| <!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/proto/h2/ping.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ping.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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| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
| </pre><pre class="rust"><code><span class="doccomment">/// HTTP2 Ping usage |
| /// |
| /// hyper uses HTTP2 pings for two purposes: |
| /// |
| /// 1. Adaptive flow control using BDP |
| /// 2. Connection keep-alive |
| /// |
| /// Both cases are optional. |
| /// |
| /// # BDP Algorithm |
| /// |
| /// 1. When receiving a DATA frame, if a BDP ping isn't outstanding: |
| /// 1a. Record current time. |
| /// 1b. Send a BDP ping. |
| /// 2. Increment the number of received bytes. |
| /// 3. When the BDP ping ack is received: |
| /// 3a. Record duration from sent time. |
| /// 3b. Merge RTT with a running average. |
| /// 3c. Calculate bdp as bytes/rtt. |
| /// 3d. If bdp is over 2/3 max, set new max to bdp and update windows. |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">use </span>std::fmt; |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">use </span>std::future::Future; |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::sync::{Arc, Mutex}; |
| <span class="kw">use </span>std::task::{<span class="self">self</span>, Poll}; |
| <span class="kw">use </span>std::time::Duration; |
| <span class="attribute">#[cfg(not(feature = <span class="string">"runtime"</span>))] |
| </span><span class="kw">use </span>std::time::Instant; |
| |
| <span class="kw">use </span>h2::{Ping, PingPong}; |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">use </span>tokio::time::{Instant, Sleep}; |
| <span class="kw">use </span>tracing::{debug, trace}; |
| |
| <span class="kw">type </span>WindowSize = u32; |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>disabled() -> Recorder { |
| Recorder { shared: <span class="prelude-val">None </span>} |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>channel(ping_pong: PingPong, config: Config) -> (Recorder, Ponger) { |
| <span class="macro">debug_assert!</span>( |
| config.is_enabled(), |
| <span class="string">"ping channel requires bdp or keep-alive config"</span>, |
| ); |
| |
| <span class="kw">let </span>bdp = config.bdp_initial_window.map(|wnd| Bdp { |
| bdp: wnd, |
| max_bandwidth: <span class="number">0.0</span>, |
| rtt: <span class="number">0.0</span>, |
| ping_delay: Duration::from_millis(<span class="number">100</span>), |
| stable_count: <span class="number">0</span>, |
| }); |
| |
| <span class="kw">let </span>(bytes, next_bdp_at) = <span class="kw">if </span>bdp.is_some() { |
| (<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="prelude-val">Some</span>(Instant::now())) |
| } <span class="kw">else </span>{ |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) |
| }; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">let </span>keep_alive = config.keep_alive_interval.map(|interval| KeepAlive { |
| interval, |
| timeout: config.keep_alive_timeout, |
| while_idle: config.keep_alive_while_idle, |
| timer: Box::pin(tokio::time::sleep(interval)), |
| state: KeepAliveState::Init, |
| }); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">let </span>last_read_at = keep_alive.as_ref().map(|<span class="kw">_</span>| Instant::now()); |
| |
| <span class="kw">let </span>shared = Arc::new(Mutex::new(Shared { |
| bytes, |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>last_read_at, |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>is_keep_alive_timed_out: <span class="bool-val">false</span>, |
| ping_pong, |
| ping_sent_at: <span class="prelude-val">None</span>, |
| next_bdp_at, |
| })); |
| |
| ( |
| Recorder { |
| shared: <span class="prelude-val">Some</span>(shared.clone()), |
| }, |
| Ponger { |
| bdp, |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>keep_alive, |
| shared, |
| }, |
| ) |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Config { |
| <span class="kw">pub</span>(<span class="kw">super</span>) bdp_initial_window: <span class="prelude-ty">Option</span><WindowSize>, |
| <span class="doccomment">/// If no frames are received in this amount of time, a PING frame is sent. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) keep_alive_interval: <span class="prelude-ty">Option</span><Duration>, |
| <span class="doccomment">/// After sending a keepalive PING, the connection will be closed if |
| /// a pong is not received in this amount of time. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) keep_alive_timeout: Duration, |
| <span class="doccomment">/// If true, sends pings even when there are no active streams. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) keep_alive_while_idle: bool, |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Recorder { |
| shared: <span class="prelude-ty">Option</span><Arc<Mutex<Shared>>>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Ponger { |
