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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/hyper-0.14.26/src/client/connect/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../hyper/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../hyper/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! 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 &quot;connector&quot; 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(&quot;127.0.0.1:1337&quot;)
 //! })
 //! ```
 //!
 //! Or, fully written out:
 //!
 //! ```
 //! # #[cfg(feature = &quot;runtime&quot;)]
 //! # 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&lt;Uri&gt; for LocalConnector {
 //!     type Response = TcpStream;
 //!     type Error = std::io::Error;
 //!     // We can&#39;t &quot;name&quot; an `async` generated future.
 //!     type Future = Pin&lt;Box&lt;
 //!         dyn Future&lt;Output = Result&lt;Self::Response, Self::Error&gt;&gt; + Send
 //!     &gt;&gt;;
 //!
 //!     fn poll_ready(&amp;mut self, _: &amp;mut task::Context&lt;&#39;_&gt;) -&gt; Poll&lt;Result&lt;(), Self::Error&gt;&gt; {
 //!         // This connector is always ready, but others might not be.
 //!         Poll::Ready(Ok(()))
 //!     }
 //!
 //!     fn call(&amp;mut self, _: Uri) -&gt; Self::Future {
 //!         Box::pin(TcpStream::connect(SocketAddr::from(([127, 0, 0, 1], 1337))))
 //!     }
 //! }
 //! # }
 //! ```
 //!
 //! It&#39;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 = &quot;runtime&quot;)]
 //! # fn rt () {
 //! # let connector = hyper::client::HttpConnector::new();
 //! // let connector = ...
 //!
 //! let client = hyper::Client::builder()
 //!     .build::&lt;_, hyper::Body&gt;(connector);
 //! # }
 //! ```
 //!
 //!
 //! [`HttpConnector`]: HttpConnector
 //! [`Service`]: crate::service::Service
 //! [`Uri`]: ::http::Uri
 //! [`AsyncRead`]: tokio::io::AsyncRead
 //! [`AsyncWrite`]: tokio::io::AsyncWrite
 //! [`Connection`]: Connection
 </span><span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::fmt::{Debug, Formatter};
 <span class="kw">use </span>std::sync::atomic::{AtomicBool, Ordering};
 <span class="kw">use </span>std::ops::Deref;
 <span class="kw">use </span>std::sync::Arc;

 <span class="kw">use </span>::http::Extensions;
 <span class="kw">use </span>tokio::sync::watch;

 <span class="macro">cfg_feature! </span>{
     <span class="attribute">#![feature = <span class="string">&quot;tcp&quot;</span>]

     </span><span class="kw">pub use </span><span class="self">self</span>::http::{HttpConnector, HttpInfo};

     <span class="kw">pub mod </span>dns;
     <span class="kw">mod </span>http;
 }

 <span class="macro">cfg_feature! </span>{
     <span class="attribute">#![any(feature = <span class="string">&quot;http1&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>)]

     </span><span class="kw">pub use </span><span class="self">self</span>::sealed::Connect;
 }

 <span class="doccomment">/// Describes a type returned by a connector.
 </span><span class="kw">pub trait </span>Connection {
     <span class="doccomment">/// Return metadata describing the connection.
     </span><span class="kw">fn </span>connected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Connected;
 }

 <span class="doccomment">/// 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.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Connected {
     <span class="kw">pub</span>(<span class="kw">super</span>) alpn: Alpn,
     <span class="kw">pub</span>(<span class="kw">super</span>) is_proxied: bool,
     <span class="kw">pub</span>(<span class="kw">super</span>) extra: <span class="prelude-ty">Option</span>&lt;Extra&gt;,
     <span class="kw">pub</span>(<span class="kw">super</span>) poisoned: PoisonPill,
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>PoisonPill {
     poisoned: Arc&lt;AtomicBool&gt;,
 }

 <span class="kw">impl </span>Debug <span class="kw">for </span>PoisonPill {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="comment">// print the address of the pill—this makes debugging issues much easier
         </span><span class="macro">write!</span>(f, <span class="string">&quot;PoisonPill@{:p} {{ poisoned: {} }}&quot;</span>, <span class="self">self</span>.poisoned, <span class="self">self</span>.poisoned.load(Ordering::Relaxed))
     }
 }

 <span class="kw">impl </span>PoisonPill {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>healthy() -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             poisoned: Arc::new(AtomicBool::new(<span class="bool-val">false</span>)),
         }
     }
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poison(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="self">self</span>.poisoned.store(<span class="bool-val">true</span>, Ordering::Relaxed)
     }

