Struct Conn 

pub struct Conn {
    pub reader: Box<dyn Read + Send>,
    pub writer: Box<dyn Write + Send>,
    pub peer_closed: Arc<dyn Fn() -> bool + Send + Sync>,
    pub shutdown: Arc<dyn Fn() + Send + Sync>,
    pub peer: PeerIdentity,
}

An accepted or connected duplex stream. peer is who the OS reports on the other end.

Fields

reader: Box<dyn Read + Send>

writer: Box<dyn Write + Send>

peer_closed: Arc<dyn Fn() -> bool + Send + Sync>

Non-blocking: has the peer closed its end? Safe to call from another thread.

shutdown: Arc<dyn Fn() + Send + Sync>

peer: PeerIdentity

Who the OS says is on the other end. Filled in for an accepted connection, where the peer check has just run; empty for a connection this process opened.