mirror of
https://github.com/percona/percona-toolkit.git
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107 lines
3.6 KiB
Perl
107 lines
3.6 KiB
Perl
# This program is copyright 2010-2011 Percona Ireland Ltd.
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# Feedback and improvements are welcome.
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#
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# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation, version 2; OR the Perl Artistic License. On UNIX and similar
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# systems, you can issue `man perlgpl' or `man perlartistic' to read these
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# licenses.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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# Place, Suite 330, Boston, MA 02111-1307 USA.
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# ###########################################################################
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# FileIterator package
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# ###########################################################################
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{
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# Package: FileIterator
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# FileIterator make iterators that return filenames.
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package FileIterator;
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use strict;
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use warnings FATAL => 'all';
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use English qw(-no_match_vars);
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use constant PTDEBUG => $ENV{PTDEBUG} || 0;
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sub new {
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my ( $class, %args ) = @_;
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my $self = {
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%args,
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};
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return bless $self, $class;
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}
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# get_file_itr() returns an iterator over the filenames passed in, which are
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# typically from @ARGV on the command-line. The special filename '-' is a
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# synonym for STDIN, and an empty array is equivalent to reading only from
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# STDIN. Any non-readable files are warned about and skipped. The iterator
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# actually returns a tuple:
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# * A filehandle on the file, opened for reading.
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# * The file name, or undef for STDIN.
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# * The file size, or undef for STDIN.
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# You should use it like this:
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# ( $fh, $name, $size ) = $next_fh->();
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# At the time of requesting the next file from the iterator, the code will skip
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# files that can't be opened, and just return the next one that can be. This
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# way the calling code doesn't have to do any error handling: it either gets a
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# valid filehandle to work on next, or it's done.
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sub get_file_itr {
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my ( $self, @filenames ) = @_;
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my @final_filenames;
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FILENAME:
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foreach my $fn ( @filenames ) {
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if ( !defined $fn ) {
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warn "Skipping undefined filename";
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next FILENAME;
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}
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if ( $fn ne '-' ) {
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if ( !-e $fn || !-r $fn ) {
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warn "$fn does not exist or is not readable";
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next FILENAME;
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}
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}
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push @final_filenames, $fn;
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}
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# If the list of files is empty, read from STDIN.
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if ( !@filenames ) {
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push @final_filenames, '-';
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PTDEBUG && _d('Auto-adding "-" to the list of filenames');
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}
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PTDEBUG && _d('Final filenames:', @final_filenames);
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return sub {
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while ( @final_filenames ) {
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my $fn = shift @final_filenames;
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PTDEBUG && _d('Filename:', $fn);
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if ( $fn eq '-' ) { # Magical STDIN filename.
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return (*STDIN, undef, undef);
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}
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open my $fh, '<', $fn or warn "Cannot open $fn: $OS_ERROR";
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if ( $fh ) {
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return ( $fh, $fn, -s $fn );
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}
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}
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return (); # Avoids $f being set to 0 in list context.
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};
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}
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sub _d {
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my ($package, undef, $line) = caller 0;
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@_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
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map { defined $_ ? $_ : 'undef' }
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@_;
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print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
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}
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1;
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}
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# ###########################################################################
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# End FileIterator package
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# ###########################################################################
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