| <!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/h2-0.3.19/src/proto/streams/flow_control.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>flow_control.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="../../../../h2/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="../../../../h2/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="kw">use </span><span class="kw">crate</span>::frame::Reason; |
| <span class="kw">use </span><span class="kw">crate</span>::proto::{WindowSize, MAX_WINDOW_SIZE}; |
| |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="comment">// We don't want to send WINDOW_UPDATE frames for tiny changes, but instead |
| // aggregate them when the changes are significant. Many implementations do |
| // this by keeping a "ratio" of the update version the allowed window size. |
| // |
| // While some may wish to represent this ratio as percentage, using a f32, |
| // we skip having to deal with float math and stick to integers. To do so, |
| // the "ratio" is represented by 2 i32s, split into the numerator and |
| // denominator. For example, a 50% ratio is simply represented as 1/2. |
| // |
| // An example applying this ratio: If a stream has an allowed window size of |
| // 100 bytes, WINDOW_UPDATE frames are scheduled when the unclaimed change |
| // becomes greater than 1/2, or 50 bytes. |
| </span><span class="kw">const </span>UNCLAIMED_NUMERATOR: i32 = <span class="number">1</span>; |
| <span class="kw">const </span>UNCLAIMED_DENOMINATOR: i32 = <span class="number">2</span>; |
| |
| <span class="attribute">#[test] |
| #[allow(clippy::assertions_on_constants)] |
| </span><span class="kw">fn </span>sanity_unclaimed_ratio() { |
| <span class="macro">assert!</span>(UNCLAIMED_NUMERATOR < UNCLAIMED_DENOMINATOR); |
| <span class="macro">assert!</span>(UNCLAIMED_NUMERATOR >= <span class="number">0</span>); |
| <span class="macro">assert!</span>(UNCLAIMED_DENOMINATOR > <span class="number">0</span>); |
| } |
| |
| <span class="attribute">#[derive(Copy, Clone, Debug)] |
| </span><span class="kw">pub struct </span>FlowControl { |
| <span class="doccomment">/// Window the peer knows about. |
| /// |
| /// This can go negative if a SETTINGS_INITIAL_WINDOW_SIZE is received. |
| /// |
| /// For example, say the peer sends a request and uses 32kb of the window. |
| /// We send a SETTINGS_INITIAL_WINDOW_SIZE of 16kb. The peer has to adjust |
| /// its understanding of the capacity of the window, and that would be: |
| /// |
| /// ```notrust |
| /// default (64kb) - used (32kb) - settings_diff (64kb - 16kb): -16kb |
| /// ``` |
| </span>window_size: Window, |
| |
| <span class="doccomment">/// Window that we know about. |
| /// |
| /// This can go negative if a user declares a smaller target window than |
| /// the peer knows about. |
| </span>available: Window, |
| } |
| |
| <span class="kw">impl </span>FlowControl { |
| <span class="kw">pub fn </span>new() -> FlowControl { |
| FlowControl { |
| window_size: Window(<span class="number">0</span>), |
| available: Window(<span class="number">0</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the window size as known by the peer |
| </span><span class="kw">pub fn </span>window_size(<span class="kw-2">&</span><span class="self">self</span>) -> WindowSize { |
| <span class="self">self</span>.window_size.as_size() |
| } |
| |
| <span class="doccomment">/// Returns the window size available to the consumer |
| </span><span class="kw">pub fn </span>available(<span class="kw-2">&</span><span class="self">self</span>) -> Window { |
| <span class="self">self</span>.available |
| } |
| |
| <span class="doccomment">/// Returns true if there is unavailable window capacity |
| </span><span class="kw">pub fn </span>has_unavailable(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.window_size < <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| <span class="self">self</span>.window_size > <span class="self">self</span>.available |
| } |
| |
| <span class="kw">pub fn </span>claim_capacity(<span class="kw-2">&mut </span><span class="self">self</span>, capacity: WindowSize) { |
| <span class="self">self</span>.available -= capacity; |
| } |
| |
| <span class="kw">pub fn </span>assign_capacity(<span class="kw-2">&mut </span><span class="self">self</span>, capacity: WindowSize) { |
| <span class="self">self</span>.available += capacity; |
| } |
| |