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>poisoned(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.poisoned.load(Ordering::Relaxed)
     }
 }

 <span class="doccomment">/// [`CaptureConnection`] allows callers to capture [`Connected`] information
 ///
 /// To capture a connection for a request, use [`capture_connection`].
 </span><span class="attribute">#[derive(Debug, Clone)]
 </span><span class="kw">pub struct </span>CaptureConnection {
     rx: watch::Receiver&lt;<span class="prelude-ty">Option</span>&lt;Connected&gt;&gt;,
 }

 <span class="doccomment">/// Capture the connection for a given request
 ///
 /// When making a request with Hyper, the underlying connection must implement the [`Connection`] trait.
 /// [`capture_connection`] allows a caller to capture the returned [`Connected`] structure as soon
 /// as the connection is established.
 ///
 /// *Note*: If establishing a connection fails, [`CaptureConnection::connection_metadata`] will always return none.
 ///
 /// # Examples
 ///
 /// **Synchronous access**:
 /// The [`CaptureConnection::connection_metadata`] method allows callers to check if a connection has been
 /// established. This is ideal for situations where you are certain the connection has already
 /// been established (e.g. after the response future has already completed).
 /// ```rust
 /// use hyper::client::connect::{capture_connection, CaptureConnection};
 /// let mut request = http::Request::builder()
 ///   .uri(&quot;http://foo.com&quot;)
 ///   .body(())
 ///   .unwrap();
 ///
 /// let captured_connection = capture_connection(&amp;mut request);
 /// // some time later after the request has been sent...
 /// let connection_info = captured_connection.connection_metadata();
 /// println!(&quot;we are connected! {:?}&quot;, connection_info.as_ref());
 /// ```
 ///
 /// **Asynchronous access**:
 /// The [`CaptureConnection::wait_for_connection_metadata`] method returns a future resolves as soon as the
 /// connection is available.
 ///
 /// ```rust
 /// # #[cfg(feature  = &quot;runtime&quot;)]
 /// # async fn example() {
 /// use hyper::client::connect::{capture_connection, CaptureConnection};
 /// let mut request = http::Request::builder()
 ///   .uri(&quot;http://foo.com&quot;)
 ///   .body(hyper::Body::empty())
 ///   .unwrap();
 ///
 /// let mut captured = capture_connection(&amp;mut request);
 /// tokio::task::spawn(async move {
 ///     let connection_info = captured.wait_for_connection_metadata().await;
 ///     println!(&quot;we are connected! {:?}&quot;, connection_info.as_ref());
 /// });
 ///
 /// let client = hyper::Client::new();
 /// client.request(request).await.expect(&quot;request failed&quot;);
 /// # }
 /// ```
 </span><span class="kw">pub fn </span>capture_connection&lt;B&gt;(request: <span class="kw-2">&amp;mut </span><span class="kw">crate</span>::http::Request&lt;B&gt;) -&gt; CaptureConnection {
     <span class="kw">let </span>(tx, rx) = CaptureConnection::new();
     request.extensions_mut().insert(tx);
     rx
 }

 <span class="doccomment">/// TxSide for [`CaptureConnection`]
 ///
 /// This is inserted into `Extensions` to allow Hyper to back channel connection info
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>CaptureConnectionExtension {
     tx: Arc&lt;watch::Sender&lt;<span class="prelude-ty">Option</span>&lt;Connected&gt;&gt;&gt;,
 }

 <span class="kw">impl </span>CaptureConnectionExtension {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set(<span class="kw-2">&amp;</span><span class="self">self</span>, connected: <span class="kw-2">&amp;</span>Connected) {
         <span class="self">self</span>.tx.send_replace(<span class="prelude-val">Some</span>(connected.clone()));
     }
 }

 <span class="kw">impl </span>CaptureConnection {
     <span class="doccomment">/// Internal API to create the tx and rx half of [`CaptureConnection`]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -&gt; (CaptureConnectionExtension, <span class="self">Self</span>) {
         <span class="kw">let </span>(tx, rx) = watch::channel(<span class="prelude-val">None</span>);
         (
             CaptureConnectionExtension { tx: Arc::new(tx) },
             CaptureConnection { rx },
         )
     }

     <span class="doccomment">/// Retrieve the connection metadata, if available
     </span><span class="kw">pub fn </span>connection_metadata(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">impl </span>Deref&lt;Target = <span class="prelude-ty">Option</span>&lt;Connected&gt;&gt; + <span class="lifetime">&#39;_ </span>{
         <span class="self">self</span>.rx.borrow()
     }

