How does bootstrapping work in rust-libp2p 's Kademlia implementation?

[whereistejas]

Hi,
I have been trying to implement a Kademlia network with bootstrapping.
All the code, I'm referrring to can be found here and specifically in this test file.

My test is setup in the following manner:
I have 5 peers: A, B, C, D and E.

They are connected in the following manner (and, sequence):

1. A is connected to B, B is connected to C.
2. D is connected to E.
3. A is connected to D ( I bootstrap A at this point )

The result I expect from this is that A should discover E.
And, A's routing table should have E's peer ID.

However, this is not happening.
Here is the code snippet:

// Connect A --> B, B --> C.
for i in 1..3 {
    let peerid = peeraddr[i].0.clone();
    let addr = peeraddr[i].1.clone();
    clients[i - 1].dial(peerid, addr).await;
}

// Connect D --> E.
for i in 4..5 {
    let peerid = peeraddr[i].0.clone();
    let addr = peeraddr[i].1.clone();
    clients[i - 1].dial(peerid, addr).await;
}

// Connect A --> D.
let peerid = peeraddr[3].0.clone();
let addr = peeraddr[3].1.clone();
clients[0].dial(peerid, addr).await;

// A should find E.
clients[0].bootstrap().await;

let known_peers = clients[0].known_peers().await;
let peerid = peeraddr[4].0.clone();

assert!(known_peers.contains(&peerid));

Do I need to enable any config flag of some kind without which the routing tables won't get updated?

[whereistejas]

So, apparently, one needs to wait for all the pending bootstrap requests to finish, meaning we need QueryResult::BootStrap where the num_remaining = 0.