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feat(client): add ALPN h2 support for client connectors

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- Adds `Connected::negotiated_h2()` method to signal the connection must
  use HTTP2. `Connect` implementations should set this if using ALPN.

If a connection to a host is detected to have been upgraded via ALPN,
any other oustanding connect futures will be canceled, and the waiting
requests will make use of the single HTTP2 connection.

The `http2_only` builder configuration still works the same, not
requiring ALPN at all, and always using only a single connection.
This commit is contained in:
Sean McArthur
2018-10-26 18:55:03 -07:00
parent bf188b28fe
commit 976a77a673
7 changed files with 200 additions and 95 deletions
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1
src/client/conn.rs
View File

@@ -466,6 +466,7 @@ impl Builder {
T: AsyncRead + AsyncWrite + Send + 'static,
B: Payload + 'static,
{
trace!("client handshake HTTP/{}", if self.http2 { 2 } else { 1 });
Handshake {
builder: self.clone(),
io: Some(io),

19
src/client/connect/mod.rs
View File

@@ -36,7 +36,6 @@ pub trait Connect: Send + Sync {
/// A set of properties to describe where and how to try to connect.
#[derive(Clone, Debug)]
pub struct Destination {
//pub(super) alpn: Alpn,
pub(super) uri: Uri,
}
@@ -46,21 +45,18 @@ pub struct Destination {
/// was used, or if connected to an HTTP proxy.
#[derive(Debug)]
pub struct Connected {
//alpn: Alpn,
pub(super) alpn: Alpn,
pub(super) is_proxied: bool,
pub(super) extra: Option<Extra>,
}
pub(super) struct Extra(Box<ExtraInner>);
/*TODO: when HTTP1 Upgrades to H2 are added, this will be needed
#[derive(Debug)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub(super) enum Alpn {
Http1,
//H2,
//Http1OrH2
H2,
None,
}
*/
impl Destination {
/// Get the protocol scheme.
@@ -246,7 +242,7 @@ impl Connected {
/// Create new `Connected` type with empty metadata.
pub fn new() -> Connected {
Connected {
//alpn: Alpn::Http1,
alpn: Alpn::None,
is_proxied: false,
extra: None,
}
@@ -274,19 +270,18 @@ impl Connected {
self
}
/*
/// Set that the connected transport negotiated HTTP/2 as it's
/// next protocol.
pub fn h2(mut self) -> Connected {
pub fn negotiated_h2(mut self) -> Connected {
self.alpn = Alpn::H2;
self
}
*/
// Don't public expose that `Connected` is `Clone`, unsure if we want to
// keep that contract...
pub(super) fn clone(&self) -> Connected {
Connected {
alpn: self.alpn.clone(),
is_proxied: self.is_proxied,
extra: self.extra.clone(),
}

132
src/client/mod.rs
View File

@@ -86,12 +86,12 @@ use futures::{Async, Future, Poll};
use futures::future::{self, Either, Executor};
use futures::sync::oneshot;
use http::{Method, Request, Response, Uri, Version};
use http::header::{Entry, HeaderValue, HOST};
use http::header::{HeaderValue, HOST};
use http::uri::Scheme;
use body::{Body, Payload};
use common::{Exec, lazy as hyper_lazy, Lazy};
use self::connect::{Connect, Connected, Destination};
use self::connect::{Alpn, Connect, Connected, Destination};
use self::pool::{Key as PoolKey, Pool, Poolable, Pooled, Reservation};
#[cfg(feature = "runtime")] pub use self::connect::HttpConnector;
@@ -192,23 +192,19 @@ where C: Connect + Sync + 'static,
/// Send a constructed Request using this Client.
pub fn request(&self, mut req: Request<B>) -> ResponseFuture {
let is_http_11 = self.ver == Ver::Http1 && match req.version() {
Version::HTTP_11 => true,
Version::HTTP_10 => false,
other => {
let is_http_connect = req.method() == &Method::CONNECT;
match req.version() {
Version::HTTP_11 => (),
Version::HTTP_10 => if is_http_connect {
debug!("CONNECT is not allowed for HTTP/1.0");
return ResponseFuture::new(Box::new(future::err(::Error::new_user_unsupported_request_method())));
},
other => if self.ver != Ver::Http2 {
error!("Request has unsupported version \"{:?}\"", other);
return ResponseFuture::new(Box::new(future::err(::Error::new_user_unsupported_version())));
}
};
let is_http_connect = req.method() == &Method::CONNECT;
if !is_http_11 && is_http_connect {
debug!("client does not support CONNECT requests for {:?}", req.version());
return ResponseFuture::new(Box::new(future::err(::Error::new_user_unsupported_request_method())));
}
let uri = req.uri().clone();
let domain = match (uri.scheme_part(), uri.authority_part()) {
(Some(scheme), Some(auth)) => {
@@ -233,21 +229,7 @@ where C: Connect + Sync + 'static,
}
};
if self.set_host && self.ver == Ver::Http1 {
if let Entry::Vacant(entry) = req.headers_mut().entry(HOST).expect("HOST is always valid header name") {
let hostname = uri.host().expect("authority implies host");
let host = if let Some(port) = uri.port() {
let s = format!("{}:{}", hostname, port);
HeaderValue::from_str(&s)
} else {
HeaderValue::from_str(hostname)
}.expect("uri host is valid header value");
entry.insert(host);
}
}
let pool_key = (Arc::new(domain.to_string()), self.ver);
let pool_key = Arc::new(domain.to_string());
ResponseFuture::new(Box::new(self.retryably_send_request(req, pool_key)))
}
@@ -283,11 +265,28 @@ where C: Connect + Sync + 'static,
fn send_request(&self, mut req: Request<B>, pool_key: PoolKey) -> impl Future<Item=Response<Body>, Error=ClientError<B>> {
let conn = self.connection_for(req.uri().clone(), pool_key);
let ver = self.ver;
let set_host = self.set_host;
let executor = self.executor.clone();
conn.and_then(move |mut pooled| {
if ver == Ver::Http1 {
// CONNECT always sends origin-form, so check it first...
if pooled.is_http1() {
if set_host {
let uri = req.uri().clone();
req
.headers_mut()
.entry(HOST)
.expect("HOST is always valid header name")
.or_insert_with(|| {
let hostname = uri.host().expect("authority implies host");
if let Some(port) = uri.port() {
let s = format!("{}:{}", hostname, port);
HeaderValue::from_str(&s)
} else {
HeaderValue::from_str(hostname)
}.expect("uri host is valid header value")
});
}
// CONNECT always sends authority-form, so check it first...
if req.method() == &Method::CONNECT {
authority_form(req.uri_mut());
} else if pooled.conn_info.is_proxied {
@@ -295,11 +294,9 @@ where C: Connect + Sync + 'static,
} else {
origin_form(req.uri_mut());
};
} else {
debug_assert!(
req.method() != &Method::CONNECT,
"Client should have returned Error for HTTP2 CONNECT"
