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swarm: replace manual Stream impl with async_stream select loop (#1597 )
The Swarm's manual `impl Stream` had a fairness issue: it drained all client commands before polling the inner libp2p swarm, which could theoretically starve network event delivery under heavy command load. Replaced the hand-rolled `poll_next` with `tokio::select!` inside an `async_stream::stream!` generator. This gives fair, randomized polling between the client command channel and the inner swarm. Extracted `on_message` and `filter_swarm_event` as free functions, removed `pin_project` dependency, and changed callers to use `.into_stream()`. Test plan: - CI
2026-02-24 10:18:12 -05:00 · 2026-02-24 12:00:19 +00:00 · 2026-02-23 17:48:55 +00:00 · 2026-02-23 16:39:11 +00:00
14 changed files with 388 additions and 572 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -216,6 +216,28 @@ dependencies = [
 "windows-sys 0.61.2",
 ]

+[[package]]
+name = "async-stream"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5a71a6f37880a80d1d7f19efd781e4b5de42c88f0722cc13bcb6cc2cfe8476"
+dependencies = [
+ "async-stream-impl",
+ "futures-core",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "async-stream-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7c24de15d275a1ecfd47a380fb4d5ec9bfe0933f309ed5e705b775596a3574d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.111",
+]
+
 [[package]]
 name = "async-trait"
 version = "0.1.89"
@@ -2759,6 +2781,7 @@ dependencies = [
 name = "networking"
 version = "0.0.1"
 dependencies = [
+ "async-stream",
 "delegate",
 "either",
 "extend",
@@ -2767,6 +2790,7 @@ dependencies = [
 "keccak-const",
 "libp2p",
 "log",
+ "pin-project",
 "tokio",
 "tracing-subscriber",
 "util",
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -34,6 +34,7 @@ delegate = "0.13"
 keccak-const = "0.2"

 # Async dependencies
+async-stream = "0.3"
 tokio = "1.46"
 futures-lite = "2.6.1"
 futures-timer = "3.0"
--- a/nix/mlx.nix
+++ b/nix/mlx.nix
@@ -41,7 +41,7 @@ let

  mlx = stdenv.mkDerivation rec {
    pname = "mlx";
-    version = let v = "0.30.7.dev20260220+13998a05"; in
+    version = let v = "0.30.7.dev20260224+13998a05"; in
      assert v == uvLockMlxVersion || throw "MLX version mismatch: nix/mlx.nix has ${v} but uv.lock has ${uvLockMlxVersion}. Update both the version and hash in nix/mlx.nix.";
      v;
    pyproject = true;
--- a/rust/exo_pyo3_bindings/exo_pyo3_bindings.pyi
+++ b/rust/exo_pyo3_bindings/exo_pyo3_bindings.pyi
@@ -2,7 +2,6 @@
 # ruff: noqa: E501, F401

 import builtins
-import enum
 import typing

@typing.final
@@ -11,29 +10,6 @@ class AllQueuesFullError(builtins.Exception):
    def __repr__(self) -> builtins.str: ...
    def __str__(self) -> builtins.str: ...

-@typing.final
-class ConnectionUpdate:
-    @property
-    def update_type(self) -> ConnectionUpdateType:
-        r"""
-        Whether this is a connection or disconnection event
-        """
-    @property
-    def peer_id(self) -> builtins.str:
-        r"""
-        Identity of the peer that we have connected to or disconnected from.
-        """
-    @property
-    def remote_ipv4(self) -> builtins.str:
-        r"""
-        Remote connection's IPv4 address.
-        """
-    @property
-    def remote_tcp_port(self) -> builtins.int:
-        r"""
-        Remote connection's TCP port.
-        """
-
@typing.final
 class Keypair:
    r"""
@@ -61,18 +37,6 @@ class Keypair:
@typing.final
 class NetworkingHandle:
    def __new__(cls, identity: Keypair) -> NetworkingHandle: ...
-    async def connection_update_recv(self) -> ConnectionUpdate:
-        r"""
-        Receives the next `ConnectionUpdate` from networking.
-        """
-    async def connection_update_recv_many(self, limit: builtins.int) -> builtins.list[ConnectionUpdate]:
-        r"""
-        Receives at most `limit` `ConnectionUpdate`s from networking and returns them.
-        
-        For `limit = 0`, an empty collection of `ConnectionUpdate`s will be returned immediately.
-        For `limit > 0`, if there are no `ConnectionUpdate`s in the channel's queue this method
-        will sleep until a `ConnectionUpdate`s is sent.
-        """
    async def gossipsub_subscribe(self, topic: builtins.str) -> builtins.bool:
        r"""
        Subscribe to a `GossipSub` topic.
@@ -91,18 +55,7 @@ class NetworkingHandle:
        
        If no peers are found that subscribe to this topic, throws `NoPeersSubscribedToTopicError` exception.
        """
-    async def gossipsub_recv(self) -> tuple[builtins.str, bytes]:
-        r"""
-        Receives the next message from the `GossipSub` network.
-        """
-    async def gossipsub_recv_many(self, limit: builtins.int) -> builtins.list[tuple[builtins.str, bytes]]:
-        r"""
-        Receives at most `limit` messages from the `GossipSub` network and returns them.
-        
-        For `limit = 0`, an empty collection of messages will be returned immediately.
-        For `limit > 0`, if there are no messages in the channel's queue this method
-        will sleep until a message is sent.
-        """
+    async def recv(self) -> PyFromSwarm: ...

@typing.final
 class MessageTooLargeError(builtins.Exception):
@@ -116,11 +69,26 @@ class NoPeersSubscribedToTopicError(builtins.Exception):
    def __repr__(self) -> builtins.str: ...
    def __str__(self) -> builtins.str: ...

-@typing.final
-class ConnectionUpdateType(enum.Enum):
-    r"""
-    Connection or disconnection event discriminant type.
-    """
-    Connected = ...
-    Disconnected = ...
+class PyFromSwarm:
+    @typing.final
+    class Connection(PyFromSwarm):
+        __match_args__ = ("peer_id", "connected",)
+        @property
+        def peer_id(self) -> builtins.str: ...
+        @property
+        def connected(self) -> builtins.bool: ...
+        def __new__(cls, peer_id: builtins.str, connected: builtins.bool) -> PyFromSwarm.Connection: ...
+    
+    @typing.final
+    class Message(PyFromSwarm):
+        __match_args__ = ("origin", "topic", "data",)
+        @property
+        def origin(self) -> builtins.str: ...
+        @property
+        def topic(self) -> builtins.str: ...
+        @property
+        def data(self) -> bytes: ...
+        def __new__(cls, origin: builtins.str, topic: builtins.str, data: bytes) -> PyFromSwarm.Message: ...
+    
+    ...

--- a/rust/exo_pyo3_bindings/pyproject.toml
+++ b/rust/exo_pyo3_bindings/pyproject.toml
@@ -4,11 +4,12 @@ build-backend = "maturin"

 [project]
 name = "exo_pyo3_bindings"
-version = "0.1.0"
+version = "0.2.0"
 description = "Add your description here"
 readme = "README.md"
 authors = [
-    { name = "Andrei Cravtov", email = "the.andrei.cravtov@gmail.com" }
+    { name = "Andrei Cravtov", email = "the.andrei.cravtov@gmail.com" },
+    { name = "Evan Quiney", email = "evanev7@gmail.com" }
 ]
 requires-python = ">=3.13"
 dependencies = []
--- a/rust/exo_pyo3_bindings/src/lib.rs
+++ b/rust/exo_pyo3_bindings/src/lib.rs
@@ -155,6 +155,9 @@ pub(crate) mod ext {
 fn main_module(m: &Bound<'_, PyModule>) -> PyResult<()> {
    // install logger
    pyo3_log::init();
+    let mut builder = tokio::runtime::Builder::new_multi_thread();
+    builder.enable_all();
+    pyo3_async_runtimes::tokio::init(builder);

    // TODO: for now this is all NOT a submodule, but figure out how to make the submodule system
    //       work with maturin, where the types generate correctly, in the right folder, without
--- a/rust/exo_pyo3_bindings/src/networking.rs
+++ b/rust/exo_pyo3_bindings/src/networking.rs
@@ -1,26 +1,24 @@
-#![allow(
-    clippy::multiple_inherent_impl,
-    clippy::unnecessary_wraps,
-    clippy::unused_self,
-    clippy::needless_pass_by_value
-)]
+use std::pin::Pin;
+use std::sync::Arc;

 use crate::r#const::MPSC_CHANNEL_SIZE;
 use crate::ext::{ByteArrayExt as _, FutureExt, PyErrExt as _};
-use crate::ext::{ResultExt as _, TokioMpscReceiverExt as _, TokioMpscSenderExt as _};
+use crate::ext::{ResultExt as _, TokioMpscSenderExt as _};
 use crate::ident::PyKeypair;
+use crate::networking::exception::{
+    PyAllQueuesFullError, PyMessageTooLargeError, PyNoPeersSubscribedToTopicError,
+};
 use crate::pyclass;
-use libp2p::futures::StreamExt as _;
-use libp2p::gossipsub;
-use libp2p::gossipsub::{IdentTopic, Message, MessageId, PublishError};
-use libp2p::swarm::SwarmEvent;
-use networking::discovery;
-use networking::swarm::create_swarm;
+use futures_lite::{Stream, StreamExt as _};
+use libp2p::gossipsub::PublishError;
+use networking::swarm::{FromSwarm, ToSwarm, create_swarm};
+use pyo3::exceptions::PyRuntimeError;
 use pyo3::prelude::{PyModule, PyModuleMethods as _};
 use pyo3::types::PyBytes;
-use pyo3::{Bound, Py, PyErr, PyResult, PyTraverseError, PyVisit, Python, pymethods};
-use pyo3_stub_gen::derive::{gen_stub_pyclass, gen_stub_pyclass_enum, gen_stub_pymethods};
-use std::net::IpAddr;
+use pyo3::{Bound, Py, PyAny, PyErr, PyResult, Python, pymethods};
+use pyo3_stub_gen::derive::{
+    gen_methods_from_python, gen_stub_pyclass, gen_stub_pyclass_complex_enum, gen_stub_pymethods,
+};
 use tokio::sync::{Mutex, mpsc, oneshot};

