[Koha-devel] Koha Day - CGI::Carp error handling

[Mason James]

Hi Koha-Devel,

There has been a little talk recently on the koha-devel list about  
error handling in Koha.

Chris and I spent some time on Friday(nz time) to work out a  
relatively small and tidy way, using CGI::Carp, to trap and redirect  
most runtime errors in Koha to the user's browser.

We have made a System-Preference called DebugLevel, that has  
currently 3 values 0, 1 and 2. (more?)

something like... ???
0 is Quiet - For production
1 is Developer - For debugging
2 is Logging - Bug reporting , and additional package version info  
too, like Apache, MySQL, Perl,YAZ, Z9350::ZOOM MARC::Record/Charset....


The CGI::Carp stuff has been added near the start of Output.pm, so  
it's set up nice and early to handle (and output) any later errors.
I committed the CGI::Carp stuff to dev_week, but if people like the  
idea, I'll commit it to rel_3 too...

Here is the commit to Output.pm below.
http://cvs.savannah.nongnu.org/viewvc/koha/C4/Output.pm? 
root=koha&r1=1.51.2.2.2.1&r2=1.51.2.2.2.2&pathrev=dev_week


Using CGI::Carp with the DebugLevel syspref at '2',  Koha now handles  
this example script's syntax error.
----------------------------------
#!/usr/bin/perl
use C4::Output;

ndjsnsjkcndjkscndjskcndjks
exit;
------------------------------------


And sends Perl's error message back to he user's browser for either  
debugging further, or perhaps attaching to a bug report, or to the  
bottom of a koha-devel list email.

Like this below....
----------------------------------
debug level 2

Got an error: syntax error at /koha/dev_week/intranet/cgi-bin/misc/ 
carp_test.pl line 6, near "ndjsnsjkcndjkscndjskcndjks exit"
Execution of /koha/dev_week/intranet/cgi-bin/misc/carp_test.pl  
aborted due to compilation errors.

Koha	2.2.8
Perl	5.008008
MySQL	mysql Ver 14.12 Distrib 5.0.32, for pc-linux-gnu (i486) using  
readline 5.2
OS	Linux arwen.metavore.com 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36  
UTC 2007 i686 GNU/Linux
Apache	Server version: Apache/2.2.3 Server built: Jun 17 2007 20:24:06
----------------------------------

How does this sound,
Any improvements suggestions or corrections?


Cheers, Mason

--
Mason James                                mason.james at liblime.com
Programmer                                         www.liblime.com
LibLime                                             +64 21 542 117
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