);
} else if req.method() == &Method::CONNECT {
debug!("client does not support CONNECT requests over HTTP2");
return Either::A(future::err(ClientError::Normal(::Error::new_user_unsupported_request_method())));
}
let fut = pooled.send_request_retryable(req)
@@ -322,10 +319,10 @@ where C: Connect + Sync + 'static,
// To counteract this, we must check if our senders 'want' channel
// has been closed after having tried to send. If so, error out...
if pooled.is_closed() {
return Either::A(fut);
return Either::B(Either::A(fut));
}
Either::B(fut
Either::B(Either::B(fut
.and_then(move |mut res| {
// If pooled is HTTP/2, we can toss this reference immediately.
//
@@ -337,7 +334,7 @@ where C: Connect + Sync + 'static,
// for a new request to start.
//
// It won't be ready if there is a body to stream.
if ver == Ver::Http2 || !pooled.is_pool_enabled() || pooled.is_ready() {
if pooled.is_http2() || !pooled.is_pool_enabled() || pooled.is_ready() {
drop(pooled);
} else if !res.body().is_end_stream() {
let (delayed_tx, delayed_rx) = oneshot::channel();
@@ -370,7 +367,7 @@ where C: Connect + Sync + 'static,
}
}
Ok(res)
}))
})))
})
}
@@ -463,8 +460,9 @@ where C: Connect + Sync + 'static,
let pool = self.pool.clone();
let h1_writev = self.h1_writev;
let h1_title_case_headers = self.h1_title_case_headers;
let ver = self.ver;
let is_ver_h2 = self.ver == Ver::Http2;
let connector = self.connector.clone();
let ver = pool_key.1;
let dst = Destination {
uri,
};
@@ -474,7 +472,7 @@ where C: Connect + Sync + 'static,
// If the pool_key is for HTTP/2, and there is already a
// connection being estabalished, then this can't take a
// second lock. The "connect_to" future is Canceled.
let connecting = match pool.connecting(&pool_key) {
let connecting = match pool.connecting(&pool_key, ver) {
Some(lock) => lock,
None => {
let canceled = ::Error::new_canceled(Some("HTTP/2 connection in progress"));
@@ -484,11 +482,31 @@ where C: Connect + Sync + 'static,
Either::A(connector.connect(dst)
.map_err(::Error::new_connect)
.and_then(move |(io, connected)| {
conn::Builder::new()
// If ALPN is h2 and we aren't http2_only already,
// then we need to convert our pool checkout into
// a single HTTP2 one.
let connecting = if connected.alpn == Alpn::H2 && !is_ver_h2 {
match connecting.alpn_h2(&pool) {
Some(lock) => {
trace!("ALPN negotiated h2, updating pool");
lock
},
None => {
// Another connection has already upgraded,
// the pool checkout should finish up for us.
let canceled = ::Error::new_canceled(Some("ALPN upgraded to HTTP/2"));
return Either::B(future::err(canceled));
}
}
} else {
connecting
};
let is_h2 = is_ver_h2 || connected.alpn == Alpn::H2;
Either::A(conn::Builder::new()
.exec(executor.clone())
.h1_writev(h1_writev)
.h1_title_case_headers(h1_title_case_headers)
.http2_only(pool_key.1 == Ver::Http2)
.http2_only(is_h2)
.handshake(io)
.and_then(move |(tx, conn)| {
let bg = executor.execute(conn.map_err(|e| {
@@ -509,12 +527,13 @@ where C: Connect + Sync + 'static,
.map(move |tx| {
pool.pooled(connecting, PoolClient {
conn_info: connected,
tx: match ver {
Ver::Http1 => PoolTx::Http1(tx),
Ver::Http2 => PoolTx::Http2(tx.into_http2()),
tx: if is_h2 {
PoolTx::Http2(tx.into_http2())
} else {
PoolTx::Http1(tx)
},
})
})
}))
}))
})
}
@@ -591,6 +610,17 @@ impl<B> PoolClient<B> {
}
}
fn is_http1(&self) -> bool {
!self.is_http2()
}
fn is_http2(&self) -> bool {
match self.tx {
PoolTx::Http1(_) => false,
PoolTx::Http2(_) => true,
}
}
fn is_ready(&self) -> bool {
match self.tx {
PoolTx::Http1(ref tx) => tx.is_ready(),
@@ -650,6 +680,10 @@ where
}
}
}
fn can_share(&self) -> bool {
self.is_http2()
}
}
// FIXME: allow() required due to `impl Trait` leaking types to this lint