 mod exception {
@@ -131,237 +129,45 @@ mod exception {
    }
 }

-/// Connection or disconnection event discriminant type.
-#[gen_stub_pyclass_enum]
-#[pyclass(eq, eq_int, name = "ConnectionUpdateType")]
-#[derive(Debug, Clone, PartialEq)]
-enum PyConnectionUpdateType {
-    Connected = 0,
-    Disconnected,
-}
-
-#[gen_stub_pyclass]
-#[pyclass(frozen, name = "ConnectionUpdate")]
-#[derive(Debug, Clone)]
-struct PyConnectionUpdate {
-    /// Whether this is a connection or disconnection event
-    #[pyo3(get)]
-    update_type: PyConnectionUpdateType,
-
-    /// Identity of the peer that we have connected to or disconnected from.
-    #[pyo3(get)]
-    peer_id: String,
-
-    /// Remote connection's IPv4 address.
-    #[pyo3(get)]
-    remote_ipv4: String,
-
-    /// Remote connection's TCP port.
-    #[pyo3(get)]
-    remote_tcp_port: u16,
-}
-
-enum ToTask {
-    GossipsubSubscribe {
-        topic: String,
-        result_tx: oneshot::Sender<PyResult<bool>>,
-    },
-    GossipsubUnsubscribe {
-        topic: String,
-        result_tx: oneshot::Sender<bool>,
-    },
-    GossipsubPublish {
-        topic: String,
-        data: Vec<u8>,
-        result_tx: oneshot::Sender<PyResult<MessageId>>,
-    },
-}
-
-#[allow(clippy::enum_glob_use)]
-async fn networking_task(
-    mut swarm: networking::swarm::Swarm,
-    mut to_task_rx: mpsc::Receiver<ToTask>,
-    connection_update_tx: mpsc::Sender<PyConnectionUpdate>,
-    gossipsub_message_tx: mpsc::Sender<(String, Vec<u8>)>,
-) {
-    use SwarmEvent::*;
-    use ToTask::*;
-    use networking::swarm::BehaviourEvent::*;
-
-    log::info!("RUST: networking task started");
-
-    loop {
-        tokio::select! {
-            message = to_task_rx.recv() => {
-                // handle closed channel
-                let Some(message) = message else {
-                    log::info!("RUST: channel closed");
-                    break;
-                };
-
-                // dispatch incoming messages
-                match message {
-                    GossipsubSubscribe { topic, result_tx } => {
-                        // try to subscribe
-                        let result = swarm.behaviour_mut()
-                            .gossipsub.subscribe(&IdentTopic::new(topic));
-
-                        // send response oneshot
-                        if let Err(e) = result_tx.send(result.pyerr()) {
-                            log::error!("RUST: could not subscribe to gossipsub topic since channel already closed: {e:?}");
-                            continue;
-                        }
-                    }
-                    GossipsubUnsubscribe { topic, result_tx } => {
-                        // try to unsubscribe from the topic
-                        let result = swarm.behaviour_mut()
-                            .gossipsub.unsubscribe(&IdentTopic::new(topic));
-
-                        // send response oneshot (or exit if connection closed)
-                        if let Err(e) = result_tx.send(result) {
-                            log::error!("RUST: could not unsubscribe from gossipsub topic since channel already closed: {e:?}");
-                            continue;
-                        }
-                    }
-                    GossipsubPublish { topic, data, result_tx } => {
-                        // try to publish the data -> catch NoPeersSubscribedToTopic error & convert to correct exception
-                        let result = swarm.behaviour_mut().gossipsub.publish(
-                            IdentTopic::new(topic), data);
-                        let pyresult: PyResult<MessageId> = if let Err(PublishError::NoPeersSubscribedToTopic) = result {
-                            Err(exception::PyNoPeersSubscribedToTopicError::new_err())
-                        } else if let Err(PublishError::AllQueuesFull(_)) = result {
-                            Err(exception::PyAllQueuesFullError::new_err())
-                        } else if let Err(PublishError::MessageTooLarge) = result {
-                            Err(exception::PyMessageTooLargeError::new_err())
-                        } else {
-                            result.pyerr()
-                        };
-
-                        // send response oneshot (or exit if connection closed)
-                        if let Err(e) = result_tx.send(pyresult) {
-                            log::error!("RUST: could not publish gossipsub message since channel already closed: {e:?}");
-                            continue;
-                        }
-                    }
-                }
-            }
-
-            // architectural solution to this problem:
-            // create keep_alive behavior who's job it is to dial peers discovered by mDNS (and drop when expired)
-            //   -> it will emmit TRUE connected/disconnected events consumable elsewhere
-            //
-            // gossipsub will feed off-of dial attempts created by networking, and that will bootstrap its' peers list
-            // then for actual communication it will dial those peers if need-be
-            swarm_event = swarm.select_next_some() => {
-                match swarm_event {
-                    Behaviour(Gossipsub(gossipsub::Event::Message {
-                        message: Message {
-                            topic,
-                            data,
-                            ..
-                        },
-                        ..
-                    })) => {
-                        // topic-ID is just the topic hash!!! (since we used identity hasher)
-                        let message = (topic.into_string(), data);
-
-                        // send incoming message to channel (or exit if connection closed)
-                        if let Err(e) = gossipsub_message_tx.send(message).await {
-                            log::error!("RUST: could not send incoming gossipsub message since channel already closed: {e}");
-                            continue;
-                        }
-                    },
-                    Behaviour(Discovery(discovery::Event::ConnectionEstablished { peer_id, remote_ip, remote_tcp_port, .. })) => {
-                        // grab IPv4 string
-                        let remote_ipv4 = match remote_ip {
-                            IpAddr::V4(ip) => ip.to_string(),
-                            IpAddr::V6(ip) => {
-                                log::warn!("RUST: ignoring connection to IPv6 address: {ip}");
-                                continue;
-                            }
-                        };
-
-                        // send connection event to channel (or exit if connection closed)
-                        if let Err(e) = connection_update_tx.send(PyConnectionUpdate {
-                            update_type: PyConnectionUpdateType::Connected,
-                            peer_id: peer_id.to_base58(),
-                            remote_ipv4,
-                            remote_tcp_port,
-                        }).await {
-                            log::error!("RUST: could not send connection update since channel already closed: {e}");
-                            continue;
-                        }
-                    },
-                    Behaviour(Discovery(discovery::Event::ConnectionClosed { peer_id, remote_ip, remote_tcp_port, .. })) => {
-                        // grab IPv4 string
-                        let remote_ipv4 = match remote_ip {
-                            IpAddr::V4(ip) => ip.to_string(),
-                            IpAddr::V6(ip) => {
-                                log::warn!("RUST: ignoring disconnection from IPv6 address: {ip}");
-                                continue;
-                            }
-                        };
-
-                        // send disconnection event to channel (or exit if connection closed)
-                        if let Err(e) = connection_update_tx.send(PyConnectionUpdate {
-                            update_type: PyConnectionUpdateType::Disconnected,
-                            peer_id: peer_id.to_base58(),
-                            remote_ipv4,
-                            remote_tcp_port,
-                        }).await {
-                            log::error!("RUST: could not send connection update since channel already closed: {e}");
-                            continue;
-                        }
-                    },
-                    e => {
-                        log::info!("RUST: other event {e:?}");
-                    }
-                }
-            }
-        }
-    }
-
-    log::info!("RUST: networking task stopped");
-}
-
 #[gen_stub_pyclass]
 #[pyclass(name = "NetworkingHandle")]
-#[derive(Debug)]
 struct PyNetworkingHandle {
    // channels
-    to_task_tx: Option<mpsc::Sender<ToTask>>,
-    connection_update_rx: Mutex<mpsc::Receiver<PyConnectionUpdate>>,
-    gossipsub_message_rx: Mutex<mpsc::Receiver<(String, Vec<u8>)>>,
+    pub to_swarm: mpsc::Sender<ToSwarm>,
+    pub swarm: Arc<Mutex<Pin<Box<dyn Stream<Item = FromSwarm> + Send>>>>,
 }

