677 lines
23 KiB
Rust
677 lines
23 KiB
Rust
use std::collections::HashMap;
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use std::sync::{Arc, Mutex, Weak};
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use std::time::Duration;
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use tokio::sync::{Mutex as AsyncMutex, oneshot, watch};
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use tokio::time::{Instant, sleep_until, timeout};
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use crate::channels::{Channel, ChannelError, LivePolicy, TurnSink, TurnTarget};
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use crate::delivery::{PresentationPolicy, project_snapshot};
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use crate::session::{TurnSnapshot, TurnStatus};
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use crate::task_supervisor::TaskSupervisor;
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const SINK_CALL_TIMEOUT: Duration = Duration::from_secs(30);
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const FINAL_RETRY_DELAYS: &[Duration] = &[
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Duration::from_secs(1),
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Duration::from_secs(2),
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Duration::from_secs(4),
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];
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#[derive(Debug)]
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pub enum DeliveryError {
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ChannelNotFound(String),
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OpenFailed(ChannelError),
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SnapshotStreamClosed,
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SupervisorStopping,
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FinalTimedOut,
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FinalFailed(ChannelError),
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}
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impl std::fmt::Display for DeliveryError {
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fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::ChannelNotFound(channel) => write!(formatter, "channel not found: {channel}"),
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Self::OpenFailed(error) => write!(formatter, "failed to open turn sink: {error}"),
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Self::SnapshotStreamClosed => {
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formatter.write_str("turn snapshot stream closed before a terminal state")
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}
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Self::SupervisorStopping => {
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formatter.write_str("cannot start turn delivery while Gateway is stopping")
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}
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Self::FinalTimedOut => formatter.write_str("final turn delivery timed out"),
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Self::FinalFailed(error) => write!(formatter, "final turn delivery failed: {error}"),
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}
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}
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}
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impl std::error::Error for DeliveryError {}
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/// Shared ordering boundary for writes to one `(channel, chat_id)` target.
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///
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/// The registry stores weak references so inactive conversations disappear
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/// without a cleanup task. Callers hold the returned lock only around one
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/// external write, never for the lifetime of a Turn.
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#[derive(Clone, Default)]
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pub struct ConversationWriteLocks {
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locks: Arc<Mutex<HashMap<String, Weak<AsyncMutex<()>>>>>,
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}
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impl ConversationWriteLocks {
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pub fn for_target(&self, channel: &str, chat_id: &str) -> Arc<AsyncMutex<()>> {
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let key = format!("{channel}\0{chat_id}");
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let mut locks = self
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.locks
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.lock()
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.unwrap_or_else(|poisoned| poisoned.into_inner());
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if let Some(existing) = locks.get(&key).and_then(Weak::upgrade) {
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return existing;
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}
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let lock = Arc::new(AsyncMutex::new(()));
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locks.insert(key, Arc::downgrade(&lock));
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lock
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}
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}
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#[derive(Clone)]
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pub struct DeliveryCoordinator {
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write_locks: ConversationWriteLocks,
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sink_call_timeout: Duration,
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final_retry_delays: Arc<[Duration]>,
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}
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pub(crate) struct SinkRoute {
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pub channel: String,
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pub chat_id: String,
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pub live_policy: LivePolicy,
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pub presentation: PresentationPolicy,
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}
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impl DeliveryCoordinator {
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pub fn new(write_locks: ConversationWriteLocks) -> Self {
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Self {
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write_locks,
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sink_call_timeout: SINK_CALL_TIMEOUT,
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final_retry_delays: FINAL_RETRY_DELAYS.into(),
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}
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}
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#[cfg(test)]
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fn for_test(
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sink_call_timeout: Duration,
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final_retry_delays: impl Into<Arc<[Duration]>>,
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) -> Self {
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Self {
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write_locks: ConversationWriteLocks::default(),
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sink_call_timeout,
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final_retry_delays: final_retry_delays.into(),
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}
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}
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pub fn write_locks(&self) -> ConversationWriteLocks {
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self.write_locks.clone()
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}
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pub async fn open_and_deliver(
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&self,
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channel: Arc<dyn Channel + Send + Sync>,
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target: TurnTarget,
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presentation: PresentationPolicy,
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snapshots: watch::Receiver<Arc<TurnSnapshot>>,
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) -> Result<(), DeliveryError> {
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let live_policy = channel.live_policy();
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let sink = channel
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.open_turn(target.clone())
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.await
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.map_err(DeliveryError::OpenFailed)?;
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self.deliver(
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&target.channel,
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&target.chat_id,
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live_policy,
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presentation,
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snapshots,
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sink,
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)
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.await
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}
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/// Start one sink lifecycle under the Gateway's task owner and return a
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/// bounded completion report to the caller.
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pub fn spawn(
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&self,
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supervisor: &TaskSupervisor,
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channel: Arc<dyn Channel + Send + Sync>,
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target: TurnTarget,
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presentation: PresentationPolicy,
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snapshots: watch::Receiver<Arc<TurnSnapshot>>,
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) -> Result<oneshot::Receiver<Result<(), DeliveryError>>, DeliveryError> {
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let (result_tx, result_rx) = oneshot::channel();
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let coordinator = self.clone();
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let task_name = format!("turn-delivery:{}:{}", target.channel, target.chat_id);
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let spawned = supervisor.spawn(task_name, async move {
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let result = coordinator
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.open_and_deliver(channel, target, presentation, snapshots)
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.await;
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if let Err(error) = &result {
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tracing::error!(error = %error, "Turn delivery failed");
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}
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let _ = result_tx.send(result);
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});
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if !spawned {
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return Err(DeliveryError::SupervisorStopping);
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}
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Ok(result_rx)
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}
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pub(crate) fn spawn_sink(
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&self,
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supervisor: &TaskSupervisor,
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route: SinkRoute,
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mut snapshots: watch::Receiver<Arc<TurnSnapshot>>,
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mut sink: Box<dyn TurnSink>,
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) -> Result<oneshot::Receiver<Result<(), DeliveryError>>, DeliveryError> {
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let SinkRoute {
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channel,
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chat_id,
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live_policy,
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presentation,
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} = route;
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let (result_tx, result_rx) = oneshot::channel();
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let coordinator = self.clone();
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let task_name = format!("turn-delivery:{channel}:{chat_id}");
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let cancellation = supervisor.cancellation_token();
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let shutdown_snapshot = snapshots.clone();
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let spawned = supervisor.spawn_graceful(task_name, async move {
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let mut delivery = Box::pin(coordinator.deliver_sink(
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&channel,
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&chat_id,
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live_policy,
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presentation,
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&mut snapshots,
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&mut *sink,
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));
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let result = tokio::select! {
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result = &mut delivery => result,
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() = cancellation.cancelled() => {
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drop(delivery);
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let snapshot = shutdown_snapshot.borrow().clone();
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let projected = project_snapshot(&snapshot, presentation);
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coordinator
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.abort_for_shutdown(&channel, &chat_id, &mut *sink, &projected)
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.await
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}
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};
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if let Err(error) = &result {
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tracing::error!(channel, chat_id, error = %error, "Turn delivery failed");
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}
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let _ = result_tx.send(result);
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});
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if !spawned {
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return Err(DeliveryError::SupervisorStopping);
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}
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Ok(result_rx)
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}
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pub async fn deliver(
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&self,
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channel: &str,
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chat_id: &str,
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live_policy: LivePolicy,
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presentation: PresentationPolicy,
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mut snapshots: watch::Receiver<Arc<TurnSnapshot>>,
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mut sink: Box<dyn TurnSink>,
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) -> Result<(), DeliveryError> {
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self.deliver_sink(
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channel,
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chat_id,
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live_policy,
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presentation,
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&mut snapshots,
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&mut *sink,
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)
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.await
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}
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async fn deliver_sink(
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&self,
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channel: &str,
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chat_id: &str,
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live_policy: LivePolicy,
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presentation: PresentationPolicy,
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snapshots: &mut watch::Receiver<Arc<TurnSnapshot>>,
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sink: &mut dyn TurnSink,
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) -> Result<(), DeliveryError> {
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let target_lock = self.write_locks.for_target(channel, chat_id);
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let min_interval = match live_policy {
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LivePolicy::FinalOnly => None,
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LivePolicy::Snapshot { min_interval } if presentation.live => Some(min_interval),
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LivePolicy::Snapshot { .. } => None,
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};
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let mut next_update_at = Instant::now();
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loop {
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let snapshot = snapshots.borrow_and_update().clone();
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if snapshot.status != TurnStatus::Running {
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let projected = project_snapshot(&snapshot, presentation);
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return self.deliver_terminal(&target_lock, sink, &projected).await;
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}
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if let Some(interval) = min_interval {
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while Instant::now() < next_update_at {
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tokio::select! {
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changed = snapshots.changed() => {
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changed.map_err(|_| DeliveryError::SnapshotStreamClosed)?;
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let latest = snapshots.borrow_and_update().clone();
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if latest.status != TurnStatus::Running {
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let projected = project_snapshot(&latest, presentation);
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return self.deliver_terminal(&target_lock, sink, &projected).await;
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}
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}
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() = sleep_until(next_update_at) => break,
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}
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}
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let latest = snapshots.borrow_and_update().clone();
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if latest.status != TurnStatus::Running {
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let projected = project_snapshot(&latest, presentation);
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return self.deliver_terminal(&target_lock, sink, &projected).await;
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}
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let projected = project_snapshot(&latest, presentation);
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let _guard = target_lock.lock().await;
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match timeout(self.sink_call_timeout, sink.update(&projected)).await {
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Ok(Ok(())) => {}
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Ok(Err(error)) => {
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tracing::warn!(error = %error, revision = projected.revision, "Live turn update failed; waiting for a newer snapshot");
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}
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Err(_) => {
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tracing::warn!(
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revision = projected.revision,
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"Live turn update timed out; waiting for a newer snapshot"
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);
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}
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}
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next_update_at = Instant::now() + interval;
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}
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snapshots
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.changed()
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.await
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.map_err(|_| DeliveryError::SnapshotStreamClosed)?;
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}
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}
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async fn abort_for_shutdown(
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&self,
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channel: &str,
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chat_id: &str,
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sink: &mut dyn TurnSink,
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snapshot: &TurnSnapshot,
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) -> Result<(), DeliveryError> {
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let target_lock = self.write_locks.for_target(channel, chat_id);
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let _guard = target_lock.lock().await;
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match timeout(self.sink_call_timeout, sink.abort(snapshot)).await {
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Ok(Ok(())) => Ok(()),
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Ok(Err(error)) => Err(DeliveryError::FinalFailed(error)),
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Err(_) => Err(DeliveryError::FinalTimedOut),
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}
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}
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async fn deliver_terminal(
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&self,
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target_lock: &Arc<AsyncMutex<()>>,
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sink: &mut dyn TurnSink,
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snapshot: &TurnSnapshot,
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) -> Result<(), DeliveryError> {
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let attempts = self.final_retry_delays.len() + 1;
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for attempt in 0..attempts {
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let _guard = target_lock.lock().await;
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let result = if snapshot.status == TurnStatus::Completed {
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timeout(self.sink_call_timeout, sink.finish(snapshot)).await
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} else {
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timeout(self.sink_call_timeout, sink.abort(snapshot)).await
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};
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drop(_guard);
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match result {
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Ok(Ok(())) => return Ok(()),
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Ok(Err(error))
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if error.is_transient() && attempt < self.final_retry_delays.len() =>
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{
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sleep_until(Instant::now() + self.final_retry_delays[attempt]).await;
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}
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Ok(Err(error)) => return Err(DeliveryError::FinalFailed(error)),
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Err(_) if attempt < self.final_retry_delays.len() => {
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sleep_until(Instant::now() + self.final_retry_delays[attempt]).await;
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}
