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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::{rc::Rc, time::Instant};
use neqo_common::{event::Provider, qdebug, qinfo, qtrace, Header, MessageType, Role};
use neqo_transport::{
AppError, Connection, ConnectionEvent, DatagramTracking, StreamId, StreamType,
};
use crate::{
connection::{Http3Connection, Http3State, WebTransportSessionAcceptAction},
frames::HFrame,
recv_message::{RecvMessage, RecvMessageInfo},
send_message::SendMessage,
server_connection_events::{Http3ServerConnEvent, Http3ServerConnEvents},
Error, Http3Parameters, Http3StreamType, NewStreamType, Priority, PriorityHandler,
ReceiveOutput, Res,
};
#[derive(Debug)]
pub struct Http3ServerHandler {
base_handler: Http3Connection,
events: Http3ServerConnEvents,
needs_processing: bool,
}
impl ::std::fmt::Display for Http3ServerHandler {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
write!(f, "Http3 server connection")
}
}
impl Http3ServerHandler {
pub(crate) fn new(http3_parameters: Http3Parameters) -> Self {
Self {
base_handler: Http3Connection::new(http3_parameters, Role::Server),
events: Http3ServerConnEvents::default(),
needs_processing: false,
}
}
#[must_use]
pub fn state(&self) -> Http3State {
self.base_handler.state()
}
/// Supply a response for a request.
///
/// # Errors
///
/// `InvalidStreamId` if the stream does not exist,
/// `AlreadyClosed` if the stream has already been closed.
/// `TransportStreamDoesNotExist` if the transport stream does not exist (this may happen if
/// `process_output` has not been called when needed, and HTTP3 layer has not picked up the
/// info that the stream has been closed.) `InvalidInput` if an empty buffer has been
/// supplied.
pub(crate) fn send_data(
&mut self,
stream_id: StreamId,
data: &[u8],
conn: &mut Connection,
) -> Res<usize> {
let n = self
.base_handler
.send_streams
.get_mut(&stream_id)
.ok_or(Error::InvalidStreamId)?
.send_data(conn, data)?;
if n > 0 {
self.base_handler.stream_has_pending_data(stream_id);
}
self.needs_processing = true;
Ok(n)
}
/// Supply response heeaders for a request.
pub(crate) fn send_headers(
&mut self,
stream_id: StreamId,
headers: &[Header],
conn: &mut Connection,
) -> Res<()> {
self.base_handler
.send_streams
.get_mut(&stream_id)
.ok_or(Error::InvalidStreamId)?
.http_stream()
.ok_or(Error::InvalidStreamId)?
.send_headers(headers, conn)?;
self.base_handler.stream_has_pending_data(stream_id);
self.needs_processing = true;
Ok(())
}
/// This is called when application is done sending a request.
///
/// # Errors
///
/// An error will be returned if stream does not exist.
pub fn stream_close_send(&mut self, stream_id: StreamId, conn: &mut Connection) -> Res<()> {
qdebug!([self], "Close sending side stream={}.", stream_id);
self.base_handler.stream_close_send(conn, stream_id)?;
self.needs_processing = true;
Ok(())
}
/// An application may reset a stream(request).
/// Both sides, sending and receiving side, will be closed.
///
/// # Errors
///
/// An error will be return if a stream does not exist.
pub fn cancel_fetch(
&mut self,
stream_id: StreamId,
error: AppError,
conn: &mut Connection,
) -> Res<()> {
qinfo!([self], "cancel_fetch {} error={}.", stream_id, error);
self.needs_processing = true;
self.base_handler.cancel_fetch(stream_id, error, conn)
}
pub fn stream_stop_sending(
&mut self,
stream_id: StreamId,
error: AppError,
conn: &mut Connection,
) -> Res<()> {
qinfo!([self], "stream_stop_sending {} error={}.", stream_id, error);
self.needs_processing = true;
self.base_handler
.stream_stop_sending(conn, stream_id, error)
}
pub fn stream_reset_send(
&mut self,
stream_id: StreamId,
error: AppError,
conn: &mut Connection,
) -> Res<()> {
qinfo!([self], "stream_reset_send {} error={}.", stream_id, error);
self.needs_processing = true;
self.base_handler.stream_reset_send(conn, stream_id, error)
}
/// Accept a `WebTransport` Session request
pub(crate) fn webtransport_session_accept(
&mut self,
conn: &mut Connection,
stream_id: StreamId,
accept: &WebTransportSessionAcceptAction,
) -> Res<()> {
self.needs_processing = true;
self.base_handler.webtransport_session_accept(
conn,
stream_id,
Box::new(self.events.clone()),
accept,
)
}
/// Close `WebTransport` cleanly
///
/// # Errors
///
/// `InvalidStreamId` if the stream does not exist,
/// `TransportStreamDoesNotExist` if the transport stream does not exist (this may happen if
/// `process_output` has not been called when needed, and HTTP3 layer has not picked up the
/// info that the stream has been closed.) `InvalidInput` if an empty buffer has been
/// supplied.