64
src/client/pool.rs
View File

@@ -30,6 +30,7 @@ pub(super) trait Poolable: Send + Sized + 'static {
///
/// Allows for HTTP/2 to return a shared reservation.
fn reserve(self) -> Reservation<Self>;
fn can_share(&self) -> bool;
}
/// When checking out a pooled connection, it might be that the connection
@@ -50,7 +51,7 @@ pub(super) enum Reservation<T> {
}
/// Simple type alias in case the key type needs to be adjusted.
pub(super) type Key = (Arc<String>, Ver);
pub(super) type Key = Arc<String>;
struct PoolInner<T> {
// A flag that a connection is being estabilished, and the connection
@@ -151,8 +152,8 @@ impl<T: Poolable> Pool<T> {
/// Ensure that there is only ever 1 connecting task for HTTP/2
/// connections. This does nothing for HTTP/1.
pub(super) fn connecting(&self, key: &Key) -> Option<Connecting<T>> {
if key.1 == Ver::Http2 {
pub(super) fn connecting(&self, key: &Key, ver: Ver) -> Option<Connecting<T>> {
if ver == Ver::Http2 {
if let Some(ref enabled) = self.inner {
let mut inner = enabled.lock().unwrap();
return if inner.connecting.insert(key.clone()) {
@@ -162,7 +163,7 @@ impl<T: Poolable> Pool<T> {
};
Some(connecting)
} else {
trace!("HTTP/2 connecting already in progress for {:?}", key.0);
trace!("HTTP/2 connecting already in progress for {:?}", key);
None
};
}
@@ -190,7 +191,7 @@ impl<T: Poolable> Pool<T> {
#[cfg(feature = "runtime")]
#[cfg(test)]
pub(super) fn h1_key(&self, s: &str) -> Key {
(Arc::new(s.to_string()), Ver::Http1)
Arc::new(s.to_string())
}
#[cfg(feature = "runtime")]
@@ -243,11 +244,6 @@ impl<T: Poolable> Pool<T> {
let (value, pool_ref) = if let Some(ref enabled) = self.inner {
match value.reserve() {
Reservation::Shared(to_insert, to_return) => {
debug_assert_eq!(
connecting.key.1,
Ver::Http2,
"shared reservation without Http2"
);
let mut inner = enabled.lock().unwrap();
inner.put(connecting.key.clone(), to_insert, enabled);
// Do this here instead of Drop for Connecting because we
@@ -294,7 +290,7 @@ impl<T: Poolable> Pool<T> {
// unique or shared. So, the hack is to just assume Ver::Http2 means
// shared... :(
let mut pool_ref = WeakOpt::none();
if key.1 == Ver::Http1 {
if !value.can_share() {
if let Some(ref enabled) = self.inner {
pool_ref = WeakOpt::downgrade(enabled);
}
@@ -377,7 +373,7 @@ impl<'a, T: Poolable + 'a> IdlePopper<'a, T> {
impl<T: Poolable> PoolInner<T> {
fn put(&mut self, key: Key, value: T, __pool_ref: &Arc<Mutex<PoolInner<T>>>) {
if key.1 == Ver::Http2 && self.idle.contains_key(&key) {
if value.can_share() && self.idle.contains_key(&key) {
trace!("put; existing idle HTTP/2 connection for {:?}", key);
return;
}
@@ -601,7 +597,7 @@ impl<T: Poolable> Drop for Pooled<T> {
if let Ok(mut inner) = pool.lock() {
inner.put(self.key.clone(), value, &pool);
}
} else if self.key.1 == Ver::Http1 {
} else if !value.can_share() {
trace!("pool dropped, dropping pooled ({:?})", self.key);
}
// Ver::Http2 is already in the Pool (or dead), so we wouldn't
@@ -705,16 +701,22 @@ pub(super) struct Connecting<T: Poolable> {
pool: WeakOpt<Mutex<PoolInner<T>>>,
}
impl<T: Poolable> Connecting<T> {
pub(super) fn alpn_h2(self, pool: &Pool<T>) -> Option<Self> {
debug_assert!(
self.pool.0.is_none(),
"Connecting::alpn_h2 but already Http2"
);
pool.connecting(&self.key, Ver::Http2)
}
}
impl<T: Poolable> Drop for Connecting<T> {
fn drop(&mut self) {
if let Some(pool) = self.pool.upgrade() {
// No need to panic on drop, that could abort!
if let Ok(mut inner) = pool.lock() {
debug_assert_eq!(
self.key.1,
Ver::Http2,
"Connecting constructed without Http2"
);
inner.connected(&self.key);
}
}
@@ -804,7 +806,7 @@ mod tests {
use futures::{Async, Future};
use futures::future;
use common::Exec;
use super::{Connecting, Key, Poolable, Pool, Reservation, Ver, WeakOpt};
use super::{Connecting, Key, Poolable, Pool, Reservation, WeakOpt};
/// Test unique reservations.
#[derive(Debug, PartialEq, Eq)]
@@ -818,6 +820,10 @@ mod tests {
fn reserve(self) -> Reservation<Self> {
Reservation::Unique(self)
}
fn can_share(&self) -> bool {
false
}
}
fn c<T: Poolable>(key: Key) -> Connecting<T> {
@@ -845,7 +851,7 @@ mod tests {
#[test]
fn test_pool_checkout_smoke() {
let pool = pool_no_timer();
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
let pooled = pool.pooled(c(key.clone()), Uniq(41));
drop(pooled);
@@ -860,7 +866,7 @@ mod tests {
fn test_pool_checkout_returns_none_if_expired() {
future::lazy(|| {
let pool = pool_no_timer();
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
let pooled = pool.pooled(c(key.clone()), Uniq(41));
drop(pooled);
::std::thread::sleep(pool.locked().timeout.unwrap());
@@ -873,7 +879,7 @@ mod tests {
fn test_pool_checkout_removes_expired() {
future::lazy(|| {
let pool = pool_no_timer();
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
pool.pooled(c(key.clone()), Uniq(41));
pool.pooled(c(key.clone()), Uniq(5));
@@ -894,7 +900,7 @@ mod tests {
fn test_pool_max_idle_per_host() {
future::lazy(|| {
let pool = pool_max_idle_no_timer(2);
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
pool.pooled(c(key.clone()), Uniq(41));
pool.pooled(c(key.clone()), Uniq(5));
@@ -920,7 +926,7 @@ mod tests {
&Exec::Default,
);
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
// Since pool.pooled() will be calling spawn on drop, need to be sure
// those drops are called while `rt` is the current executor. To do so,
@@ -945,7 +951,7 @@ mod tests {
#[test]
fn test_pool_checkout_task_unparked() {
let pool = pool_no_timer();
let key = (Arc::new("foo".to_string()), Ver::Http1);
let key = Arc::new("foo".to_string());
let pooled = pool.pooled(c(key.clone()), Uniq(41));
let checkout = pool.checkout(key).join(future::lazy(move || {
@@ -964,7 +970,7 @@ mod tests {
fn test_pool_checkout_drop_cleans_up_waiters() {
future::lazy(|| {
let pool = pool_no_timer::<Uniq<i32>>();
let key = (Arc::new("localhost:12345".to_string()), Ver::Http1);
let key = Arc::new("localhost:12345".to_string());
let mut checkout1 = pool.checkout(key.clone());
let mut checkout2 = pool.checkout(key.clone());
@@ -1000,12 +1006,16 @@ mod tests {
fn reserve(self) -> Reservation<Self> {
Reservation::Unique(self)
}
fn can_share(&self) -> bool {
false
}
}
#[test]
fn pooled_drop_if_closed_doesnt_reinsert() {
let pool = pool_no_timer();
let key = (Arc::new("localhost:12345".to_string()), Ver::Http1);
let key = Arc::new("localhost:12345".to_string());
pool.pooled(c(key.clone()), CanClose {
val: 57,
closed: true,

