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-rw-r--r--lib/Devscripts/JSONCache.pm99
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/Devscripts/JSONCache.pm b/lib/Devscripts/JSONCache.pm
new file mode 100644
index 0000000..cf056c0
--- /dev/null
+++ b/lib/Devscripts/JSONCache.pm
@@ -0,0 +1,99 @@
+package Devscripts::JSONCache;
+
+use strict;
+use JSON;
+use Moo;
+
+has file => (is => 'rw', required => 1);
+
+has saved => (is => 'rw');
+
+has _data => (is => 'rw');
+
+sub save_sec {
+ my ($self, $obj) = @_;
+ my $tmp = umask;
+ umask 0177;
+ open(my $fh, '>', $self->file) or ($self->saved(1) and die $!);
+ print $fh JSON::to_json($obj);
+ close $fh;
+ umask $tmp;
+}
+
+sub data {
+ my ($self) = @_;
+ return $self->_data if $self->_data;
+ my $res;
+ if (-r $self->file) {
+ open(F, $self->file) or ($self->saved(1) and die $!);
+ $res = JSON::from_json(join('', <F>) || "{}");
+ close F;
+ } else {
+ $self->save_sec({});
+ $self->saved(0);
+ }
+ return $self->_data($res);
+}
+
+sub TIEHASH {
+ my $r = shift->new({
+ file => shift,
+ @_,
+ });
+ # build data
+ $r->data;
+ return $r;
+}
+
+sub FETCH {
+ return $_[0]->data->{ $_[1] };
+}
+
+sub STORE {
+ $_[0]->data->{ $_[1] } = $_[2];
+}
+
+sub DELETE {
+ delete $_[0]->data->{ $_[1] };
+}
+
+sub CLEAR {
+ $_[0]->save({});
+}
+
+sub EXISTS {
+ return exists $_[0]->data->{ $_[1] };
+}
+
+sub FIRSTKEY {
+ my ($k) = sort { $a cmp $b } keys %{ $_[0]->data };
+ return $k;
+}
+
+sub NEXTKEY {
+ my ($self, $last) = @_;
+ my $i = 0;
+ my @keys = map {
+ return $_ if ($i);
+ $i++ if ($_ eq $last);
+ return ()
+ }
+ sort {
+ $a cmp $b
+ } keys %{ $_[0]->data };
+ return @keys ? $keys[0] : ();
+}
+
+sub SCALAR {
+ return scalar %{ $_[0]->data };
+}
+
+sub save {
+ return if ($_[0]->saved);
+ eval { $_[0]->save_sec($_[0]->data); };
+ $_[0]->saved(1);
+}
+
+*DESTROY = *UNTIE = *save;
+
+1;