1 files changed, 134 insertions, 0 deletions
diff --git a/lib/App/XScreenSaver/DBus/Saver.pm b/lib/App/XScreenSaver/DBus/Saver.pm
new file mode 100644
index 0000000..6ae6e69
--- /dev/null
+++ b/lib/App/XScreenSaver/DBus/Saver.pm
@@ -0,0 +1,134 @@
+package App::XScreenSaver::DBus::Saver;
+use Moo;
+use experimental 'signatures';
+use curry;
+use Log::Any;
+use Try::Tiny;
+use App::XScreenSaver::DBus::SaverProxy;
+
+has reactor => ( is => 'ro', required => 1 );
+has bus => ( is => 'lazy', builder => sub { Net::DBus->session() } );
+has dbus_srv => (
+    is => 'lazy',
+    builder => sub { shift->bus->get_service('org.freedesktop.DBus') },
+);
+has dbus_obj => (
+    is => 'lazy',
+    builder => sub { shift->dbus_srv->get_object('/org/freedesktop/DBus') },
+);
+
+has service => (
+    is => 'lazy',
+    builder => sub {
+        # this is the service name
+        shift->bus->export_service('org.freedesktop.ScreenSaver');
+    },
+);
+has paths => (
+    is => 'ro',
+    default => sub { [qw(/ScreenSaver /org/freedesktop/ScreenSaver)] },
+);
+
+has log => ( is => 'lazy', builder => sub { Log::Any->get_logger } );
+
+has _impls => ( is => 'rw' );
+has _prod_id => ( is => 'rw' );
+has _inhibits => ( is => 'rw', default => sub { +{} } );
+
+sub start($self) {
+    my $inhibit_cb = $self->curry::weak::inhibit;
+    my $uninhibit_cb = $self->curry::weak::uninhibit;
+
+    $self->_impls([ map {
+        App::XScreenSaver::DBus::SaverProxy->new(
+            $self->service,
+            $_,
+            $inhibit_cb,
+            $uninhibit_cb,
+        )
+    } $self->paths->@* ]);
+
+    $self->_prod_id(
+        $self->reactor->add_timeout(
+            60_000,
+            Net::DBus::Callback->new(
+                method => $self->curry::weak::prod_screensaver
+            ),
+            0,
+        ),
+    );
+
+    $self->dbus_obj->connect_to_signal(
+        'NameOwnerChanged',
+        $self->curry::weak::name_owner_changed,
+    );
+
+    return;
+}
+
+sub inhibit($self,$name,$reason,$message) {
+    my $cookie;
+    do {
+        $cookie = int(rand(2**31))
+    } until !exists $self->_inhibits->{$cookie};
+
+    my $sender = $message->get_sender;
+    $self->_inhibits->{$cookie} = [ $name, $reason, $sender ];
+
+    $self->log->debugf(
+        '<%s> (%s) stops screensaver for <%s> (cookie %d) - %d active',
+        $name, $sender, $reason, $cookie, scalar(keys $self->_inhibits->%*),
+    );
+    $self->reactor->toggle_timeout($self->_prod_id, 1);
+
+    return $cookie;
+}
+
+sub uninhibit($self,$cookie,$message) {
+    my $inhibit = delete $self->_inhibits->{$cookie}
+        or return;
+    my ($name, $reason, $sender) = @$inhibit;
+    my $this_sender = $message->get_sender;
+
+    $self->log->debugf(
+        '<%s> (was %s, is %s) resumed screensaver for <%s> (cookie %d) - %d left',
+        $name, $sender, $this_sender, $reason, $cookie, scalar(keys $self->_inhibits->%*),
+    );
+
+    $self->reactor->toggle_timeout($self->_prod_id, 0)
+        unless $self->_inhibits->%*;
+
+    return;
+}
+
+sub name_owner_changed($self,$bus_name,$old,$new) {
+    $self->log->tracef('<%s> changed from <%s> to <%s>',
+                 $bus_name, $old, $new);
+
+    for my $cookie (sort keys $self->_inhibits->%*) {
+        my ($name, $reason, $sender) = @{$self->_inhibits->{$cookie}};
+        # is this inhibit from that bus name?
+        next unless $sender && $sender eq $bus_name;
+        # did the bus owner just disconnect?
+        next unless $old && !$new;
+
+        # if so, remove the inhibit
+        my $inhibit = delete $self->_inhibits->{$cookie};
+
+        $self->log->debugf(
+            '<%s> (%s) disconnected from the bus (it stopped screensaver for <%s>, cookie %d) - %d left',
+            $name, $bus_name, $reason, $cookie, scalar(keys $self->_inhibits->%*),
+        );
+    }
+
+    unless ($self->_inhibits->%*) {
+        $self->reactor->toggle_timeout($self->_prod_id, 0);
+    }
+}
+
+sub prod_screensaver($self) {
+    $self->log->debug('prodding xscreensaver');
+    system(qw(xscreensaver-command -deactivate));
+}
+
+1;