[Catalyst] Trapping added errors with the correct caller

[Kieren Diment]

I've had a lot of luck with Log::Contextual recently.  It's nice for easily getting logging into model classes.

On 16/10/2012, at 1:21 AM, Alexander Hartmaier wrote:

> I recommend to use a logging module like Log::Log4perl::Catalyst and do
> all your app logging there.
> 
> My log package for NAC::Web:NAC looks like this:
> 
> package NAC::Web::NAC::Log;
> use Moose;
> use Catalyst::Log;
> use namespace::autoclean;
> 
> BEGIN { extends 'Log::Log4perl::Catalyst'; }
> 
> =head1 NAME
> 
> NAC::Web::NAC::Log - Logger for NAC::Web::NAC
> 
> =cut
> 
> # import _dump method from Catalyst::Log
> *_dump = \&Catalyst::Log::_dump;
> 
> 1;
> 
> My app uses it with:
> 
> =item finalize_config
> 
> Initializes the logger after the config file merging and loading is done.
> 
> =cut
> 
> sub finalize_config {
>    my $class = shift;
>    $class->next::method(@_);
>    $class->log(NAC::Web::NAC::Log->new($class->config->{log}));
> }
> 
> # Start the application
> __PACKAGE__->setup();
> 
> around 'prepare' => sub {
>    my $orig = shift;
>    my $self = shift;
> 
>    Log::Log4perl::MDC->remove();
> 
>    my $c = $self->$orig(@_);
> 
>    Log::Log4perl::MDC->put( "username", $c->user->username )
>        if $c->user_exists;
> 
>    return $c;
> };
> 
> And this is how the app's prod config file looks like:
> 
> <log>
>    log4perl.logger                                     "WARN, FILE, MAIL"
>    log4perl.appender.FILE
> "Log::Log4perl::Appender::File"
>    log4perl.appender.FILE.filename
> "/home/nac/log/nac-web-nac.log"
>    log4perl.appender.FILE.utf8                         1
>    log4perl.appender.FILE.syswrite                     1
>    log4perl.appender.FILE.layout
> "Log::Log4perl::Layout::PatternLayout"
>    log4perl.appender.FILE.layout.ConversionPattern     "%d{yyyy-MM-dd
> HH:mm:ss} %-5p %X{username} %m%n"
>    log4perl.appender.MAIL
> "Log::Dispatch::Email::MailSend"
>    log4perl.appender.MAIL.Threshold                    ERROR
>    log4perl.appender.MAIL.from                         "nac at domain.com"
>    log4perl.appender.MAIL.to
> "app-errors at domain.com"
>    log4perl.appender.MAIL.subject                      "[NAC::Web::NAC]
> errors"
>    log4perl.appender.MAIL.buffered                     0
>    log4perl.appender.MAIL.layout                       "PatternLayout"
>    log4perl.appender.MAIL.layout.ConversionPattern     "%d{yyyy-MM-dd
> HH:mm:ss} %-5p %X{username} %m%n"
> </log>
> 
> Best regards, Alex (abraxxa)
> 
> On 2012-10-11 14:38, Robert Rothenberg wrote:
>> I would like to trap every error added to $c->error() and log it, noting the
>> caller (filename, line number) in the logs.
>> 
>> I've not gotten Catalyst::Plugin::ErrorCatcher to work, so I wrote my own
>> plugin that overrides $c->error with the following method:
>> 
>>  use MRO::Compat;
>>  use namespace::autoclean;
>> 
>>  sub error {
>>    my ($c, @args) = @_;
>> 
>>    foreach my $arg (@args) {
>>        if ($arg) {
>> 
>>            $c->log->error($arg);
>>        }
>>    }
>> 
>>    return $c->next::method(@args);
>> }
>> 
>> But this only logs errors as coming from my plugin.
>> 
>> Using Sub::Uplevel or fiddling with $Log::Dispatch::CallerDepth or
>> $Catalyst::Plugin::Log::Dispatch::CallerDepth doesn't seem to work.
>> 
>> I also tried writing the plugin as a Moose::Role that adds my trap before
>> error, but then it claims to be from one of the internal Moose classes in my
>> logs.
>> 
>> I can manually get the caller using caller(0) and add them to the log
>> messages, but that's a bit clumsy (and overrides log formats that don't
>> include the information).
>> 
>> So... what is the best practice for trapping errors in a way that preserves
>> caller information?
>> 
>> 
>> _______________________________________________
>> List: Catalyst at lists.scsys.co.uk
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>> Dev site: http://dev.catalyst.perl.org/
> 
> 
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