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//! HTTP/2 Server Connections
use std::error::Error as StdError;
use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::task::{Context, Poll};
use std::time::Duration;
use crate::rt::{Read, Write};
use futures_util::ready;
use pin_project_lite::pin_project;
use crate::body::{Body, Incoming as IncomingBody};
use crate::proto;
use crate::rt::bounds::Http2ServerConnExec;
use crate::service::HttpService;
use crate::{common::time::Time, rt::Timer};
pin_project! {
/// A [`Future`](core::future::Future) representing an HTTP/2 connection, bound to a
/// [`Service`](crate::service::Service), returned from
/// [`Builder::serve_connection`](struct.Builder.html#method.serve_connection).
///
/// To drive HTTP on this connection this future **must be polled**, typically with
/// `.await`. If it isn't polled, no progress will be made on this connection.
#[must_use = "futures do nothing unless polled"]
pub struct Connection<T, S, E>
where
S: HttpService<IncomingBody>,
{
conn: proto::h2::Server<T, S, S::ResBody, E>,
}
}
/// A configuration builder for HTTP/2 server connections.
///
/// **Note**: The default values of options are *not considered stable*. They
/// are subject to change at any time.
#[derive(Clone, Debug)]
pub struct Builder<E> {
exec: E,
timer: Time,
h2_builder: proto::h2::server::Config,
}
// ===== impl Connection =====
impl<I, S, E> fmt::Debug for Connection<I, S, E>
where
S: HttpService<IncomingBody>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Connection").finish()
}
}
impl<I, B, S, E> Connection<I, S, E>
where
S: HttpService<IncomingBody, ResBody = B>,
S::Error: Into<Box<dyn StdError + Send + Sync>>,
I: Read + Write + Unpin,
B: Body + 'static,
B::Error: Into<Box<dyn StdError + Send + Sync>>,
E: Http2ServerConnExec<S::Future, B>,
{
/// Start a graceful shutdown process for this connection.
///
/// This `Connection` should continue to be polled until shutdown
/// can finish.
///
/// # Note
///
/// This should only be called while the `Connection` future is still
/// pending. If called after `Connection::poll` has resolved, this does
/// nothing.
pub fn graceful_shutdown(mut self: Pin<&mut Self>) {
self.conn.graceful_shutdown();
}
}
impl<I, B, S, E> Future for Connection<I, S, E>
where
S: HttpService<IncomingBody, ResBody = B>,
S::Error: Into<Box<dyn StdError + Send + Sync>>,
I: Read + Write + Unpin,
B: Body + 'static,
B::Error: Into<Box<dyn StdError + Send + Sync>>,
E: Http2ServerConnExec<S::Future, B>,
{
type Output = crate::Result<()>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
match ready!(Pin::new(&mut self.conn).poll(cx)) {
Ok(_done) => {
//TODO: the proto::h2::Server no longer needs to return
//the Dispatched enum
Poll::Ready(Ok(()))
}
Err(e) => Poll::Ready(Err(e)),
}
}
}
// ===== impl Builder =====
impl<E> Builder<E> {
/// Create a new connection builder.
///
/// This starts with the default options, and an executor which is a type
/// that implements [`Http2ServerConnExec`] trait.
///
/// [`Http2ServerConnExec`]: crate::rt::bounds::Http2ServerConnExec
pub fn new(exec: E) -> Self {
Self {
exec,
timer: Time::Empty,
h2_builder: Default::default(),
}
}
/// Configures the maximum number of pending reset streams allowed before a GOAWAY will be sent.
///
/// This will default to the default value set by the [`h2` crate](https://crates.io/crates/h2).
/// As of v0.4.0, it is 20.
///
/// See <https://github.com/hyperium/hyper/issues/2877> for more information.
pub fn max_pending_accept_reset_streams(&mut self, max: impl Into<Option<usize>>) -> &mut Self {
self.h2_builder.max_pending_accept_reset_streams = max.into();
self
}
/// Configures the maximum number of local reset streams allowed before a GOAWAY will be sent.
///
/// If not set, hyper will use a default, currently of 1024.
///
/// If `None` is supplied, hyper will not apply any limit.
/// This is not advised, as it can potentially expose servers to DOS vulnerabilities.
///
/// See <https://rustsec.org/advisories/RUSTSEC-2024-0003.html> for more information.
#[cfg(feature = "http2")]
#[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
pub fn max_local_error_reset_streams(mut self, max: impl Into<Option<usize>>) -> Self {
self.h2_builder.max_local_error_reset_streams = max.into();
self
}
/// Sets the [`SETTINGS_INITIAL_WINDOW_SIZE`][spec] option for HTTP2
/// stream-level flow control.
///
/// Passing `None` will do nothing.
///
/// If not set, hyper will use a default.