pub fn webtransport_close_session(
&mut self,
conn: &mut Connection,
session_id: StreamId,
error: u32,
message: &str,
) -> Res<()> {
self.needs_processing = true;
self.base_handler
.webtransport_close_session(conn, session_id, error, message)
}
pub fn webtransport_create_stream(
&mut self,
conn: &mut Connection,
session_id: StreamId,
stream_type: StreamType,
) -> Res<StreamId> {
self.needs_processing = true;
self.base_handler.webtransport_create_stream_local(
conn,
session_id,
stream_type,
Box::new(self.events.clone()),
Box::new(self.events.clone()),
)
}
pub fn webtransport_send_datagram(
&mut self,
conn: &mut Connection,
session_id: StreamId,
buf: &[u8],
id: impl Into<DatagramTracking>,
) -> Res<()> {
self.needs_processing = true;
self.base_handler
.webtransport_send_datagram(session_id, conn, buf, id)
}
/// Process HTTTP3 layer.
pub fn process_http3(&mut self, conn: &mut Connection, now: Instant) {
qtrace!([self], "Process http3 internal.");
if matches!(self.base_handler.state(), Http3State::Closed(..)) {
return;
}
let res = self.check_connection_events(conn, now);
if !self.check_result(conn, now, &res) && self.base_handler.state().active() {
let res = self.base_handler.process_sending(conn);
self.check_result(conn, now, &res);
}
}
/// Take the next available event.
pub(crate) fn next_event(&mut self) -> Option<Http3ServerConnEvent> {
self.events.next_event()
}
/// Whether this connection has events to process or data to send.
pub(crate) fn should_be_processed(&mut self) -> bool {
if self.needs_processing {
self.needs_processing = false;
return true;
}
self.base_handler.has_data_to_send() || self.events.has_events()
}
// This function takes the provided result and check for an error.
// An error results in closing the connection.
fn check_result<ERR>(&mut self, conn: &mut Connection, now: Instant, res: &Res<ERR>) -> bool {
match &res {
Err(e) => {
self.close(conn, now, e);
true
}
_ => false,
}
}
fn close(&mut self, conn: &mut Connection, now: Instant, err: &Error) {
qinfo!([self], "Connection error: {}.", err);
conn.close(now, err.code(), &format!("{err}"));
self.base_handler.close(err.code());
self.events
.connection_state_change(self.base_handler.state());
}
// If this return an error the connection must be closed.
