/usr/share/perl5/Apache/Session/Store/File.pm is in libapache-session-perl 1.93-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Apache::Session::Store::File
# Implements session object storage via flat files
# Copyright(c) 1998, 1999, 2000, 2004 Jeffrey William Baker (jwbaker@acm.org)
# Distribute under the Perl License
#
############################################################################
package Apache::Session::Store::File;
use strict;
use Symbol;
use IO::File;
use Fcntl;
use vars qw($VERSION);
$VERSION = '1.04';
$Apache::Session::Store::File::Directory = '/tmp';
sub new {
my $class = shift;
my $self;
$self->{fh} = Symbol::gensym();
$self->{opened} = 0;
return bless $self, $class;
}
sub insert {
my $self = shift;
my $session = shift;
my $directory = $session->{args}->{Directory} || $Apache::Session::Store::File::Directory;
if (-e $directory.'/'.$session->{data}->{_session_id}) {
die "Object already exists in the data store";
}
my $file = $directory.'/'.$session->{data}->{_session_id};
sysopen ($self->{fh}, $file, O_RDWR|O_CREAT) ||
die "Could not open file $file: $!";
$self->{opened} = 1;
print {$self->{fh}} $session->{serialized};
$self->{fh}->flush();
}
sub update {
my $self = shift;
my $session = shift;
my $directory = $session->{args}->{Directory} || $Apache::Session::Store::File::Directory;
if (!$self->{opened}) {
my $file = $directory.'/'.$session->{data}->{_session_id};
sysopen ($self->{fh}, $file, O_RDWR|O_CREAT) ||
die "Could not open file $file: $!";
$self->{opened} = 1;
}
truncate($self->{fh}, 0) || die "Could not truncate file: $!";
seek($self->{fh}, 0, 0);
print {$self->{fh}} $session->{serialized};
$self->{fh}->flush();
}
sub materialize {
my $self = shift;
my $session = shift;
my $directory = $session->{args}->{Directory} || $Apache::Session::Store::File::Directory;
my $file = $directory.'/'.$session->{data}->{_session_id};
if (-e $file) {
if (!$self->{opened}) {
sysopen ($self->{fh}, $file, O_RDWR|O_CREAT) ||
die "Could not open file $file: $!";
$self->{opened} = 1;
}
else {
seek($self->{fh}, 0, 0) || die "Could not seek file: $!";
}
$session->{serialized} = '';
my $fh = $self->{fh};
while (my $line = <$fh>) {
$session->{serialized} .= $line;
}
}
else {
die "Object does not exist in the data store";
}
}
sub remove {
my $self = shift;
my $session = shift;
my $directory = $session->{args}->{Directory} || $Apache::Session::Store::File::Directory;
if ($self->{opened}) {
CORE::close $self->{fh};
$self->{opened} = 0;
}
my $file = $directory.'/'.$session->{data}->{_session_id};
if (-e $file) {
unlink ($file) ||
die "Could not remove file $file: $!";
}
else {
die "Object does not exist in the data store";
}
}
sub close {
my $self = shift;
if ($self->{opened}) {
CORE::close $self->{fh};
$self->{opened} = 0;
}
}
sub DESTROY {
my $self = shift;
if ($self->{opened}) {
CORE::close $self->{fh};
}
}
1;
=pod
=head1 NAME
Apache::Session::Store::File - Store persistent data on the filesystem
=head1 SYNOPSIS
use Apache::Session::Store::File;
my $store = new Apache::Session::Store::File;
$store->insert($ref);
$store->update($ref);
$store->materialize($ref);
$store->remove($ref);
=head1 DESCRIPTION
This module fulfills the storage interface of Apache::Session. The serialized
objects are stored in files on your filesystem.
=head1 OPTIONS
This module requires one argument in the usual Apache::Session style. The
name of the option is Directory, and the value is the full path of the
directory where you wish to place the files. Example
tie %s, 'Apache::Session::File', undef,
{Directory => '/tmp/sessions'};
=head1 NOTES
All session objects are stored in the same directory. Some filesystems, such
as Linux's ext2fs, have O(n) performance where n is the number of files in a
directory. Other filesystems, like Sun's UFS, and Linux's reiserfs, do not
have this problem. You should consider your filesystem's performance before
using this module to store many objects.
=head1 AUTHOR
This module was written by Jeffrey William Baker <jwbaker@acm.org>.
=head1 SEE ALSO
L<Apache::Session>
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