[Zope] RE: ZopeProfiler issue (found root cause)

[Pascal Peregrina]

I just finished reading xmlrpclib.py and ZopeProfiler code.

Here is the root cause of the issue :

In my code :
 getattr(ServerProxy(self.url),self.rpc_method_expr) returns an
xmlrpclib._Method object

Then ZopeProfiler calls
ZopeProfiler.ZopeProfiler.getHLFuncId(self,fn,frame), which contains:
gP= getattr(s,'getPhysicalPath',None)

So this calls xmlrpclib._Method.__getattr__, which is:
    def __getattr__(self, name):
        return _Method(self.__send, "%s.%s" % (self.__name, name))

So this returns another xmlrpclib._Method object for a "getPhysicalPath" RPC
method

Because gP is not None, ZopeProfiler then does :
p= gP()

And this makes an RPC method call on the service, and of course raises an
Exception !

So for my tests I hacked xmlrpclib._Method.__getattr__ to return None for
'getPhysicalPath' :
    def __getattr__(self, name):
        if name=='getPhysicalPath':
            return None
        return _Method(self.__send, "%s.%s" % (self.__name, name))

But a real fix will be needed on ZopeProfiler !

Thanks.

Pascal

-----Message d'origine-----
De : Pascal Peregrina 
Envoyé : lundi 27 juin 2005 10:42
À : 'zope at zope.org'
Objet : ZopeProfiler issue


Hi,

In a previous mail, I was asking if anyone had issues with ZopeProfiler and
Zope 2.8.
I have made many more tests and my issue is completely unrelated with Zope
2.8 (I got the same issue with Zope 2.7.6)

The issue has to deal with an XML-RPC call to a java service (using the
standard xmlrpclib module).

The code is (method of a class of my own):
    def query(self):
        from xmlrpclib import ServerProxy, loads, ProtocolError
        try:
            if self.protocol=='HTTP GET':
                self.result=loads(urlopen(self.url).read())[0][0]
            elif self.protocol=='XMLRPC':
 
self.result=getattr(ServerProxy(self.url),self.rpc_method_expr)(*self.params
)
        except ProtocolError:
            self.result=None
            self.zeroconf_exception=1
            self.log_exception()
        except SocketError:
            self.result=None
            self.zeroconf_exception=1
            self.log_exception()
        except IOError:
            self.result=None
            self.zeroconf_exception=1
            self.log_exception()
        except:
            self.result=None
            self.log_exception()

This works fine with disabled profiler.

However, when I enable the profiler, I get this error :
Fault: <Fault 0: 'java.lang.Exception: RPC handler object "cat.getProducts"
not found and no default handler registered\n\tat
org.apache.xmlrpc.SelfDocumentingHandlerMapping.getHandler(Ljava.lang.String
;)Ljava.lang.Object;(Unknown Source)\n\tat
org.apache.xmlrpc.XmlRpcWorker.execute(Ljava.io.InputStream;Lorg.apache.xmlr
pc.XmlRpcContext;)[B(XmlRpcWorker.java:183)\n\tat
org.apache.xmlrpc.DocXmlRpcServer.execute(Ljava.io.InputStream;Lorg.apache.x
mlrpc.XmlRpcContext;)[B(Unknown Source)\n\tat
org.apache.xmlrpc.DocXmlRpcServer.execute(Ljava.io.InputStream;Ljava.lang.St
ring;Ljava.lang.String;)[B(Unknown Source)\n\tat
org.apache.xmlrpc.DocXmlRpcWebServer$Connection.run()V(Unknown Source)\n\tat
org.apache.xmlrpc.DocXmlRpcWebServer$Runner.run()V(Unknown Source)\n\tat
java.lang.Thread.run()V(Optimized Method)\n\tat
java.lang.Thread.startThreadFromVM(Ljava.lang.Thread;)V(Optimized
Method)\n'> 

I can reproduce that error if I omit (*self.params) on that line :
 
self.result=getattr(ServerProxy(self.url),self.rpc_method_expr)(*self.params
)

But when I add some logging, self.params looks fine.
Changing that line into :
 
self.result=apply(getattr(ServerProxy(self.url),self.rpc_method_expr),self.p
arams)
Gives the same error.

I also tried hardcoding the arguments, and I still get the same issue !

I don't know what to do, I really need to profile my Zope instance.
So any suggestion would be highly appreciated...

Thanks.

Pascal


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