[Bug Report] The endpoint triggers an exception if it is empty

[jackzhhuang]

Bug Report

Starcoin version:

Current behavior:

The endpoint in network-p2p module triggers an exception if it is empty when trying to get the network state by the console command.

The reason for this issue is that even though the endpoint was defined with a fixed length, if it is not initialized, it remains empty. Therefore, accessing it will still generate an exception.

Here's the translation of the code snippet:

network-p2p/src/service.rs:415

let endpoint = if let Some(e) = swarm.behaviour_mut().node(peer_id).map(|i| i.endpoint()) {
    e.clone().into()
} else {
    error!(target: "sub-libp2p", "Found state inconsistency between custom protocol \
and debug information about {:?}", peer_id);
    return None;
};

network-p2p/peer_info.rs:142

pub struct Node<'a>(&'a NodeInfo);

impl<'a> Node<'a> {
    /// Returns the endpoint of an established connection to the peer.
    pub fn endpoint(&self) -> &'a ConnectedPoint {
        &self.0.endpoints[0] // `endpoints` are non-empty by definition
    }

The comment above said: endpoints are non-empty by definition but it will trigger an exception when accessing if no item was pushed.

Expected behavior:

Steps to reproduce:

Related code:

insert short code snippets here

Other information: