File size: 8,117 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | use std::sync::Arc;
use std::sync::Mutex;
use std::sync::PoisonError;
use std::sync::atomic::AtomicU64;
use std::sync::atomic::Ordering;
use codex_code_mode_protocol::CellId;
use codex_code_mode_protocol::CodeModeSession;
use codex_code_mode_protocol::CodeModeSessionCellExecutionLimits;
use codex_code_mode_protocol::CodeModeSessionDelegate;
use codex_code_mode_protocol::CodeModeSessionResultFuture;
use codex_code_mode_protocol::ExecuteRequest;
use codex_code_mode_protocol::StartedCell;
use codex_code_mode_protocol::WaitOutcome;
use codex_code_mode_protocol::WaitRequest;
use tokio::sync::Semaphore;
use tokio::sync::watch;
use tokio_util::sync::CancellationToken;
use super::GrpcCodeModeSession;
use super::GrpcCodeModeSessionProvider;
use super::SHUTDOWN_ERROR;
use super::generation;
use super::generation::GenerationDelegate;
use crate::remote_session::ShutdownResultReceiver;
use crate::remote_session::wait_for_watch;
pub(super) struct ReconnectableSession {
inner: Arc<ReconnectInner>,
}
struct ReconnectInner {
provider: GrpcCodeModeSessionProvider,
limits: CodeModeSessionCellExecutionLimits,
binding: Mutex<Option<SessionBinding>>,
opening_permit: Semaphore,
next_generation: AtomicU64,
shutdown_requested: CancellationToken,
shutdown_result: Mutex<Option<ShutdownResultReceiver>>,
}
#[derive(Clone)]
struct SessionBinding {
session: Arc<GrpcCodeModeSession>,
generation: u64,
}
impl ReconnectableSession {
pub(super) fn new(
provider: GrpcCodeModeSessionProvider,
limits: CodeModeSessionCellExecutionLimits,
) -> Self {
Self {
inner: Arc::new(ReconnectInner {
provider,
limits,
binding: Mutex::new(None),
opening_permit: Semaphore::new(/*permits*/ 1),
next_generation: AtomicU64::new(1),
shutdown_requested: CancellationToken::new(),
shutdown_result: Mutex::new(None),
}),
}
}
pub(super) async fn initialize(&self) -> Result<(), String> {
self.inner.get_or_open_binding().await.map(|_| ())
}
}
impl CodeModeSession for ReconnectableSession {
fn execute<'a>(
&'a self,
request: ExecuteRequest,
delegate: Arc<dyn CodeModeSessionDelegate>,
) -> CodeModeSessionResultFuture<'a, StartedCell> {
Box::pin(async move {
let binding = self.inner.get_or_open_binding().await?;
let delegate = Arc::new(GenerationDelegate {
delegate,
generation: binding.generation,
});
let started = binding.session.execute(request, delegate).await?;
Ok(generation::public_started_cell(binding.generation, started))
})
}
fn wait<'a>(&'a self, request: WaitRequest) -> CodeModeSessionResultFuture<'a, WaitOutcome> {
Box::pin(async move {
let binding = self.inner.get_or_open_binding().await?;
let request = WaitRequest {
cell_id: generation::remote_cell_id(binding.generation, &request.cell_id)?,
yield_time_ms: request.yield_time_ms,
};
let outcome = binding.session.wait(request).await?;
Ok(generation::public_wait_outcome(binding.generation, outcome))
})
}
fn terminate<'a>(&'a self, cell_id: CellId) -> CodeModeSessionResultFuture<'a, WaitOutcome> {
Box::pin(async move {
let binding = self.inner.get_or_open_binding().await?;
let cell_id = generation::remote_cell_id(binding.generation, &cell_id)?;
let outcome = binding.session.terminate(cell_id).await?;
Ok(generation::public_wait_outcome(binding.generation, outcome))
})
}
fn shutdown<'a>(&'a self) -> CodeModeSessionResultFuture<'a, ()> {
Box::pin(wait_for_watch(self.inner.request_shutdown()))
}
}
impl Drop for ReconnectableSession {
fn drop(&mut self) {
if tokio::runtime::Handle::try_current().is_ok() {
self.inner.request_shutdown();
}
}
}
impl ReconnectInner {
async fn get_or_open_binding(&self) -> Result<SessionBinding, String> {
if self.shutdown_requested.is_cancelled() {
return Err(SHUTDOWN_ERROR.to_string());
}
if let Some(binding) = self.live_binding() {
return Ok(binding);
}
let _opening_permit = tokio::select! {
biased;
_ = self.shutdown_requested.cancelled() => {
return Err(SHUTDOWN_ERROR.to_string());
}
permit = self.opening_permit.acquire() => permit
.map_err(|_| "gRPC code-mode session opening coordinator closed".to_string())?,
};
if self.shutdown_requested.is_cancelled() {
return Err(SHUTDOWN_ERROR.to_string());
}
if let Some(binding) = self.live_binding() {
return Ok(binding);
}
let previous_binding = self
.binding
.lock()
.unwrap_or_else(PoisonError::into_inner)
.clone();
if let Some(binding) = previous_binding {
wait_for_watch(binding.session.inner.request_shutdown()).await?;
}
let generation = self.next_generation.fetch_add(1, Ordering::Relaxed);
let session = tokio::select! {
biased;
_ = self.shutdown_requested.cancelled() => {
return Err(SHUTDOWN_ERROR.to_string());
}
session = self.provider.open_binding(self.limits.clone()) => session?,
};
let binding = SessionBinding {
session,
generation,
};
let published = {
let mut current = self.binding.lock().unwrap_or_else(PoisonError::into_inner);
if self.shutdown_requested.is_cancelled() {
false
} else {
*current = Some(binding.clone());
true
}
};
if !published {
let _ = wait_for_watch(binding.session.inner.request_shutdown()).await;
return Err(SHUTDOWN_ERROR.to_string());
}
Ok(binding)
}
fn live_binding(&self) -> Option<SessionBinding> {
self.binding
.lock()
.unwrap_or_else(PoisonError::into_inner)
.as_ref()
.filter(|binding| !binding.session.inner.stopped.is_cancelled())
.cloned()
}
fn request_shutdown(self: &Arc<Self>) -> ShutdownResultReceiver {
{
let binding = self.binding.lock().unwrap_or_else(PoisonError::into_inner);
self.shutdown_requested.cancel();
if let Some(binding) = binding.as_ref() {
binding.session.inner.request_shutdown();
}
}
let mut result = self
.shutdown_result
.lock()
.unwrap_or_else(PoisonError::into_inner);
if let Some(receiver) = result.as_ref() {
return receiver.clone();
}
let (sender, receiver) = watch::channel(None);
*result = Some(receiver.clone());
let inner = Arc::clone(self);
tokio::spawn(async move {
let opening_permit = match inner.opening_permit.acquire().await {
Ok(permit) => permit,
Err(_) => {
sender.send_replace(Some(Err(
"gRPC code-mode session opening coordinator closed".to_string(),
)));
return;
}
};
let binding = inner
.binding
.lock()
.unwrap_or_else(PoisonError::into_inner)
.take();
drop(opening_permit);
let result = match binding {
Some(binding) => wait_for_watch(binding.session.inner.request_shutdown()).await,
None => Ok(()),
};
sender.send_replace(Some(result));
});
receiver
}
}
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