use std::fmt;
use std::mem;
use std::sync::Arc;
use bytes::Bytes;
use futures_util::future::{self, Either, FutureExt as _};
use tokio_io::{AsyncRead, AsyncWrite};
use tower_service::Service;
use crate::body::Payload;
use crate::common::{Exec, Future, Pin, Poll, task};
use crate::upgrade::Upgraded;
use crate::proto;
use super::dispatch;
use crate::{Body, Request, Response};
type Http1Dispatcher<T, B, R> = proto::dispatch::Dispatcher<
proto::dispatch::Client<B>,
B,
T,
R,
>;
type ConnEither<T, B> = Either<
Http1Dispatcher<T, B, proto::h1::ClientTransaction>,
proto::h2::ClientTask<B>,
>;
pub async fn handshake<T>(io: T) -> crate::Result<(SendRequest<crate::Body>, Connection<T, crate::Body>)>
where
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
{
Builder::new()
.handshake(io)
.await
}
pub struct SendRequest<B> {
dispatch: dispatch::Sender<Request<B>, Response<Body>>,
}
#[must_use = "futures do nothing unless polled"]
pub struct Connection<T, B>
where
T: AsyncRead + AsyncWrite + Send + 'static,
B: Payload + 'static,
{
inner: Option<ConnEither<T, B>>,
}
#[derive(Clone, Debug)]
pub struct Builder {
pub(super) exec: Exec,
h1_writev: bool,
h1_title_case_headers: bool,
h1_read_buf_exact_size: Option<usize>,
h1_max_buf_size: Option<usize>,
http2: bool,
h2_builder: h2::client::Builder,
}
#[must_use = "futures do nothing unless polled"]
pub struct ResponseFuture {
inner: ResponseFutureState
}
enum ResponseFutureState {
Waiting(dispatch::Promise<Response<Body>>),
Error(Option<crate::Error>),
}
#[derive(Debug)]
pub struct Parts<T> {
pub io: T,
pub read_buf: Bytes,
_inner: (),
}
#[must_use = "futures do nothing unless polled"]
pub(super) struct Http2SendRequest<B> {
dispatch: dispatch::UnboundedSender<Request<B>, Response<Body>>,
}
impl<B> SendRequest<B>
{
pub fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
self.dispatch.poll_ready(cx)
}
pub(super) fn when_ready(self) -> impl Future<Output=crate::Result<Self>> {
let mut me = Some(self);
future::poll_fn(move |cx| {
ready!(me.as_mut().unwrap().poll_ready(cx))?;
Poll::Ready(Ok(me.take().unwrap()))
})
}
pub(super) fn is_ready(&self) -> bool {
self.dispatch.is_ready()
}
pub(super) fn is_closed(&self) -> bool {
self.dispatch.is_closed()
}
pub(super) fn into_http2(self) -> Http2SendRequest<B> {
Http2SendRequest {
dispatch: self.dispatch.unbound(),
}
}
}
impl<B> SendRequest<B>
where
B: Payload + 'static,
{
pub fn send_request(&mut self, req: Request<B>) -> ResponseFuture {
let inner = match self.dispatch.send(req) {
Ok(rx) => {
ResponseFutureState::Waiting(rx)
},
Err(_req) => {
debug!("connection was not ready");
let err = crate::Error::new_canceled().with("connection was not ready");
ResponseFutureState::Error(Some(err))
}
};
ResponseFuture {
inner,
}
}
pub(crate) fn send_request_retryable(&mut self, req: Request<B>) -> impl Future<Output = Result<Response<Body>, (crate::Error, Option<Request<B>>)>> + Unpin
where
B: Send,
{
match self.dispatch.try_send(req) {
Ok(rx) => {
Either::Left(rx.then(move |res| {
match res {
Ok(Ok(res)) => future::ok(res),
Ok(Err(err)) => future::err(err),
Err(_) => panic!("dispatch dropped without returning error"),
}
}))
},
Err(req) => {
debug!("connection was not ready");
let err = crate::Error::new_canceled().with("connection was not ready");
Either::Right(future::err((err, Some(req))))
}
}
}
}
impl<B> Service<Request<B>> for SendRequest<B>
where
B: Payload + 'static, {
type Response = Response<Body>;
type Error = crate::Error;
type Future = ResponseFuture;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
self.poll_ready(cx)
}
fn call(&mut self, req: Request<B>) -> Self::Future {
self.send_request(req)
}
}
impl<B> fmt::Debug for SendRequest<B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("SendRequest")
.finish()
}
}
impl<B> Http2SendRequest<B> {
pub(super) fn is_ready(&self) -> bool {