| bdp: <span class="prelude-ty">Option</span><Bdp>, |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>keep_alive: <span class="prelude-ty">Option</span><KeepAlive>, |
| shared: Arc<Mutex<Shared>>, |
| } |
| |
| <span class="kw">struct </span>Shared { |
| ping_pong: PingPong, |
| ping_sent_at: <span class="prelude-ty">Option</span><Instant>, |
| |
| <span class="comment">// bdp |
| </span><span class="doccomment">/// If `Some`, bdp is enabled, and this tracks how many bytes have been |
| /// read during the current sample. |
| </span>bytes: <span class="prelude-ty">Option</span><usize>, |
| <span class="doccomment">/// We delay a variable amount of time between BDP pings. This allows us |
| /// to send less pings as the bandwidth stabilizes. |
| </span>next_bdp_at: <span class="prelude-ty">Option</span><Instant>, |
| |
| <span class="comment">// keep-alive |
| </span><span class="doccomment">/// If `Some`, keep-alive is enabled, and the Instant is how long ago |
| /// the connection read the last frame. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>last_read_at: <span class="prelude-ty">Option</span><Instant>, |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>is_keep_alive_timed_out: bool, |
| } |
| |
| <span class="kw">struct </span>Bdp { |
| <span class="doccomment">/// Current BDP in bytes |
| </span>bdp: u32, |
| <span class="doccomment">/// Largest bandwidth we've seen so far. |
| </span>max_bandwidth: f64, |
| <span class="doccomment">/// Round trip time in seconds |
| </span>rtt: f64, |
| <span class="doccomment">/// Delay the next ping by this amount. |
| /// |
| /// This will change depending on how stable the current bandwidth is. |
| </span>ping_delay: Duration, |
| <span class="doccomment">/// The count of ping round trips where BDP has stayed the same. |
| </span>stable_count: u32, |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">struct </span>KeepAlive { |
| <span class="doccomment">/// If no frames are received in this amount of time, a PING frame is sent. |
| </span>interval: Duration, |
| <span class="doccomment">/// After sending a keepalive PING, the connection will be closed if |
| /// a pong is not received in this amount of time. |
| </span>timeout: Duration, |
| <span class="doccomment">/// If true, sends pings even when there are no active streams. |
| </span>while_idle: bool, |
| |
| state: KeepAliveState, |
| timer: Pin<Box<Sleep>>, |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">enum </span>KeepAliveState { |
| Init, |
| Scheduled, |
| PingSent, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Ponged { |
| SizeUpdate(WindowSize), |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>KeepAliveTimedOut, |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| #[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>KeepAliveTimedOut; |
| |
| <span class="comment">// ===== impl Config ===== |
| |
| </span><span class="kw">impl </span>Config { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_enabled(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="self">self</span>.bdp_initial_window.is_some() || <span class="self">self</span>.keep_alive_interval.is_some() |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"runtime"</span>))] |
| </span>{ |
| <span class="self">self</span>.bdp_initial_window.is_some() |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl Recorder ===== |
| |
| </span><span class="kw">impl </span>Recorder { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>record_data(<span class="kw-2">&</span><span class="self">self</span>, len: usize) { |
| <span class="kw">let </span>shared = <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>shared) = <span class="self">self</span>.shared { |
| shared |
| } <span class="kw">else </span>{ |
| <span class="kw">return</span>; |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>locked = shared.lock().unwrap(); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>locked.update_last_read_at(); |
| |
| <span class="comment">// are we ready to send another bdp ping? |
| // if not, we don't need to record bytes either |
| |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>next_bdp_at) = locked.next_bdp_at { |
| <span class="kw">if </span>Instant::now() < <span class="kw-2">*</span>next_bdp_at { |
| <span class="kw">return</span>; |
| } <span class="kw">else </span>{ |
| locked.next_bdp_at = <span class="prelude-val">None</span>; |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>bytes) = locked.bytes { |
| <span class="kw-2">*</span>bytes += len; |
| } <span class="kw">else </span>{ |
| <span class="comment">// no need to send bdp ping if bdp is disabled |
| </span><span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>!locked.is_ping_sent() { |
