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From Mark Hedges <hed...@formdata.biz>
Subject perl -c fails with FilterSnoop example in docs
Date Tue, 22 Feb 2011 20:32:18 GMT

I copied this useful debugging filter at
http://perl.apache.org/docs/2.0/user/handlers/filters.html#All_in_One_Filter

It works fine, but I can't `perl -c` :

hedges@vm5:~/foo$ perl -c Lame.pm
Invalid CODE attribute: FilterConnectionHandler at Lame.pm line 26
BEGIN failed--compilation aborted at Lame.pm line 26.

If I comment those subs out it checks fine, so
Apache2::Filter is loading. It doesn't help if I also do
"use Apache2::Filter ()" first.  Any ideas how to make this
check okay for my build test to include it?  --mark--

#file:MyApache2/FilterSnoop.pm
#----------------------------
package Lame;

=head1 SEE ALSO

Search for L<MyApache2::FilterSnoop> in the mod_perl2 pages at
http://perl.apache.org/.

=head1 METHODS

=cut

use strict;
use warnings;

use base qw(Apache2::Filter);
use Apache2::FilterRec ();
use APR::Brigade ();
use APR::Bucket ();
use APR::BucketType ();

use Apache2::Const -compile => qw(OK DECLINED);
use APR::Const     -compile => ':common';

sub connection : FilterConnectionHandler { snoop("connection", @_) }
sub request    : FilterRequestHandler    { snoop("request",    @_) }

=head2 snoop

snoop the buckets

=cut

sub snoop {
    my $type = shift;
    my ($f, $bb, $mode, $block, $readbytes) = @_; # filter args

    # $mode, $block, $readbytes are passed only for input filters
    my $stream = defined $mode ? "input" : "output";

    # read the data and pass-through the bucket brigades unchanged
    if (defined $mode) {
        # input filter
        my $rv = $f->next->get_brigade($bb, $mode, $block, $readbytes);
        return $rv unless $rv == APR::Const::SUCCESS;
        bb_dump($type, $stream, $bb);
    }
    else {
        # output filter
        bb_dump($type, $stream, $bb);
        my $rv = $f->next->pass_brigade($bb);
        return $rv unless $rv == APR::Const::SUCCESS;
    }

    return Apache2::Const::OK;
}

=head2 bb_dump

dump the buckets

=cut

sub bb_dump {
    my ($type, $stream, $bb) = @_;

    my @data;
    for (my $b = $bb->first; $b; $b = $bb->next($b)) {
        $b->read(my $bdata);
        push @data, $b->type->name, $bdata;
    }

    # send the sniffed info to STDERR so not to interfere with normal
    # output
    my $direction = $stream eq 'output' ? ">>>" : "<<<";
    print STDERR "\n$direction $type $stream filter\n";

    my $c = 1;
    while (my ($btype, $data) = splice @data, 0, 2) {
        print STDERR "    o bucket $c: $btype\n";
        print STDERR "[$data]\n";
        $c++;
    }
}
1;



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