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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::hframe::{HFrame, HFrameReader};
use crate::{Error, Res};
use neqo_common::{qdebug, qinfo};
use neqo_transport::Connection;
/// The remote control stream is responsible only for reading frames. The frames are handled by `Http3Connection`.
#[derive(Debug)]
pub(crate) struct ControlStreamRemote {
stream_id: Option<u64>,
frame_reader: HFrameReader,
fin: bool,
}
impl ::std::fmt::Display for ControlStreamRemote {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "Http3 remote control stream {:?}", self.stream_id)
}
}
impl ControlStreamRemote {
pub fn new() -> Self {
Self {
stream_id: None,
frame_reader: HFrameReader::new(),
fin: false,
}
}
/// A remote control stream has been received. Inform `ControlStreamRemote`.
pub fn add_remote_stream(&mut self, stream_id: u64) -> Res<()> {
qinfo!([self], "A new control stream {}.", stream_id);
if self.stream_id.is_some() {
qdebug!([self], "A control stream already exists");
return Err(Error::HttpStreamCreation);
}
self.stream_id = Some(stream_id);
Ok(())
}
/// Check if `stream_id` is the remote control stream.
pub fn is_recv_stream(&self, stream_id: u64) -> bool {
matches!(self.stream_id, Some(id) if id == stream_id)
}
/// Check if a stream is the control stream and read received data.
pub fn receive(&mut self, conn: &mut Connection) -> Res<Option<HFrame>> {
assert!(self.stream_id.is_some());
qdebug!([self], "Receiving data.");
match self.frame_reader.receive(conn, self.stream_id.unwrap())? {
(_, true) => {
self.fin = true;
Err(Error::HttpClosedCriticalStream)
}
(s, false) => Ok(s),
}
}
#[must_use]
pub fn stream_id(&self) -> Option<u64> {
self.stream_id
}
}
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