self.dispatch.is_ready()
}
pub(super) fn is_closed(&self) -> bool {
self.dispatch.is_closed()
}
}
impl<B> Http2SendRequest<B>
where
B: Payload + 'static,
{
pub(super) fn send_request_retryable(&mut self, req: Request<B>) -> impl Future<Output=Result<Response<Body>, (crate::Error, Option<Request<B>>)>>
where
B: Send,
{
match self.dispatch.try_send(req) {
Ok(rx) => {
Either::Left(rx.then(move |res| {
match res {
Ok(Ok(res)) => future::ok(res),
Ok(Err(err)) => future::err(err),
Err(_) => panic!("dispatch dropped without returning error"),
}
}))
},
Err(req) => {
debug!("connection was not ready");
let err = crate::Error::new_canceled().with("connection was not ready");
Either::Right(future::err((err, Some(req))))
}
}
}
}
impl<B> fmt::Debug for Http2SendRequest<B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Http2SendRequest")
.finish()
}
}
impl<B> Clone for Http2SendRequest<B> {
fn clone(&self) -> Self {
Http2SendRequest {
dispatch: self.dispatch.clone(),
}
}
}
impl<T, B> Connection<T, B>
where
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
B: Payload + Unpin + 'static,
B::Data: Unpin,
{
pub fn into_parts(self) -> Parts<T> {
let (io, read_buf, _) = match self.inner.expect("already upgraded") {
Either::Left(h1) => h1.into_inner(),
Either::Right(_h2) => {
panic!("http2 cannot into_inner");
}
};
Parts {
io: io,
read_buf: read_buf,
_inner: (),
}
}
pub fn poll_without_shutdown(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
match self.inner.as_mut().expect("already upgraded") {
&mut Either::Left(ref mut h1) => {
h1.poll_without_shutdown(cx)
},
&mut Either::Right(ref mut h2) => {
Pin::new(h2).poll(cx).map_ok(|_| ())
}
}
}
pub fn without_shutdown(self) -> impl Future<Output=crate::Result<Parts<T>>> {
let mut conn = Some(self);
future::poll_fn(move |cx| -> Poll<crate::Result<Parts<T>>> {
ready!(conn.as_mut().unwrap().poll_without_shutdown(cx))?;
Poll::Ready(Ok(conn.take().unwrap().into_parts()))
})
}
}
impl<T, B> Future for Connection<T, B>
where
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
B: Payload + Unpin + 'static,
B::Data: Unpin,
{
type Output = crate::Result<()>;
fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
match ready!(Pin::new(self.inner.as_mut().unwrap()).poll(cx))? {
proto::Dispatched::Shutdown => {
Poll::Ready(Ok(()))
},
proto::Dispatched::Upgrade(pending) => {
let h1 = match mem::replace(&mut self.inner, None) {
Some(Either::Left(h1)) => h1,
_ => unreachable!("Upgrade expects h1"),
};
let (io, buf, _) = h1.into_inner();
pending.fulfill(Upgraded::new(Box::new(io), buf));
Poll::Ready(Ok(()))
}
}
}
}
impl<T, B> fmt::Debug for Connection<T, B>
where
T: AsyncRead + AsyncWrite + fmt::Debug + Send + 'static,
B: Payload + 'static,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Connection")
.finish()
}
}
impl Builder {
#[inline]
pub fn new() -> Builder {
let mut h2_builder = h2::client::Builder::default();
h2_builder.enable_push(false);
Builder {
exec: Exec::Default,
h1_writev: true,
h1_read_buf_exact_size: None,
h1_title_case_headers: false,
h1_max_buf_size: None,
http2: false,
h2_builder,
}
}
pub fn executor<E>(&mut self, exec: E) -> &mut Builder
where
for<'a> &'a E: tokio_executor::Executor,
E: Send + Sync + 'static,
{
self.exec = Exec::Executor(Arc::new(exec));
self
}
pub(super) fn h1_writev(&mut self, enabled: bool) -> &mut Builder {
self.h1_writev = enabled;
self
}
pub(super) fn h1_title_case_headers(&mut self, enabled: bool) -> &mut Builder {
self.h1_title_case_headers = enabled;
self
}
pub(super) fn h1_read_buf_exact_size(&mut self, sz: Option<usize>) -> &mut Builder {
self.h1_read_buf_exact_size = sz;
self.h1_max_buf_size = None;
self
}
pub(super) fn h1_max_buf_size(&mut self, max: usize) -> &mut Self {
assert!(
max >= proto::h1::MINIMUM_MAX_BUFFER_SIZE,
"the max_buf_size cannot be smaller than the minimum that h1 specifies."