-impl Drop for PyNetworkingHandle {
-    fn drop(&mut self) {
-        // TODO: may or may not need to await a "kill-signal" oneshot channel message,
-        //       to ensure that the networking task is done BEFORE exiting the clear function...
-        //       but this may require GIL?? and it may not be safe to call GIL here??
-        self.to_task_tx = None; // Using Option<T> as a trick to force channel to be dropped
-    }
+#[gen_stub_pyclass_complex_enum]
+#[pyclass]
+enum PyFromSwarm {
+    Connection {
+        peer_id: String,
+        connected: bool,
+    },
+    Message {
+        origin: String,
+        topic: String,
+        data: Py<PyBytes>,
+    },
 }
-
-#[allow(clippy::expect_used)]
-impl PyNetworkingHandle {
-    fn new(
-        to_task_tx: mpsc::Sender<ToTask>,
-        connection_update_rx: mpsc::Receiver<PyConnectionUpdate>,
-        gossipsub_message_rx: mpsc::Receiver<(String, Vec<u8>)>,
-    ) -> Self {
-        Self {
-            to_task_tx: Some(to_task_tx),
-            connection_update_rx: Mutex::new(connection_update_rx),
-            gossipsub_message_rx: Mutex::new(gossipsub_message_rx),
+impl From<FromSwarm> for PyFromSwarm {
+    fn from(value: FromSwarm) -> Self {
+        match value {
+            FromSwarm::Discovered { peer_id } => Self::Connection {
+                peer_id: peer_id.to_base58(),
+                connected: true,
+            },
+            FromSwarm::Expired { peer_id } => Self::Connection {
+                peer_id: peer_id.to_base58(),
+                connected: false,
+            },
+            FromSwarm::Message { from, topic, data } => Self::Message {
+                origin: from.to_base58(),
+                topic: topic,
+                data: data.pybytes(),
+            },
        }
    }
-
-    const fn to_task_tx(&self) -> &mpsc::Sender<ToTask> {
-        self.to_task_tx
-            .as_ref()
-            .expect("The sender should only be None after de-initialization.")
-    }
 }

 #[gen_stub_pymethods]
@@ -375,97 +181,36 @@ impl PyNetworkingHandle {

    #[new]
    fn py_new(identity: Bound<'_, PyKeypair>) -> PyResult<Self> {
-        use pyo3_async_runtimes::tokio::get_runtime;
-
        // create communication channels
-        let (to_task_tx, to_task_rx) = mpsc::channel(MPSC_CHANNEL_SIZE);
-        let (connection_update_tx, connection_update_rx) = mpsc::channel(MPSC_CHANNEL_SIZE);
-        let (gossipsub_message_tx, gossipsub_message_rx) = mpsc::channel(MPSC_CHANNEL_SIZE);
+        let (to_swarm, from_client) = mpsc::channel(MPSC_CHANNEL_SIZE);

        // get identity
        let identity = identity.borrow().0.clone();

        // create networking swarm (within tokio context!! or it crashes)
-        let swarm = get_runtime()
-            .block_on(async { create_swarm(identity) })
-            .pyerr()?;
+        let _guard = pyo3_async_runtimes::tokio::get_runtime().enter();
+        let swarm = create_swarm(identity, from_client).pyerr()?.into_stream();

-        // spawn tokio task running the networking logic
-        get_runtime().spawn(async move {
-            networking_task(
-                swarm,
-                to_task_rx,
-                connection_update_tx,
-                gossipsub_message_tx,
-            )
-            .await;
-        });
-        Ok(Self::new(
-            to_task_tx,
-            connection_update_rx,
-            gossipsub_message_rx,
-        ))
+        Ok(Self {
+            swarm: Arc::new(Mutex::new(swarm)),
+            to_swarm,
+        })
    }

    #[gen_stub(skip)]
-    const fn __traverse__(&self, _visit: PyVisit<'_>) -> Result<(), PyTraverseError> {
-        Ok(()) // This is needed purely so `__clear__` can work
+    fn recv<'py>(&'py self, py: Python<'py>) -> PyResult<Bound<'py, PyAny>> {
+        let swarm = Arc::clone(&self.swarm);
+        pyo3_async_runtimes::tokio::future_into_py(py, async move {
+            swarm
+                .try_lock()
+                .map_err(|_| PyRuntimeError::new_err("called recv twice concurrently"))?
+                .next()
+                .await
+                .ok_or(PyErr::receiver_channel_closed())
+                .map(PyFromSwarm::from)
+        })
    }

-    #[gen_stub(skip)]
-    fn __clear__(&mut self) {
-        // TODO: may or may not need to await a "kill-signal" oneshot channel message,
-        //       to ensure that the networking task is done BEFORE exiting the clear function...
-        //       but this may require GIL?? and it may not be safe to call GIL here??
-        self.to_task_tx = None; // Using Option<T> as a trick to force channel to be dropped
-    }
-
-    // ---- Connection update receiver methods ----
-
-    /// Receives the next `ConnectionUpdate` from networking.
-    async fn connection_update_recv(&self) -> PyResult<PyConnectionUpdate> {
-        self.connection_update_rx
-            .lock()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-            .recv_py()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-    }
-
-    /// Receives at most `limit` `ConnectionUpdate`s from networking and returns them.
-    ///
-    /// For `limit = 0`, an empty collection of `ConnectionUpdate`s will be returned immediately.
-    /// For `limit > 0`, if there are no `ConnectionUpdate`s in the channel's queue this method
-    /// will sleep until a `ConnectionUpdate`s is sent.
-    async fn connection_update_recv_many(&self, limit: usize) -> PyResult<Vec<PyConnectionUpdate>> {
-        self.connection_update_rx
-            .lock()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-            .recv_many_py(limit)
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-    }
-
-    // TODO: rn this blocks main thread if anything else is awaiting the channel (bc its a mutex)
-    //       so its too dangerous to expose just yet. figure out a better semantics for handling this,
-    //       so things don't randomly block
-    // /// Tries to receive the next `ConnectionUpdate` from networking.
-    // fn connection_update_try_recv(&self) -> PyResult<Option<PyConnectionUpdate>> {
-    //     self.connection_update_rx.blocking_lock().try_recv_py()
-    // }
-    //
-    // /// Checks if the `ConnectionUpdate` channel is empty.
-    // fn connection_update_is_empty(&self) -> bool {
-    //     self.connection_update_rx.blocking_lock().is_empty()
-    // }
-    //
-    // /// Returns the number of `ConnectionUpdate`s in the channel.
-    // fn connection_update_len(&self) -> usize {
-    //     self.connection_update_rx.blocking_lock().len()
-    // }
-
    // ---- Gossipsub management methods ----

