liminal-server 0.25.4

Standalone server for the liminal messaging bus
Documentation 
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//! Carrier ends and repeated owners preserve the first counted cause.

use super::{LinkLife, LinkRegistry};
use crate::link::LinkEnd;
use crate::link_carrier::{CarrierError, CarrierReceive, LinkCarrier, WireCarrier, write_frame};
use crate::link_handshake::MachineIdentity;
use liminal::protocol::{DisconnectReason, Frame, ProtocolVersion};
use std::net::{TcpListener, TcpStream};

#[test]
fn an_idle_dialed_carrier_reports_eof_without_a_receive_call() -> TestResult {
    let (carrier, peer, life) = pair()?;
    let (sender, receiver) = std::sync::mpsc::channel();
    life.observe(
        "local".to_owned(),
        std::sync::Arc::new(move |change| {
            if matches!(
                change,
                crate::console::TopologyChange::Link {
                    state: crate::console::records::LinkState::Down,
                    ..
                }
            ) && let Err(error) = sender.send(())
            {
                eprintln!("idle carrier observer departed: {error}");
            }
        }),
    )?;
    drop(peer);
    let observed = receiver.recv_timeout(std::time::Duration::from_secs(5));
    assert!(
        observed.is_ok(),
        "idle EOF did not end the keyed carrier: {observed:?}"
    );
    assert_eq!(life.reason()?, Some("peer_gone".to_owned()));
    assert_eq!(life.snapshot().links_closed_by_peer_gone, 1);
    drop(carrier);
    assert_eq!(life.snapshot().links_closed_by_shutdown, 0);
    Ok(())
}

type TestResult = Result<(), Box<dyn std::error::Error>>;

fn pair() -> Result<(WireCarrier, TcpStream, LinkLife), Box<dyn std::error::Error>> {
    let listener = TcpListener::bind("127.0.0.1:0")?;
    let socket = TcpStream::connect(listener.local_addr()?)?;
    let (peer, _) = listener.accept()?;
    let life = LinkLife::new(MachineIdentity::new([7; 32]));
    let mut carrier = WireCarrier::new(socket, 1)?;
    carrier.install_life(life.clone())?;
    Ok((carrier, peer, life))
}

#[test]
fn every_cause_counts_once_across_repeated_owners_and_peer_opens() -> TestResult {
    let registry = LinkRegistry::default();
    let peer = MachineIdentity::new([7; 32]);
    let reasons = [
        LinkEnd::PeerGone,
        LinkEnd::Revoked,
        LinkEnd::Refused("denied".to_owned()),
        LinkEnd::Replaced,
        LinkEnd::Shutdown,
    ];
    let mut links = Vec::new();
    for reason in reasons {
        let life = registry.opened(peer)?;
        life.end(reason.clone())?;
        life.clone().end(LinkEnd::Shutdown)?;
        assert_eq!(life.reason()?, Some(reason.to_string()));
        links.push(life);
    }
    let counts = links[0].snapshot();
    assert_eq!(counts.links_opened, 5);
    assert_eq!(counts.links_closed_by_peer_gone, 1);
    assert_eq!(counts.links_closed_by_revoked, 1);
    assert_eq!(counts.links_closed_by_refused, 1);
    assert_eq!(counts.links_closed_by_replaced, 1);
    assert_eq!(counts.links_closed_by_shutdown, 1);
    Ok(())
}

#[test]
fn dialed_carrier_eof_keeps_peer_gone_after_drop() -> TestResult {
    let (mut carrier, peer, life) = pair()?;
    drop(peer);
    assert_eq!(
        carrier.receive()?,
        CarrierReceive::End {
            reason: "wire_eof".to_owned()
        }
    );
    drop(carrier);
    assert_eq!(life.reason()?, Some("peer_gone".to_owned()));
    assert_eq!(life.snapshot().links_closed_by_peer_gone, 1);
    assert_eq!(life.snapshot().links_closed_by_shutdown, 0);
    Ok(())
}

#[test]
fn dialed_carrier_revocation_keeps_revoked_after_drop() -> TestResult {
    let (mut carrier, mut peer, life) = pair()?;
    write_frame(
        &mut peer,
        &Frame::DisconnectReason {
            flags: 0,
            reason: DisconnectReason::GrantRevoked,
        },
    )?;
    assert_eq!(
        carrier.receive()?,
        CarrierReceive::End {
            reason: "grant_revoked".to_owned()
        }
    );
    drop(carrier);
    assert_eq!(life.reason()?, Some("revoked".to_owned()));
    assert_eq!(life.snapshot().links_closed_by_revoked, 1);
    assert_eq!(life.snapshot().links_closed_by_shutdown, 0);
    Ok(())
}

#[test]
fn an_unexpected_carrier_frame_ends_by_refusal_once() -> TestResult {
    let (mut carrier, mut peer, life) = pair()?;
    write_frame(
        &mut peer,
        &Frame::ConnectAck {
            flags: 0,
            selected_version: ProtocolVersion::new(1, 3),
            capabilities: 0,
        },
    )?;
    assert!(matches!(
        carrier.receive(),
        Err(CarrierError::UnexpectedFrame)
    ));
    drop(carrier);
    assert_eq!(
        life.reason()?,
        Some("refused: unexpected frame on wire link".to_owned())
    );
    assert_eq!(life.snapshot().links_closed_by_refused, 1);
    assert_eq!(life.snapshot().links_closed_by_shutdown, 0);
    Ok(())
}