| <span class="doccomment">/// If a WINDOW_UPDATE frame should be sent, returns a positive number |
| /// representing the increment to be used. |
| /// |
| /// If there is no available bytes to be reclaimed, or the number of |
| /// available bytes does not reach the threshold, this returns `None`. |
| /// |
| /// This represents pending outbound WINDOW_UPDATE frames. |
| </span><span class="kw">pub fn </span>unclaimed_capacity(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><WindowSize> { |
| <span class="kw">let </span>available = <span class="self">self</span>.available; |
| |
| <span class="kw">if </span><span class="self">self</span>.window_size >= available { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="kw">let </span>unclaimed = available.<span class="number">0 </span>- <span class="self">self</span>.window_size.<span class="number">0</span>; |
| <span class="kw">let </span>threshold = <span class="self">self</span>.window_size.<span class="number">0 </span>/ UNCLAIMED_DENOMINATOR * UNCLAIMED_NUMERATOR; |
| |
| <span class="kw">if </span>unclaimed < threshold { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(unclaimed <span class="kw">as </span>WindowSize) |
| } |
| } |
| |
| <span class="doccomment">/// Increase the window size. |
| /// |
| /// This is called after receiving a WINDOW_UPDATE frame |
| </span><span class="kw">pub fn </span>inc_window(<span class="kw-2">&mut </span><span class="self">self</span>, sz: WindowSize) -> <span class="prelude-ty">Result</span><(), Reason> { |
| <span class="kw">let </span>(val, overflow) = <span class="self">self</span>.window_size.<span class="number">0</span>.overflowing_add(sz <span class="kw">as </span>i32); |
| |
| <span class="kw">if </span>overflow { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reason::FLOW_CONTROL_ERROR); |
| } |
| |
| <span class="kw">if </span>val > MAX_WINDOW_SIZE <span class="kw">as </span>i32 { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Reason::FLOW_CONTROL_ERROR); |
| } |
| |
| <span class="macro">tracing::trace!</span>( |
| <span class="string">"inc_window; sz={}; old={}; new={}"</span>, |
| sz, |
| <span class="self">self</span>.window_size, |
| val |
| ); |
| |
| <span class="self">self</span>.window_size = Window(val); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Decrement the send-side window size. |
| /// |
| /// This is called after receiving a SETTINGS frame with a lower |
| /// INITIAL_WINDOW_SIZE value. |
| </span><span class="kw">pub fn </span>dec_send_window(<span class="kw-2">&mut </span><span class="self">self</span>, sz: WindowSize) { |
| <span class="macro">tracing::trace!</span>( |
| <span class="string">"dec_window; sz={}; window={}, available={}"</span>, |
| sz, |
| <span class="self">self</span>.window_size, |
| <span class="self">self</span>.available |
| ); |
| <span class="comment">// This should not be able to overflow `window_size` from the bottom. |
| </span><span class="self">self</span>.window_size -= sz; |
| } |
| |
| <span class="doccomment">/// Decrement the recv-side window size. |
| /// |
| /// This is called after receiving a SETTINGS ACK frame with a lower |
| /// INITIAL_WINDOW_SIZE value. |
| </span><span class="kw">pub fn </span>dec_recv_window(<span class="kw-2">&mut </span><span class="self">self</span>, sz: WindowSize) { |
| <span class="macro">tracing::trace!</span>( |
| <span class="string">"dec_recv_window; sz={}; window={}, available={}"</span>, |
| sz, |
| <span class="self">self</span>.window_size, |
| <span class="self">self</span>.available |
| ); |
| <span class="comment">// This should not be able to overflow `window_size` from the bottom. |
| </span><span class="self">self</span>.window_size -= sz; |
| <span class="self">self</span>.available -= sz; |
| } |
| |
| <span class="doccomment">/// Decrements the window reflecting data has actually been sent. The caller |
| /// must ensure that the window has capacity. |
| </span><span class="kw">pub fn </span>send_data(<span class="kw-2">&mut </span><span class="self">self</span>, sz: WindowSize) { |
| <span class="macro">tracing::trace!</span>( |
| <span class="string">"send_data; sz={}; window={}; available={}"</span>, |
| sz, |
| <span class="self">self</span>.window_size, |
| <span class="self">self</span>.available |
| ); |
| |
| <span class="comment">// If send size is zero it's meaningless to update flow control window |
