File size: 7,615 Bytes
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use bytes::Bytes;
use codex_http_client::HttpClientFactory;
use codex_websocket_client::WebSocketConnector;
use futures::Sink;
use futures::SinkExt;
use futures::StreamExt;
use tokio::time::timeout;
use tokio_tungstenite::tungstenite::Message;
use tokio_tungstenite::tungstenite::client::IntoClientRequest;
use tokio_tungstenite::tungstenite::protocol::WebSocketConfig;
use tokio_tungstenite::tungstenite::protocol::frame::Frame;
use tokio_tungstenite::tungstenite::protocol::frame::coding::Data;
use tokio_tungstenite::tungstenite::protocol::frame::coding::OpCode;
use tokio_util::task::AbortOnDropHandle;
use tracing::warn;
use crate::ExecServerError;
use crate::ExecServerTelemetry;
use crate::client_api::DEFAULT_REMOTE_EXEC_SERVER_CONNECT_TIMEOUT;
use crate::noise_relay::message_framing::MAX_NOISE_JSONRPC_MESSAGE_LEN;
use crate::noise_relay::message_framing::frame_message;
use crate::noise_relay::stream_handler::NoiseOutboundMessage;
use crate::noise_relay::stream_handler::NoiseStreamConnection;
use crate::noise_relay::stream_handler::NoiseStreamHandler;
use crate::telemetry::ConnectionTransport;
// Existing exec-server listeners accept 64 MiB messages but only 16 MiB frames.
const WEBSOCKET_FRAGMENT_LEN: usize = 8 * 1024 * 1024;
const WEBSOCKET_CLOSE_TIMEOUT: Duration = Duration::from_secs(1);
async fn send_websocket_message<S>(websocket: &mut S, mut payload: Bytes) -> Result<(), S::Error>
where
S: Sink<Message> + Unpin,
{
if payload.len() <= WEBSOCKET_FRAGMENT_LEN {
return websocket.send(Message::Binary(payload)).await;
}
let mut opcode = OpCode::Data(Data::Binary);
while !payload.is_empty() {
let chunk = payload.split_to(payload.len().min(WEBSOCKET_FRAGMENT_LEN));
let is_final = payload.is_empty();
websocket
.send(Message::Frame(Frame::message(chunk, opcode, is_final)))
.await?;
opcode = OpCode::Data(Data::Continue);
}
Ok(())
}
/// Copies authenticated remote messages to an independently owned executor.
#[derive(Clone)]
pub(crate) struct Forwarder {
websocket_url: String,
connector: WebSocketConnector,
telemetry: ExecServerTelemetry,
}
impl Forwarder {
pub(crate) fn new(
websocket_url: String,
http_client_factory: &HttpClientFactory,
telemetry: ExecServerTelemetry,
) -> Result<Self, ExecServerError> {
let url = url::Url::parse(&websocket_url)
.map_err(|error| ExecServerError::WebSocketConfiguration(error.to_string()))?;
if !matches!(url.scheme(), "ws" | "wss") || url.host_str().is_none() {
return Err(ExecServerError::WebSocketConfiguration(
"forward destination must be a ws:// or wss:// URL".to_string(),
));
}
let connector = WebSocketConnector::new(http_client_factory)
.map_err(|error| ExecServerError::WebSocketConfiguration(error.to_string()))?
.with_tcp_nodelay();
Ok(Self {
websocket_url,
connector,
telemetry,
})
}
pub(crate) async fn run_connection(self, mut remote: NoiseStreamConnection<Bytes, Bytes>) {
let mut writer_task = AbortOnDropHandle::new(remote.writer_task);
let _metrics = self
.telemetry
.connection_started(ConnectionTransport::Relay);
let connect = async {
let request = self.websocket_url.as_str().into_client_request()?;
self.connector
.connect(
request,
WebSocketConfig::default()
.max_message_size(Some(MAX_NOISE_JSONRPC_MESSAGE_LEN))
.max_frame_size(Some(MAX_NOISE_JSONRPC_MESSAGE_LEN)),
)
.await
};
let connected = tokio::select! {
biased;
_ = remote.disconnected_rx.wait_for(|disconnected| *disconnected) => None,
result = timeout(DEFAULT_REMOTE_EXEC_SERVER_CONNECT_TIMEOUT, connect) => {
match result {
Ok(Ok((websocket, _))) => Some(websocket),
Ok(Err(_)) => {
warn!("failed to connect to forwarded exec-server");
None
}
Err(_) => {
warn!("timed out connecting to forwarded exec-server");
None
}
}
}
};
let drain_outgoing = if let Some(websocket) = connected {
let (mut destination_tx, mut destination_rx) = websocket.split();
let to_destination = async {
while let Some(payload) = remote.incoming_rx.recv().await {
if send_websocket_message(&mut destination_tx, payload)
.await
.is_err()
{
break;
}
}
};
let from_destination = async {
while let Some(Ok(message)) = destination_rx.next().await {
let payload = match message {
Message::Text(_) | Message::Binary(_) => message.into_data(),
Message::Close(_) => return true,
Message::Ping(_) | Message::Pong(_) | Message::Frame(_) => continue,
};
if remote.outgoing_tx.send(payload).await.is_err() {
break;
}
}
false
};
let (drain_outgoing, received_close) = tokio::select! {
_ = remote.disconnected_rx.wait_for(|disconnected| *disconnected) => (false, false),
_ = to_destination => (false, false),
received_close = from_destination => (true, received_close),
};
if received_close && let Ok(mut websocket) = destination_tx.reunite(destination_rx) {
// Reuniting drops any canceled application send before flushing
// Tungstenite's automatically queued Close acknowledgement.
tokio::select! {
_ = timeout(WEBSOCKET_CLOSE_TIMEOUT, websocket.flush()) => {},
_ = remote.disconnected_rx.wait_for(|disconnected| *disconnected) => {},
}
}
drain_outgoing
} else {
false
};
// Preserve messages received before the destination's Close. Never wait
// for a dead remote, and let owner shutdown interrupt a blocked drain.
drop(remote.outgoing_tx);
if drain_outgoing {
tokio::select! {
_ = &mut writer_task => return,
_ = remote.disconnected_rx.wait_for(|disconnected| *disconnected) => {},
}
}
writer_task.abort();
let _ = writer_task.await;
}
}
impl NoiseStreamHandler for Forwarder {
type Incoming = Bytes;
type Outgoing = Bytes;
fn decode(payload: Bytes) -> Result<Bytes, ExecServerError> {
Ok(payload)
}
fn encode(payload: Bytes) -> Result<NoiseOutboundMessage, ExecServerError> {
Ok(NoiseOutboundMessage {
framed: frame_message(&payload)?,
trace: None,
})
}
async fn run_connection(self, connection: NoiseStreamConnection<Bytes, Bytes>) {
Forwarder::run_connection(self, connection).await;
}
}
#[cfg(test)]
#[path = "forward_tests.rs"]
mod tests;
|