The current implementation in Kademlia relies on an external address to determine if it should be in client or server mode. However there are instances where a node, which may know an external address, wishes to remain in client mode and switch to server mode at a later point.
This PR introduces `Kademlia::set_mode`, which accepts an `Option<Mode>` that would allow one to set `Mode::Client` for client mode, `Mode::Server` for server mode, or `None` to determine if we should operate as a client or server based on our external addresses.
Resolves#4074.
Pull-Request: #4132.
This resolves an issue where our tests were depending on the number of network interfaces available on the local machine.
Related #4110.
Pull-Request: #4122.
Co-Authored-By: Thomas Eizinger <thomas@eizinger.io>
Currently, the kademlia behaviour can only learn that the remote node supports kademlia on a particular connection if we successfully negotiate a stream to them.
Using the newly introduced abstractions from #3651, we don't have to attempt to establish a stream to the remote to learn whether they support kademlia on a connection but we can directly learn it from the `ConnectionEvent::RemoteProtocolsChange` event. This happens directly once a connection is established which should overall benefit the DHT.
Clients do not advertise the kademlia protocol and thus we will immediately learn that a given connection is not suitable for kadmelia requests. We may receive inbound messages from it but this does not affect the routing table.
Resolves: #2032.
Pull-Request: #3877.