     <span class="doccomment">/// Wait for the connection to be established
     ///
     /// If a connection was established, this will always return `Some(...)`. If the request never
     /// successfully connected (e.g. DNS resolution failure), this method will never return.
     </span><span class="kw">pub async fn </span>wait_for_connection_metadata(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
     ) -&gt; <span class="kw">impl </span>Deref&lt;Target = <span class="prelude-ty">Option</span>&lt;Connected&gt;&gt; + <span class="lifetime">&#39;_ </span>{
         <span class="kw">if </span><span class="self">self</span>.rx.borrow().is_some() {
             <span class="kw">return </span><span class="self">self</span>.rx.borrow();
         }
         <span class="kw">let _ </span>= <span class="self">self</span>.rx.changed().<span class="kw">await</span>;
         <span class="self">self</span>.rx.borrow()
     }
 }

 <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Extra(Box&lt;<span class="kw">dyn </span>ExtraInner&gt;);

 <span class="attribute">#[derive(Clone, Copy, Debug, PartialEq)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Alpn {
     H2,
     <span class="prelude-val">None</span>,
 }

 <span class="kw">impl </span>Connected {
     <span class="doccomment">/// Create new `Connected` type with empty metadata.
     </span><span class="kw">pub fn </span>new() -&gt; Connected {
         Connected {
             alpn: Alpn::None,
             is_proxied: <span class="bool-val">false</span>,
             extra: <span class="prelude-val">None</span>,
             poisoned: PoisonPill::healthy(),
         }
     }

     <span class="doccomment">/// 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`.
     </span><span class="kw">pub fn </span>proxy(<span class="kw-2">mut </span><span class="self">self</span>, is_proxied: bool) -&gt; Connected {
         <span class="self">self</span>.is_proxied = is_proxied;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Determines if the connected transport is to an HTTP proxy.
     </span><span class="kw">pub fn </span>is_proxied(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.is_proxied
     }

     <span class="doccomment">/// Set extra connection information to be set in the extensions of every `Response`.
     </span><span class="kw">pub fn </span>extra&lt;T: Clone + Send + Sync + <span class="lifetime">&#39;static</span>&gt;(<span class="kw-2">mut </span><span class="self">self</span>, extra: T) -&gt; Connected {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(prev) = <span class="self">self</span>.extra {
             <span class="self">self</span>.extra = <span class="prelude-val">Some</span>(Extra(Box::new(ExtraChain(prev.<span class="number">0</span>, extra))));
         } <span class="kw">else </span>{
             <span class="self">self</span>.extra = <span class="prelude-val">Some</span>(Extra(Box::new(ExtraEnvelope(extra))));
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Copies the extra connection information into an `Extensions` map.
     </span><span class="kw">pub fn </span>get_extras(<span class="kw-2">&amp;</span><span class="self">self</span>, extensions: <span class="kw-2">&amp;mut </span>Extensions) {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(extra) = <span class="kw-2">&amp;</span><span class="self">self</span>.extra {
             extra.set(extensions);
         }
     }

     <span class="doccomment">/// Set that the connected transport negotiated HTTP/2 as its next protocol.
     </span><span class="kw">pub fn </span>negotiated_h2(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; Connected {
         <span class="self">self</span>.alpn = Alpn::H2;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Determines if the connected transport negotiated HTTP/2 as its next protocol.
     </span><span class="kw">pub fn </span>is_negotiated_h2(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.alpn == Alpn::H2
     }

     <span class="doccomment">/// Poison this connection
     ///
     /// A poisoned connection will not be reused for subsequent requests by the pool
     </span><span class="kw">pub fn </span>poison(<span class="kw-2">&amp;</span><span class="self">self</span>) {
         <span class="self">self</span>.poisoned.poison();
         <span class="macro">tracing::debug!</span>(
             poison_pill = <span class="question-mark">?</span><span class="self">self</span>.poisoned, <span class="string">&quot;connection was poisoned&quot;
         </span>);
     }

     <span class="comment">// Don&#39;t public expose that `Connected` is `Clone`, unsure if we want to
     // keep that contract...
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Connected {
         Connected {
             alpn: <span class="self">self</span>.alpn.clone(),
             is_proxied: <span class="self">self</span>.is_proxied,
             extra: <span class="self">self</span>.extra.clone(),
             poisoned: <span class="self">self</span>.poisoned.clone(),
         }
     }
 }