    /// Subscribe to a `GossipSub` topic.
@@ -475,10 +220,10 @@ impl PyNetworkingHandle {
        let (tx, rx) = oneshot::channel();

        // send off request to subscribe
-        self.to_task_tx()
-            .send_py(ToTask::GossipsubSubscribe {
+        self.to_swarm
+            .send_py(ToSwarm::Subscribe {
                topic,
-                result_tx: tx,
+                result_sender: tx,
            })
            .allow_threads_py() // allow-threads-aware async call
            .await?;
@@ -487,6 +232,7 @@ impl PyNetworkingHandle {
        rx.allow_threads_py() // allow-threads-aware async call
            .await
            .map_err(|_| PyErr::receiver_channel_closed())?
+            .pyerr()
    }

    /// Unsubscribes from a `GossipSub` topic.
@@ -496,10 +242,10 @@ impl PyNetworkingHandle {
        let (tx, rx) = oneshot::channel();

        // send off request to unsubscribe
-        self.to_task_tx()
-            .send_py(ToTask::GossipsubUnsubscribe {
+        self.to_swarm
+            .send_py(ToSwarm::Unsubscribe {
                topic,
-                result_tx: tx,
+                result_sender: tx,
            })
            .allow_threads_py() // allow-threads-aware async call
            .await?;
@@ -518,11 +264,11 @@ impl PyNetworkingHandle {

        // send off request to subscribe
        let data = Python::attach(|py| Vec::from(data.as_bytes(py)));
-        self.to_task_tx()
-            .send_py(ToTask::GossipsubPublish {
+        self.to_swarm
+            .send_py(ToSwarm::Publish {
                topic,
                data,
-                result_tx: tx,
+                result_sender: tx,
            })
            .allow_threads_py() // allow-threads-aware async call
            .await?;
@@ -531,64 +277,26 @@ impl PyNetworkingHandle {
        let _ = rx
            .allow_threads_py() // allow-threads-aware async call
            .await
-            .map_err(|_| PyErr::receiver_channel_closed())??;
+            .map_err(|_| PyErr::receiver_channel_closed())?
+            .map_err(|e| match e {
+                PublishError::AllQueuesFull(_) => PyAllQueuesFullError::new_err(),
+                PublishError::MessageTooLarge => PyMessageTooLargeError::new_err(),
+                PublishError::NoPeersSubscribedToTopic => {
+                    PyNoPeersSubscribedToTopicError::new_err()
+                }
+                e => PyRuntimeError::new_err(e.to_string()),
+            })?;
        Ok(())
    }
+}

-    // ---- Gossipsub message receiver methods ----
-
-    /// Receives the next message from the `GossipSub` network.
-    async fn gossipsub_recv(&self) -> PyResult<(String, Py<PyBytes>)> {
-        self.gossipsub_message_rx
-            .lock()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-            .recv_py()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-            .map(|(t, d)| (t, d.pybytes()))
+pyo3_stub_gen::inventory::submit! {
+    gen_methods_from_python! {
+        r#"
+            class PyNetworkingHandle:
+                async def recv() -> PyFromSwarm: ...
+        "#
    }
-
-    /// Receives at most `limit` messages from the `GossipSub` network and returns them.
-    ///
-    /// For `limit = 0`, an empty collection of messages will be returned immediately.
-    /// For `limit > 0`, if there are no messages in the channel's queue this method
-    /// will sleep until a message is sent.
-    async fn gossipsub_recv_many(&self, limit: usize) -> PyResult<Vec<(String, Py<PyBytes>)>> {
-        Ok(self
-            .gossipsub_message_rx
-            .lock()
-            .allow_threads_py() // allow-threads-aware async call
-            .await
-            .recv_many_py(limit)
-            .allow_threads_py() // allow-threads-aware async call
-            .await?
-            .into_iter()
-            .map(|(t, d)| (t, d.pybytes()))
-            .collect())
-    }
-
-    // TODO: rn this blocks main thread if anything else is awaiting the channel (bc its a mutex)
-    //       so its too dangerous to expose just yet. figure out a better semantics for handling this,
-    //       so things don't randomly block
-    // /// Tries to receive the next message from the `GossipSub` network.
-    // fn gossipsub_try_recv(&self) -> PyResult<Option<(String, Py<PyBytes>)>> {
-    //     Ok(self
-    //         .gossipsub_message_rx
-    //         .blocking_lock()
-    //         .try_recv_py()?
-    //         .map(|(t, d)| (t, d.pybytes())))
-    // }
-    //
-    // /// Checks if the `GossipSub` message channel is empty.
-    // fn gossipsub_is_empty(&self) -> bool {
-    //     self.gossipsub_message_rx.blocking_lock().is_empty()
-    // }
-    //
-    // /// Returns the number of `GossipSub` messages in the channel.
-    // fn gossipsub_len(&self) -> usize {
-    //     self.gossipsub_message_rx.blocking_lock().len()
-    // }
 }

 pub fn networking_submodule(m: &Bound<'_, PyModule>) -> PyResult<()> {
@@ -596,10 +304,8 @@ pub fn networking_submodule(m: &Bound<'_, PyModule>) -> PyResult<()> {
    m.add_class::<exception::PyAllQueuesFullError>()?;
    m.add_class::<exception::PyMessageTooLargeError>()?;

-    m.add_class::<PyConnectionUpdateType>()?;
-    m.add_class::<PyConnectionUpdate>()?;
-    m.add_class::<PyConnectionUpdateType>()?;
    m.add_class::<PyNetworkingHandle>()?;
+    m.add_class::<PyFromSwarm>()?;

    Ok(())
 }
--- a/rust/networking/Cargo.toml
+++ b/rust/networking/Cargo.toml
@@ -21,9 +21,10 @@ extend = { workspace = true }
 delegate = { workspace = true }

 # async
-tokio = { workspace = true, features = ["full"] }
+async-stream = { workspace = true }
 futures-lite = { workspace = true }
 futures-timer = { workspace = true }
+tokio = { workspace = true, features = ["full"] }