| locked.send_ping(); |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>record_non_data(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="kw">let </span>shared = <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>shared) = <span class="self">self</span>.shared { |
| shared |
| } <span class="kw">else </span>{ |
| <span class="kw">return</span>; |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>locked = shared.lock().unwrap(); |
| |
| locked.update_last_read_at(); |
| } |
| } |
| |
| <span class="doccomment">/// If the incoming stream is already closed, convert self into |
| /// a disabled reporter. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"client"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>for_stream(<span class="self">self</span>, stream: <span class="kw-2">&</span>h2::RecvStream) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>stream.is_end_stream() { |
| disabled() |
| } <span class="kw">else </span>{ |
| <span class="self">self |
| </span>} |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>ensure_not_timed_out(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw">crate</span>::Result<()> { |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>shared) = <span class="self">self</span>.shared { |
| <span class="kw">let </span>locked = shared.lock().unwrap(); |
| <span class="kw">if </span>locked.is_keep_alive_timed_out { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(KeepAliveTimedOut.crate_error()); |
| } |
| } |
| } |
| |
| <span class="comment">// else |
| </span><span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="comment">// ===== impl Ponger ===== |
| |
| </span><span class="kw">impl </span>Ponger { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>poll(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>) -> Poll<Ponged> { |
| <span class="kw">let </span>now = Instant::now(); |
| <span class="kw">let </span><span class="kw-2">mut </span>locked = <span class="self">self</span>.shared.lock().unwrap(); |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">let </span>is_idle = <span class="self">self</span>.is_idle(); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>ka) = <span class="self">self</span>.keep_alive { |
| ka.schedule(is_idle, <span class="kw-2">&</span>locked); |
| ka.maybe_ping(cx, <span class="kw-2">&mut </span>locked); |
| } |
| } |
| |
| <span class="kw">if </span>!locked.is_ping_sent() { |
| <span class="comment">// XXX: this doesn't register a waker...? |
| </span><span class="kw">return </span>Poll::Pending; |
| } |
| |
| <span class="kw">match </span>locked.ping_pong.poll_pong(cx) { |
| Poll::Ready(<span class="prelude-val">Ok</span>(_pong)) => { |
| <span class="kw">let </span>start = locked |
| .ping_sent_at |
| .expect(<span class="string">"pong received implies ping_sent_at"</span>); |
| locked.ping_sent_at = <span class="prelude-val">None</span>; |
| <span class="kw">let </span>rtt = now - start; |
| <span class="macro">trace!</span>(<span class="string">"recv pong"</span>); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>ka) = <span class="self">self</span>.keep_alive { |
| locked.update_last_read_at(); |
| ka.schedule(is_idle, <span class="kw-2">&</span>locked); |
| } |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>bdp) = <span class="self">self</span>.bdp { |
| <span class="kw">let </span>bytes = locked.bytes.expect(<span class="string">"bdp enabled implies bytes"</span>); |
| locked.bytes = <span class="prelude-val">Some</span>(<span class="number">0</span>); <span class="comment">// reset |
| </span><span class="macro">trace!</span>(<span class="string">"received BDP ack; bytes = {}, rtt = {:?}"</span>, bytes, rtt); |
| |
| <span class="kw">let </span>update = bdp.calculate(bytes, rtt); |
| locked.next_bdp_at = <span class="prelude-val">Some</span>(now + bdp.ping_delay); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(update) = update { |
| <span class="kw">return </span>Poll::Ready(Ponged::SizeUpdate(update)) |
| } |
| } |
| } |
| Poll::Ready(<span class="prelude-val">Err</span>(e)) => { |
| <span class="macro">debug!</span>(<span class="string">"pong error: {}"</span>, e); |
| } |
| Poll::Pending => { |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>ka) = <span class="self">self</span>.keep_alive { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(KeepAliveTimedOut) = ka.maybe_timeout(cx) { |
| <span class="self">self</span>.keep_alive = <span class="prelude-val">None</span>; |
| locked.is_keep_alive_timed_out = <span class="bool-val">true</span>; |
| <span class="kw">return </span>Poll::Ready(Ponged::KeepAliveTimedOut); |
| } |
| } |
| } |
| } |
| } |
| |
| <span class="comment">// XXX: this doesn't register a waker...? |
| </span>Poll::Pending |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">fn </span>is_idle(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| Arc::strong_count(<span class="kw-2">&</span><span class="self">self</span>.shared) <= <span class="number">2 |