 <span class="comment">// ===== impl Extra =====

 </span><span class="kw">impl </span>Extra {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>set(<span class="kw-2">&amp;</span><span class="self">self</span>, res: <span class="kw-2">&amp;mut </span>Extensions) {
         <span class="self">self</span>.<span class="number">0</span>.set(res);
     }
 }

 <span class="kw">impl </span>Clone <span class="kw">for </span>Extra {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Extra {
         Extra(<span class="self">self</span>.<span class="number">0</span>.clone_box())
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Extra {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;Extra&quot;</span>).finish()
     }
 }

 <span class="kw">trait </span>ExtraInner: Send + Sync {
     <span class="kw">fn </span>clone_box(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Box&lt;<span class="kw">dyn </span>ExtraInner&gt;;
     <span class="kw">fn </span>set(<span class="kw-2">&amp;</span><span class="self">self</span>, res: <span class="kw-2">&amp;mut </span>Extensions);
 }

 <span class="comment">// This indirection allows the `Connected` to have a type-erased &quot;extra&quot; value,
 // while that type still knows its inner extra type. This allows the correct
 // TypeId to be used when inserting into `res.extensions_mut()`.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">struct </span>ExtraEnvelope&lt;T&gt;(T);

 <span class="kw">impl</span>&lt;T&gt; ExtraInner <span class="kw">for </span>ExtraEnvelope&lt;T&gt;
 <span class="kw">where
     </span>T: Clone + Send + Sync + <span class="lifetime">&#39;static</span>,
 {
     <span class="kw">fn </span>clone_box(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Box&lt;<span class="kw">dyn </span>ExtraInner&gt; {
         Box::new(<span class="self">self</span>.clone())
     }

     <span class="kw">fn </span>set(<span class="kw-2">&amp;</span><span class="self">self</span>, res: <span class="kw-2">&amp;mut </span>Extensions) {
         res.insert(<span class="self">self</span>.<span class="number">0</span>.clone());
     }
 }

 <span class="kw">struct </span>ExtraChain&lt;T&gt;(Box&lt;<span class="kw">dyn </span>ExtraInner&gt;, T);

 <span class="kw">impl</span>&lt;T: Clone&gt; Clone <span class="kw">for </span>ExtraChain&lt;T&gt; {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         ExtraChain(<span class="self">self</span>.<span class="number">0</span>.clone_box(), <span class="self">self</span>.<span class="number">1</span>.clone())
     }
 }

 <span class="kw">impl</span>&lt;T&gt; ExtraInner <span class="kw">for </span>ExtraChain&lt;T&gt;
 <span class="kw">where
     </span>T: Clone + Send + Sync + <span class="lifetime">&#39;static</span>,
 {
     <span class="kw">fn </span>clone_box(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Box&lt;<span class="kw">dyn </span>ExtraInner&gt; {
         Box::new(<span class="self">self</span>.clone())
     }

     <span class="kw">fn </span>set(<span class="kw-2">&amp;</span><span class="self">self</span>, res: <span class="kw-2">&amp;mut </span>Extensions) {
         <span class="self">self</span>.<span class="number">0</span>.set(res);
         res.insert(<span class="self">self</span>.<span class="number">1</span>.clone());
     }
 }

 <span class="attribute">#[cfg(any(feature = <span class="string">&quot;http1&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>))]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">mod </span>sealed {
     <span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;

     <span class="kw">use </span>::http::Uri;
     <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite};

     <span class="kw">use </span><span class="kw">super</span>::Connection;
     <span class="kw">use </span><span class="kw">crate</span>::common::{Future, Unpin};

     <span class="doccomment">/// 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&#39;t actually
     /// implement this trait, but `tower::Service&lt;Uri&gt;` instead.
     </span><span class="comment">// The `Sized` bound is to prevent creating `dyn Connect`, since they cannot
     // fit the `Connect` bounds because of the blanket impl for `Service`.
     </span><span class="kw">pub trait </span>Connect: Sealed + Sized {
         <span class="attribute">#[doc(hidden)]
         </span><span class="kw">type </span>_Svc: ConnectSvc;
         <span class="attribute">#[doc(hidden)]
         </span><span class="kw">fn </span>connect(<span class="self">self</span>, internal_only: Internal, dst: Uri) -&gt; &lt;<span class="self">Self</span>::_Svc <span class="kw">as </span>ConnectSvc&gt;::Future;
     }

