Signals are not received (missing a call to dbus_bus_add_match?)

[raphj]

Hello,

Thanks for your library, it's very helpful. I'm trying to receive D-BUS signals. I'm using ddbus version 3.0.0-beta.1. My code looks like this:

void main() {
    Connection conn = connectToBus(DBusBusType.DBUS_BUS_SYSTEM);
    auto router = new MessageRouter();
    MessagePattern patt = MessagePattern(
        ObjectPath("/org/freedesktop/ModemManager1/Modem/0"),
        interfaceName("org.freedesktop.ModemManager1.Modem.Messaging"),
        "Added",
        true
    );

    router.setHandler!(void, ObjectPath, bool)(patt, (ObjectPath path, bool received) {
        writeln("Called with ", path, ", ", received);
    });

    registerRouter(conn, router);

    simpleMainLoop(conn);
}

I'm expecting to see Called with lines but I don't receive anything. I do, however, see such lines when I add this line before the call to router.setHandler:

dbus_bus_add_match(conn.conn, "type='signal',interface='org.freedesktop.ModemManager1.Modem.Messaging'", null);

I'm I doing something wrong?

For what it is worth, in ddbus's router.d, registerRouter registers a router like this:

void registerRouter(Connection conn, MessageRouter router) {
    void* routerP = cast(void*) router;
    GC.addRoot(routerP);
    dbus_connection_add_filter(conn.conn, &filterFunc, routerP, &unrootUserData);
}

I would expect to see calls to dbus_bus_add_match for each MessagePattern object added to the router. I can try to write a patch if needed.

By the way, I'm looking for a way to receive signals for any object that implement the given interface, I don't want to specify a particular source. dbus_bus_add_match and dbus_connection_add_filter allow this, but MessagePattern requires specifying an ObjectPath. Would it conceivable to allow specifying null in a MessagePattern?