How do I know that the Kademlia bootstrap process failed?

[vnermolaev]

Hi!

Imagine a libp2p-enabled node connecting with other nodes using Kademlia DHT with a few bootstrap nodes.
If there is a single bootstrap node, I can deduce that the bootstrap node connection attempt failed by observing

SwarmEvent::OutgoingConnectionError {
    connection_id,
    peer_id,
    error,
}

If there are multiple bootstrap nodes, I could, ofc, track which connections failed to deduce that the bootstrapping process failed. My question is: Is there a specific event stating that bootstrapping has failed independently of how many bootstrap nodes there are?

[vnermolaev]

If anyone wonders, the way it works is

• all bootstrap nodes are listed as a single query to connect to,
• the query will complete with stats on how many nodes have been reached,
• one can observe the stats by catching the event

 kad::Event::OutboundQueryProgressed {
     stats,
     step: kad::ProgressStep { last, .. },
     ..
 } if last => {
     let mut update = format!(
         "Bootstrap nodes connection status (success)/(failure)/(total): ({})/({})/({})",
         stats.num_successes(),
         stats.num_failures(),
         stats.num_requests()
     );
     ....
}