File size: 4,977 Bytes
afa0cbf | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | use std::sync::Arc;
use codex_code_mode_protocol::grpc as proto;
use codex_code_mode_protocol::host::MAX_FRAME_BYTES;
use codex_code_mode_protocol::host::MAX_PENDING_DELEGATE_CALLS;
use prost::Message;
use tokio::sync::OwnedSemaphorePermit;
use tokio::sync::Semaphore;
use tokio::sync::TryAcquireError;
use tokio::sync::mpsc;
use tokio_util::sync::CancellationToken;
use tokio_util::task::TaskTracker;
use tonic::Status;
use crate::MAX_ACTIVE_CELLS;
const MAX_BUFFERED_CONTROL_EVENTS: usize = MAX_PENDING_DELEGATE_CALLS * 2 + MAX_ACTIVE_CELLS;
#[derive(Clone)]
pub(super) struct EventSender {
sender: mpsc::UnboundedSender<QueuedEvent>,
permits: Arc<Semaphore>,
closed: CancellationToken,
writer: TaskTracker,
}
struct QueuedEvent {
message: proto::SessionEvent,
_queue_permit: OwnedSemaphorePermit,
_cell_permit: Option<OwnedSemaphorePermit>,
}
impl EventSender {
pub(super) fn new(
output: mpsc::Sender<Result<proto::SessionEvent, Status>>,
closed: CancellationToken,
) -> Self {
let (sender, mut receiver) = mpsc::unbounded_channel::<QueuedEvent>();
let writer_closed = closed.clone();
let writer = TaskTracker::new();
writer.spawn(async move {
loop {
let event = tokio::select! {
_ = writer_closed.cancelled() => return,
event = receiver.recv() => match event {
Some(event) => event,
None => return,
},
};
let QueuedEvent {
message,
_queue_permit,
_cell_permit,
} = event;
tokio::select! {
_ = writer_closed.cancelled() => return,
result = output.send(Ok(message)) => {
if result.is_err() {
writer_closed.cancel();
return;
}
}
}
drop(_queue_permit);
drop(_cell_permit);
}
});
writer.close();
Self {
sender,
permits: Arc::new(Semaphore::new(MAX_BUFFERED_CONTROL_EVENTS)),
closed,
writer,
}
}
pub(super) async fn shutdown(&self) {
self.closed.cancel();
self.writer.wait().await;
}
pub(super) async fn send(
&self,
event: proto::session_event::Event,
cancellation: &CancellationToken,
) -> Result<(), String> {
let message = validate_event(event)?;
let permit = tokio::select! {
biased;
_ = self.closed.cancelled() => {
return Err("code-mode session event stream is closed".to_string());
}
_ = cancellation.cancelled() => {
return Err("code-mode session event was cancelled".to_string());
}
permit = Arc::clone(&self.permits).acquire_owned() => permit
.map_err(|_| "code-mode session event queue is closed".to_string())?,
};
self.enqueue(message, permit, /*cell_permit*/ None)
}
pub(super) fn send_now(
&self,
event: proto::session_event::Event,
cell_permit: Option<OwnedSemaphorePermit>,
) -> Result<(), String> {
let message = validate_event(event)?;
if self.closed.is_cancelled() {
return Err("code-mode session event stream is closed".to_string());
}
match Arc::clone(&self.permits).try_acquire_owned() {
Ok(permit) => self.enqueue(message, permit, cell_permit),
Err(TryAcquireError::NoPermits) => {
self.closed.cancel();
Err("code-mode session event queue is full".to_string())
}
Err(TryAcquireError::Closed) => {
self.closed.cancel();
Err("code-mode session event queue is closed".to_string())
}
}
}
fn enqueue(
&self,
message: proto::SessionEvent,
permit: OwnedSemaphorePermit,
cell_permit: Option<OwnedSemaphorePermit>,
) -> Result<(), String> {
self.sender
.send(QueuedEvent {
message,
_queue_permit: permit,
_cell_permit: cell_permit,
})
.map_err(|_| {
self.closed.cancel();
"code-mode session event stream is closed".to_string()
})
}
}
fn validate_event(event: proto::session_event::Event) -> Result<proto::SessionEvent, String> {
let message = proto::SessionEvent { event: Some(event) };
if message.encoded_len() > MAX_FRAME_BYTES {
return Err(format!(
"code-mode session event exceeds the {MAX_FRAME_BYTES}-byte gRPC message limit"
));
}
Ok(message)
}
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