Cache-AgainstFile
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lib/Cache/AgainstFile/CacheModule.pm  view on Meta::CPAN 

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                ($last_modified, $data) = @$record;
                unless($self->{options}->{NoStat})
                {
                        my $grace = $self->{options}->{Grace} || 0;
                        my $last_checked = $self->{'stat'}{$filename} || 0;
         
                        #Are we within the grace period since our last stat?
                        unless($grace > time - $last_checked)
                        {
                                TRACE("stat: $filename");
                                $data = undef if((stat($filename))[9] > $last_modified); #stat and maybe mark as stale
                                $self->{'stat'}{$filename} = time;
                        }
                }
        }
        unless(defined $data)
        {
                TRACE("stale: $filename");
                $data = $self->{loader}->($filename, @opts);
                $last_modified = (stat($filename))[9];
                $self->_set($filename, [$last_modified, $data]);
        }
        else
        {
                TRACE("not stale: $filename");
        }
        return $data;   
}
 
#Forward all other methods to backend

lib/Cache/AgainstFile/Memory.pm  view on Meta::CPAN 

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my $source_mtime;
unless ($self->{options}->{NoStat} && !$stale)
{
        #Are we within the grace period since our last stat?
        my $grace = $self->{options}->{Grace} || 0;
        my $last_checked = $self->{'stat'}{$filename} || 0;
        unless($grace > time - $last_checked)
        {
                TRACE("stat: $filename");
                check_safe($filename, "r") if(HAVE_FILE_POLICY);
                $source_mtime = (stat($filename))[9];
                my $last_modified = $self->{modified}{$filename};
                $stale |= (!defined $source_mtime) || (!defined $last_modified) || ($source_mtime ne $last_modified);
                $self->{'stat'}{$filename} = time;
        }
}
my $data;
if($stale)
{
        TRACE("stale memory: $filename");
        $data = $self->{loader}->($filename, @opts);

lib/Cache/AgainstFile/Memory.pm  view on Meta::CPAN 

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sub _accessed {
        my($self) = @_;
        my %atimes = %{$self->{accessed}};
        return \%atimes;
}
 
sub _stale {
        my($self) = @_;
        my $modified = $self->{modified};
        return grep { 
                my $src = (stat($_))[9];
                (!defined $src) || ($src ne $modified->{$_})
        } keys %$modified;
}
 
#
# Log::Trace stubs
#
 
sub TRACE {}
sub DUMP {}

lib/Cache/AgainstFile/Storable.pm  view on Meta::CPAN 

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        my $cache_fh = new FileHandle;
        check_safe($cache_filename,"r") if(HAVE_FILE_POLICY);
        unless ($cache_fh->open($cache_filename)) {
                undef $cache_fh;
                $stale = 1;
        }       
 
        # Compare file mtimes to check staleness                
        my $file_mtime;
        unless ($self->{options}->{NoStat} && !$stale) {
                $file_mtime = (stat($filename))[9];
                my $cache_mtime = ($cache_fh->stat)[9] if $cache_fh;
                $stale = (!defined $file_mtime) || (!defined $cache_mtime) || ($file_mtime != $cache_mtime);
        }
        TRACE("Cache " . ($stale?"is":"is not") . " stale");
 
        #Read from cache
        my $data;
        if (!$stale) {
                $data = eval { $self->{read}->($cache_filename, $cache_fh) };
                if ($@) {
                        warn "Storable couldn't retrieve $cache_filename: $@";
                        $stale = 1;
                }
        }
        $cache_fh->close if $cache_fh;
         
