Benedikt 94d174c33d Discovery: Refactor and add Avahi DBus backend (#1347) ... * discovery: use opaque error type for DnsSdError This helps to decouple discovery and core by not leaking implementation details of the zeroconf backend into Error conversion impls in core. * discovery: map all MDNS/DNS-SD errors to DiscoveryError::DnsSdError previously, libmdns errors would use a generic conversion from std::io::Error to core::Error * discovery: use an opaque type for the handle to the DNS-SD service * discovery: make features additive i.e. add with-libmdns instead of using not(with-dns-sd). The logic is such that enabling with-dns-sd in addition to the default with-libmdns will still end up using dns-sd, as before. If only with-libmdns is enabled, that will be the default. If none of the features is enabled, attempting to build a `Discovery` will yield an error. * discovery: add --zeroconf-backend CLI flag * discovery: Add minimal Avahi zeroconf backend * bump MSRV to 1.75 required by zbus >= 4 * discovery: ensure that server and dns-sd backend shutdown gracefully Previously, on drop the the shutdown_tx/close_tx, it wasn't guaranteed the corresponding tasks would continue to be polled until they actually completed their shutdown. Since dns_sd::Service is not Send and non-async, and because libmdns is non-async, put them on their own threads. * discovery: use a shared channel for server and zeroconf status messages * discovery: add Avahi reconnection logic This deals gracefully with the case where the Avahi daemon is restarted or not running initially. * discovery: allow running when compiled without zeroconf backend... ...but exit with an error if there's no way to authenticate * better error messages for invalid options with no short flag		2024-10-26 16:45:02 +02:00
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test.yml	Discovery: Refactor and add Avahi DBus backend (#1347)	2024-10-26 16:45:02 +02:00