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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{
cmp,
error::Error <span class="kw">as </span>StdError,
future::Future,
marker::PhantomData,
net,
pin::{pin, Pin},
rc::Rc,
task::{Context, Poll},
};
<span class="kw">use </span>actix_codec::{AsyncRead, AsyncWrite};
<span class="kw">use </span>actix_rt::time::{sleep, Sleep};
<span class="kw">use </span>actix_service::Service;
<span class="kw">use </span>actix_utils::future::poll_fn;
<span class="kw">use </span>bytes::{Bytes, BytesMut};
<span class="kw">use </span>futures_core::ready;
<span class="kw">use </span>h2::{
server::{Connection, SendResponse},
Ping, PingPong,
};
<span class="kw">use </span>pin_project_lite::pin_project;
<span class="kw">use crate</span>::{
body::{BodySize, BoxBody, MessageBody},
config::ServiceConfig,
header::{
HeaderName, HeaderValue, CONNECTION, CONTENT_LENGTH, DATE, TRANSFER_ENCODING, UPGRADE,
},
service::HttpFlow,
Extensions, Method, OnConnectData, Payload, Request, Response, ResponseHead,
};
<span class="kw">const </span>CHUNK_SIZE: usize = <span class="number">16_384</span>;
<span class="macro">pin_project!</span> {
<span class="doccomment">/// Dispatcher for HTTP/2 protocol.
</span><span class="kw">pub struct </span>Dispatcher<T, S, B, X, U> {
flow: Rc<HttpFlow<S, X, U>>,
connection: Connection<T, Bytes>,
conn_data: <span class="prelude-ty">Option</span><Rc<Extensions>>,
config: ServiceConfig,
peer_addr: <span class="prelude-ty">Option</span><net::SocketAddr>,
ping_pong: <span class="prelude-ty">Option</span><H2PingPong>,
_phantom: PhantomData<B>
}
}
<span class="kw">impl</span><T, S, B, X, U> Dispatcher<T, S, B, X, U>
<span class="kw">where
</span>T: AsyncRead + AsyncWrite + Unpin,
{
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(
<span class="kw-2">mut </span>conn: Connection<T, Bytes>,
flow: Rc<HttpFlow<S, X, U>>,
config: ServiceConfig,
peer_addr: <span class="prelude-ty">Option</span><net::SocketAddr>,
conn_data: OnConnectData,
timer: <span class="prelude-ty">Option</span><Pin<Box<Sleep>>>,
) -> <span class="self">Self </span>{
<span class="kw">let </span>ping_pong = config.keep_alive().duration().map(|dur| H2PingPong {
timer: timer
.map(|<span class="kw-2">mut </span>timer| {
<span class="comment">// reuse timer slot if it was initialized for handshake
</span>timer.as_mut().reset((config.now() + dur).into());
timer
})
.unwrap_or_else(|| Box::pin(sleep(dur))),
in_flight: <span class="bool-val">false</span>,
ping_pong: conn.ping_pong().unwrap(),
});
<span class="self">Self </span>{
flow,
config,
peer_addr,
connection: conn,
conn_data: conn_data.<span class="number">0</span>.map(Rc::new),
ping_pong,
_phantom: PhantomData,
}
}
}
<span class="kw">struct </span>H2PingPong {
<span class="doccomment">/// Handle to send ping frames from the peer.
</span>ping_pong: PingPong,
<span class="doccomment">/// True when a ping has been sent and is waiting for a reply.
</span>in_flight: bool,
<span class="doccomment">/// Timeout for pong response.
</span>timer: Pin<Box<Sleep>>,
}
<span class="kw">impl</span><T, S, B, X, U> Future <span class="kw">for </span>Dispatcher<T, S, B, X, U>
<span class="kw">where
</span>T: AsyncRead + AsyncWrite + Unpin,
S: Service<Request>,
S::Error: Into<Response<BoxBody>>,
S::Future: <span class="lifetime">'static</span>,
S::Response: Into<Response<B>>,
B: MessageBody,
{
<span class="kw">type </span>Output = <span class="prelude-ty">Result</span><(), <span class="kw">crate</span>::error::DispatchError>;
<span class="attr">#[inline]
</span><span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> {
<span class="kw">let </span>this = <span class="self">self</span>.get_mut();
<span class="kw">loop </span>{
<span class="kw">match </span>Pin::new(<span class="kw-2">&mut </span>this.connection).poll_accept(cx)<span class="question-mark">? </span>{
Poll::Ready(<span class="prelude-val">Some</span>((req, tx))) => {
<span class="kw">let </span>(parts, body) = req.into_parts();
<span class="kw">let </span>payload = <span class="kw">crate</span>::h2::Payload::new(body);
<span class="kw">let </span>pl = Payload::H2 { payload };
<span class="kw">let </span><span class="kw-2">mut </span>req = Request::with_payload(pl);
<span class="kw">let </span>head_req = parts.method == Method::HEAD;
<span class="kw">let </span>head = req.head_mut();
head.uri = parts.uri;
head.method = parts.method;
head.version = parts.version;
head.headers = parts.headers.into();
head.peer_addr = this.peer_addr;
req.conn_data.clone_from(<span class="kw-2">&</span>this.conn_data);
<span class="kw">let </span>fut = this.flow.service.call(req);
<span class="kw">let </span>config = this.config.clone();
<span class="comment">// multiplex request handling with spawn task
</span>actix_rt::spawn(<span class="kw">async move </span>{
<span class="comment">// resolve service call and send response.
