RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.

zeroidc/vendor/hyper/src/client/connect/dns.rs

@@ -0,0 +1,425 @@
+//! DNS Resolution used by the `HttpConnector`.
+//!
+//! This module contains:
+//!
+//! - A [`GaiResolver`](GaiResolver) that is the default resolver for the
+//!   `HttpConnector`.
+//! - The `Name` type used as an argument to custom resolvers.
+//!
+//! # Resolvers are `Service`s
+//!
+//! A resolver is just a
+//! `Service<Name, Response = impl Iterator<Item = SocketAddr>>`.
+//!
+//! A simple resolver that ignores the name and always returns a specific
+//! address:
+//!
+//! ```rust,ignore
+//! use std::{convert::Infallible, iter, net::SocketAddr};
+//!
+//! let resolver = tower::service_fn(|_name| async {
+//!     Ok::<_, Infallible>(iter::once(SocketAddr::from(([127, 0, 0, 1], 8080))))
+//! });
+//! ```
+use std::error::Error;
+use std::future::Future;
+use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs};
+use std::pin::Pin;
+use std::str::FromStr;
+use std::task::{self, Poll};
+use std::{fmt, io, vec};
+
+use tokio::task::JoinHandle;
+use tower_service::Service;
+use tracing::debug;
+
+pub(super) use self::sealed::Resolve;
+
+/// A domain name to resolve into IP addresses.
+#[derive(Clone, Hash, Eq, PartialEq)]
+pub struct Name {
+    host: Box<str>,
+}
+
+/// A resolver using blocking `getaddrinfo` calls in a threadpool.
+#[derive(Clone)]
+pub struct GaiResolver {
+    _priv: (),
+}
+
+/// An iterator of IP addresses returned from `getaddrinfo`.
+pub struct GaiAddrs {
+    inner: SocketAddrs,
+}
+
+/// A future to resolve a name returned by `GaiResolver`.
+pub struct GaiFuture {
+    inner: JoinHandle<Result<SocketAddrs, io::Error>>,
+}
+
+impl Name {
+    pub(super) fn new(host: Box<str>) -> Name {
+        Name { host }
+    }
+
+    /// View the hostname as a string slice.
+    pub fn as_str(&self) -> &str {
+        &self.host
+    }
+}
+
+impl fmt::Debug for Name {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.host, f)
+    }
+}
+
+impl fmt::Display for Name {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&self.host, f)
+    }
+}
+
+impl FromStr for Name {
+    type Err = InvalidNameError;
+
+    fn from_str(host: &str) -> Result<Self, Self::Err> {
+        // Possibly add validation later
+        Ok(Name::new(host.into()))
+    }
+}
+
+/// Error indicating a given string was not a valid domain name.
+#[derive(Debug)]
+pub struct InvalidNameError(());
+
+impl fmt::Display for InvalidNameError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("Not a valid domain name")
+    }
+}
+
+impl Error for InvalidNameError {}
+
+impl GaiResolver {
+    /// Construct a new `GaiResolver`.