 # utility dependencies
 util = { workspace = true }
@@ -35,3 +36,4 @@ log = { workspace = true }

 # networking
 libp2p = { workspace = true, features = ["full"] }
+pin-project = "1.1.10"
--- a/rust/networking/examples/chatroom.rs
+++ b/rust/networking/examples/chatroom.rs
@@ -1,7 +1,9 @@
 use futures_lite::StreamExt;
-use libp2p::{gossipsub, identity, swarm::SwarmEvent};
-use networking::{discovery, swarm};
-use tokio::{io, io::AsyncBufReadExt as _, select};
+use libp2p::identity;
+use networking::swarm;
+use networking::swarm::{FromSwarm, ToSwarm};
+use tokio::sync::{mpsc, oneshot};
+use tokio::{io, io::AsyncBufReadExt as _};
 use tracing_subscriber::EnvFilter;
 use tracing_subscriber::filter::LevelFilter;

@@ -11,64 +13,69 @@ async fn main() {
        .with_env_filter(EnvFilter::from_default_env().add_directive(LevelFilter::INFO.into()))
        .try_init();

+    let (to_swarm, from_client) = mpsc::channel(20);
+
    // Configure swarm
-    let mut swarm =
-        swarm::create_swarm(identity::Keypair::generate_ed25519()).expect("Swarm creation failed");
+    let mut swarm = swarm::create_swarm(identity::Keypair::generate_ed25519(), from_client)
+        .expect("Swarm creation failed")
+        .into_stream();

    // Create a Gossipsub topic & subscribe
-    let topic = gossipsub::IdentTopic::new("test-net");
-    swarm
-        .behaviour_mut()
-        .gossipsub
-        .subscribe(&topic)
-        .expect("Subscribing to topic failed");
+    let (tx, rx) = oneshot::channel();
+    _ = to_swarm
+        .send(ToSwarm::Subscribe {
+            topic: "test-net".to_string(),
+            result_sender: tx,
+        })
+        .await
+        .expect("should send");

    // Read full lines from stdin
    let mut stdin = io::BufReader::new(io::stdin()).lines();
    println!("Enter messages via STDIN and they will be sent to connected peers using Gossipsub");

+    tokio::task::spawn(async move {
+        rx.await
+            .expect("tx not dropped")
+            .expect("subscribe shouldn't fail");
+        loop {
+            if let Ok(Some(line)) = stdin.next_line().await {
+                let (tx, rx) = oneshot::channel();
+                if let Err(e) = to_swarm
+                    .send(swarm::ToSwarm::Publish {
+                        topic: "test-net".to_string(),
+                        data: line.as_bytes().to_vec(),
+                        result_sender: tx,
+                    })
+                    .await
+                {
+                    println!("Send error: {e:?}");
+                    return;
+                };
+                match rx.await {
+                    Ok(Err(e)) => println!("Publish error: {e:?}"),
+                    Err(e) => println!("Publish error: {e:?}"),
+                    Ok(_) => {}
+                }
+            }
+        }
+    });
+
    // Kick it off
    loop {
-        select! {
-            // on gossipsub outgoing
-            Ok(Some(line)) = stdin.next_line() => {
-                if let Err(e) = swarm
-                    .behaviour_mut().gossipsub
-                    .publish(topic.clone(), line.as_bytes()) {
-                    println!("Publish error: {e:?}");
-                }
+        // on gossipsub outgoing
+        match swarm.next().await {
+            // on gossipsub incoming
+            Some(FromSwarm::Discovered { peer_id }) => {
+                println!("\n\nconnected to {peer_id}\n\n")
            }
-            event = swarm.next() => match event {
-                // on gossipsub incoming
-                Some(SwarmEvent::Behaviour(swarm::BehaviourEvent::Gossipsub(gossipsub::Event::Message {
-                    propagation_source: peer_id,
-                    message_id: id,
-                    message,
-                }))) => println!(
-                        "\n\nGot message: '{}' with id: {id} from peer: {peer_id}\n\n",
-                        String::from_utf8_lossy(&message.data),
-                    ),
-
-                // on discovery
-                Some(SwarmEvent::Behaviour(swarm::BehaviourEvent::Discovery(e)) )=> match e {
-                    discovery::Event::ConnectionEstablished {
-                        peer_id, connection_id, remote_ip, remote_tcp_port
-                    } => {
-                        println!("\n\nConnected to: {peer_id}; connection ID: {connection_id}; remote IP: {remote_ip}; remote TCP port: {remote_tcp_port}\n\n");
-                    }
-                    discovery::Event::ConnectionClosed {
-                        peer_id, connection_id, remote_ip, remote_tcp_port
-                    } => {
-                        eprintln!("\n\nDisconnected from: {peer_id}; connection ID: {connection_id}; remote IP: {remote_ip}; remote TCP port: {remote_tcp_port}\n\n");
-                    }
-                }
-
-                // ignore outgoing errors: those are normal
-                e@Some(SwarmEvent::OutgoingConnectionError { .. }) => { log::debug!("Outgoing connection error: {e:?}"); }
-
-                // otherwise log any other event
-                e => { log::info!("Other event {e:?}"); }
+            Some(FromSwarm::Expired { peer_id }) => {
+                println!("\n\ndisconnected from {peer_id}\n\n")
            }
+            Some(FromSwarm::Message { from, topic, data }) => {
+                println!("{topic}/{from}:\n{}", String::from_utf8_lossy(&data))
+            }
+            None => {}
        }
    }
 }
--- a/rust/networking/src/swarm.rs
+++ b/rust/networking/src/swarm.rs
@@ -1,9 +1,11 @@
-use crate::alias;
-use crate::swarm::transport::tcp_transport;
-pub use behaviour::{Behaviour, BehaviourEvent};
-use libp2p::{SwarmBuilder, identity};
+use std::pin::Pin;

-pub type Swarm = libp2p::Swarm<Behaviour>;
+use crate::swarm::transport::tcp_transport;
+use crate::{alias, discovery};
+pub use behaviour::{Behaviour, BehaviourEvent};
+use futures_lite::{Stream, StreamExt};
+use libp2p::{PeerId, SwarmBuilder, gossipsub, identity, swarm::SwarmEvent};
+use tokio::sync::{mpsc, oneshot};

 /// The current version of the network: this prevents devices running different versions of the
 /// software from interacting with each other.
@@ -15,8 +17,139 @@ pub type Swarm = libp2p::Swarm<Behaviour>;
 pub const NETWORK_VERSION: &[u8] = b"v0.0.1";
 pub const OVERRIDE_VERSION_ENV_VAR: &str = "EXO_LIBP2P_NAMESPACE";