</span><span class="kw">let </span>res = <span class="kw">match </span>fut.<span class="kw">await </span>{
<span class="prelude-val">Ok</span>(res) => handle_response(res.into(), tx, config, head_req).<span class="kw">await</span>,
<span class="prelude-val">Err</span>(err) => {
<span class="kw">let </span>res: Response<BoxBody> = err.into();
handle_response(res, tx, config, head_req).<span class="kw">await
</span>}
};
<span class="comment">// log error.
</span><span class="kw">if let </span><span class="prelude-val">Err</span>(err) = res {
<span class="kw">match </span>err {
DispatchError::SendResponse(err) => {
<span class="macro">tracing::trace!</span>(<span class="string">"Error sending response: {err:?}"</span>);
}
DispatchError::SendData(err) => {
<span class="macro">tracing::warn!</span>(<span class="string">"Send data error: {err:?}"</span>);
}
DispatchError::ResponseBody(err) => {
<span class="macro">tracing::error!</span>(<span class="string">"Response payload stream error: {err:?}"</span>);
}
}
}
});
}
Poll::Ready(<span class="prelude-val">None</span>) => <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(())),
Poll::Pending => <span class="kw">match </span>this.ping_pong.as_mut() {
<span class="prelude-val">Some</span>(ping_pong) => <span class="kw">loop </span>{
<span class="kw">if </span>ping_pong.in_flight {
<span class="comment">// When there is an in-flight ping-pong, poll pong and and keep-alive
// timer. On successful pong received, update keep-alive timer to
// determine the next timing of ping pong.
</span><span class="kw">match </span>ping_pong.ping_pong.poll_pong(cx)<span class="question-mark">? </span>{
Poll::Ready(<span class="kw">_</span>) => {
ping_pong.in_flight = <span class="bool-val">false</span>;
<span class="kw">let </span>dead_line = this.config.keep_alive_deadline().unwrap();
ping_pong.timer.as_mut().reset(dead_line.into());
}
Poll::Pending => {
<span class="kw">return </span>ping_pong.timer.as_mut().poll(cx).map(|<span class="kw">_</span>| <span class="prelude-val">Ok</span>(()));
}
}
} <span class="kw">else </span>{
<span class="comment">// When there is no in-flight ping-pong, keep-alive timer is used to
// wait for next timing of ping-pong. Therefore, at this point it serves
// as an interval instead.
</span><span class="macro">ready!</span>(ping_pong.timer.as_mut().poll(cx));
ping_pong.ping_pong.send_ping(Ping::opaque())<span class="question-mark">?</span>;
<span class="kw">let </span>dead_line = this.config.keep_alive_deadline().unwrap();
ping_pong.timer.as_mut().reset(dead_line.into());
ping_pong.in_flight = <span class="bool-val">true</span>;
}
},
<span class="prelude-val">None </span>=> <span class="kw">return </span>Poll::Pending,
},
}
}
}
}
<span class="kw">enum </span>DispatchError {
SendResponse(h2::Error),
SendData(h2::Error),
ResponseBody(Box<<span class="kw">dyn </span>StdError>),
}
<span class="kw">async fn </span>handle_response<B>(
res: Response<B>,
<span class="kw-2">mut </span>tx: SendResponse<Bytes>,
config: ServiceConfig,
head_req: bool,
) -> <span class="prelude-ty">Result</span><(), DispatchError>
<span class="kw">where
</span>B: MessageBody,
{
<span class="kw">let </span>(res, body) = res.replace_body(());
<span class="comment">// prepare response.
</span><span class="kw">let </span><span class="kw-2">mut </span>size = body.size();
<span class="kw">let </span>res = prepare_response(config, res.head(), <span class="kw-2">&mut </span>size);
<span class="kw">let </span>eof_or_head = size.is_eof() || head_req;
<span class="comment">// send response head and return on eof.
</span><span class="kw">let </span><span class="kw-2">mut </span>stream = tx
.send_response(res, eof_or_head)
.map_err(DispatchError::SendResponse)<span class="question-mark">?</span>;
<span class="kw">if </span>eof_or_head {
<span class="kw">return </span><span class="prelude-val">Ok</span>(());
}
<span class="kw">let </span><span class="kw-2">mut </span>body = <span class="macro">pin!</span>(body);
<span class="comment">// poll response body and send chunks to client
</span><span class="kw">while let </span><span class="prelude-val">Some</span>(res) = poll_fn(|cx| body.as_mut().poll_next(cx)).<span class="kw">await </span>{
<span class="kw">let </span><span class="kw-2">mut </span>chunk = res.map_err(|err| DispatchError::ResponseBody(err.into()))<span class="question-mark">?</span>;
<span class="lifetime">'send</span>: <span class="kw">loop </span>{
<span class="kw">let </span>chunk_size = cmp::min(chunk.len(), CHUNK_SIZE);
<span class="comment">// reserve enough space and wait for stream ready.