+    pub fn new() -> Self {
+        GaiResolver { _priv: () }
+    }
+}
+
+impl Service<Name> for GaiResolver {
+    type Response = GaiAddrs;
+    type Error = io::Error;
+    type Future = GaiFuture;
+
+    fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> Poll<Result<(), io::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, name: Name) -> Self::Future {
+        let blocking = tokio::task::spawn_blocking(move || {
+            debug!("resolving host={:?}", name.host);
+            (&*name.host, 0)
+                .to_socket_addrs()
+                .map(|i| SocketAddrs { iter: i })
+        });
+
+        GaiFuture { inner: blocking }
+    }
+}
+
+impl fmt::Debug for GaiResolver {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.pad("GaiResolver")
+    }
+}
+
+impl Future for GaiFuture {
+    type Output = Result<GaiAddrs, io::Error>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
+        Pin::new(&mut self.inner).poll(cx).map(|res| match res {
+            Ok(Ok(addrs)) => Ok(GaiAddrs { inner: addrs }),
+            Ok(Err(err)) => Err(err),
+            Err(join_err) => {
+                if join_err.is_cancelled() {
+                    Err(io::Error::new(io::ErrorKind::Interrupted, join_err))
+                } else {
+                    panic!("gai background task failed: {:?}", join_err)
+                }
+            }
+        })
+    }
+}
+
+impl fmt::Debug for GaiFuture {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.pad("GaiFuture")
+    }
+}
+
+impl Drop for GaiFuture {
+    fn drop(&mut self) {
+        self.inner.abort();
+    }
+}
+
+impl Iterator for GaiAddrs {
+    type Item = SocketAddr;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
+    }
+}
+
+impl fmt::Debug for GaiAddrs {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.pad("GaiAddrs")
+    }
+}
+
+pub(super) struct SocketAddrs {
+    iter: vec::IntoIter<SocketAddr>,
+}
+
+impl SocketAddrs {
+    pub(super) fn new(addrs: Vec<SocketAddr>) -> Self {
+        SocketAddrs {
+            iter: addrs.into_iter(),
+        }
+    }
+
+    pub(super) fn try_parse(host: &str, port: u16) -> Option<SocketAddrs> {
+        if let Ok(addr) = host.parse::<Ipv4Addr>() {
+            let addr = SocketAddrV4::new(addr, port);
+            return Some(SocketAddrs {
+                iter: vec![SocketAddr::V4(addr)].into_iter(),
+            });
+        }
+        if let Ok(addr) = host.parse::<Ipv6Addr>() {
+            let addr = SocketAddrV6::new(addr, port, 0, 0);
+            return Some(SocketAddrs {
+                iter: vec![SocketAddr::V6(addr)].into_iter(),
+            });
+        }
+        None
+    }
+
+    #[inline]
+    fn filter(self, predicate: impl FnMut(&SocketAddr) -> bool) -> SocketAddrs {
+        SocketAddrs::new(self.iter.filter(predicate).collect())
+    }
+
+    pub(super) fn split_by_preference(
+        self,
+        local_addr_ipv4: Option<Ipv4Addr>,
+        local_addr_ipv6: Option<Ipv6Addr>,
+    ) -> (SocketAddrs, SocketAddrs) {
+        match (local_addr_ipv4, local_addr_ipv6) {
+            (Some(_), None) => (self.filter(SocketAddr::is_ipv4), SocketAddrs::new(vec![])),
+            (None, Some(_)) => (self.filter(SocketAddr::is_ipv6), SocketAddrs::new(vec![])),
+            _ => {
+                let preferring_v6 = self
+                    .iter
+                    .as_slice()
+                    .first()
+                    .map(SocketAddr::is_ipv6)
+                    .unwrap_or(false);
+
+                let (preferred, fallback) = self
+                    .iter
+                    .partition::<Vec<_>, _>(|addr| addr.is_ipv6() == preferring_v6);
+
+                (SocketAddrs::new(preferred), SocketAddrs::new(fallback))
+            }
+        }
+    }
+
+    pub(super) fn is_empty(&self) -> bool {
+        self.iter.as_slice().is_empty()
+    }
+
+    pub(super) fn len(&self) -> usize {
+        self.iter.as_slice().len()
+    }
+}
+
+impl Iterator for SocketAddrs {
+    type Item = SocketAddr;
+    #[inline]
+    fn next(&mut self) -> Option<SocketAddr> {
+        self.iter.next()
+    }
+}
+
+/*
+/// A resolver using `getaddrinfo` calls via the `tokio_executor::threadpool::blocking` API.
+///
+/// Unlike the `GaiResolver` this will not spawn dedicated threads, but only works when running on the
+/// multi-threaded Tokio runtime.
+#[cfg(feature = "runtime")]
+#[derive(Clone, Debug)]
+pub struct TokioThreadpoolGaiResolver(());
+
+/// The future returned by `TokioThreadpoolGaiResolver`.