+pub enum ToSwarm {
+    Unsubscribe {
+        topic: String,
+        // Sender for the unsubscribe result (False = not subscribed)
+        result_sender: oneshot::Sender<bool>,
+    },
+    Subscribe {
+        topic: String,
+        // Sender for the subscribe result (False = not subscribed), errors if we can't publish our
+        // subscription to peers
+        result_sender: oneshot::Sender<Result<bool, gossipsub::SubscriptionError>>,
+    },
+    Publish {
+        topic: String,
+        data: Vec<u8>,
+        // Sender for the publish result, makes it easier to correlate publish with publish
+        // errors
+        result_sender: oneshot::Sender<Result<gossipsub::MessageId, gossipsub::PublishError>>,
+    },
+}
+pub enum FromSwarm {
+    Message {
+        from: PeerId,
+        topic: String,
+        data: Vec<u8>,
+    },
+    Discovered {
+        peer_id: PeerId,
+    },
+    Expired {
+        peer_id: PeerId,
+    },
+}
+
+pub struct Swarm {
+    swarm: libp2p::Swarm<Behaviour>,
+    from_client: mpsc::Receiver<ToSwarm>,
+}
+
+impl Swarm {
+    pub fn into_stream(self) -> Pin<Box<dyn Stream<Item = FromSwarm> + Send>> {
+        let Swarm {
+            mut swarm,
+            mut from_client,
+        } = self;
+        let stream = async_stream::stream! {
+            loop {
+                tokio::select! {
+                    msg = from_client.recv() => {
+                        let Some(msg) = msg else { break };
+                        on_message(&mut swarm, msg);
+                    }
+                    event = swarm.next() => {
+                        let Some(event) = event else { break };
+                        if let Some(item) = filter_swarm_event(event) {
+                            yield item;
+                        }
+                    }
+                }
+            }
+        };
+        Box::pin(stream)
+    }
+}
+
+fn on_message(swarm: &mut libp2p::Swarm<Behaviour>, message: ToSwarm) {
+    match message {
+        ToSwarm::Subscribe {
+            topic,
+            result_sender,
+        } => {
+            let result = swarm
+                .behaviour_mut()
+                .gossipsub
+                .subscribe(&gossipsub::IdentTopic::new(topic));
+            _ = result_sender.send(result);
+        }
+        ToSwarm::Unsubscribe {
+            topic,
+            result_sender,
+        } => {
+            let result = swarm
+                .behaviour_mut()
+                .gossipsub
+                .unsubscribe(&gossipsub::IdentTopic::new(topic));
+            _ = result_sender.send(result);
+        }
+        ToSwarm::Publish {
+            topic,
+            data,
+            result_sender,
+        } => {
+            let result = swarm
+                .behaviour_mut()
+                .gossipsub
+                .publish(gossipsub::IdentTopic::new(topic), data);
+            _ = result_sender.send(result);
+        }
+    }
+}
+
+fn filter_swarm_event(event: SwarmEvent<BehaviourEvent>) -> Option<FromSwarm> {
+    match event {
+        SwarmEvent::Behaviour(BehaviourEvent::Gossipsub(gossipsub::Event::Message {
+            message:
+                gossipsub::Message {
+                    source: Some(peer_id),
+                    topic,
+                    data,
+                    ..
+                },
+            ..
+        })) => Some(FromSwarm::Message {
+            from: peer_id,
+            topic: topic.into_string(),
+            data,
+        }),
+        SwarmEvent::Behaviour(BehaviourEvent::Discovery(
+            discovery::Event::ConnectionEstablished { peer_id, .. },
+        )) => Some(FromSwarm::Discovered { peer_id }),
+        SwarmEvent::Behaviour(BehaviourEvent::Discovery(discovery::Event::ConnectionClosed {
+            peer_id,
+            ..
+        })) => Some(FromSwarm::Expired { peer_id }),
+        _ => None,
+    }
+}
+
 /// Create and configure a swarm which listens to all ports on OS
-pub fn create_swarm(keypair: identity::Keypair) -> alias::AnyResult<Swarm> {
+pub fn create_swarm(
+    keypair: identity::Keypair,
+    from_client: mpsc::Receiver<ToSwarm>,
+) -> alias::AnyResult<Swarm> {
    let mut swarm = SwarmBuilder::with_existing_identity(keypair)
        .with_tokio()
        .with_other_transport(tcp_transport)?
@@ -25,7 +158,7 @@ pub fn create_swarm(keypair: identity::Keypair) -> alias::AnyResult<Swarm> {

    // Listen on all interfaces and whatever port the OS assigns
    swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse()?)?;
-    Ok(swarm)
+    Ok(Swarm { swarm, from_client })
 }

 mod transport {
--- a/src/exo/routing/connection_message.py
+++ b/src/exo/routing/connection_message.py
@@ -1,6 +1,4 @@
-from enum import Enum
-
-from exo_pyo3_bindings import ConnectionUpdate, ConnectionUpdateType
+from exo_pyo3_bindings import PyFromSwarm

 from exo.shared.types.common import NodeId
 from exo.utils.pydantic_ext import CamelCaseModel
@@ -8,30 +6,10 @@ from exo.utils.pydantic_ext import CamelCaseModel
 """Serialisable types for Connection Updates/Messages"""


-class ConnectionMessageType(Enum):
-    Connected = 0
-    Disconnected = 1
-
-    @staticmethod
-    def from_update_type(update_type: ConnectionUpdateType):
-        match update_type:
-            case ConnectionUpdateType.Connected:
-                return ConnectionMessageType.Connected
-            case ConnectionUpdateType.Disconnected:
-                return ConnectionMessageType.Disconnected
-
-
 class ConnectionMessage(CamelCaseModel):
    node_id: NodeId
-    connection_type: ConnectionMessageType
-    remote_ipv4: str
-    remote_tcp_port: int
+    connected: bool

