use super::*;
mod drain;
mod event_loop;
mod forward;
mod upload;
use event_loop::H3Loop;
pub(super) use forward::*;
pub(super) use upload::*;
const GOAWAY_NOT_SENT: &str = "server sent GOAWAY: request not sent";
struct Drain<'a> {
h3: &'a mut quiche::h3::Connection,
conn: &'a mut quiche::Connection,
streams: &'a mut HashMap<u64, H3Stream>,
pending: &'a mut VecDeque<H3Command>,
scratch: &'a mut [u8],
max_body: u64,
admit: &'a mut Option<usize>,
draining: bool,
}
impl H3Driver {
pub(super) async fn run(self) {
let mut event_loop = H3Loop::new(self);
while event_loop.turn().await.is_continue() {}
}
}
pub(super) fn start_pending(
h3: &mut quiche::h3::Connection,
conn: &mut quiche::Connection,
streams: &mut HashMap<u64, H3Stream>,
pending: &mut VecDeque<H3Command>,
body_chunk_tx: &mpsc::Sender<H3BodyChunk>,
admit_cap: Option<usize>,
priority_update: bool,
) {
while let Some(cmd) = pending.front() {
if command_is_cancelled(cmd) {
drop(pending.pop_front());
continue;
}
let H3Command::Request {
headers,
body,
body_stream,
retried,
..
} = cmd;
if admit_cap.is_some_and(|cap| streams.len() >= cap) {
break;
}
let streaming = body_stream.is_some();
let fin = !streaming && body.as_ref().is_none_or(Bytes::is_empty);
let retry = (!streaming && !*retried).then(|| (headers.clone(), body.clone()));
let expects_body = !headers
.iter()
.any(|h| h.name() == b":method" && h.value() == b"HEAD");
let priority = priority_update
.then(|| headers.iter().find(|h| h.name() == b"priority"))
.flatten()
.map(|h| h.value().to_vec());
match h3.send_request(conn, headers, fin) {
Ok(stream_id) => {
send_priority_update(h3, conn, stream_id, priority);
let Some(H3Command::Request {
body,
body_stream,
stream_body_tx,
mode,
resp_tx,
..
}) = pending.pop_front()
else {
unreachable!("front matched Request above");
};
let mut stream = H3Stream::new(resp_tx, body, stream_body_tx, streaming);
stream.mode = mode;
stream.retry = retry;
stream.expects_body = expects_body;
if let Some(body_stream) = body_stream {
let credit = crate::util::upload::upload_credit();
let pump = tokio::spawn(crate::util::upload::pump_request_body(
stream_id,
body_stream,
body_chunk_tx.clone(),
Arc::clone(&credit),
));
stream.upload_credit = Some(credit);
stream.pump = Some(pump.abort_handle());
}
if !write_request_body(h3, conn, stream_id, &mut stream) {
streams.insert(stream_id, stream);
}
}
Err(quiche::h3::Error::StreamBlocked)
| Err(quiche::h3::Error::Done)
| Err(quiche::h3::Error::TransportError(quiche::Error::StreamLimit)) => break,
Err(e) => {
if let Some(H3Command::Request { resp_tx, .. }) = pending.pop_front() {
drop(resp_tx.send(Err(H3SendError::Failed(format!("h3 send_request: {e}")))));
}
}
}
}
}
fn send_priority_update(
h3: &mut quiche::h3::Connection,
conn: &mut quiche::Connection,
stream_id: u64,
priority: Option<Vec<u8>>,
) {
if let Some(value) = priority
&& let Err(e) = h3.send_priority_update_field_value(conn, stream_id, &value)
{
tracing::debug!(
target: "leyline::quic",
stream_id,
error = %e,
"h3 PRIORITY_UPDATE not sent"
);
}
}
fn shutdown(
conn: &mut quiche::Connection,
id: u64,
dir: quiche::Shutdown,