+#[cfg(feature = "runtime")]
+#[derive(Debug)]
+pub struct TokioThreadpoolGaiFuture {
+    name: Name,
+}
+
+#[cfg(feature = "runtime")]
+impl TokioThreadpoolGaiResolver {
+    /// Creates a new DNS resolver that will use tokio threadpool's blocking
+    /// feature.
+    ///
+    /// **Requires** its futures to be run on the threadpool runtime.
+    pub fn new() -> Self {
+        TokioThreadpoolGaiResolver(())
+    }
+}
+
+#[cfg(feature = "runtime")]
+impl Service<Name> for TokioThreadpoolGaiResolver {
+    type Response = GaiAddrs;
+    type Error = io::Error;
+    type Future = TokioThreadpoolGaiFuture;
+
+    fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> Poll<Result<(), io::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn call(&mut self, name: Name) -> Self::Future {
+        TokioThreadpoolGaiFuture { name }
+    }
+}
+
+#[cfg(feature = "runtime")]
+impl Future for TokioThreadpoolGaiFuture {
+    type Output = Result<GaiAddrs, io::Error>;
+
+    fn poll(self: Pin<&mut Self>, _cx: &mut task::Context<'_>) -> Poll<Self::Output> {
+        match ready!(tokio_executor::threadpool::blocking(|| (
+            self.name.as_str(),
+            0
+        )
+            .to_socket_addrs()))
+        {
+            Ok(Ok(iter)) => Poll::Ready(Ok(GaiAddrs {
+                inner: IpAddrs { iter },
+            })),
+            Ok(Err(e)) => Poll::Ready(Err(e)),
+            // a BlockingError, meaning not on a tokio_executor::threadpool :(
+            Err(e) => Poll::Ready(Err(io::Error::new(io::ErrorKind::Other, e))),
+        }
+    }
+}
+*/
+
+mod sealed {
+    use super::{SocketAddr, Name};
+    use crate::common::{task, Future, Poll};
+    use tower_service::Service;
+
+    // "Trait alias" for `Service<Name, Response = Addrs>`
+    pub trait Resolve {
+        type Addrs: Iterator<Item = SocketAddr>;
+        type Error: Into<Box<dyn std::error::Error + Send + Sync>>;
+        type Future: Future<Output = Result<Self::Addrs, Self::Error>>;
+
+        fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>>;
+        fn resolve(&mut self, name: Name) -> Self::Future;
+    }
+
+    impl<S> Resolve for S
+    where
+        S: Service<Name>,
+        S::Response: Iterator<Item = SocketAddr>,
+        S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+    {
+        type Addrs = S::Response;
+        type Error = S::Error;
+        type Future = S::Future;
+
+        fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
+            Service::poll_ready(self, cx)
+        }
+
+        fn resolve(&mut self, name: Name) -> Self::Future {
+            Service::call(self, name)
+        }
+    }
+}
+
+pub(super) async fn resolve<R>(resolver: &mut R, name: Name) -> Result<R::Addrs, R::Error>
+where
+    R: Resolve,
+{
+    futures_util::future::poll_fn(|cx| resolver.poll_ready(cx)).await?;
+    resolver.resolve(name).await
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::net::{Ipv4Addr, Ipv6Addr};
+
+    #[test]
+    fn test_ip_addrs_split_by_preference() {
+        let ip_v4 = Ipv4Addr::new(127, 0, 0, 1);
+        let ip_v6 = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+        let v4_addr = (ip_v4, 80).into();
+        let v6_addr = (ip_v6, 80).into();
+
+        let (mut preferred, mut fallback) = SocketAddrs {
+            iter: vec![v4_addr, v6_addr].into_iter(),
+        }
+        .split_by_preference(None, None);
+        assert!(preferred.next().unwrap().is_ipv4());
+        assert!(fallback.next().unwrap().is_ipv6());
+
