From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../rust/neqo-http3/src/control_stream_local.rs    | 107 +++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 third_party/rust/neqo-http3/src/control_stream_local.rs

(limited to 'third_party/rust/neqo-http3/src/control_stream_local.rs')

diff --git a/third_party/rust/neqo-http3/src/control_stream_local.rs b/third_party/rust/neqo-http3/src/control_stream_local.rs
new file mode 100644
index 0000000000..54c8282c2a
--- /dev/null
+++ b/third_party/rust/neqo-http3/src/control_stream_local.rs
@@ -0,0 +1,107 @@
+// 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::frames::HFrame;
+use crate::{BufferedStream, Http3StreamType, RecvStream, Res};
+use neqo_common::{qtrace, Encoder};
+use neqo_transport::{Connection, StreamId, StreamType};
+use std::collections::{HashMap, VecDeque};
+use std::convert::TryFrom;
+
+pub const HTTP3_UNI_STREAM_TYPE_CONTROL: u64 = 0x0;
+
+/// The local control stream, responsible for encoding frames and sending them
+#[derive(Debug)]
+pub(crate) struct ControlStreamLocal {
+    stream: BufferedStream,
+    /// `stream_id`s of outstanding request streams
+    outstanding_priority_update: VecDeque<StreamId>,
+}
+
+impl ::std::fmt::Display for ControlStreamLocal {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        write!(f, "Local control stream {:?}", self.stream)
+    }
+}
+
+impl ControlStreamLocal {
+    pub fn new() -> Self {
+        Self {
+            stream: BufferedStream::default(),
+            outstanding_priority_update: VecDeque::new(),
+        }
+    }
+
+    /// Add a new frame that needs to be send.
+    pub fn queue_frame(&mut self, f: &HFrame) {
+        let mut enc = Encoder::default();
+        f.encode(&mut enc);
+        self.stream.buffer(enc.as_ref());
+    }
+
+    pub fn queue_update_priority(&mut self, stream_id: StreamId) {
+        self.outstanding_priority_update.push_back(stream_id);
+    }
+
+    /// Send control data if available.
+    pub fn send(
+        &mut self,
+        conn: &mut Connection,
+        recv_conn: &mut HashMap<StreamId, Box<dyn RecvStream>>,
+    ) -> Res<()> {
+        self.stream.send_buffer(conn)?;
+        self.send_priority_update(conn, recv_conn)
+    }
+
+    fn send_priority_update(
+        &mut self,
+        conn: &mut Connection,
+        recv_conn: &mut HashMap<StreamId, Box<dyn RecvStream>>,
+    ) -> Res<()> {
+        // send all necessary priority updates
+        while let Some(update_id) = self.outstanding_priority_update.pop_front() {
+            let update_stream = match recv_conn.get_mut(&update_id) {
+                Some(update_stream) => update_stream,
+                None => continue,
+            };
+
+            // can assert and unwrap here, because priority updates can only be added to
+            // HttpStreams in [Http3Connection::queue_update_priority}
+            debug_assert!(matches!(
+                update_stream.stream_type(),
+                Http3StreamType::Http | Http3StreamType::Push
+            ));
+            let stream = update_stream.http_stream().unwrap();
+
+            // in case multiple priority_updates were issued, ignore now irrelevant
+            if let Some(hframe) = stream.priority_update_frame() {
+                let mut enc = Encoder::new();
+                hframe.encode(&mut enc);
+                if self.stream.send_atomic(conn, enc.as_ref())? {
+                    stream.priority_update_sent();
+                } else {
+                    self.outstanding_priority_update.push_front(update_id);
+                    break;
+                }
+            }
+        }
+        Ok(())
+    }
+
+    /// Create a control stream.
+    pub fn create(&mut self, conn: &mut Connection) -> Res<()> {
+        qtrace!([self], "Create a control stream.");
+        self.stream.init(conn.stream_create(StreamType::UniDi)?);
+        self.stream
+            .buffer(&[u8::try_from(HTTP3_UNI_STREAM_TYPE_CONTROL).unwrap()]);
+        Ok(())
+    }
+
+    #[must_use]
+    pub fn stream_id(&self) -> Option<StreamId> {
+        (&self.stream).into()
+    }
+}
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