    @classmethod
-    def from_update(cls, update: ConnectionUpdate) -> "ConnectionMessage":
-        return cls(
-            node_id=NodeId(update.peer_id),
-            connection_type=ConnectionMessageType.from_update_type(update.update_type),
-            remote_ipv4=update.remote_ipv4,
-            remote_tcp_port=update.remote_tcp_port,
-        )
+    def from_update(cls, update: PyFromSwarm.Connection) -> "ConnectionMessage":
+        return cls(node_id=NodeId(update.peer_id), connected=update.connected)
--- a/src/exo/routing/router.py
+++ b/src/exo/routing/router.py
@@ -17,6 +17,7 @@ from exo_pyo3_bindings import (
    MessageTooLargeError,
    NetworkingHandle,
    NoPeersSubscribedToTopicError,
+    PyFromSwarm,
 )
 from filelock import FileLock
 from loguru import logger
@@ -121,7 +122,8 @@ class Router:
            send = self.networking_receiver.clone_sender()
        router = TopicRouter[T](topic, send)
        self.topic_routers[topic.topic] = cast(TopicRouter[CamelCaseModel], router)
-        await self._networking_subscribe(str(topic.topic))
+        if self._tg.is_running():
+            await self._networking_subscribe(topic.topic)

    def sender[T: CamelCaseModel](self, topic: TypedTopic[T]) -> Sender[T]:
        router = self.topic_routers.get(topic.topic, None)
@@ -152,8 +154,10 @@ class Router:
                    router = self.topic_routers[topic]
                    tg.start_soon(router.run)
                tg.start_soon(self._networking_recv)
-                tg.start_soon(self._networking_recv_connection_messages)
                tg.start_soon(self._networking_publish)
+                # subscribe to pending topics
+                for topic in self.topic_routers:
+                    await self._networking_subscribe(topic)
                # Router only shuts down if you cancel it.
                await sleep_forever()
        finally:
@@ -175,27 +179,35 @@ class Router:

    async def _networking_recv(self):
        while True:
-            topic, data = await self._net.gossipsub_recv()
-            logger.trace(f"Received message on {topic} with payload {data}")
-            if topic not in self.topic_routers:
-                logger.warning(f"Received message on unknown or inactive topic {topic}")
-                continue
+            from_swarm = await self._net.recv()
+            logger.debug(from_swarm)
+            match from_swarm:
+                case PyFromSwarm.Message(origin, topic, data):
+                    logger.trace(
+                        f"Received message on {topic} from {origin} with payload {data}"
+                    )
+                    if topic not in self.topic_routers:
+                        logger.warning(
+                            f"Received message on unknown or inactive topic {topic}"
+                        )
+                        continue

-            router = self.topic_routers[topic]
-            await router.publish_bytes(data)
-
-    async def _networking_recv_connection_messages(self):
-        while True:
-            update = await self._net.connection_update_recv()
-            message = ConnectionMessage.from_update(update)
-            logger.trace(
-                f"Received message on connection_messages with payload {message}"
-            )
-            if CONNECTION_MESSAGES.topic in self.topic_routers:
-                router = self.topic_routers[CONNECTION_MESSAGES.topic]
-                assert router.topic.model_type == ConnectionMessage
-                router = cast(TopicRouter[ConnectionMessage], router)
-                await router.publish(message)
+                    router = self.topic_routers[topic]
+                    await router.publish_bytes(data)
+                case PyFromSwarm.Connection():
+                    message = ConnectionMessage.from_update(from_swarm)
+                    logger.trace(
+                        f"Received message on connection_messages with payload {message}"
+                    )
+                    if CONNECTION_MESSAGES.topic in self.topic_routers:
+                        router = self.topic_routers[CONNECTION_MESSAGES.topic]
+                        assert router.topic.model_type == ConnectionMessage
+                        router = cast(TopicRouter[ConnectionMessage], router)
+                        await router.publish(message)
+                case _:
+                    logger.critical(
+                        "failed to exhaustively check FromSwarm messages - logic error"
+                    )

    async def _networking_publish(self):
        with self.networking_receiver as networked_items:
--- a/src/exo/shared/tests/test_election.py
+++ b/src/exo/shared/tests/test_election.py
@@ -1,7 +1,7 @@
 import pytest
 from anyio import create_task_group, fail_after, move_on_after

-from exo.routing.connection_message import ConnectionMessage, ConnectionMessageType
+from exo.routing.connection_message import ConnectionMessage
 from exo.shared.election import Election, ElectionMessage, ElectionResult
 from exo.shared.types.commands import ForwarderCommand, TestCommand
 from exo.shared.types.common import NodeId, SessionId, SystemId
@@ -327,14 +327,7 @@ async def test_connection_message_triggers_new_round_broadcast() -> None:
            tg.start_soon(election.run)

            # Send any connection message object; we close quickly to cancel before result creation
-            await cm_tx.send(
-                ConnectionMessage(
-                    node_id=NodeId(),
-                    connection_type=ConnectionMessageType.Connected,
-                    remote_ipv4="",
-                    remote_tcp_port=0,
-                )
-            )
+            await cm_tx.send(ConnectionMessage(node_id=NodeId(), connected=True))

            # Expect a broadcast for the new round at clock=1
            while True:
--- a/uv.lock
+++ b/uv.lock
@@ -193,20 +193,14 @@ sdist = { url = "https://files.pythonhosted.org/packages/eb/56/b1ba7935a17738ae8
 wheels = [
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@@ -378,7 +366,7 @@ dependencies = [
    { name = "loguru", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "mflux", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "mlx", version = "0.30.6", source = { registry = "https://pypi.org/simple" }, extra = ["cpu"], marker = "sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
    { name = "mlx-lm", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "msgspec", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "openai-harmony", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
@@ -467,7 +455,7 @@ requires-dist = [

 [[package]]
 name = "exo-pyo3-bindings"
-version = "0.1.0"
+version = "0.2.0"
 source = { editable = "rust/exo_pyo3_bindings" }

 [package.dev-dependencies]
@@ -1023,7 +1011,7 @@ dependencies = [
    { name = "huggingface-hub", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "matplotlib", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "mlx", version = "0.30.6", source = { registry = "https://pypi.org/simple" }, extra = ["cuda13"], marker = "sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
    { name = "numpy", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "opencv-python", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "piexif", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
@@ -1070,7 +1058,7 @@ cuda13 = [

 [[package]]
 name = "mlx"
-version = "0.30.7.dev20260220+13998a05"
+version = "0.30.7.dev20260224+13998a05"
 source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }
 resolution-markers = [
    "sys_platform == 'darwin'",
@@ -1106,7 +1094,7 @@ version = "0.30.7"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jinja2", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
    { name = "numpy", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "protobuf", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
    { name = "pyyaml", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },