File size: 6,267 Bytes
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use std::panic::AssertUnwindSafe;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering;
use codex_code_mode_protocol::CellId;
use codex_code_mode_protocol::CodeModeSessionDelegate;
use codex_code_mode_protocol::host::EncodedFrame;
use codex_code_mode_protocol::host::HostToClient;
use codex_code_mode_protocol::host::RequestId;
use tokio::sync::mpsc;
use tokio_util::sync::CancellationToken;
pub(in crate::remote_session) use self::cleanup::SessionCleanup;
use self::delegate_runtime::DelegateRuntime;
use self::request_tracker::RequestTracker;
use self::session_registry::SessionRegistry;
pub(super) use self::types::DriverCommand;
pub(super) use self::types::DriverEvent;
pub(in crate::remote_session) use self::types::RemoteSession;
mod cell_ids;
mod cleanup;
mod commands;
mod delegate_runtime;
mod request_tracker;
mod responses;
mod session_registry;
mod types;
pub(super) struct DriverLifecycle {
pub(super) alive: Arc<AtomicBool>,
pub(super) failure: Arc<std::sync::Mutex<Option<String>>>,
pub(super) cancellation: CancellationToken,
}
pub(super) struct ConnectionDriver {
command_rx: mpsc::Receiver<DriverCommand>,
event_rx: mpsc::Receiver<DriverEvent>,
event_tx: mpsc::Sender<DriverEvent>,
execute_claim_rx: mpsc::UnboundedReceiver<RequestId>,
outgoing_tx: mpsc::Sender<EncodedFrame>,
requests: RequestTracker,
deferred_host_messages: VecDeque<HostToClient>,
sessions: SessionRegistry,
delegates: DelegateRuntime,
alive: Arc<AtomicBool>,
failure: Arc<std::sync::Mutex<Option<String>>>,
cancellation: CancellationToken,
failed: bool,
}
impl ConnectionDriver {
pub(super) fn new(
command_rx: mpsc::Receiver<DriverCommand>,
event_rx: mpsc::Receiver<DriverEvent>,
event_tx: mpsc::Sender<DriverEvent>,
outgoing_tx: mpsc::Sender<EncodedFrame>,
lifecycle: DriverLifecycle,
) -> (Self, mpsc::UnboundedSender<RequestId>) {
let (execute_claim_tx, execute_claim_rx) = mpsc::unbounded_channel();
(
Self {
command_rx,
event_rx,
event_tx: event_tx.clone(),
execute_claim_rx,
outgoing_tx,
requests: RequestTracker::new(),
deferred_host_messages: VecDeque::new(),
sessions: SessionRegistry::new(),
delegates: DelegateRuntime::new(event_tx),
alive: lifecycle.alive,
failure: lifecycle.failure,
cancellation: lifecycle.cancellation,
failed: false,
},
execute_claim_tx,
)
}
pub(super) async fn run(mut self) {
loop {
tokio::select! {
biased;
_ = self.cancellation.cancelled() => {
self.fail("code-mode host connection closed".to_string());
return;
}
event = self.event_rx.recv() => {
let Some(event) = event else {
self.fail("code-mode host event stream closed".to_string());
return;
};
if !self.cancel_dropped_callers() || !self.handle_event(event) {
return;
}
}
claim = self.execute_claim_rx.recv() => {
let Some(request_id) = claim else {
self.fail("code-mode execute claim stream closed".to_string());
return;
};
self.requests.claim_execute(request_id);
}
command = self.command_rx.recv() => {
let Some(command) = command else {
self.fail("code-mode host command stream closed".to_string());
return;
};
if !self.cancel_dropped_callers() || !self.handle_command(command) {
return;
}
}
}
}
}
fn handle_event(&mut self, event: DriverEvent) -> bool {
let keep_running = match event {
DriverEvent::HostMessage(message) => self.handle_host_message(message),
DriverEvent::DelegateCompleted { id, result } => self.complete_delegate(id, result),
DriverEvent::RequestCancelled(id) => self.cancel_request(id),
DriverEvent::Failed(reason) => {
self.fail(reason);
false
}
};
if keep_running {
self.flush_deferred_waits()
} else {
false
}
}
fn queue_frame(&mut self, frame: EncodedFrame) -> bool {
match self.outgoing_tx.try_send(frame) {
Ok(()) => true,
Err(mpsc::error::TrySendError::Full(_)) => {
self.fail("code-mode host outgoing queue is full".to_string());
false
}
Err(mpsc::error::TrySendError::Closed(_)) => {
self.fail("code-mode host writer closed".to_string());
false
}
}
}
fn fail(&mut self, reason: String) {
if self.failed {
return;
}
self.failed = true;
self.alive.store(false, Ordering::Release);
let reason = {
let mut failure = self
.failure
.lock()
.unwrap_or_else(std::sync::PoisonError::into_inner);
failure.get_or_insert(reason).clone()
};
self.requests.fail_all(&reason);
let failed_sessions = self.sessions.drain();
self.delegates.fail_all(failed_sessions);
self.cancellation.cancel();
}
}
impl Drop for ConnectionDriver {
fn drop(&mut self) {
self.fail("code-mode connection driver stopped unexpectedly".to_string());
}
}
fn notify_cell_closed(delegate: &Arc<dyn CodeModeSessionDelegate>, cell_id: &CellId) {
let _ = std::panic::catch_unwind(AssertUnwindSafe(|| delegate.cell_closed(cell_id)));
}
#[cfg(test)]
#[path = "driver_tests.rs"]
mod tests;
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