     <span class="kw">pub trait </span>ConnectSvc {
         <span class="kw">type </span>Connection: AsyncRead + AsyncWrite + Connection + Unpin + Send + <span class="lifetime">&#39;static</span>;
         <span class="kw">type </span>Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;;
         <span class="kw">type </span>Future: Future&lt;Output = <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Connection, <span class="self">Self</span>::Error&gt;&gt; + Unpin + Send + <span class="lifetime">&#39;static</span>;

         <span class="kw">fn </span>connect(<span class="self">self</span>, internal_only: Internal, dst: Uri) -&gt; <span class="self">Self</span>::Future;
     }

     <span class="kw">impl</span>&lt;S, T&gt; Connect <span class="kw">for </span>S
     <span class="kw">where
         </span>S: tower_service::Service&lt;Uri, Response = T&gt; + Send + <span class="lifetime">&#39;static</span>,
         S::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
         S::Future: Unpin + Send,
         T: AsyncRead + AsyncWrite + Connection + Unpin + Send + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">type </span>_Svc = S;

         <span class="kw">fn </span>connect(<span class="self">self</span>, <span class="kw">_</span>: Internal, dst: Uri) -&gt; <span class="kw">crate</span>::service::Oneshot&lt;S, Uri&gt; {
             <span class="kw">crate</span>::service::oneshot(<span class="self">self</span>, dst)
         }
     }

     <span class="kw">impl</span>&lt;S, T&gt; ConnectSvc <span class="kw">for </span>S
     <span class="kw">where
         </span>S: tower_service::Service&lt;Uri, Response = T&gt; + Send + <span class="lifetime">&#39;static</span>,
         S::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
         S::Future: Unpin + Send,
         T: AsyncRead + AsyncWrite + Connection + Unpin + Send + <span class="lifetime">&#39;static</span>,
     {
         <span class="kw">type </span>Connection = T;
         <span class="kw">type </span>Error = S::Error;
         <span class="kw">type </span>Future = <span class="kw">crate</span>::service::Oneshot&lt;S, Uri&gt;;

         <span class="kw">fn </span>connect(<span class="self">self</span>, <span class="kw">_</span>: Internal, dst: Uri) -&gt; <span class="self">Self</span>::Future {
             <span class="kw">crate</span>::service::oneshot(<span class="self">self</span>, dst)
         }
     }

     <span class="kw">impl</span>&lt;S, T&gt; Sealed <span class="kw">for </span>S
     <span class="kw">where
         </span>S: tower_service::Service&lt;Uri, Response = T&gt; + Send,
         S::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
         S::Future: Unpin + Send,
         T: AsyncRead + AsyncWrite + Connection + Unpin + Send + <span class="lifetime">&#39;static</span>,
     {
     }

     <span class="kw">pub trait </span>Sealed {}
     <span class="attribute">#[allow(missing_debug_implementations)]
     </span><span class="kw">pub struct </span>Internal;
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span><span class="kw">super</span>::Connected;
     <span class="kw">use </span><span class="kw">crate</span>::client::connect::CaptureConnection;

     <span class="attribute">#[derive(Clone, Debug, PartialEq)]
     </span><span class="kw">struct </span>Ex1(usize);

     <span class="attribute">#[derive(Clone, Debug, PartialEq)]
     </span><span class="kw">struct </span>Ex2(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str);

     <span class="attribute">#[derive(Clone, Debug, PartialEq)]
     </span><span class="kw">struct </span>Ex3(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str);

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_connected_extra() {
         <span class="kw">let </span>c1 = Connected::new().extra(Ex1(<span class="number">41</span>));

         <span class="kw">let </span><span class="kw-2">mut </span>ex = ::http::Extensions::new();

         <span class="macro">assert_eq!</span>(ex.get::&lt;Ex1&gt;(), <span class="prelude-val">None</span>);

         c1.extra.as_ref().expect(<span class="string">&quot;c1 extra&quot;</span>).set(<span class="kw-2">&amp;mut </span>ex);

         <span class="macro">assert_eq!</span>(ex.get::&lt;Ex1&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex1(<span class="number">41</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_connected_extra_chain() {
         <span class="comment">// If a user composes connectors and at each stage, there&#39;s &quot;extra&quot;
         // info to attach, it shouldn&#39;t override the previous extras.