| </span><span class="kw">if </span>sz > <span class="number">0 </span>{ |
| <span class="comment">// Ensure that the argument is correct |
| </span><span class="macro">assert!</span>(<span class="self">self</span>.window_size >= sz <span class="kw">as </span>usize); |
| |
| <span class="comment">// Update values |
| </span><span class="self">self</span>.window_size -= sz; |
| <span class="self">self</span>.available -= sz; |
| } |
| } |
| } |
| |
| <span class="doccomment">/// The current capacity of a flow-controlled Window. |
| /// |
| /// This number can go negative when either side has used a certain amount |
| /// of capacity when the other side advertises a reduction in size. |
| /// |
| /// This type tries to centralize the knowledge of addition and subtraction |
| /// to this capacity, instead of having integer casts throughout the source. |
| </span><span class="attribute">#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd)] |
| </span><span class="kw">pub struct </span>Window(i32); |
| |
| <span class="kw">impl </span>Window { |
| <span class="kw">pub fn </span>as_size(<span class="kw-2">&</span><span class="self">self</span>) -> WindowSize { |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">0 </span>< <span class="number">0 </span>{ |
| <span class="number">0 |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>WindowSize |
| } |
| } |
| |
| <span class="kw">pub fn </span>checked_size(<span class="kw-2">&</span><span class="self">self</span>) -> WindowSize { |
| <span class="macro">assert!</span>(<span class="self">self</span>.<span class="number">0 </span>>= <span class="number">0</span>, <span class="string">"negative Window"</span>); |
| <span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>WindowSize |
| } |
| } |
| |
| <span class="kw">impl </span>PartialEq<usize> <span class="kw">for </span>Window { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>usize) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">0 </span>< <span class="number">0 </span>{ |
| <span class="bool-val">false |
| </span>} <span class="kw">else </span>{ |
| (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize).eq(other) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>PartialOrd<usize> <span class="kw">for </span>Window { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>usize) -> <span class="prelude-ty">Option</span><::std::cmp::Ordering> { |
| <span class="kw">if </span><span class="self">self</span>.<span class="number">0 </span>< <span class="number">0 </span>{ |
| <span class="prelude-val">Some</span>(::std::cmp::Ordering::Less) |
| } <span class="kw">else </span>{ |
| (<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>usize).partial_cmp(other) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>::std::ops::SubAssign<WindowSize> <span class="kw">for </span>Window { |
| <span class="kw">fn </span>sub_assign(<span class="kw-2">&mut </span><span class="self">self</span>, other: WindowSize) { |
| <span class="self">self</span>.<span class="number">0 </span>-= other <span class="kw">as </span>i32; |
| } |
| } |
| |
| <span class="kw">impl </span>::std::ops::Add<WindowSize> <span class="kw">for </span>Window { |
| <span class="kw">type </span>Output = <span class="self">Self</span>; |
| <span class="kw">fn </span>add(<span class="self">self</span>, other: WindowSize) -> <span class="self">Self</span>::Output { |
| Window(<span class="self">self</span>.<span class="number">0 </span>+ other <span class="kw">as </span>i32) |
| } |
| } |
| |
| <span class="kw">impl </span>::std::ops::AddAssign<WindowSize> <span class="kw">for </span>Window { |
| <span class="kw">fn </span>add_assign(<span class="kw-2">&mut </span><span class="self">self</span>, other: WindowSize) { |
| <span class="self">self</span>.<span class="number">0 </span>+= other <span class="kw">as </span>i32; |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Window { |
| <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) -> fmt::Result { |
| fmt::Display::fmt(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>, f) |
| } |
| } |
| |
| <span class="kw">impl </span>From<Window> <span class="kw">for </span>isize { |
| <span class="kw">fn </span>from(w: Window) -> isize { |
| w.<span class="number">0 </span><span class="kw">as </span>isize |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="h2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
