[Zope-Coders] Re: [Zope.Com Geeks] No Zope tracebacks

[Barry A. Warsaw]

>>>>> "GvR" == Guido van Rossum <guido@python.org> writes:

    GvR> I am trying the ZMI with some new code on the Zope 2 trunk,
    GvR> and I need tracebacks.  When I get an error, the message

    GvR>   For more detailed information about the error, please refer
    GvR> to the HTML source for this page.

    GvR> is displayed, but there is no traceback in the HTML source.
    GvR> (I've looked in all frames!)

    GvR> I showed this to Jim last week and he was very surprised.
    GvR> Did something break?  Can anyone help me with this?  I have
    GvR> no idea where to start looking.

Guido, I recently hit the exact same problem with the Zope2 trunk.

I've no clue why tracebacks aren't happening now, and I distinctly
remember that they were at one point.  I did a bunch of googling and
zope.org searching and didn't come up with much.  Then I searched my
mail folders. :)

I found an internal message from Chris McDonough dated Aug 2001 which
gave me a clue, although it required hacking the Zope source.  I
modified his suggestion a bit and came up with the following, which
doesn't actually give me the traceback in an html comment, but does
give me a traceback on stdout (as Chris's suggestion did).  That was
good enough for my purposes, so I stopped there.

Below is the patch I threw together.  I'd be interested in a more
principled way of doing this.

-Barry

Index: lib/python/Zope/__init__.py
===================================================================
RCS file: /cvs-repository/Zope/lib/python/Zope/__init__.py,v
retrieving revision 1.29
diff -u -r1.29 __init__.py
--- lib/python/Zope/__init__.py 7 Feb 2002 18:16:02 -0000       1.29
+++ lib/python/Zope/__init__.py 20 May 2002 19:24:55 -0000
@@ -102,6 +102,11 @@
     ConflictError=ZODB.POSException.ConflictError,
     ListType=type([]),
     ):
+    from zLOG.FormatException import format_exception
+    x = format_exception(t, v, traceback)
+    for line in x:
+        print line[:-1]
+
     try:
         if isinstance(t, StringType):
             if t.lower() in ('unauthorized', 'redirect'):