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log4perl dbi appender argument formatting

by quixadhal (Novice)
on Apr 08, 2014 at 14:20 UTC ( #1081511=perlquestion: print w/ replies, xml ) Need Help??
quixadhal has asked for the wisdom of the Perl Monks concerning the following question:

I've recently revisited an old project that uses Log::Log4perl, and decided it would be good to have it log to both a file and an SQL database. In future, it will also want to send output to sockets, but that's another story. So, I happily poked around the internet and found out how to use the DBI Appender, and all was working fine until I made an actual complex logging statement. Then, I ran into the dread Log4perl: DBI appender error: 'called with 6 bind variables when 5 are needed' Of course! As suggested, I had set the layout to NoopLayout and used bound parameters... which works just fine when using a single fixed string as your logged data, but of course most of my real logging is done using the logger as if it were sprintf.
$log->info("Data directory: %s", $options->{'dir'});
My naive through was to pass a coderef in as the warp_message parameter, hoping I could just have it do the sprintf conversion to flatten things into a single argument that would become the last bound parameter passed...
my $spr = sub { my $fmt = shift; return sprintf $fmt, @_; };
and then...
my $conf = qq! log4perl.rootLogger = TRACE, DBAppndr log4perl.appender.DBAppndr = Log::Log4perl::Appender::DBI log4perl.appender.DBAppndr.datasource = $dsn log4perl.appender.DBAppndr.username = $db_user log4perl.appender.DBAppndr.password = $db_passwd log4perl.appender.DBAppndr.sql = INSERT INTO log (level, ti +mestamp, method, line, message) VALUES (?,?,?,?,?) log4perl.appender.DBAppndr.params.1 = %p log4perl.appender.DBAppndr.params.2 = %d{yyyy-MM-dd HH:mm:ss.SSS +} log4perl.appender.DBAppndr.params.3 = %M log4perl.appender.DBAppndr.params.4 = %L log4perl.appender.DBAppndr.usePreparedStmt = 1 log4perl.appender.DBAppndr.layout = Log::Log4perl::Layou +t::NoopLayout log4perl.appender.DBAppndr.warp_message = $spr !; Log::Log4perl::init( \$conf );
This resulted in the unfortunate Can't use string ("Can't use string ("Data director"...) as a HASH ref while "strict refs" in use at /usr/local/share/perl/5.14.2/Log/Log4perl/Appender.pm line 281. I also have loggers to the screen and file, but the DBI one is the problem child, and while he's having a tantrum, the others don't even get to run. Obviously, things would work fine if I used sprintf myself at the caller level, but that defeats the purpose of having a nice clean logging statement. Any suggestions?

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