+        let (mut preferred, mut fallback) = SocketAddrs {
+            iter: vec![v6_addr, v4_addr].into_iter(),
+        }
+        .split_by_preference(None, None);
+        assert!(preferred.next().unwrap().is_ipv6());
+        assert!(fallback.next().unwrap().is_ipv4());
+
+        let (mut preferred, mut fallback) = SocketAddrs {
+            iter: vec![v4_addr, v6_addr].into_iter(),
+        }
+        .split_by_preference(Some(ip_v4), Some(ip_v6));
+        assert!(preferred.next().unwrap().is_ipv4());
+        assert!(fallback.next().unwrap().is_ipv6());
+
+        let (mut preferred, mut fallback) = SocketAddrs {
+            iter: vec![v6_addr, v4_addr].into_iter(),
+        }
+        .split_by_preference(Some(ip_v4), Some(ip_v6));
+        assert!(preferred.next().unwrap().is_ipv6());
+        assert!(fallback.next().unwrap().is_ipv4());
+
+        let (mut preferred, fallback) = SocketAddrs {
+            iter: vec![v4_addr, v6_addr].into_iter(),
+        }
+        .split_by_preference(Some(ip_v4), None);
+        assert!(preferred.next().unwrap().is_ipv4());
+        assert!(fallback.is_empty());
+
+        let (mut preferred, fallback) = SocketAddrs {
+            iter: vec![v4_addr, v6_addr].into_iter(),
+        }
+        .split_by_preference(None, Some(ip_v6));
+        assert!(preferred.next().unwrap().is_ipv6());
+        assert!(fallback.is_empty());
+    }
+
+    #[test]
+    fn test_name_from_str() {
+        const DOMAIN: &str = "test.example.com";
+        let name = Name::from_str(DOMAIN).expect("Should be a valid domain");
+        assert_eq!(name.as_str(), DOMAIN);
+        assert_eq!(name.to_string(), DOMAIN);
+    }
+}

zeroidc/vendor/hyper/src/client/connect/mod.rs

@@ -0,0 +1,412 @@
+//! Connectors used by the `Client`.
+//!
+//! This module contains:
+//!
+//! - A default [`HttpConnector`][] that does DNS resolution and establishes
+//!   connections over TCP.
+//! - Types to build custom connectors.
+//!
+//! # Connectors
+//!
+//! A "connector" is a [`Service`][] that takes a [`Uri`][] destination, and
+//! its `Response` is some type implementing [`AsyncRead`][], [`AsyncWrite`][],
+//! and [`Connection`][].
+//!
+//! ## Custom Connectors
+//!
+//! A simple connector that ignores the `Uri` destination and always returns
+//! a TCP connection to the same address could be written like this:
+//!
+//! ```rust,ignore
+//! let connector = tower::service_fn(|_dst| async {
+//!     tokio::net::TcpStream::connect("127.0.0.1:1337")
+//! })
+//! ```
+//!
+//! Or, fully written out:
+//!
+//! ```
+//! # #[cfg(feature = "runtime")]
+//! # mod rt {
+//! use std::{future::Future, net::SocketAddr, pin::Pin, task::{self, Poll}};
+//! use hyper::{service::Service, Uri};
+//! use tokio::net::TcpStream;
+//!
+//! #[derive(Clone)]
+//! struct LocalConnector;
+//!
+//! impl Service<Uri> for LocalConnector {
+//!     type Response = TcpStream;
+//!     type Error = std::io::Error;
+//!     // We can't "name" an `async` generated future.
+//!     type Future = Pin<Box<
+//!         dyn Future<Output = Result<Self::Response, Self::Error>> + Send
+//!     >>;
+//!
+//!     fn poll_ready(&mut self, _: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
+//!         // This connector is always ready, but others might not be.
+//!         Poll::Ready(Ok(()))
+//!     }
+//!
+//!     fn call(&mut self, _: Uri) -> Self::Future {
+//!         Box::pin(TcpStream::connect(SocketAddr::from(([127, 0, 0, 1], 1337))))
+//!     }
+//! }
+//! # }
+//! ```
+//!
+//! It's worth noting that for `TcpStream`s, the [`HttpConnector`][] is a
+//! better starting place to extend from.
+//!
+//! Using either of the above connector examples, it can be used with the
+//! `Client` like this:
+//!
+//! ```
+//! # #[cfg(feature = "runtime")]
+//! # fn rt () {
+//! # let connector = hyper::client::HttpConnector::new();
+//! // let connector = ...
+//!
+//! let client = hyper::Client::builder()
+//!     .build::<_, hyper::Body>(connector);
+//! # }
+//! ```
+//!
+//!
+//! [`HttpConnector`]: HttpConnector
+//! [`Service`]: crate::service::Service
+//! [`Uri`]: ::http::Uri
+//! [`AsyncRead`]: tokio::io::AsyncRead
+//! [`AsyncWrite`]: tokio::io::AsyncWrite
+//! [`Connection`]: Connection
+use std::fmt;
+
+use ::http::Extensions;
+
+cfg_feature! {
+    #![feature = "tcp"]
+
+    pub use self::http::{HttpConnector, HttpInfo};
+
+    pub mod dns;
+    mod http;
+}
+
+cfg_feature! {
+    #![any(feature = "http1", feature = "http2")]
+
+    pub use self::sealed::Connect;
+}
+
+/// Describes a type returned by a connector.
+pub trait Connection {
+    /// Return metadata describing the connection.
+    fn connected(&self) -> Connected;
+}
+
+/// Extra information about the connected transport.
+///
+/// This can be used to inform recipients about things like if ALPN
+/// was used, or if connected to an HTTP proxy.
+#[derive(Debug)]
+pub struct Connected {
+    pub(super) alpn: Alpn,
+    pub(super) is_proxied: bool,
+    pub(super) extra: Option<Extra>,
+}
+
+pub(super) struct Extra(Box<dyn ExtraInner>);
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub(super) enum Alpn {
+    H2,
+    None,
+}
+
+impl Connected {
+    /// Create new `Connected` type with empty metadata.
+    pub fn new() -> Connected {
+        Connected {
+            alpn: Alpn::None,
+            is_proxied: false,
+            extra: None,
+        }
+    }
+
+    /// Set whether the connected transport is to an HTTP proxy.
+    ///
+    /// This setting will affect if HTTP/1 requests written on the transport
+    /// will have the request-target in absolute-form or origin-form:
+    ///
+    /// - When `proxy(false)`:
+    ///
+    /// ```http
+    /// GET /guide HTTP/1.1
+    /// ```
+    ///
+    /// - When `proxy(true)`:
+    ///
+    /// ```http
+    /// GET http://hyper.rs/guide HTTP/1.1
+    /// ```
+    ///
+    /// Default is `false`.
+    pub fn proxy(mut self, is_proxied: bool) -> Connected {
+        self.is_proxied = is_proxied;
+        self
+    }
+
+    /// Determines if the connected transport is to an HTTP proxy.
+    pub fn is_proxied(&self) -> bool {
+        self.is_proxied
+    }
+
+    /// Set extra connection information to be set in the extensions of every `Response`.
+    pub fn extra<T: Clone + Send + Sync + 'static>(mut self, extra: T) -> Connected {
+        if let Some(prev) = self.extra {
+            self.extra = Some(Extra(Box::new(ExtraChain(prev.0, extra))));
+        } else {
+            self.extra = Some(Extra(Box::new(ExtraEnvelope(extra))));
+        }
+        self
+    }
+
+    /// Copies the extra connection information into an `Extensions` map.
+    pub fn get_extras(&self, extensions: &mut Extensions) {
+        if let Some(extra) = &self.extra {
+            extra.set(extensions);
+        }
+    }
+
+    /// Set that the connected transport negotiated HTTP/2 as its next protocol.
+    pub fn negotiated_h2(mut self) -> Connected {
+        self.alpn = Alpn::H2;
+        self
+    }
+
+    /// Determines if the connected transport negotiated HTTP/2 as its next protocol.
+    pub fn is_negotiated_h2(&self) -> bool {
+        self.alpn == Alpn::H2
+    }
+
+    // Don't public expose that `Connected` is `Clone`, unsure if we want to
+    // keep that contract...
+    #[cfg(feature = "http2")]
+    pub(super) fn clone(&self) -> Connected {
+        Connected {
+            alpn: self.alpn.clone(),
+            is_proxied: self.is_proxied,
+            extra: self.extra.clone(),
+        }
+    }
+}
+
+// ===== impl Extra =====
+
+impl Extra {
+    pub(super) fn set(&self, res: &mut Extensions) {
+        self.0.set(res);
+    }
+}
+
+impl Clone for Extra {
+    fn clone(&self) -> Extra {
+        Extra(self.0.clone_box())
+    }
+}
+
+impl fmt::Debug for Extra {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Extra").finish()
+    }
+}
+
+trait ExtraInner: Send + Sync {
+    fn clone_box(&self) -> Box<dyn ExtraInner>;
+    fn set(&self, res: &mut Extensions);
+}
+
+// This indirection allows the `Connected` to have a type-erased "extra" value,
+// while that type still knows its inner extra type. This allows the correct
+// TypeId to be used when inserting into `res.extensions_mut()`.
+#[derive(Clone)]
+struct ExtraEnvelope<T>(T);
+
+impl<T> ExtraInner for ExtraEnvelope<T>
+where
+    T: Clone + Send + Sync + 'static,
+{
+    fn clone_box(&self) -> Box<dyn ExtraInner> {
+        Box::new(self.clone())
+    }
+
+    fn set(&self, res: &mut Extensions) {
+        res.insert(self.0.clone());
+    }
+}
+
+struct ExtraChain<T>(Box<dyn ExtraInner>, T);
+
+impl<T: Clone> Clone for ExtraChain<T> {
+    fn clone(&self) -> Self {
+        ExtraChain(self.0.clone_box(), self.1.clone())
+    }
+}
+
+impl<T> ExtraInner for ExtraChain<T>
+where
+    T: Clone + Send + Sync + 'static,
+{
+    fn clone_box(&self) -> Box<dyn ExtraInner> {
+        Box::new(self.clone())
+    }
+
+    fn set(&self, res: &mut Extensions) {
+        self.0.set(res);
+        res.insert(self.1.clone());
+    }
+}
+
+#[cfg(any(feature = "http1", feature = "http2"))]
+pub(super) mod sealed {
+    use std::error::Error as StdError;
+
+    use ::http::Uri;
+    use tokio::io::{AsyncRead, AsyncWrite};
+
+    use super::Connection;
+    use crate::common::{Future, Unpin};
+
+    /// Connect to a destination, returning an IO transport.
+    ///
+    /// A connector receives a [`Uri`](::http::Uri) and returns a `Future` of the
+    /// ready connection.
+    ///
+    /// # Trait Alias
+    ///
+    /// This is really just an *alias* for the `tower::Service` trait, with
+    /// additional bounds set for convenience *inside* hyper. You don't actually
+    /// implement this trait, but `tower::Service<Uri>` instead.
+    // The `Sized` bound is to prevent creating `dyn Connect`, since they cannot
+    // fit the `Connect` bounds because of the blanket impl for `Service`.
+    pub trait Connect: Sealed + Sized {
+        #[doc(hidden)]
+        type _Svc: ConnectSvc;
+        #[doc(hidden)]
+        fn connect(self, internal_only: Internal, dst: Uri) -> <Self::_Svc as ConnectSvc>::Future;
+    }
+
+    pub trait ConnectSvc {
+        type Connection: AsyncRead + AsyncWrite + Connection + Unpin + Send + 'static;
+        type Error: Into<Box<dyn StdError + Send + Sync>>;
+        type Future: Future<Output = Result<Self::Connection, Self::Error>> + Unpin + Send + 'static;
+
+        fn connect(self, internal_only: Internal, dst: Uri) -> Self::Future;
+    }
+
+    impl<S, T> Connect for S
+    where
+        S: tower_service::Service<Uri, Response = T> + Send + 'static,
+        S::Error: Into<Box<dyn StdError + Send + Sync>>,
+        S::Future: Unpin + Send,
+        T: AsyncRead + AsyncWrite + Connection + Unpin + Send + 'static,
+    {
+        type _Svc = S;
+
+        fn connect(self, _: Internal, dst: Uri) -> crate::service::Oneshot<S, Uri> {
+            crate::service::oneshot(self, dst)
+        }
+    }
+
+    impl<S, T> ConnectSvc for S
+    where
+        S: tower_service::Service<Uri, Response = T> + Send + 'static,
+        S::Error: Into<Box<dyn StdError + Send + Sync>>,
+        S::Future: Unpin + Send,
+        T: AsyncRead + AsyncWrite + Connection + Unpin + Send + 'static,
+    {
+        type Connection = T;
+        type Error = S::Error;
+        type Future = crate::service::Oneshot<S, Uri>;
+
+        fn connect(self, _: Internal, dst: Uri) -> Self::Future {
+            crate::service::oneshot(self, dst)
+        }
+    }
+
+    impl<S, T> Sealed for S
+    where
+        S: tower_service::Service<Uri, Response = T> + Send,
+        S::Error: Into<Box<dyn StdError + Send + Sync>>,
+        S::Future: Unpin + Send,
+        T: AsyncRead + AsyncWrite + Connection + Unpin + Send + 'static,
+    {
+    }
+
+    pub trait Sealed {}
+    #[allow(missing_debug_implementations)]
+    pub struct Internal;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Connected;
+
+    #[derive(Clone, Debug, PartialEq)]
+    struct Ex1(usize);
+
+    #[derive(Clone, Debug, PartialEq)]
+    struct Ex2(&'static str);
+
+    #[derive(Clone, Debug, PartialEq)]
+    struct Ex3(&'static str);
+
+    #[test]
+    fn test_connected_extra() {
+        let c1 = Connected::new().extra(Ex1(41));
+
+        let mut ex = ::http::Extensions::new();
+
+        assert_eq!(ex.get::<Ex1>(), None);
+
+        c1.extra.as_ref().expect("c1 extra").set(&mut ex);
+
+        assert_eq!(ex.get::<Ex1>(), Some(&Ex1(41)));
+    }
+
+    #[test]
+    fn test_connected_extra_chain() {
+        // If a user composes connectors and at each stage, there's "extra"
+        // info to attach, it shouldn't override the previous extras.
+
+        let c1 = Connected::new()
+            .extra(Ex1(45))
+            .extra(Ex2("zoom"))
+            .extra(Ex3("pew pew"));
+
+        let mut ex1 = ::http::Extensions::new();
+
+        assert_eq!(ex1.get::<Ex1>(), None);
+        assert_eq!(ex1.get::<Ex2>(), None);
+        assert_eq!(ex1.get::<Ex3>(), None);
+
+        c1.extra.as_ref().expect("c1 extra").set(&mut ex1);
+
+        assert_eq!(ex1.get::<Ex1>(), Some(&Ex1(45)));
+        assert_eq!(ex1.get::<Ex2>(), Some(&Ex2("zoom")));
+        assert_eq!(ex1.get::<Ex3>(), Some(&Ex3("pew pew")));
+
+        // Just like extensions, inserting the same type overrides previous type.
+        let c2 = Connected::new()
+            .extra(Ex1(33))
+            .extra(Ex2("hiccup"))
+            .extra(Ex1(99));
+
+        let mut ex2 = ::http::Extensions::new();
+
+        c2.extra.as_ref().expect("c2 extra").set(&mut ex2);
+
+        assert_eq!(ex2.get::<Ex1>(), Some(&Ex1(99)));
+        assert_eq!(ex2.get::<Ex2>(), Some(&Ex2("hiccup")));
+    }
+}