         </span><span class="kw">let </span>c1 = Connected::new()
             .extra(Ex1(<span class="number">45</span>))
             .extra(Ex2(<span class="string">&quot;zoom&quot;</span>))
             .extra(Ex3(<span class="string">&quot;pew pew&quot;</span>));

         <span class="kw">let </span><span class="kw-2">mut </span>ex1 = ::http::Extensions::new();

         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex1&gt;(), <span class="prelude-val">None</span>);
         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex2&gt;(), <span class="prelude-val">None</span>);
         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex3&gt;(), <span class="prelude-val">None</span>);

         c1.extra.as_ref().expect(<span class="string">&quot;c1 extra&quot;</span>).set(<span class="kw-2">&amp;mut </span>ex1);

         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex1&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex1(<span class="number">45</span>)));
         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex2&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex2(<span class="string">&quot;zoom&quot;</span>)));
         <span class="macro">assert_eq!</span>(ex1.get::&lt;Ex3&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex3(<span class="string">&quot;pew pew&quot;</span>)));

         <span class="comment">// Just like extensions, inserting the same type overrides previous type.
         </span><span class="kw">let </span>c2 = Connected::new()
             .extra(Ex1(<span class="number">33</span>))
             .extra(Ex2(<span class="string">&quot;hiccup&quot;</span>))
             .extra(Ex1(<span class="number">99</span>));

         <span class="kw">let </span><span class="kw-2">mut </span>ex2 = ::http::Extensions::new();

         c2.extra.as_ref().expect(<span class="string">&quot;c2 extra&quot;</span>).set(<span class="kw-2">&amp;mut </span>ex2);

         <span class="macro">assert_eq!</span>(ex2.get::&lt;Ex1&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex1(<span class="number">99</span>)));
         <span class="macro">assert_eq!</span>(ex2.get::&lt;Ex2&gt;(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Ex2(<span class="string">&quot;hiccup&quot;</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_sync_capture_connection() {
         <span class="kw">let </span>(tx, rx) = CaptureConnection::new();
         <span class="macro">assert!</span>(
             rx.connection_metadata().is_none(),
             <span class="string">&quot;connection has not been set&quot;
         </span>);
         tx.set(<span class="kw-2">&amp;</span>Connected::new().proxy(<span class="bool-val">true</span>));
         <span class="macro">assert_eq!</span>(
             rx.connection_metadata()
                 .as_ref()
                 .expect(<span class="string">&quot;connected should be set&quot;</span>)
                 .is_proxied(),
             <span class="bool-val">true
         </span>);

         <span class="comment">// ensure it can be called multiple times
         </span><span class="macro">assert_eq!</span>(
             rx.connection_metadata()
                 .as_ref()
                 .expect(<span class="string">&quot;connected should be set&quot;</span>)
                 .is_proxied(),
             <span class="bool-val">true
         </span>);
     }

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>async_capture_connection() {
         <span class="kw">let </span>(tx, <span class="kw-2">mut </span>rx) = CaptureConnection::new();
         <span class="macro">assert!</span>(
             rx.connection_metadata().is_none(),
             <span class="string">&quot;connection has not been set&quot;
         </span>);
         <span class="kw">let </span>test_task = tokio::spawn(<span class="kw">async move </span>{
             <span class="macro">assert_eq!</span>(
                 rx.wait_for_connection_metadata()
                     .<span class="kw">await
                     </span>.as_ref()
                     .expect(<span class="string">&quot;connection should be set&quot;</span>)
                     .is_proxied(),
                 <span class="bool-val">true
             </span>);
             <span class="comment">// can be awaited multiple times
             </span><span class="macro">assert!</span>(
                 rx.wait_for_connection_metadata().<span class="kw">await</span>.is_some(),
                 <span class="string">&quot;should be awaitable multiple times&quot;
             </span>);

             <span class="macro">assert_eq!</span>(rx.connection_metadata().is_some(), <span class="bool-val">true</span>);
         });
         <span class="comment">// can&#39;t be finished, we haven&#39;t set the connection yet
         </span><span class="macro">assert_eq!</span>(test_task.is_finished(), <span class="bool-val">false</span>);
         tx.set(<span class="kw-2">&amp;</span>Connected::new().proxy(<span class="bool-val">true</span>));

         <span class="macro">assert!</span>(test_task.<span class="kw">await</span>.is_ok());
     }

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>capture_connection_sender_side_dropped() {
         <span class="kw">let </span>(tx, <span class="kw-2">mut </span>rx) = CaptureConnection::new();
         <span class="macro">assert!</span>(
             rx.connection_metadata().is_none(),
             <span class="string">&quot;connection has not been set&quot;
         </span>);
         drop(tx);
         <span class="macro">assert!</span>(rx.wait_for_connection_metadata().<span class="kw">await</span>.is_none());
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="hyper" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>