fn check_connection_events(&mut self, conn: &mut Connection, now: Instant) -> Res<()> {
qtrace!([self], "Check connection events.");
while let Some(e) = conn.next_event() {
qdebug!([self], "check_connection_events - event {e:?}.");
match e {
ConnectionEvent::NewStream { stream_id } => {
self.base_handler.add_new_stream(stream_id);
}
ConnectionEvent::RecvStreamReadable { stream_id } => {
self.handle_stream_readable(conn, stream_id)?;
}
ConnectionEvent::RecvStreamReset {
stream_id,
app_error,
} => {
self.base_handler
.handle_stream_reset(stream_id, app_error, conn)?;
}
ConnectionEvent::SendStreamStopSending {
stream_id,
app_error,
} => self
.base_handler
.handle_stream_stop_sending(stream_id, app_error, conn)?,
ConnectionEvent::StateChange(state) => {
if self.base_handler.handle_state_change(conn, &state)? {
if self.base_handler.state() == Http3State::Connected {
let settings = self.base_handler.save_settings();
conn.send_ticket(now, &settings)?;
}
self.events
.connection_state_change(self.base_handler.state());
}
}
ConnectionEvent::SendStreamWritable { stream_id } => {
if let Some(s) = self.base_handler.send_streams.get_mut(&stream_id) {
s.stream_writable();
}
}
ConnectionEvent::Datagram(dgram) => self.base_handler.handle_datagram(&dgram),
ConnectionEvent::AuthenticationNeeded
| ConnectionEvent::EchFallbackAuthenticationNeeded { .. }
| ConnectionEvent::ZeroRttRejected
| ConnectionEvent::ResumptionToken(..) => return Err(Error::HttpInternal(4)),
ConnectionEvent::SendStreamComplete { .. }
| ConnectionEvent::SendStreamCreatable { .. }
| ConnectionEvent::OutgoingDatagramOutcome { .. }
| ConnectionEvent::IncomingDatagramDropped => {}
}
}
Ok(())
}
fn handle_stream_readable(&mut self, conn: &mut Connection, stream_id: StreamId) -> Res<()> {
match self.base_handler.handle_stream_readable(conn, stream_id)? {
ReceiveOutput::NewStream(NewStreamType::Push(_)) => Err(Error::HttpStreamCreation),
ReceiveOutput::NewStream(NewStreamType::Http) => {
self.base_handler.add_streams(
stream_id,
Box::new(SendMessage::new(
MessageType::Response,
Http3StreamType::Http,
stream_id,
self.base_handler.qpack_encoder.clone(),
Box::new(self.events.clone()),
)),
Box::new(RecvMessage::new(
&RecvMessageInfo {
message_type: MessageType::Request,
stream_type: Http3StreamType::Http,
stream_id,
header_frame_type_read: true,
},
Rc::clone(&self.base_handler.qpack_decoder),
Box::new(self.events.clone()),
None,
PriorityHandler::new(false, Priority::default()),
)),
);
let res = self.base_handler.handle_stream_readable(conn, stream_id)?;
assert_eq!(ReceiveOutput::NoOutput, res);
Ok(())
}
ReceiveOutput::NewStream(NewStreamType::WebTransportStream(session_id)) => {
self.base_handler.webtransport_create_stream_remote(
StreamId::from(session_id),
stream_id,
Box::new(self.events.clone()),
Box::new(self.events.clone()),
)?;
let res = self.base_handler.handle_stream_readable(conn, stream_id)?;
assert_eq!(ReceiveOutput::NoOutput, res);
Ok(())
}
ReceiveOutput::ControlFrames(control_frames) => {
for f in control_frames {
match f {
HFrame::MaxPushId { .. } => {
// TODO implement push
Ok(())
}
HFrame::Goaway { .. } | HFrame::CancelPush { .. } => {
Err(Error::HttpFrameUnexpected)
}
HFrame::PriorityUpdatePush { element_id, priority } => {
// TODO: check if the element_id references a promised push stream or
// is greater than the maximum Push ID.
self.events.priority_update(StreamId::from(element_id), priority);
Ok(())
}
HFrame::PriorityUpdateRequest { element_id, priority } => {
// check that the element_id references a request stream
// within the client-sided bidirectional stream limit
let element_stream_id = StreamId::new(element_id);
if !element_stream_id.is_bidi()
|| !element_stream_id.is_client_initiated()
|| !conn.is_stream_id_allowed(element_stream_id)
{
return Err(Error::HttpId)
}
self.events.priority_update(element_stream_id, priority);
Ok(())
}
_ => unreachable!(
"we should only put MaxPushId, Goaway and PriorityUpdates into control_frames."
),
}?;
}
Ok(())
}
_ => Ok(()),
}
}
/// Response data are read directly into a buffer supplied as a parameter of this function to
/// avoid copying data.
///
/// # Errors
///
/// It returns an error if a stream does not exist or an error happen while reading a stream,
/// e.g. early close, protocol error, etc.
pub fn read_data(
&mut self,
conn: &mut Connection,
now: Instant,
stream_id: StreamId,
buf: &mut [u8],
) -> Res<(usize, bool)> {
qdebug!([self], "read_data from stream {}.", stream_id);
let res = self.base_handler.read_data(conn, stream_id, buf);
if let Err(e) = &res {
if e.connection_error() {
self.close(conn, now, e);
}
}
res
}
}