code: quiche::h3::WireErrorCode,
) {
match conn.stream_shutdown(id, dir, code as u64) {
Ok(()) | Err(quiche::Error::Done) => {}
Err(e) => tracing::warn!(
target: "leyline::quic",
stream_id = id,
error = %e,
"h3 stream shutdown failed"
),
}
}
fn reset_upload_half(
conn: &mut quiche::Connection,
stream_id: u64,
stream: &mut H3Stream,
code: quiche::h3::WireErrorCode,
) {
if stream.send_side_open() {
shutdown(conn, stream_id, quiche::Shutdown::Write, code);
}
stream.cancel_upload();
}
fn abort_stream(
h3: &mut quiche::h3::Connection,
conn: &mut quiche::Connection,
stream_id: u64,
stream: &mut H3Stream,
code: quiche::h3::WireErrorCode,
) {
h3.cancel_stream(stream_id);
shutdown(conn, stream_id, quiche::Shutdown::Read, code);
reset_upload_half(conn, stream_id, stream, code);
}
fn stream_reset_message(code: u64) -> String {
format!("h3 stream reset: {code}")
}
fn on_body_read_error(
h3: &mut quiche::h3::Connection,
conn: &mut quiche::Connection,
stream_id: u64,
stream: &mut H3Stream,
error: quiche::h3::Error,
) -> String {
match error {
quiche::h3::Error::TransportError(quiche::Error::StreamReset(code)) => {
reset_upload_half(
conn,
stream_id,
stream,
quiche::h3::WireErrorCode::RequestCancelled,
);
stream_reset_message(code)
}
_ => {
abort_stream(
h3,
conn,
stream_id,
stream,
quiche::h3::WireErrorCode::GeneralProtocolError,
);
format!("h3 recv_body: {error}")
}
}
}
fn caller_gone(
resp_tx: Option<&oneshot::Sender<Result<H3Response, H3SendError>>>,
stream_tx: Option<&mpsc::Sender<std::io::Result<Bytes>>>,
) -> bool {
match resp_tx {
Some(tx) => tx.is_closed(),
None => stream_tx.is_some_and(mpsc::Sender::is_closed),
}
}
pub(super) fn stream_is_cancelled(stream: &H3Stream) -> bool {
caller_gone(stream.resp_tx.as_ref(), stream.stream_tx.as_ref())
}
pub(super) fn command_is_cancelled(cmd: &H3Command) -> bool {
let H3Command::Request { resp_tx, .. } = cmd;
caller_gone(Some(resp_tx), None)
}
pub(super) fn cancelled_stream_ids(streams: &HashMap<u64, H3Stream>) -> Vec<u64> {
streams
.iter()
.filter(|(_, s)| stream_is_cancelled(s))
.map(|(&id, _)| id)
.collect()
}
pub(super) fn sweep_cancelled_streams(
h3: &mut quiche::h3::Connection,
conn: &mut quiche::Connection,
streams: &mut HashMap<u64, H3Stream>,
pending: &mut VecDeque<H3Command>,
) {
pending.retain(|cmd| !command_is_cancelled(cmd));
for id in cancelled_stream_ids(streams) {
if let Some(mut stream) = streams.remove(&id) {
abort_stream(
h3,
conn,
id,
&mut stream,
quiche::h3::WireErrorCode::RequestCancelled,
);
}
}
}
pub(super) fn fail_all(
streams: &mut HashMap<u64, H3Stream>,
pending: &mut VecDeque<H3Command>,
commands: &mut mpsc::Receiver<H3Command>,
closed: &AtomicBool,
reason: String,
) {
closed.store(true, Ordering::Release);
commands.close();
while let Ok(cmd) = commands.try_recv() {
pending.push_back(cmd);
}
for (_, mut stream) in streams.drain() {
stream.deliver_error(reason.clone());
}
for cmd in pending.drain(..) {
reject_unsent(cmd, reason.clone());
}
}
fn reject_unsent(cmd: H3Command, reason: String) {
let H3Command::Request { resp_tx, .. } = cmd;
drop(resp_tx.send(Err(H3SendError::NotSent(reason))));
}