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package JWebmail::Plugin::ServerSideSessionData v1.1.0;
use Mojo::Base Mojolicious::Plugin;
use Fcntl qw(:DEFAULT :seek);
use Time::HiRes 'sleep';
use Mojo::JSON qw(decode_json encode_json);
use Mojo::File;
use constant {
S_KEY => 's3d.key',
CLEANUP_FILE_NAME => 'cleanup',
LOCK_ITER => 5,
ADVANCE_ON_FAILURE => 10, # seconds to retry to acquire the lock
};
has 'session_directory';
has 'expiration';
has 'cleanup_interval';
has _next_cleanup => 0;
# read and potentially update file return bool
# needs atomic lock file
# the file contains a single timestamp
sub _rw_cleanup_file {
my $self = shift;
my $time = shift;
my $lock_name = $self->session_directory->child(CLEANUP_FILE_NAME . '.lock');
my $info_name = $self->session_directory->child(CLEANUP_FILE_NAME . '.info');
my ($lock, $ctr, $rmlock);
until (sysopen($lock, $lock_name, O_WRONLY | O_CREAT | O_EXCL)) {
die "unexpected error '$!'" unless $! eq 'File exists'; # TODO: rework err check
if ($ctr > LOCK_ITER) {
open($lock, '<', $lock_name) or die "unexpected error '$!'";
my $pid = <$lock>;
close $lock;
chomp $pid;
if (!$rmlock && (!$pid || !-e "/proc/$pid")) {
$lock_name->remove;
$rmlock = 1;
next;
}
$self->_next_cleanup($time + ADVANCE_ON_FAILURE);
return 0;
}
sleep(0.01); # TODO: better spin locking
} continue {
$ctr++;
}
$lock->say($$);
$lock->close;
my $ret = eval {
use autodie;
open(my $info, -e $info_name ? '+<' : '+>', $info_name);
my $next_time = $info->getline // '';
$next_time = 0 unless $next_time =~ /^\d+$/a;
chomp $next_time;
if ($next_time > $time) {
$info->close;
$self->_next_cleanup($next_time);
return 0;
}
else {
$info->truncate(0);
$info->seek(0, SEEK_SET);
$info->say($time + $self->cleanup_interval);
$info->close;
$self->_next_cleanup($time + $self->cleanup_interval);
return 1;
}
};
$lock_name->remove;
return $ret;
}
sub cleanup_files {
my $self = shift;
my $t = time;
if ($self->_next_cleanup < $t && $self->_rw_cleanup_file($t)) {
for ($self->session_directory->list->each) {
if ( $_->stat->mtime + $self->expiration < $t ) {
$_->remove;
}
}
}
}
sub s3d {
my $self = shift;
my $c = shift;
my ($key, $val) = @_;
# cleanup old sessions
$self->cleanup_files;
my $file = $self->session_directory->child($c->session(S_KEY) || $c->req->request_id . $$);
if (-e $file) {
if ($file->stat->mtime + $self->expiration < time) {
truncate $file, 0;
}
else {
$file->touch;
}
}
elsif (defined $val) {
$file->touch;
$file->chmod(0600);
$c->session(S_KEY, $file->basename);
}
my $data = -s $file ? decode_json($file->slurp) : {};
if (defined $val) { # set
$data->{$key} = $val;
$file->spurt(encode_json $data, "\n");
return $self;
}
else { # get
return defined $key ? $data->{$key} : $data;
}
}
sub register {
my ($self, $app, $conf) = @_;
$conf //= {};
$self->session_directory(Mojo::File->new($conf->{directory} || "/tmp/" . $app->moniker));
$self->expiration($conf->{expiration} || $app->sessions->default_expiration);
$self->cleanup_interval($conf->{cleanup_interval} || $self->expiration);
unless (-d $self->session_directory) {
mkdir($self->session_directory)
or $! ? die "failed to create directory: $!" : 1;
}
$self->cleanup_files;
$app->helper( s3d => sub { $self->s3d(@_) } );
$app->helper( s3d_close => sub { delete shift->session->{S_KEY()} } );
}
1
__END__
=encoding utf-8
=head1 NAME
ServeSideSessionData - Stores session data on the server (alias SSSD or S3D)
=head1 SYNOPSIS
$app->plugin('ServeSideSessionData', {expiration => 20*60});
$c->s3d(data => 'Hello, S3D');
$c->s3d('data');
=head1 DESCRIPTION
Store data temporarily on the server.
The only protection on the server are strict user access rights
so you need to still be careful with your secrets.
=head1 OPTIONS
=head2 directory
directory where session data is stored
default C<< 'tmp/' . $app->moniker >>
=head2 expiration
how long is a server side session valid in seconds (calculated after last access)
defaults to session expiration
=head2 cleanup_interval
a recurring time interval when old session data gets cleaned up
defaults to expiration
=head1 HELPERS
=head2 s3d
Stores and retrieves values.
$c->s3d(data => 'Hello, S3D');
$c->s3d('data');
$c->s3d->{data};
=head2 s3d_close
Session is closed. You will not have access to it any more.
$c->s3d_close;
=cut
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