1
src/client/tests.rs
View File

@@ -207,4 +207,3 @@ fn checkout_win_allows_connect_future_to_be_pooled() {
}
}

15
src/mock.rs
View File

@@ -358,11 +358,12 @@ impl Read for Duplex {
impl Write for Duplex {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let mut inner = self.inner.lock().unwrap();
let ret = inner.write.write(buf);
if let Some(task) = inner.handle_read_task.take() {
trace!("waking DuplexHandle read");
task.notify();
}
inner.write.write(buf)
ret
}
fn flush(&mut self) -> io::Result<()> {
@@ -404,8 +405,7 @@ impl DuplexHandle {
inner.handle_read_task = Some(task::current());
return Ok(Async::NotReady);
}
inner.write.inner.vec.truncate(0);
Ok(Async::Ready(inner.write.inner.len()))
inner.write.read(buf).map(Async::Ready)
}
pub fn write(&self, bytes: &[u8]) -> Poll<usize, io::Error> {
@@ -456,6 +456,13 @@ impl MockConnector {
}
pub fn mock_fut<F>(&mut self, key: &str, fut: F) -> DuplexHandle
where
F: Future + Send + 'static,
{
self.mock_opts(key, Connected::new(), fut)
}
pub fn mock_opts<F>(&mut self, key: &str, connected: Connected, fut: F) -> DuplexHandle
where
F: Future + Send + 'static,
{
@@ -465,7 +472,7 @@ impl MockConnector {
let fut = Box::new(fut.then(move |_| {
trace!("MockConnector mocked fut ready");
Ok((duplex, Connected::new()))
Ok((duplex, connected))
}));
self.mocks.lock().unwrap().entry(key)
.or_insert(Vec::new())