| </span>} |
| } |
| |
| <span class="comment">// ===== impl Shared ===== |
| |
| </span><span class="kw">impl </span>Shared { |
| <span class="kw">fn </span>send_ping(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">match </span><span class="self">self</span>.ping_pong.send_ping(Ping::opaque()) { |
| <span class="prelude-val">Ok</span>(()) => { |
| <span class="self">self</span>.ping_sent_at = <span class="prelude-val">Some</span>(Instant::now()); |
| <span class="macro">trace!</span>(<span class="string">"sent ping"</span>); |
| } |
| <span class="prelude-val">Err</span>(err) => { |
| <span class="macro">debug!</span>(<span class="string">"error sending ping: {}"</span>, err); |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>is_ping_sent(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.ping_sent_at.is_some() |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">fn </span>update_last_read_at(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span><span class="self">self</span>.last_read_at.is_some() { |
| <span class="self">self</span>.last_read_at = <span class="prelude-val">Some</span>(Instant::now()); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">fn </span>last_read_at(<span class="kw-2">&</span><span class="self">self</span>) -> Instant { |
| <span class="self">self</span>.last_read_at.expect(<span class="string">"keep_alive expects last_read_at"</span>) |
| } |
| } |
| |
| <span class="comment">// ===== impl Bdp ===== |
| |
| </span><span class="doccomment">/// Any higher than this likely will be hitting the TCP flow control. |
| </span><span class="kw">const </span>BDP_LIMIT: usize = <span class="number">1024 </span>* <span class="number">1024 </span>* <span class="number">16</span>; |
| |
| <span class="kw">impl </span>Bdp { |
| <span class="kw">fn </span>calculate(<span class="kw-2">&mut </span><span class="self">self</span>, bytes: usize, rtt: Duration) -> <span class="prelude-ty">Option</span><WindowSize> { |
| <span class="comment">// No need to do any math if we're at the limit. |
| </span><span class="kw">if </span><span class="self">self</span>.bdp <span class="kw">as </span>usize == BDP_LIMIT { |
| <span class="self">self</span>.stabilize_delay(); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="comment">// average the rtt |
| </span><span class="kw">let </span>rtt = seconds(rtt); |
| <span class="kw">if </span><span class="self">self</span>.rtt == <span class="number">0.0 </span>{ |
| <span class="comment">// First sample means rtt is first rtt. |
| </span><span class="self">self</span>.rtt = rtt; |
| } <span class="kw">else </span>{ |
| <span class="comment">// Weigh this rtt as 1/8 for a moving average. |
| </span><span class="self">self</span>.rtt += (rtt - <span class="self">self</span>.rtt) * <span class="number">0.125</span>; |
| } |
| |
| <span class="comment">// calculate the current bandwidth |
| </span><span class="kw">let </span>bw = (bytes <span class="kw">as </span>f64) / (<span class="self">self</span>.rtt * <span class="number">1.5</span>); |
| <span class="macro">trace!</span>(<span class="string">"current bandwidth = {:.1}B/s"</span>, bw); |
| |
| <span class="kw">if </span>bw < <span class="self">self</span>.max_bandwidth { |
| <span class="comment">// not a faster bandwidth, so don't update |
| </span><span class="self">self</span>.stabilize_delay(); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.max_bandwidth = bw; |
| } |
| |
| <span class="comment">// if the current `bytes` sample is at least 2/3 the previous |
| // bdp, increase to double the current sample. |
| </span><span class="kw">if </span>bytes >= <span class="self">self</span>.bdp <span class="kw">as </span>usize * <span class="number">2 </span>/ <span class="number">3 </span>{ |
| <span class="self">self</span>.bdp = (bytes * <span class="number">2</span>).min(BDP_LIMIT) <span class="kw">as </span>WindowSize; |
| <span class="macro">trace!</span>(<span class="string">"BDP increased to {}"</span>, <span class="self">self</span>.bdp); |
| |
| <span class="self">self</span>.stable_count = <span class="number">0</span>; |
| <span class="self">self</span>.ping_delay /= <span class="number">2</span>; |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.bdp) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.stabilize_delay(); |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">fn </span>stabilize_delay(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span><span class="self">self</span>.ping_delay < Duration::from_secs(<span class="number">10</span>) { |
| <span class="self">self</span>.stable_count += <span class="number">1</span>; |
| |
| <span class="kw">if </span><span class="self">self</span>.stable_count >= <span class="number">2 </span>{ |
| <span class="self">self</span>.ping_delay <span class="kw-2">*</span>= <span class="number">4</span>; |