///
/// [spec]: https://httpwg.org/specs/rfc9113.html#SETTINGS_INITIAL_WINDOW_SIZE
pub fn initial_stream_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
if let Some(sz) = sz.into() {
self.h2_builder.adaptive_window = false;
self.h2_builder.initial_stream_window_size = sz;
}
self
}
/// Sets the max connection-level flow control for HTTP2.
///
/// Passing `None` will do nothing.
///
/// If not set, hyper will use a default.
pub fn initial_connection_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
if let Some(sz) = sz.into() {
self.h2_builder.adaptive_window = false;
self.h2_builder.initial_conn_window_size = sz;
}
self
}
/// Sets whether to use an adaptive flow control.
///
/// Enabling this will override the limits set in
/// `initial_stream_window_size` and
/// `initial_connection_window_size`.
pub fn adaptive_window(&mut self, enabled: bool) -> &mut Self {
use proto::h2::SPEC_WINDOW_SIZE;
self.h2_builder.adaptive_window = enabled;
if enabled {
self.h2_builder.initial_conn_window_size = SPEC_WINDOW_SIZE;
self.h2_builder.initial_stream_window_size = SPEC_WINDOW_SIZE;
}
self
}
/// Sets the maximum frame size to use for HTTP2.
///
/// Passing `None` will do nothing.
///
/// If not set, hyper will use a default.
pub fn max_frame_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
if let Some(sz) = sz.into() {
self.h2_builder.max_frame_size = sz;
}
self
}
/// Sets the [`SETTINGS_MAX_CONCURRENT_STREAMS`][spec] option for HTTP2
/// connections.
///
/// Default is 200, but not part of the stability of hyper. It could change
/// in a future release. You are encouraged to set your own limit.
///
/// Passing `None` will remove any limit.
///
/// [spec]: https://httpwg.org/specs/rfc9113.html#SETTINGS_MAX_CONCURRENT_STREAMS
pub fn max_concurrent_streams(&mut self, max: impl Into<Option<u32>>) -> &mut Self {
self.h2_builder.max_concurrent_streams = max.into();
self
}
/// Sets an interval for HTTP2 Ping frames should be sent to keep a
/// connection alive.
///
/// Pass `None` to disable HTTP2 keep-alive.
///
/// Default is currently disabled.
pub fn keep_alive_interval(&mut self, interval: impl Into<Option<Duration>>) -> &mut Self {
self.h2_builder.keep_alive_interval = interval.into();
self
}
/// Sets a timeout for receiving an acknowledgement of the keep-alive ping.
///
/// If the ping is not acknowledged within the timeout, the connection will
/// be closed. Does nothing if `keep_alive_interval` is disabled.
///
/// Default is 20 seconds.
pub fn keep_alive_timeout(&mut self, timeout: Duration) -> &mut Self {
self.h2_builder.keep_alive_timeout = timeout;
self
}
/// Set the maximum write buffer size for each HTTP/2 stream.
///
/// Default is currently ~400KB, but may change.
///
/// # Panics
///
/// The value must be no larger than `u32::MAX`.
pub fn max_send_buf_size(&mut self, max: usize) -> &mut Self {
assert!(max <= u32::MAX as usize);
self.h2_builder.max_send_buffer_size = max;
self
}
/// Enables the [extended CONNECT protocol].
///
/// [extended CONNECT protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
pub fn enable_connect_protocol(&mut self) -> &mut Self {
self.h2_builder.enable_connect_protocol = true;
self
}
/// Sets the max size of received header frames.
///
/// Default is currently 16KB, but can change.
pub fn max_header_list_size(&mut self, max: u32) -> &mut Self {
self.h2_builder.max_header_list_size = max;
self
}
/// Set the timer used in background tasks.
pub fn timer<M>(&mut self, timer: M) -> &mut Self
where
M: Timer + Send + Sync + 'static,
{
self.timer = Time::Timer(Arc::new(timer));
self
}
/// Set whether the `date` header should be included in HTTP responses.
///
/// Note that including the `date` header is recommended by RFC 7231.
///
/// Default is true.
pub fn auto_date_header(&mut self, enabled: bool) -> &mut Self {
self.h2_builder.date_header = enabled;
self
}
/// Bind a connection together with a [`Service`](crate::service::Service).
///
/// This returns a Future that must be polled in order for HTTP to be
/// driven on the connection.
pub fn serve_connection<S, I, Bd>(&self, io: I, service: S) -> Connection<I, S, E>
where
S: HttpService<IncomingBody, ResBody = Bd>,
S::Error: Into<Box<dyn StdError + Send + Sync>>,
Bd: Body + 'static,
Bd::Error: Into<Box<dyn StdError + Send + Sync>>,
I: Read + Write + Unpin,
E: Http2ServerConnExec<S::Future, Bd>,
{
let proto = proto::h2::Server::new(
io,
service,
&self.h2_builder,
self.exec.clone(),
self.timer.clone(),
);
Connection { conn: proto }
}
}