quickfix-users

[Quickfix-users] Fwd: exception thrown in python with twisted logging

[Robert P. <rob...@gm...>]

Hi folks,

I'm using the python binding from quickfix 1.12.4, and seeing a
possible bug in the python interface to the Application class. The
platform is CentOS 4.4 (equiv to RHEL 4, update 4).

(1)

Basically in C++, defining the method

FIX::MyApplication::onCreate(const FIX::SessionID& sessionID )
{
    cout << sessionID.toString() << endl;
}

works, and prints the session ID as a string when the session is
instantiated, but under python, the code:

class MyApplication(quickfix.Application):

    def onCreate(self, sessionID):  print "Session ID = " + sessionID

throws an exception when called: "terminate called after throwing an
instance of 'Swig::DirectorMethodException' ".  However, calling
sessionID.toString() here instead works.

(2)
In addition, in a very simple application, I'm getting more of these
Swig::DirectorMethodException'  errors, and can't seem to determine
the origin.

Below I've included a simple, sample program and the gdb backtrace
from when the program puked. The error occurs in the Initiator.block()
method.

Any ideas on the cause of these errors?

thanks,
rob

-------------------------------------------------------------------

import quickfix
import time, sys
from twisted.python import log


class QuickFIXQuoteClient(quickfix.Application):

    def onCreate(self, sessionID):
        log.msg("QuickFIXQuoteClient: created. SessionID = "
+sessionID.toString())

    def onLogon(self, sessionID): return
    def onLogout(self, sessionID): return
    def toAdmin(self, message, sessionID):
        log.msg("QuickFIXQuoteClient:toAdmin." )
        log.msg("    session ID = " +  sessionID.toString() )
        log.msg("    message = \n"+message.toXML())

    def toApp(self, message, sessionID):  return
    def fromAdmin(self, message, sessionID): return
    def fromApp(self, message, sessionID): return


fileName = "config.conf"

settings     = quickfix.SessionSettings(fileName)
application  = QuickFIXQuoteClient()
storeFactory = quickfix.FileStoreFactory(settings)
logFactory   = quickfix.FileLogFactory(settings)
initiator = quickfix.SocketInitiator(application,
storeFactory,settings, logFactory)

initiator.start()
while 1 == 1 :
    time.sleep(1)
    print "waiting..."
initiator.stop()

------------------------------------------------------

The following is a session from gdb and python2.3
------------------------------------------------------------------
user@host src> gdb python2.3
GNU gdb Red Hat Linux (6.3.0.0-1.132.EL4rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...(no debugging
symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) set args -u  FIXQuoteClientStub.py
(gdb) r
Starting program: /usr/bin/python2.3 -u  FIXQuoteClientStub.py
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1208301888 (LWP 19118)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
2006/09/25 15:30 -0400 [-] Log opened.
2006/09/25 15:30 -0400 [-] QuickFIXQuoteClient: created. SessionID =
FIX.4.4:BLAH_TEST->BLAH
[New Thread -1215657040 (LWP 19124)]
2006/09/25 15:33 -0400 [-] QuickFIXQuoteClient:toAdmin.
2006/09/25 15:33 -0400 [-]     session ID = FIX.4.4:BLAH_TEST->BLAH
2006/09/25 15:33 -0400 [-]     message =
        <message>
          <header>
            <field number="8"><![CDATA[FIX.4.4]]></field>
            <field number="35"><![CDATA[A]]></field>
            <field number="34"><![CDATA[22]]></field>
            <field number="49"><![CDATA[BLAH]]></field>
            <field number="52"><![CDATA[20060925-19:33:52.882]]></field>
            <field number="56"><![CDATA[BLAH]]></field>
          </header>
          <body>
            <field number="98"><![CDATA[0]]></field>
            <field number="108"><![CDATA[20]]></field>
          </body>
          <trailer>
          </trailer>
        </message>
terminate called after throwing an instance of 'Swig::DirectorMethodException'