| <span class="self">self</span>.stable_count = <span class="number">0</span>; |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>seconds(dur: Duration) -> f64 { |
| <span class="kw">const </span>NANOS_PER_SEC: f64 = <span class="number">1_000_000_000.0</span>; |
| <span class="kw">let </span>secs = dur.as_secs() <span class="kw">as </span>f64; |
| secs + (dur.subsec_nanos() <span class="kw">as </span>f64) / NANOS_PER_SEC |
| } |
| |
| <span class="comment">// ===== impl KeepAlive ===== |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">impl </span>KeepAlive { |
| <span class="kw">fn </span>schedule(<span class="kw-2">&mut </span><span class="self">self</span>, is_idle: bool, shared: <span class="kw-2">&</span>Shared) { |
| <span class="kw">match </span><span class="self">self</span>.state { |
| KeepAliveState::Init => { |
| <span class="kw">if </span>!<span class="self">self</span>.while_idle && is_idle { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="self">self</span>.state = KeepAliveState::Scheduled; |
| <span class="kw">let </span>interval = shared.last_read_at() + <span class="self">self</span>.interval; |
| <span class="self">self</span>.timer.as_mut().reset(interval); |
| } |
| KeepAliveState::PingSent => { |
| <span class="kw">if </span>shared.is_ping_sent() { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="self">self</span>.state = KeepAliveState::Scheduled; |
| <span class="kw">let </span>interval = shared.last_read_at() + <span class="self">self</span>.interval; |
| <span class="self">self</span>.timer.as_mut().reset(interval); |
| } |
| KeepAliveState::Scheduled => (), |
| } |
| } |
| |
| <span class="kw">fn </span>maybe_ping(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, shared: <span class="kw-2">&mut </span>Shared) { |
| <span class="kw">match </span><span class="self">self</span>.state { |
| KeepAliveState::Scheduled => { |
| <span class="kw">if </span>Pin::new(<span class="kw-2">&mut </span><span class="self">self</span>.timer).poll(cx).is_pending() { |
| <span class="kw">return</span>; |
| } |
| <span class="comment">// check if we've received a frame while we were scheduled |
| </span><span class="kw">if </span>shared.last_read_at() + <span class="self">self</span>.interval > <span class="self">self</span>.timer.deadline() { |
| <span class="self">self</span>.state = KeepAliveState::Init; |
| cx.waker().wake_by_ref(); <span class="comment">// schedule us again |
| </span><span class="kw">return</span>; |
| } |
| <span class="macro">trace!</span>(<span class="string">"keep-alive interval ({:?}) reached"</span>, <span class="self">self</span>.interval); |
| shared.send_ping(); |
| <span class="self">self</span>.state = KeepAliveState::PingSent; |
| <span class="kw">let </span>timeout = Instant::now() + <span class="self">self</span>.timeout; |
| <span class="self">self</span>.timer.as_mut().reset(timeout); |
| } |
| KeepAliveState::Init | KeepAliveState::PingSent => (), |
| } |
| } |
| |
| <span class="kw">fn </span>maybe_timeout(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>) -> <span class="prelude-ty">Result</span><(), KeepAliveTimedOut> { |
| <span class="kw">match </span><span class="self">self</span>.state { |
| KeepAliveState::PingSent => { |
| <span class="kw">if </span>Pin::new(<span class="kw-2">&mut </span><span class="self">self</span>.timer).poll(cx).is_pending() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| <span class="macro">trace!</span>(<span class="string">"keep-alive timeout ({:?}) reached"</span>, <span class="self">self</span>.timeout); |
| <span class="prelude-val">Err</span>(KeepAliveTimedOut) |
| } |
| KeepAliveState::Init | KeepAliveState::Scheduled => <span class="prelude-val">Ok</span>(()), |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl KeepAliveTimedOut ===== |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">impl </span>KeepAliveTimedOut { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>crate_error(<span class="self">self</span>) -> <span class="kw">crate</span>::Error { |
| <span class="kw">crate</span>::Error::new(<span class="kw">crate</span>::error::Kind::Http2).with(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">impl </span>fmt::Display <span class="kw">for </span>KeepAliveTimedOut { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.write_str(<span class="string">"keep-alive timed out"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"runtime"</span>)] |
| </span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>KeepAliveTimedOut { |
| <span class="kw">fn </span>source(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>(<span class="kw">dyn </span>std::error::Error + <span class="lifetime">'static</span>)> { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw">crate</span>::error::TimedOut) |
| } |
| } |
| </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> |
