| 1 |
williamc |
1.1 |
#
|
| 2 |
|
|
# URLcache.pm
|
| 3 |
|
|
#
|
| 4 |
|
|
# Originally Written by Christopher Williams
|
| 5 |
|
|
#
|
| 6 |
|
|
# Description
|
| 7 |
|
|
# -----------
|
| 8 |
williamc |
1.2 |
# Simple url->file lookup (persistent)
|
| 9 |
williamc |
1.1 |
#
|
| 10 |
|
|
# Interface
|
| 11 |
|
|
# ---------
|
| 12 |
williamc |
1.2 |
# new(cachedir) : A new URLcache object in a given directory
|
| 13 |
williamc |
1.1 |
# store(url,file) : store a url/file combination
|
| 14 |
williamc |
1.2 |
# file(url) : return the file for a given url
|
| 15 |
williamc |
1.1 |
# delete(url) : remove from cache url
|
| 16 |
|
|
# clear() : clear cache
|
| 17 |
williamc |
1.2 |
# filestore() : Return the directory to download files to
|
| 18 |
|
|
# filename(url) : return a unique file/dir in cache for the given url
|
| 19 |
williamc |
1.1 |
|
| 20 |
|
|
package URL::URLcache;
|
| 21 |
|
|
require 5.004;
|
| 22 |
|
|
use Utilities::HashDB;
|
| 23 |
|
|
|
| 24 |
|
|
sub new {
|
| 25 |
|
|
my $class=shift;
|
| 26 |
|
|
$self={};
|
| 27 |
|
|
bless $self, $class;
|
| 28 |
|
|
$self->init(@_);
|
| 29 |
|
|
return $self;
|
| 30 |
|
|
}
|
| 31 |
|
|
|
| 32 |
williamc |
1.2 |
sub filestore {
|
| 33 |
|
|
my $self=shift;
|
| 34 |
|
|
return $self->{cachedir};
|
| 35 |
|
|
}
|
| 36 |
|
|
|
| 37 |
|
|
sub filename {
|
| 38 |
|
|
my $self=shift;
|
| 39 |
|
|
my $url=shift;
|
| 40 |
|
|
|
| 41 |
|
|
my $filenumber;
|
| 42 |
|
|
|
| 43 |
|
|
my $file=$self->file($url);
|
| 44 |
|
|
if ( $file eq "" ) {
|
| 45 |
|
|
# need to generate a new filename - a random number will do
|
| 46 |
|
|
srand();
|
| 47 |
|
|
do {
|
| 48 |
|
|
$filenumber=int(rand 9999999)+1;
|
| 49 |
|
|
$file=$self->filestore()."/".$filenumber;
|
| 50 |
|
|
} until ( ! ( -e $file ) );
|
| 51 |
|
|
}
|
| 52 |
|
|
return $file;
|
| 53 |
|
|
}
|
| 54 |
|
|
|
| 55 |
williamc |
1.1 |
sub init {
|
| 56 |
|
|
my $self=shift;
|
| 57 |
williamc |
1.2 |
$self->{cachetop}=shift;
|
| 58 |
|
|
$self->{cachedir}=$self->{cachetop}."/files";
|
| 59 |
|
|
AddDir::adddir($self->{cachedir});
|
| 60 |
williamc |
1.1 |
|
| 61 |
williamc |
1.2 |
$self->{cacheindex}=$self->{cachetop}."/index.db";
|
| 62 |
williamc |
1.1 |
$self->{urlDB}=Utilities::HashDB->new();
|
| 63 |
|
|
if ( -f $self->{cacheindex} ) {
|
| 64 |
|
|
$self->{urlDB}->restore($self->{cacheindex});
|
| 65 |
|
|
}
|
| 66 |
|
|
else {
|
| 67 |
|
|
AddDir::adddir($self->{cachedir});
|
| 68 |
|
|
}
|
| 69 |
|
|
}
|
| 70 |
|
|
|
| 71 |
|
|
sub file {
|
| 72 |
|
|
my $self=shift;
|
| 73 |
|
|
my $url=shift;
|
| 74 |
|
|
|
| 75 |
williamc |
1.2 |
my @found=$self->{urlDB}->getdata($url);
|
| 76 |
|
|
return ( ($#found == -1)?"":$found[0]);
|
| 77 |
williamc |
1.1 |
}
|
| 78 |
|
|
|
| 79 |
|
|
sub delete {
|
| 80 |
|
|
my $self=shift;
|
| 81 |
|
|
my $url=shift;
|
| 82 |
williamc |
1.2 |
unlink ($self->{urlDB}->getdata($URL));
|
| 83 |
williamc |
1.1 |
$self->{urlDB}->deletedata($url);
|
| 84 |
|
|
$self->{urlDB}->store($self->{cacheindex});
|
| 85 |
|
|
}
|
| 86 |
|
|
|
| 87 |
|
|
sub store {
|
| 88 |
|
|
my $self=shift;
|
| 89 |
|
|
my $url=shift;
|
| 90 |
|
|
my $file=shift;
|
| 91 |
|
|
|
| 92 |
|
|
$self->{urlDB}->deletedata($url);
|
| 93 |
|
|
$self->{urlDB}->setdata($file,$url);
|
| 94 |
|
|
$self->{urlDB}->store($self->{cacheindex});
|
| 95 |
|
|
}
|
| 96 |
|
|
|
| 97 |
|
|
sub clear {
|
| 98 |
|
|
my $self=shift;
|
| 99 |
williamc |
1.2 |
foreach $item ( $self->{urlDB}->match() ) {
|
| 100 |
|
|
$self->delete($item->keys());
|
| 101 |
|
|
}
|
| 102 |
williamc |
1.1 |
}
|