);
self.h1_max_buf_size = Some(max);
self.h1_read_buf_exact_size = None;
self
}
pub fn http2_only(&mut self, enabled: bool) -> &mut Builder {
self.http2 = enabled;
self
}
pub fn http2_initial_stream_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
if let Some(sz) = sz.into() {
self.h2_builder.initial_window_size(sz);
}
self
}
pub fn http2_initial_connection_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
if let Some(sz) = sz.into() {
self.h2_builder.initial_connection_window_size(sz);
}
self
}
pub fn handshake<T, B>(&self, io: T) -> impl Future<Output = crate::Result<(SendRequest<B>, Connection<T, B>)>>
where
T: AsyncRead + AsyncWrite + Unpin + Send + 'static,
B: Payload + 'static,
B::Data: Unpin,
{
let opts = self.clone();
async move {
trace!("client handshake HTTP/{}", if opts.http2 { 2 } else { 1 });
let (tx, rx) = dispatch::channel();
let either = if !opts.http2 {
let mut conn = proto::Conn::new(io);
if !opts.h1_writev {
conn.set_write_strategy_flatten();
}
if opts.h1_title_case_headers {
conn.set_title_case_headers();
}
if let Some(sz) = opts.h1_read_buf_exact_size {
conn.set_read_buf_exact_size(sz);
}
if let Some(max) = opts.h1_max_buf_size {
conn.set_max_buf_size(max);
}
let cd = proto::h1::dispatch::Client::new(rx);
let dispatch = proto::h1::Dispatcher::new(cd, conn);
Either::Left(dispatch)
} else {
let h2 = proto::h2::client::handshake(io, rx, &opts.h2_builder, opts.exec.clone())
.await?;
Either::Right(h2)
};
Ok((
SendRequest {
dispatch: tx,
},
Connection {
inner: Some(either),
},
))
}
}
}
impl Future for ResponseFuture {
type Output = crate::Result<Response<Body>>;
fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
match self.inner {
ResponseFutureState::Waiting(ref mut rx) => {
Pin::new(rx).poll(cx).map(|res| match res {
Ok(Ok(resp)) => Ok(resp),
Ok(Err(err)) => Err(err),
Err(_canceled) => panic!("dispatch dropped without returning error"),
})
},
ResponseFutureState::Error(ref mut err) => {
Poll::Ready(Err(err.take().expect("polled after ready")))
}
}
}
}
impl fmt::Debug for ResponseFuture {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("ResponseFuture")
.finish()
}
}
trait AssertSend: Send {}
trait AssertSendSync: Send + Sync {}
#[doc(hidden)]
impl<B: Send> AssertSendSync for SendRequest<B> {}
#[doc(hidden)]
impl<T: Send, B: Send> AssertSend for Connection<T, B>
where
T: AsyncRead + AsyncWrite + Send + 'static,
B: Payload + 'static,
{}
#[doc(hidden)]
impl<T: Send + Sync, B: Send + Sync> AssertSendSync for Connection<T, B>
where
T: AsyncRead + AsyncWrite + Send + 'static,
B: Payload + 'static,
B::Data: Send + Sync + 'static,
{}
#[doc(hidden)]
impl AssertSendSync for Builder {}
#[doc(hidden)]
impl AssertSend for ResponseFuture {}