Allow peers to reconnect

crates/librqbit/src/torrent_state/live/mod.rs

@@ -382,7 +382,17 @@ impl TorrentStateLive {
         let (tx, rx) = unbounded_channel();
 
         let counters = match self.peers.states.entry(checked_peer.addr) {
-            Entry::Occupied(_) => bail!("we are already managing peer {}", checked_peer.addr),
+            Entry::Occupied(mut occ) => {
+                let peer = occ.get_mut();
+                peer.state
+                    .incoming_connection(
+                        Id20(checked_peer.handshake.peer_id),
+                        tx.clone(),
+                        &self.peers.stats,
+                    )
+                    .context("peer already existed")?;
+                peer.stats.counters.clone()
+            }
             Entry::Vacant(vac) => {
                 let peer = Peer::new_live_for_incoming_connection(
                     Id20(checked_peer.handshake.peer_id),
@@ -394,6 +404,9 @@ impl TorrentStateLive {
                 counters
             }
         };
+        counters
+            .incoming_connections
+            .fetch_add(1, Ordering::Relaxed);
 
         self.spawn(
             "incoming peer",
@@ -504,7 +517,7 @@ impl TorrentStateLive {
 
         handler
             .counters
-            .connection_attempts
+            .outgoing_connection_attempts
             .fetch_add(1, Ordering::Relaxed);
         let res = tokio::select! {
             r = requester => {r}
@@ -803,7 +816,9 @@ struct PeerHandler {
 
 impl<'a> PeerConnectionHandler for &'a PeerHandler {
     fn on_connected(&self, connection_time: Duration) {
-        self.counters.connections.fetch_add(1, Ordering::Relaxed);
+        self.counters
+            .outgoing_connections
+            .fetch_add(1, Ordering::Relaxed);
         self.counters
             .total_time_connecting_ms
             .fetch_add(connection_time.as_millis() as u64, Ordering::Relaxed);

crates/librqbit/src/torrent_state/live/peer/mod.rs

@@ -135,6 +135,25 @@ impl PeerStateNoMut {
             None
         }
     }
+
+    pub fn incoming_connection(
+        &mut self,
+        peer_id: Id20,
+        tx: PeerTx,
+        counters: &AggregatePeerStatsAtomic,
+    ) -> anyhow::Result<()> {
+        if matches!(&self.0, PeerState::Connecting(..) | PeerState::Live(..)) {
+            anyhow::bail!("peer already active");
+        }
+        match self.take(counters) {
+            PeerState::Queued | PeerState::Dead | PeerState::NotNeeded => {
+                self.set(PeerState::Live(LivePeerState::new(peer_id, tx)), counters);
+            }
+            PeerState::Connecting(..) | PeerState::Live(..) => unreachable!(),
+        }
+        Ok(())
+    }
+
     pub fn connecting_to_live(
         &mut self,
         peer_id: Id20,

crates/librqbit/src/torrent_state/live/peer/stats/atomic.rs

@@ -12,8 +12,9 @@ use backoff::{ExponentialBackoff, ExponentialBackoffBuilder};
 pub(crate) struct PeerCountersAtomic {
     pub fetched_bytes: AtomicU64,
     pub total_time_connecting_ms: AtomicU64,
-    pub connection_attempts: AtomicU32,
+    pub incoming_connections: AtomicU32,
-    pub connections: AtomicU32,
+    pub outgoing_connection_attempts: AtomicU32,
+    pub outgoing_connections: AtomicU32,
     pub errors: AtomicU32,
     pub fetched_chunks: AtomicU32,
     pub downloaded_and_checked_pieces: AtomicU32,

crates/librqbit/src/torrent_state/live/peer/stats/snapshot.rs

@@ -6,6 +6,7 @@ use crate::torrent_state::live::peer::{Peer, PeerState};
 
 #[derive(Serialize, Deserialize)]
 pub struct PeerCounters {
+    pub incoming_connections: u32,
     pub fetched_bytes: u64,
     pub total_time_connecting_ms: u64,
     pub connection_attempts: u32,
@@ -24,10 +25,13 @@ pub struct PeerStats {
 impl From<&super::atomic::PeerCountersAtomic> for PeerCounters {
     fn from(counters: &super::atomic::PeerCountersAtomic) -> Self {
         Self {
+            incoming_connections: counters.incoming_connections.load(Ordering::Relaxed),
             fetched_bytes: counters.fetched_bytes.load(Ordering::Relaxed),
             total_time_connecting_ms: counters.total_time_connecting_ms.load(Ordering::Relaxed),
-            connection_attempts: counters.connection_attempts.load(Ordering::Relaxed),
+            connection_attempts: counters
-            connections: counters.connections.load(Ordering::Relaxed),
+                .outgoing_connection_attempts
+                .load(Ordering::Relaxed),
+            connections: counters.outgoing_connections.load(Ordering::Relaxed),
             errors: counters.errors.load(Ordering::Relaxed),
             fetched_chunks: counters.fetched_chunks.load(Ordering::Relaxed),
             downloaded_and_checked_pieces: counters

crates/rqbit/src/main.rs

@@ -428,7 +428,7 @@ async fn async_main(opts: Opts) -> anyhow::Result<()> {
                 http_api
                     .make_http_api_and_run(http_api_listen_addr, false)
                     .await
-                    .context("error starting HTTP API")
+                    .context("error running HTTP API")
             }
         },
         SubCommand::Download(download_opts) => {