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|
package App::Glacier::Directory;
use strict;
use warnings;
use parent 'App::Glacier::DB';
use Carp;
use App::Glacier::Timestamp;
our @EXPORT_OK = qw(DIR_UPTODATE DIR_PENDING DIR_OUTDATED);
our %EXPORT_TAGS = ( status => [ qw(DIR_UPTODATE DIR_PENDING DIR_OUTDATED) ] );
use constant DB_INFO_KEY => ';00INFO';
sub new {
my ($class, $backend, $vault, $glacier, %opts) = @_;
(my $vault_name = $vault) =~
s/([^A-Za-z_0-9\.-])/sprintf("%%%02X", ord($1))/gex;
map { $opts{$_} =~ s/\$(?:vault|\{vault\})/$vault_name/g } keys %opts;
my $self = $class->SUPER::new($backend,
%opts,
create => sub { $glacier->describe_vault($vault_name) },
);
if ($self) {
$self->{_vault} = $vault;
$self->{_glacier} = $glacier;
}
return $self;
}
sub vault { shift->{_vault} }
sub glacier { shift->{_glacier} }
# locate(FILE, VERSION)
sub locate {
my ($self, $file, $version) = @_;
$version = 1 unless defined $version;
my $rec = $self->SUPER::retrieve($file);
return undef unless defined $rec || $version-1 > $#{$rec};
return wantarray ? ($rec->[$version-1], $version) : $rec->[$version-1];
}
sub info {
my ($self, $key) = @_;
my $rec = $self->retrieve(DB_INFO_KEY);
return undef unless defined($rec);
return $rec->{$key};
}
sub set_info {
my ($self, $key, $val) = @_;
my $rec = $self->retrieve(DB_INFO_KEY) || {};
$rec->{$key} = $val;
$self->SUPER::store(DB_INFO_KEY, $rec);
}
sub last_sync_time {
my ($self) = @_;
return $self->info('SyncTimeStamp');
}
sub update_sync_time {
my ($self) = @_;
$self->set_info('SyncTimeStamp', time);
}
sub foreach {
my ($self, $code) = @_;
$self->SUPER::foreach(sub {
my ($k, $v) = @_;
&{$code}($k, $v) unless $k eq DB_INFO_KEY;
});
}
sub add_version {
my ($self, $file_name, $val) = @_;
my $rec = $self->retrieve($file_name);
my $i;
if ($rec) {
my $t = $val->{CreationDate}->epoch;
for ($i = 0; $i <= $#{$rec}; $i++) {
last if $t >= $rec->[$i]{CreationDate}->epoch;
}
splice(@{$rec}, $i, 0, $val);
} else {
$i = 0;
$rec = [ $val ];
}
$self->SUPER::store($file_name, $rec);
return $i + 1;
}
sub delete_version {
my ($self, $file_name, $ver) = @_;
$ver--;
my $rec = $self->retrieve($file_name);
if ($rec && $ver <= $#{$rec}) {
splice(@{$rec}, $ver, 1);
if (@{$rec}) {
$self->SUPER::store($file_name, $rec);
} else {
$self->delete($file_name);
}
} else {
++$ver;
croak "can't remove $file_name;$ver: no such version";
}
}
sub tempname {
my ($self, $namelen) = @_;
$namelen = 10 unless defined $namelen;
my @alphabet =
split //,
'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
my @name;
for (my $i = 0; $i < $namelen; $i++) {
push @name, rand($#alphabet);
}
my @orig = @name;
my $s;
while ($self->has($s = 'TMP_'.join('', map { $alphabet[$_] } @name))) {
for (my $i = 0; ; $i++) {
die "all permutations exhausted" if ($i > $namelen);
$name[$i] = ($name[$i] + 1) % @alphabet;
last if $name[$i] != $orig[$i];
}
}
return $s;
}
use constant {
DIR_UPTODATE => 0, # Directory is up to date
DIR_PENDING => 1, # Directory is empty, needs synchronization
DIR_OUTDATED => 2 # Directory needs update
};
sub status {
my ($self) = @_;
if (defined($self->last_sync_time)) {
my $dsc = timestamp_deserialize($self->glacier->Describe_vault($self->vault));
unless ($dsc
&& $dsc->{LastInventoryDate}->epoch < $self->last_sync_time) {
return DIR_OUTDATED;
}
} else {
return DIR_PENDING;
}
return DIR_UPTODATE;
}
1;
|