Program received signal SIGABRT, Aborted.
[Switching to Thread -1215657040 (LWP 19124)]
0x007e67a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
(gdb) bt
#0  0x007e67a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x008267a5 in raise () from /lib/tls/libc.so.6
#2  0x00828209 in abort () from /lib/tls/libc.so.6
#3  0x00b4a14b in __gnu_cxx::__verbose_terminate_handler () from
/usr/lib/libstdc++.so.6
#4  0x00b47e61 in __cxa_call_unexpected () from /usr/lib/libstdc++.so.6
#5  0x00b47e96 in std::terminate () from /usr/lib/libstdc++.so.6
#6  0x00b47eab in std::terminate () from /usr/lib/libstdc++.so.6
#7  0x00b47da3 in __cxa_call_unexpected () from /usr/lib/libstdc++.so.6
#8  0x004e603d in FIX::Initiator::block (this=Variable "this" is not available.
) at Initiator.cpp:217
#9  0x002616bf in _wrap_Initiator_block (args=0xb796f8cc) at
QuickfixPython.cpp:150095
#10 0x0099a961 in PyCFunction_Call () from /usr/lib/libpython2.3.so.1.0
#11 0x00977637 in PyObject_Call () from /usr/lib/libpython2.3.so.1.0
#12 0x009cca88 in _PyEval_SliceIndex () from /usr/lib/libpython2.3.so.1.0
#13 0x009cf196 in PyEval_EvalCodeEx () from /usr/lib/libpython2.3.so.1.0
#14 0x009cde89 in _PyEval_SliceIndex () from /usr/lib/libpython2.3.so.1.0
#15 0x009cf196 in PyEval_EvalCodeEx () from /usr/lib/libpython2.3.so.1.0
#16 0x0098ae6e in PyFunction_SetClosure () from /usr/lib/libpython2.3.so.1.0
#17 0x00977637 in PyObject_Call () from /usr/lib/libpython2.3.so.1.0
#18 0x009c92a0 in PyEval_CallObjectWithKeywords () from
/usr/lib/libpython2.3.so.1.0
#19 0x009f1172 in _PyObject_GC_Del () from /usr/lib/libpython2.3.so.1.0
#20 0x00a67371 in start_thread () from /lib/tls/libpthread.so.0
#21 0x008c6ffe in clone () from /lib/tls/libc.so.6
(gdb)

Re: [Quickfix-users] Fwd: exception thrown in python with twisted logging

[Oren M. <or...@qu...>]

This is apparently the default behavior of Swig when it receives a  
python exception from a callback.  It doesn't know what to do so it  
simply throws an DirectorMethodException and quits.  It is telling  
you that something went wrong, but does not provide any sort of  
reasonable feedback to help you figure out what it is.  The callback  
methods which handle exceptions already deal with this, however we  
did not think to handle the case where a callback method might throw  
an exception even when we were not expecting one.  I've checked in a  
fix for this.  Now when this happens, the actual python message will  
be printed out for you just as it would in a normal python  
application.  Running your example code in onCreate, I now get this:

Traceback (most recent call last):
   File "../examples/executor/python/executor.py", line 11, in onCreate
     print "SessionID = " + sessionID
TypeError: cannot concatenate 'str' and 'SessionID' objects

I'm guessing your other director exceptions are caused by similar  
python exceptions being thrown from the callbacks.  If you get the  
latest from svn, you will be able to see the real exceptions that are  
causing the application to break.

Also, is there a method in python that needs to be implemented on the  
SessionID object to make what you are doing legal?  Something that  
will automatically convert an object to a string during  
concatenation?  If so, we can implement it for all our serializable  
objects. Doing just print sessionID seems legal, so the print method  
seems to be converting to a string automatically.

--oren

On Sep 25, 2006, at 3:08 PM, Robert Parrott wrote:

> I'm using the python binding from quickfix 1.12.4, and seeing a
> possible bug in the python interface to the Application class. The
> platform is CentOS 4.4 (equiv to RHEL 4, update 4).
>
> class MyApplication(quickfix.Application):
>
>     def onCreate(self, sessionID):  print "Session ID = " + sessionID
>
> throws an exception when called: "terminate called after throwing an
> instance of 'Swig::DirectorMethodException' ".  However, calling
> sessionID.toString() here instead works.