[omniORB] Potential bug with "empty" valuetype in OmniPy [C1]

[Stephane BONNIEZ]

Hello,

I'm experiencing problems with OmniPy which seem to boil down to the
following test case.
The problem could be reproduced with both Python 2.4 and 2.6 and with
OmniORB 4.1.2 and 4.1.3.

My IDL looks like this:

module valuetypestest {

valuetype Type1 {
// Empty
};

valuetype Type2 {
// Empty too
};

valuetype CompositeType {
public Type1 obj1;
public Type2 obj2;
};

interface TestService {
oneway void doSomething(in CompositeType param);
};

};

I have a server started, exposing TestService, and I try to call it, so I
instantiate a CompositeType. That's where I get into trouble. If either
obj1 or obj2 is left to None, everything goes all right but if they both
have a not-None value, the client crashes with the following error message:

omniORB: Assertion failed. This indicates a bug in the application
using omniORB, or maybe in omniORB itself.
file: cdrValueChunkStream.cc
line: 286
info: *endp == -(pd_nestLevel + 1)
omniORB: Unexpected C++ exception during Python invocation.

This application has requested the Runtime to terminate it in an
unusual way.
Please contact the application's support team for more information.

The client code is as follows:

import sys
from omniORB import CORBA
import valuetypestest

orb = CORBA.ORB_init(sys.argv, CORBA.ORB_ID)
poa = orb.resolve_initial_references("RootPOA")
obj = orb.string_to_object(sys.argv[1])
server = obj._narrow(valuetypestest.TestService)

testParam = valuetypestest.CompositeType()
testParam.obj1 = valuetypestest.Type1()
testParam.obj2 = valuetypestest.Type2()
server.doSomething(testParam)

With -ORBtraceLevel 25 I noticed this right before the failed assertion:
omniORB: Create Python output value indirection tracker
omniORB: Start output value header.
omniORB: Start writing chunked value body. Nest level = 1.
omniORB: Start output value header.
omniORB: Start writing chunked value body. Nest level = 2.
-> omniORB: End writing chunked value. Nest level = 2.
omniORB: Start output value header.
omniORB: Start writing chunked value body. Nest level = 2.
-> omniORB: End writing nested chunked value. Nest level = 2.

However, I'm stuck here. Can you help me out with this ?

Thanks in advance,

Stephane

PS : I attached the complete source code.

(See attached file: corbaserver.py)(See attached file: corbaclient.py)(See
attached file: valuetypetest.idl)
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[Duncan Grisby]

On Tuesday 26 May, Stephane BONNIEZ wrote:

[...]

Post by Stephane BONNIEZ
I have a server started, exposing TestService, and I try to call it, so I
instantiate a CompositeType. That's where I get into trouble. If either
obj1 or obj2 is left to None, everything goes all right but if they both
omniORB: Assertion failed. This indicates a bug in the application
using omniORB, or maybe in omniORB itself.
file: cdrValueChunkStream.cc
line: 286
info: *endp == -(pd_nestLevel + 1)
omniORB: Unexpected C++ exception during Python invocation.

It is indeed a bug. The chunked valuetype encoding did not properly
handle the case of a value with no data. I've fixed it in CVS. Note that
the fix is in omniORB, not in omniORBpy, so you need to update omniORB
to get the fix.

Cheers,

Duncan.