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package DBI::Gofer::Transport::Base; # $Id: Base.pm 12536 2009-02-24 22:37:09Z Tim $ # # Copyright (c) 2007, Tim Bunce, Ireland # # You may distribute under the terms of either the GNU General Public # License or the Artistic License, as specified in the Perl README file. use strict; use warnings; use DBI; use base qw(DBI::Util::_accessor); use DBI::Gofer::Serializer::Storable; use DBI::Gofer::Serializer::DataDumper; our $VERSION = "0.012537"; __PACKAGE__->mk_accessors(qw( trace keep_meta_frozen serializer_obj )); # see also $ENV{DBI_GOFER_TRACE} in DBI::Gofer::Execute sub _init_trace { (split(/=/,$ENV{DBI_GOFER_TRACE}||0))[0] } sub new { my ($class, $args) = @_; $args->{trace} ||= $class->_init_trace; $args->{serializer_obj} ||= DBI::Gofer::Serializer::Storable->new(); my $self = bless {}, $class; $self->$_( $args->{$_} ) for keys %$args; $self->trace_msg("$class->new({ @{[ %$args ]} })\n") if $self->trace; return $self; } my $packet_header_text = "GoFER1:"; my $packet_header_regex = qr/^GoFER(\d+):/; sub _freeze_data { my ($self, $data, $serializer, $skip_trace) = @_; my $frozen = eval { $self->_dump("freezing $self->{trace} ".ref($data), $data) if !$skip_trace and $self->trace; local $data->{meta}; # don't include meta in serialization $serializer ||= $self->{serializer_obj}; my ($data, $deserializer_class) = $serializer->serialize($data); $packet_header_text . $data; }; if ($@) { chomp $@; die "Error freezing ".ref($data)." object: $@"; } # stash the frozen data into the data structure itself # to make life easy for the client caching code in DBD::Gofer::Transport::Base $data->{meta}{frozen} = $frozen if $self->keep_meta_frozen; return $frozen; } # public aliases used by subclasses *freeze_request = \&_freeze_data; *freeze_response = \&_freeze_data; sub _thaw_data { my ($self, $frozen_data, $serializer, $skip_trace) = @_; my $data; eval { # check for and extract our gofer header and the info it contains (my $frozen = $frozen_data) =~ s/$packet_header_regex//o or die "does not have gofer header\n"; my ($t_version) = $1; $serializer ||= $self->{serializer_obj}; $data = $serializer->deserialize($frozen); die ref($serializer)."->deserialize didn't return a reference" unless ref $data; $data->{_transport}{version} = $t_version; $data->{meta}{frozen} = $frozen_data if $self->keep_meta_frozen; }; if ($@) { chomp(my $err = $@); # remove extra noise from Storable $err =~ s{ at \S+?/Storable.pm \(autosplit into \S+?/Storable/thaw.al\) line \d+(, \S+ line \d+)?}{}; my $msg = sprintf "Error thawing: %s (data=%s)", $err, DBI::neat($frozen_data,50); Carp::cluck("$msg, pid $$ stack trace follows:"); # XXX if $self->trace; die $msg; } $self->_dump("thawing $self->{trace} ".ref($data), $data) if !$skip_trace and $self->trace; return $data; } # public aliases used by subclasses *thaw_request = \&_thaw_data; *thaw_response = \&_thaw_data; # this should probably live in the request and response classes # and the tace level passed in sub _dump { my ($self, $label, $data) = @_; # don't dump the binary local $data->{meta}{frozen} if $data->{meta} && $data->{meta}{frozen}; my $trace_level = $self->trace; my $summary; if ($trace_level >= 4) { require Data::Dumper; local $Data::Dumper::Indent = 1; local $Data::Dumper::Terse = 1; local $Data::Dumper::Useqq = 0; local $Data::Dumper::Sortkeys = 1; local $Data::Dumper::Quotekeys = 0; local $Data::Dumper::Deparse = 0; local $Data::Dumper::Purity = 0; $summary = Data::Dumper::Dumper($data); } elsif ($trace_level >= 2) { $summary = eval { $data->summary_as_text } || $@ || "no summary available\n"; } else { $summary = eval { $data->outline_as_text."\n" } || $@ || "no summary available\n"; } $self->trace_msg("$label: $summary"); } sub trace_msg { my ($self, $msg, $min_level) = @_; $min_level = 1 unless defined $min_level; # transport trace level can override DBI's trace level $min_level = 0 if $self->trace >= $min_level; return DBI->trace_msg("gofer ".$msg, $min_level); } 1; =head1 NAME DBI::Gofer::Transport::Base - Base class for Gofer transports =head1 DESCRIPTION This is the base class for server-side Gofer transports. It's also the base class for the client-side base class L<DBD::Gofer::Transport::Base>. This is an internal class. =head1 AUTHOR Tim Bunce, L<http://www.tim.bunce.name> =head1 LICENCE AND COPYRIGHT Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See L<perlartistic>. =cut