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# This program is copyright 2013 Percona Ireland Ltd.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA.
# ###########################################################################
# ResultIterator package
# ###########################################################################
{
package ResultIterator;
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant PTDEBUG => $ENV{PTDEBUG} || 0;
use Data::Dumper;
use Lmo;
has 'dir' => (
is => 'ro',
isa => 'Str',
required => 1,
);
has 'progress' => (
is => 'ro',
isa => 'Maybe[Str]',
required => 0,
default => sub { return },
);
has '_progress' => (
is => 'rw',
isa => 'Maybe[Object]',
required => 0,
default => sub { return },
);
has '_query_fh' => (
is => 'rw',
isa => 'Maybe[FileHandle]',
required => 0,
);
has '_results_fh' => (
is => 'rw',
isa => 'Maybe[FileHandle]',
required => 0,
);
has '_rows_fh' => (
is => 'rw',
isa => 'Maybe[FileHandle]',
required => 0,
);
sub BUILDARGS {
my $class = shift;
my $args = $class->SUPER::BUILDARGS(@_);
my $dir = $args->{dir};
die "$dir does not exist\n" unless -d $dir;
my $query_file = "$dir/query";
PTDEBUG && _d('Query file:', $query_file);
open my $_query_fh, '<', $query_file
or die "Cannot open $query_file for writing: $OS_ERROR";
my $results_file = "$dir/results";
PTDEBUG && _d('Meta file:', $results_file);
open my $_results_fh, '<', $results_file
or die "Cannot open $results_file for writing: $OS_ERROR";
my $rows_file = "$dir/rows";
PTDEBUG && _d('Results file:', $rows_file);
open my $_rows_fh, '<', $rows_file
or die "Cannot open $rows_file for writing: $OS_ERROR";
my $_progress;
if ( my $spec = $args->{progress} ) {
$_progress = new Progress(
jobsize => -s $query_file,
spec => $spec,
name => $query_file,
);
}
my $self = {
%$args,
_query_fh => $_query_fh,
_results_fh => $_results_fh,
_rows_fh => $_rows_fh,
_progress => $_progress,
};
return $self;
}
sub next {
my ($self, %args) = @_;
local $INPUT_RECORD_SEPARATOR = "\n##\n";
my $_query_fh = $self->_query_fh;
my $_results_fh = $self->_results_fh;
my $_rows_fh = $self->_rows_fh;
my $query = <$_query_fh>;
my $results = <$_results_fh>;
my $rows = <$_rows_fh>;
if ( !$query ) {
PTDEBUG && _d('No more results');
return;
}
chomp($query);
if ( $results ) {
chomp($results);
eval $results;
}
if ( $rows ) {
chomp($rows);
eval $rows;
}
$query =~ s/^use ([^;]+);\n//;
my $db = $1;
if ( $db ) {
$db =~ s/^`//;
$db =~ s/`$//;
$results->{db} = $db;
}
$results->{query} = $query;
$results->{rows} = $rows;
if ( my $pr = $self->_progress ) {
$pr->update(sub { tell $_query_fh });
}
PTDEBUG && _d('Results:', Dumper($results));
return $results;
}
sub _d {
my ($package, undef, $line) = caller 0;
@_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
map { defined $_ ? $_ : 'undef' }
@_;
print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}
no Lmo;
1;
}
# ###########################################################################
# End ResultIterator package
# ###########################################################################
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