        #Write to cache
        if ($stale) {
                TRACE("writing cache");
                $data = $self->{loader}->($filename, @opts);
                $file_mtime = (stat($filename))[9] unless(defined $file_mtime); #Need mtime now
                $self->{write}->($cache_filename, $data, $file_mtime);
        }
        return $data;
}
 
 
sub count {
        my ($self) = shift;
        my $files_in_cache = $self->_cache_files;
        return scalar @$files_in_cache;

lib/Cache/AgainstFile/Storable.pm  view on Meta::CPAN 

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        }
}
 
sub _accessed {
        my($self) = @_;
        my $cache_dir = $self->{options}{CacheDir};
        my $files_in_cache = $self->_cache_files;
        my %accessed = map
        {
                my $cache_file = catfile($cache_dir, $_);
                $self->_cache2filename($_) => (stat($cache_file))[8]
        }
        @$files_in_cache;
        return \%accessed;
}
 
sub _stale {
        my($self) = @_;
        my $cache_dir = $self->{options}{CacheDir};
        my $files_in_cache = $self->_cache_files;
        my @out =

t/CacheAgainstFile-Memory.t  view on Meta::CPAN 

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touch($filename);
 
 
############################################################################
# Memory caching
############################################################################
my $mem_cache = new Cache::AgainstFile($callback, {Method => 'Memory'});
ASSERT($mem_cache->{method} eq 'Memory', "Memory backend");
test_basics($mem_cache, $filename, undef, $size_not_available); 
$mem_cache = new Cache::AgainstFile($callback, {Method => 'Memory', 'NoStat' => 1}); 
test_nostat($mem_cache, $filename);
$mem_cache = new Cache::AgainstFile($callback, {Method => 'Memory', 'MaxItems' => 3});
test_max_items($mem_cache, $dir, 3);
$mem_cache = new Cache::AgainstFile($callback, {Method => 'Cache::AgainstFile::Memory', 'MaxATime' => (2.5 * SLEEP_INT)}); #fq backend
test_old_items($mem_cache, $dir, 5, 3);
 
############################################################################
# Clean up
############################################################################
END {
        TRACE("Cleaning up $dir");

t/CacheAgainstFile-Storable.t  view on Meta::CPAN 

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goto trans if($opt_d);
 
############################################################################
### Disk caching
############################################################################
my $disk_cache = new Cache::AgainstFile($callback, {Method => 'Storable', 'CacheDir' => $cache_dir});
ASSERT($disk_cache->{method} eq 'Storable', "Storable caching");
test_basics($disk_cache, $filename);
$disk_cache = new Cache::AgainstFile($callback, {Method => 'Storable', 'CacheDir' => $cache_dir."/", 'NoStat' => 1, Locking => 'Flock'});
test_nostat($disk_cache, $filename);
$disk_cache = new Cache::AgainstFile($callback, {Method => 'Storable', 'CacheDir' => $cache_dir, 'MaxItems' => 2, Locking => 'AtomicWrite'});
test_max_items($disk_cache, $dir, 2);
 
#delete the cache dir so we have to create it
rmtree($cache_dir);
$disk_cache = new Cache::AgainstFile($callback, {Method => 'Cache::AgainstFile::Storable', 'CacheDir' => $cache_dir, 'MaxATime' => (2.5 * SLEEP_INT)}); #fq backend
rmtree($cache_dir); #delete underneath cache
ASSERT(DIED(sub {
        $disk_cache->count()
}) && $@ =~ /unable to open directory/, "failed dir read raises exception");

t/CacheAgainstFile.lib  view on Meta::CPAN 

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#Touch the file
sleep( SLEEP_INT );
touch( $filename );
$callcount = 0;
ASSERT($cache->get($filename) eq "filename:$filename" && $callcount == 1, "$method: touch => stat & cache miss (call count $callcount)");
 
#Sneak a sourcefile change in through vulnerable window
sleep (SLEEP_INT);
$callcount = 0;
touch ($filename);
$m_before = (stat($filename))[9];
$loaddelay = 5;
ASSERT($cache->get($filename) eq "filename:$filename" && $callcount == 1, "$method: touch => stat & cache miss (call count $callcount)");
# "While we were calculating", the sourcefile was modified
$m_before++;
(utime $m_before, $m_before, $filename) or die "couldn't posttouch $filename: $!";
$callcount = 0;
$cache->get($filename);
ASSERT($callcount == 1, "window-of-vulnerability check");
$loaddelay = 0;



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