</span>stream.reserve_capacity(chunk_size);
<span class="kw">match </span>poll_fn(|cx| stream.poll_capacity(cx)).<span class="kw">await </span>{
<span class="comment">// No capacity left. drop body and return.
</span><span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(()),
<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(err)) => <span class="kw">return </span><span class="prelude-val">Err</span>(DispatchError::SendData(err)),
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(cap)) => {
<span class="comment">// split chunk to writeable size and send to client
</span><span class="kw">let </span>len = chunk.len();
<span class="kw">let </span>bytes = chunk.split_to(cmp::min(len, cap));
stream
.send_data(bytes, <span class="bool-val">false</span>)
.map_err(DispatchError::SendData)<span class="question-mark">?</span>;
<span class="comment">// Current chuck completely sent. break send loop and poll next one.
</span><span class="kw">if </span>chunk.is_empty() {
<span class="kw">break </span><span class="lifetime">'send</span>;
}
}
}
}
}
<span class="comment">// response body streaming finished. send end of stream and return.
</span>stream
.send_data(Bytes::new(), <span class="bool-val">true</span>)
.map_err(DispatchError::SendData)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(())
}
<span class="kw">fn </span>prepare_response(
config: ServiceConfig,
head: <span class="kw-2">&</span>ResponseHead,
size: <span class="kw-2">&mut </span>BodySize,
) -> http::Response<()> {
<span class="kw">let </span><span class="kw-2">mut </span>has_date = <span class="bool-val">false</span>;
<span class="kw">let </span><span class="kw-2">mut </span>skip_len = size != <span class="kw-2">&</span>BodySize::Stream;
<span class="kw">let </span><span class="kw-2">mut </span>res = http::Response::new(());
<span class="kw-2">*</span>res.status_mut() = head.status;
<span class="kw-2">*</span>res.version_mut() = http::Version::HTTP_2;
<span class="comment">// Content length
</span><span class="kw">match </span>head.status {
http::StatusCode::NO_CONTENT
| http::StatusCode::CONTINUE
| http::StatusCode::PROCESSING => <span class="kw-2">*</span>size = BodySize::None,
http::StatusCode::SWITCHING_PROTOCOLS => {
skip_len = <span class="bool-val">true</span>;
<span class="kw-2">*</span>size = BodySize::Stream;
}
<span class="kw">_ </span>=> {}
}
<span class="kw">match </span>size {
BodySize::None | BodySize::Stream => {}
BodySize::Sized(<span class="number">0</span>) => {
<span class="attr">#[allow(clippy::declare_interior_mutable_const)]
</span><span class="kw">const </span>HV_ZERO: HeaderValue = HeaderValue::from_static(<span class="string">"0"</span>);
res.headers_mut().insert(CONTENT_LENGTH, HV_ZERO);
}
BodySize::Sized(len) => {
<span class="kw">let </span><span class="kw-2">mut </span>buf = itoa::Buffer::new();
res.headers_mut().insert(
CONTENT_LENGTH,
HeaderValue::from_str(buf.format(<span class="kw-2">*</span>len)).unwrap(),
);
}
};
<span class="comment">// copy headers
</span><span class="kw">for </span>(key, value) <span class="kw">in </span>head.headers.iter() {
<span class="kw">match </span>key {
<span class="comment">// omit HTTP/1.x only headers according to:
// https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.2
</span><span class="kw-2">&</span>CONNECTION | <span class="kw-2">&</span>TRANSFER_ENCODING | <span class="kw-2">&</span>UPGRADE => <span class="kw">continue</span>,
<span class="kw-2">&</span>CONTENT_LENGTH <span class="kw">if </span>skip_len => <span class="kw">continue</span>,
<span class="kw-2">&</span>DATE => has_date = <span class="bool-val">true</span>,
<span class="comment">// omit HTTP/1.x only headers according to:
// https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2.2
</span>hdr <span class="kw">if </span>hdr == HeaderName::from_static(<span class="string">"keep-alive"</span>)
|| hdr == HeaderName::from_static(<span class="string">"proxy-connection"</span>) =>
{
<span class="kw">continue
</span>}
<span class="kw">_ </span>=> {}
}
res.headers_mut().append(key, value.clone());
}
<span class="comment">// set date header
</span><span class="kw">if </span>!has_date {
<span class="kw">let </span><span class="kw-2">mut </span>bytes = BytesMut::with_capacity(<span class="number">29</span>);
config.write_date_header_value(<span class="kw-2">&mut </span>bytes);
res.headers_mut().insert(
DATE,
<span class="comment">// SAFETY: serialized date-times are known ASCII strings
</span><span class="kw">unsafe </span>{ HeaderValue::from_maybe_shared_unchecked(bytes.freeze()) },
);
}
res
}
</code></pre></div></section></main></body></html>