getting this kind of issues for expired sessions
+ # (looks like sessions are rather short-lived), for now the choice is to map these errors on
+ # a SESSION_EXPIRED code
def __getattr__(self, methodName):
def func(*args, **kwds):
try:
+ if debug: print "====> ManifoldAPI.%s"%methodName,"auth",self.auth,"args",args,"kwds",kwds
result=getattr(self.server, methodName)(self.auth, *args, **kwds)
if debug:
- print '===> backend call',methodName, self.auth, self.url,'->',
- if not result: print "no/empty result"
- elif isinstance (result,str): print "result is '%s'"%result
- elif isinstance (result,list): print "result is a %d-elts list"%len(result)
- else: print "dont know how to display result"
- return result
- except xmlrpclib.Fault, error:
- ### xxx this is very rough for now
- # until we have some agreement about how the API calls should return error conditions
- # in some less unpolite way than this anoanymous exception, we assume it's a problem with the session
- # that needs to be refreshed
- if error.faultCode == 8002:
- reason="most likely your session has expired"
- reason += " (the manifold API has no unambiguous error reporting mechanism yet)"
- raise SessionExpired(reason)
+ print '<==== backend call %s(*%s,**%s) returned'%(methodName,args,kwds),
+ print '.ctd. Authmethod=',self.auth['AuthMethod'], self.url,'->',
+ self._print_result(result)
+
+ return ResultValue(**result)
+
except Exception,error:
- print "ManifoldAPI: unexpected exception",error
- raise
+ # XXX Connection refused for example
+ print "** API ERROR **"
+ import traceback
+ traceback.print_exc()
+ if debug: print "KO (unexpected exception)",error
+ raise ManifoldException ( ManifoldResult (code=ManifoldCode.UNKNOWN_ERROR, output="%s"%error) )
+
return func
- def send_manifold_query (self, manifold_query):
- (action,subject)= (manifold_query.action,manifold_query.subject)
- if action=='get':
- # use self.Get rather than self.server.Get so we catch exceptions as per __getattr__
- return self.Get(self.auth, subject, manifold_query.filters, {}, manifold_query.fields)
- # xxx...
- else:
- print "WARNING: ManifoldAPI.send_manifold_query: only 'get' implemented for now"