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Err(_) => return Err(DeliveryError::FinalTimedOut),
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}
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}
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unreachable!()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use async_trait::async_trait;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use tokio::sync::{Mutex as TokioMutex, Notify};
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use crate::agent::TurnEvent;
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use crate::bus::{MessageBus, OutboundMessage};
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use crate::channels::{Channel, TurnSink};
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use crate::session::{TurnBlock, TurnController};
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#[derive(Default)]
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struct SinkState {
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updates: TokioMutex<Vec<TurnSnapshot>>,
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terminal: TokioMutex<Vec<TurnSnapshot>>,
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update_started: Notify,
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release_update: Notify,
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block_first_update: bool,
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fail_updates: AtomicUsize,
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fail_finish: AtomicUsize,
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}
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struct RecordingSink(Arc<SinkState>);
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struct SinkChannel {
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state: Arc<SinkState>,
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opened: AtomicUsize,
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}
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#[async_trait]
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impl Channel for SinkChannel {
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fn name(&self) -> &str {
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"sink-channel"
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}
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fn is_running(&self) -> bool {
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true
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}
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async fn start(&self, _bus: Arc<MessageBus>) -> Result<(), ChannelError> {
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Ok(())
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}
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async fn stop(&self) -> Result<(), ChannelError> {
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Ok(())
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}
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fn live_policy(&self) -> LivePolicy {
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LivePolicy::FinalOnly
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}
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async fn open_turn(&self, _target: TurnTarget) -> Result<Box<dyn TurnSink>, ChannelError> {
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self.opened.fetch_add(1, Ordering::SeqCst);
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Ok(sink(self.state.clone()))
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}
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async fn send(&self, _msg: OutboundMessage) -> Result<(), ChannelError> {
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Ok(())
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}
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}
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#[async_trait]
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impl TurnSink for RecordingSink {
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async fn update(&mut self, snapshot: &TurnSnapshot) -> Result<(), ChannelError> {
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self.0.update_started.notify_waiters();
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if self.0.block_first_update && self.0.updates.lock().await.is_empty() {
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self.0.release_update.notified().await;
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}
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if self
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.0
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.fail_updates
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.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |remaining| {
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remaining.checked_sub(1)
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})
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.is_ok()
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{
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return Err(ChannelError::SendError("update".into()));
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}
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self.0.updates.lock().await.push(snapshot.clone());
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Ok(())
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}
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async fn finish(&mut self, snapshot: &TurnSnapshot) -> Result<(), ChannelError> {
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if self
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.0
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.fail_finish
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.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |remaining| {
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remaining.checked_sub(1)
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})
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.is_ok()
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{
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return Err(ChannelError::SendError("finish".into()));
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}
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self.0.terminal.lock().await.push(snapshot.clone());
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Ok(())
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}
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async fn abort(&mut self, snapshot: &TurnSnapshot) -> Result<(), ChannelError> {
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self.0.terminal.lock().await.push(snapshot.clone());
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Ok(())
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}
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}
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fn sink(state: Arc<SinkState>) -> Box<dyn TurnSink> {
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Box::new(RecordingSink(state))
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}
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#[tokio::test]
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async fn slow_sink_observes_latest_snapshot_and_terminal_bypasses_throttle() {
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let state = Arc::new(SinkState {
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block_first_update: true,
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..SinkState::default()
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});
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let (controller, emitter, receiver) = TurnController::start("session", "message");
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let coordinator = DeliveryCoordinator::for_test(Duration::from_secs(30), []);
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let task = tokio::spawn({
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let state = state.clone();
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async move {
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coordinator
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.deliver(
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"cli_chat",
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"chat",
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LivePolicy::Snapshot {
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min_interval: Duration::from_secs(10),
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},
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PresentationPolicy::interactive(),
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receiver,
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sink(state),
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)
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.await
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}
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});
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state.update_started.notified().await;
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emitter
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.emit(TurnEvent::TextDelta {
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iteration: 0,
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delta: "a".into(),
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})
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.unwrap();
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emitter
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.emit(TurnEvent::TextDelta {
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iteration: 0,
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delta: "b".into(),
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})
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.unwrap();
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state.release_update.notify_waiters();
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tokio::task::yield_now().await;
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controller.complete(None);
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assert!(task.await.unwrap().is_ok());
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let terminal = state.terminal.lock().await;
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assert_eq!(terminal.len(), 1);
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assert_eq!(terminal[0].status, TurnStatus::Completed);
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assert!(
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matches!(&terminal[0].blocks[0], TurnBlock::Assistant { text, .. } if text == "ab")
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);
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}
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#[tokio::test]
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|
async fn hidden_reasoning_is_removed_before_sink_and_failed_update_recovers() {
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let state = Arc::new(SinkState {
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fail_updates: AtomicUsize::new(1),
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..SinkState::default()
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});
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let (controller, emitter, receiver) = TurnController::start("session", "message");
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let coordinator = DeliveryCoordinator::for_test(Duration::from_secs(30), []);
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let task = tokio::spawn({
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let state = state.clone();
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async move {
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coordinator
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.deliver(
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|
"feishu",
|
|
"chat",
|
|
LivePolicy::Snapshot {
|
|
min_interval: Duration::ZERO,
|
|
},
|
|
PresentationPolicy::external(true),
|
|
receiver,
|
|
sink(state),
|
|
)
|
|
.await
|
|
}
|
|
});
|
|
|
|
emitter
|
|
.emit(TurnEvent::ReasoningDelta {
|
|
iteration: 0,
|
|
delta: "secret".into(),
|
|
})
|
|
.unwrap();
|
|
tokio::task::yield_now().await;
|
|
emitter
|
|
.emit(TurnEvent::TextDelta {
|
|
iteration: 0,
|
|
delta: "public".into(),
|
|
})
|
|
.unwrap();
|
|
tokio::task::yield_now().await;
|
|
controller.complete(None);
|
|
|
|
assert!(task.await.unwrap().is_ok());
|
|
let terminal = state.terminal.lock().await;
|
|
assert!(
|
|
terminal[0]
|
|
.blocks
|
|
.iter()
|
|
.all(|block| !matches!(block, TurnBlock::Reasoning { .. }))
|
|
);
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn final_only_skips_updates_and_retries_transient_finish() {
|
|
let state = Arc::new(SinkState {
|
|
fail_finish: AtomicUsize::new(2),
|
|
..SinkState::default()
|
|
});
|
|
let (controller, emitter, receiver) = TurnController::start("session", "message");
|
|
let coordinator = DeliveryCoordinator::for_test(
|
|
Duration::from_secs(30),
|
|
[Duration::from_millis(1), Duration::from_millis(2)],
|
|
);
|
|
let task = tokio::spawn({
|
|
let state = state.clone();
|
|
async move {
|
|
coordinator
|
|
.deliver(
|
|
"channel",
|
|
"chat",
|
|
LivePolicy::FinalOnly,
|
|
PresentationPolicy::unattended(),
|
|
receiver,
|
|
sink(state),
|
|
)
|
|
.await
|
|
}
|
|
});
|
|
|
|
emitter
|
|
.emit(TurnEvent::TextDelta {
|
|
iteration: 0,
|
|
delta: "done".into(),
|
|
})
|
|
.unwrap();
|
|
controller.complete(None);
|
|
|
|
assert!(task.await.unwrap().is_ok());
|
|
assert!(state.updates.lock().await.is_empty());
|
|
assert_eq!(state.terminal.lock().await.len(), 1);
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn open_and_deliver_owns_sink_creation_and_terminal_lifecycle() {
|
|
let state = Arc::new(SinkState::default());
|
|
let channel = Arc::new(SinkChannel {
|
|
state: state.clone(),
|
|
opened: AtomicUsize::new(0),
|
|
});
|
|
let (controller, emitter, receiver) = TurnController::start("session", "message");
|
|
let coordinator = DeliveryCoordinator::for_test(Duration::from_secs(30), []);
|
|
let target = TurnTarget {
|
|
channel: "sink-channel".into(),
|
|
chat_id: "chat".into(),
|
|
session_id: "session".into(),
|
|
reply_to: None,
|
|
metadata: HashMap::new(),
|
|
};
|
|
let task = tokio::spawn({
|
|
let channel = channel.clone();
|
|
async move {
|
|
coordinator
|
|
.open_and_deliver(channel, target, PresentationPolicy::unattended(), receiver)
|
|
.await
|
|
}
|
|
});
|
|
|
|
emitter
|
|
.emit(TurnEvent::TextDelta {
|
|
iteration: 0,
|
|
delta: "done".into(),
|
|
})
|
|
.unwrap();
|
|
controller.complete(None);
|
|
|
|
assert!(task.await.unwrap().is_ok());
|
|
assert_eq!(channel.opened.load(Ordering::SeqCst), 1);
|
|
assert_eq!(state.terminal.lock().await.len(), 1);
|
|
}
|
|
|
|
#[tokio::test]
|
|
async fn supervisor_shutdown_aborts_sink_and_waits_for_cleanup() {
|
|
let state = Arc::new(SinkState::default());
|
|
let (_controller, emitter, receiver) = TurnController::start("session", "message");
|
|
emitter
|
|
.emit(TurnEvent::TextDelta {
|
|
iteration: 0,
|
|
delta: "partial".into(),
|
|
})
|
|
.unwrap();
|
|
let supervisor = TaskSupervisor::new();
|
|
let coordinator = DeliveryCoordinator::for_test(Duration::from_secs(1), []);
|
|
let result = coordinator
|
|
.spawn_sink(
|
|
&supervisor,
|
|
SinkRoute {
|
|
channel: "channel".into(),
|
|
chat_id: "chat".into(),
|
|
live_policy: LivePolicy::FinalOnly,
|
|
presentation: PresentationPolicy::unattended(),
|
|
},
|
|
receiver,
|
|
sink(state.clone()),
|
|
)
|
|
.unwrap();
|
|
tokio::task::yield_now().await;
|
|
|
|
supervisor.shutdown(Duration::from_secs(1)).await;
|
|
|
|
assert!(result.await.unwrap().is_ok());
|
|
let terminal = state.terminal.lock().await;
|
|
assert_eq!(terminal.len(), 1);
|
|
assert_eq!(terminal[0].status, TurnStatus::Running);
|
|
}
|
|
}
|