| 5 |
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# |
| 6 |
|
# Description |
| 7 |
|
# ----------- |
| 8 |
< |
# Simple url->file lookup |
| 8 |
> |
# Simple url->file lookup (persistent) |
| 9 |
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# |
| 10 |
|
# Interface |
| 11 |
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# --------- |
| 12 |
< |
# new(cachedir) : A new URLcache object |
| 12 |
> |
# new(cachedir) : A new URLcache object in a given directory |
| 13 |
|
# store(url,file) : store a url/file combination |
| 14 |
< |
# file(url) : retunr the file for a given url or "" if not there |
| 14 |
> |
# file(url) : return the file for a given url |
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# delete(url) : remove from cache url |
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# clear() : clear cache |
| 17 |
+ |
# filestore() : Return the directory to download files to |
| 18 |
+ |
# filename(url) : return a unique file/dir in cache for the given url |
| 19 |
+ |
# updatenumber(int) : return an integer number changed with each store |
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|
| 21 |
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package URL::URLcache; |
| 22 |
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require 5.004; |
| 30 |
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return $self; |
| 31 |
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} |
| 32 |
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|
| 33 |
+ |
sub filestore { |
| 34 |
+ |
my $self=shift; |
| 35 |
+ |
return $self->{cachedir}; |
| 36 |
+ |
} |
| 37 |
+ |
|
| 38 |
+ |
sub filename { |
| 39 |
+ |
my $self=shift; |
| 40 |
+ |
my $url=shift; |
| 41 |
+ |
|
| 42 |
+ |
my $filenumber; |
| 43 |
+ |
|
| 44 |
+ |
my $file=$self->file($url); |
| 45 |
+ |
if ( $file eq "" ) { |
| 46 |
+ |
# need to generate a new filename - a random number will do |
| 47 |
+ |
srand(); |
| 48 |
+ |
do { |
| 49 |
+ |
$filenumber=int(rand 9999999)+1; |
| 50 |
+ |
$file=$self->filestore()."/".$filenumber; |
| 51 |
+ |
} until ( ! ( -e $file ) ); |
| 52 |
+ |
} |
| 53 |
+ |
return $file; |
| 54 |
+ |
} |
| 55 |
+ |
|
| 56 |
|
sub init { |
| 57 |
|
my $self=shift; |
| 58 |
< |
$self->{cachedir}=shift; |
| 58 |
> |
$self->{cachetop}=shift; |
| 59 |
> |
$self->{cachedir}=$self->{cachetop}."/files"; |
| 60 |
> |
AddDir::adddir($self->{cachedir}); |
| 61 |
|
|
| 62 |
< |
$self->{cacheindex}=$self->{cachedir}."/index.db"; |
| 62 |
> |
$self->{cacheindex}=$self->{cachetop}."/index.db"; |
| 63 |
> |
$self->{cacheseqindex}=$self->{cachetop}."/seqnumb.db"; |
| 64 |
|
$self->{urlDB}=Utilities::HashDB->new(); |
| 65 |
+ |
$self->{urlDBupdate}=Utilities::HashDB->new(); |
| 66 |
|
if ( -f $self->{cacheindex} ) { |
| 67 |
|
$self->{urlDB}->restore($self->{cacheindex}); |
| 68 |
|
} |
| 69 |
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else { |
| 70 |
|
AddDir::adddir($self->{cachedir}); |
| 71 |
|
} |
| 72 |
+ |
if ( -f $self->{cacheseqindex} ) { |
| 73 |
+ |
$self->{urlDBupdate}->restore($self->{cacheseqindex}); |
| 74 |
+ |
} |
| 75 |
|
} |
| 76 |
|
|
| 77 |
|
sub file { |
| 78 |
|
my $self=shift; |
| 79 |
|
my $url=shift; |
| 80 |
|
|
| 81 |
< |
my $found; |
| 82 |
< |
($found)=$self->{urlDB}->getdata($url); |
| 50 |
< |
return ( ($found eq "")?"":$found); |
| 81 |
> |
my @found=$self->{urlDB}->getdata($url); |
| 82 |
> |
return ( ($#found == -1)?"":$found[0]); |
| 83 |
|
} |
| 84 |
|
|
| 85 |
|
sub delete { |
| 86 |
|
my $self=shift; |
| 87 |
|
my $url=shift; |
| 88 |
+ |
unlink ($self->{urlDB}->getdata($URL)); |
| 89 |
|
$self->{urlDB}->deletedata($url); |
| 90 |
|
$self->{urlDB}->store($self->{cacheindex}); |
| 91 |
|
} |
| 98 |
|
$self->{urlDB}->deletedata($url); |
| 99 |
|
$self->{urlDB}->setdata($file,$url); |
| 100 |
|
$self->{urlDB}->store($self->{cacheindex}); |
| 101 |
+ |
|
| 102 |
+ |
# Keep a track of changes |
| 103 |
+ |
my ($sequencenumber)=$self->{urlDBupdate}->getdata($url); |
| 104 |
+ |
if ( ! defined $sequencenumber ) { $sequencenumber=0 }; |
| 105 |
+ |
$sequencenumber=$sequencenumber+1; |
| 106 |
+ |
$self->{urlDBupdate}->deletedata($url); |
| 107 |
+ |
$self->{urlDBupdate}->setdata($sequencenumber,$url); |
| 108 |
+ |
$self->{urlDBupdate}->store($self->{cacheseqindex}); |
| 109 |
+ |
} |
| 110 |
+ |
|
| 111 |
+ |
sub updatenumber { |
| 112 |
+ |
my $self=shift; |
| 113 |
+ |
my $url=shift; |
| 114 |
+ |
|
| 115 |
+ |
return $self->{urlDBupdate}->getdata($url); |
| 116 |
|
} |
| 117 |
|
|
| 118 |
|
sub clear { |
| 119 |
|
my $self=shift; |
| 120 |
< |
unlink $self->{cacheindex}; |
| 120 |
> |
foreach $item ( $self->{urlDB}->match() ) { |
| 121 |
> |
$self->delete($item->keys()); |
| 122 |
> |
} |
| 123 |
|
} |
