iroh-http-core 0.4.0

//! Observability and peer-info methods on [`super::IrohEndpoint`].
//!
//! Split from `mod.rs` so the facade file stays ≤ 200 LoC. These methods
//! are read-only and have no lifecycle side effects.

use std::sync::atomic::Ordering;

use iroh::endpoint::TransportAddrUsage;

use super::{
    stats::{EndpointStats, NodeAddrInfo, PathInfo, PeerStats},
    IrohEndpoint,
};

impl IrohEndpoint {
    /// Snapshot of current endpoint statistics.
    ///
    /// All fields are point-in-time reads and may change between calls.
    pub fn endpoint_stats(&self) -> EndpointStats {
        let (active_readers, active_writers, active_sessions, total_handles) =
            self.inner.ffi.handles.count_handles();
        let pool_size = self.inner.http.pool.entry_count_approx() as usize;
        let active_connections = self.inner.http.active_connections.load(Ordering::Relaxed);
        let active_requests = self.inner.http.active_requests.load(Ordering::Relaxed);
        EndpointStats {
            active_readers,
            active_writers,
            active_sessions,
            total_handles,
            pool_size,
            active_connections,
            active_requests,
        }
    }

    /// Returns the local socket addresses this endpoint is bound to.
    pub fn bound_sockets(&self) -> Vec<std::net::SocketAddr> {
        self.inner.transport.ep.bound_sockets()
    }

    /// Full node address: node ID + relay URL(s) + direct socket addresses.
    pub fn node_addr(&self) -> NodeAddrInfo {
        let addr = self.inner.transport.ep.addr();
        let mut addrs = Vec::new();
        for relay in addr.relay_urls() {
            addrs.push(relay.to_string());
        }
        for da in addr.ip_addrs() {
            addrs.push(da.to_string());
        }
        NodeAddrInfo {
            id: self.inner.transport.node_id_str.clone(),
            addrs,
        }
    }

    /// Home relay URL, or `None` if not connected to a relay.
    pub fn home_relay(&self) -> Option<String> {
        self.inner
            .transport
            .ep
            .addr()
            .relay_urls()
            .next()
            .map(|u| u.to_string())
    }

    /// Known addresses for a remote peer, or `None` if not in the endpoint's cache.
    pub async fn peer_info(&self, node_id_b32: &str) -> Option<NodeAddrInfo> {
        let bytes = crate::base32_decode(node_id_b32).ok()?;
        let arr: [u8; 32] = bytes.try_into().ok()?;
        let pk = iroh::PublicKey::from_bytes(&arr).ok()?;
        let info = self.inner.transport.ep.remote_info(pk).await?;
        let id = crate::base32_encode(info.id().as_bytes());
        let mut addrs = Vec::new();
        for a in info.addrs() {
            match a.addr() {
                iroh::TransportAddr::Ip(sock) => addrs.push(sock.to_string()),
                iroh::TransportAddr::Relay(url) => addrs.push(url.to_string()),
                other => addrs.push(format!("{:?}", other)),
            }
        }
        Some(NodeAddrInfo { id, addrs })
    }

    /// Per-peer connection statistics.
    ///
    /// Returns path information for each known transport address, including
    /// whether each path is via a relay or direct, and which is active.
    pub async fn peer_stats(&self, node_id_b32: &str) -> Option<PeerStats> {
        let bytes = crate::base32_decode(node_id_b32).ok()?;
        let arr: [u8; 32] = bytes.try_into().ok()?;
        let pk = iroh::PublicKey::from_bytes(&arr).ok()?;
        let info = self.inner.transport.ep.remote_info(pk).await?;

        let mut paths = Vec::new();
        let mut has_active_relay = false;
        let mut active_relay_url: Option<String> = None;

        for a in info.addrs() {
            let is_relay = a.addr().is_relay();
            let is_active = matches!(a.usage(), TransportAddrUsage::Active);

            let addr_str = match a.addr() {
                iroh::TransportAddr::Ip(sock) => sock.to_string(),
                iroh::TransportAddr::Relay(url) => {
                    if is_active {
                        has_active_relay = true;
                        active_relay_url = Some(url.to_string());
                    }
                    url.to_string()
                }
                other => format!("{:?}", other),
            };

            paths.push(PathInfo {
                relay: is_relay,
                addr: addr_str,
                active: is_active,
            });
        }

        // Enrich with QUIC connection-level stats if a pooled connection exists.
        let (rtt_ms, bytes_sent, bytes_received, lost_packets, sent_packets, congestion_window) =
            if let Some(pooled) = self.inner.http.pool.get_existing(pk, crate::ALPN).await {
                let s = pooled.conn.stats();
                let rtt = pooled.conn.rtt(iroh::endpoint::PathId::ZERO);
                (
                    rtt.map(|d| d.as_secs_f64() * 1000.0),
                    Some(s.udp_tx.bytes),
                    Some(s.udp_rx.bytes),
                    None,
                    None,
                    None,
                )
            } else {
                (None, None, None, None, None, None)
            };

        Some(PeerStats {
            relay: has_active_relay,
            relay_url: active_relay_url,
            paths,
            rtt_ms,
            bytes_sent,
            bytes_received,
            lost_packets,
            sent_packets,
            congestion_window,
        })
    }

    /// Subscribe to path changes for a specific peer.
    ///
    /// Spawns a background watcher task the first time a given peer is subscribed.
    /// The watcher polls `peer_stats()` every 200 ms and emits on the returned
    /// channel whenever the active path changes.
    pub fn subscribe_path_changes(
        &self,
        node_id_str: &str,
    ) -> tokio::sync::mpsc::UnboundedReceiver<PathInfo> {
        let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
        // Replace any existing sender; old watcher exits when it detects is_closed().
        self.inner
            .session
            .path_subs
            .insert(node_id_str.to_string(), tx);

        let ep = self.clone();
        let nid = node_id_str.to_string();
        let event_tx = self.inner.session.event_tx.clone();

        tokio::spawn(async move {
            let mut last_key: Option<String> = None;
            let mut closed_rx = ep.inner.session.closed_rx.clone();
            loop {
                // Exit immediately if the endpoint has been closed.
                if *closed_rx.borrow() {
                    ep.inner.session.path_subs.remove(&nid);
                    break;
                }
                let is_closed = ep
                    .inner
                    .session
                    .path_subs
                    .get(&nid)
                    .map(|s| s.is_closed())
                    .unwrap_or(true);
                if is_closed {
                    ep.inner.session.path_subs.remove(&nid);
                    break;
                }

                if let Some(stats) = ep.peer_stats(&nid).await {
                    if let Some(active) = stats.paths.iter().find(|p| p.active) {
                        let key = format!("{}:{}", active.relay, active.addr);
                        if Some(&key) != last_key.as_ref() {
                            last_key = Some(key);
                            if let Some(sender) = ep.inner.session.path_subs.get(&nid) {
                                let _ = sender.send(active.clone());
                            }
                            let _ = event_tx.try_send(
                                crate::http::events::TransportEvent::path_change(
                                    &nid,
                                    &active.addr,
                                    active.relay,
                                ),
                            );
                        }
                    }
                }

                // Sleep 200 ms, but wake early if the endpoint is being closed.
                tokio::select! {
                    _ = tokio::time::sleep(std::time::Duration::from_millis(200)) => {}
                    result = closed_rx.wait_for(|v| *v) => {
                        let _ = result;
                        ep.inner.session.path_subs.remove(&nid);
                        break;
                    }
                }
            }
        });

        rx
    }
}