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| </pre><pre class="rust "> |
| <span class="doccomment">//! Support for creating futures that represent intervals.</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! This module contains the `Interval` type which is a stream that will</span> |
| <span class="doccomment">//! resolve at a fixed intervals in future</span> |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>}; |
| |
| <span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Poll</span>, <span class="ident">Async</span>}; |
| <span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">stream</span>::{<span class="ident">Stream</span>}; |
| |
| <span class="kw">use</span> <span class="ident">reactor</span>::{<span class="ident">Remote</span>, <span class="ident">Handle</span>}; |
| <span class="kw">use</span> <span class="ident">reactor</span>::<span class="ident">timeout_token</span>::<span class="ident">TimeoutToken</span>; |
| |
| <span class="doccomment">/// A stream representing notifications at fixed interval</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Intervals are created through the `Interval::new` or</span> |
| <span class="doccomment">/// `Interval::new_at` methods indicating when a first notification</span> |
| <span class="doccomment">/// should be triggered and when it will be repeated.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Note that timeouts are not intended for high resolution timers, but rather</span> |
| <span class="doccomment">/// they will likely fire some granularity after the exact instant that they're</span> |
| <span class="doccomment">/// otherwise indicated to fire at.</span> |
| <span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"streams do nothing unless polled"</span>]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Interval</span> { |
| <span class="ident">token</span>: <span class="ident">TimeoutToken</span>, |
| <span class="ident">next</span>: <span class="ident">Instant</span>, |
| <span class="ident">interval</span>: <span class="ident">Duration</span>, |
| <span class="ident">handle</span>: <span class="ident">Remote</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Interval</span> { |
| <span class="doccomment">/// Creates a new interval which will fire at `dur` time into the future,</span> |
| <span class="doccomment">/// and will repeat every `dur` interval after</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function will return a future that will resolve to the actual</span> |
| <span class="doccomment">/// interval object. The interval object itself is then a stream which will</span> |
| <span class="doccomment">/// be set to fire at the specified intervals</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">dur</span>: <span class="ident">Duration</span>, <span class="ident">handle</span>: <span class="kw-2">&</span><span class="ident">Handle</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Interval</span><span class="op">></span> { |
| <span class="ident">Interval</span>::<span class="ident">new_at</span>(<span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">+</span> <span class="ident">dur</span>, <span class="ident">dur</span>, <span class="ident">handle</span>) |
| } |
| |
| <span class="doccomment">/// Creates a new interval which will fire at the time specified by `at`,</span> |
| <span class="doccomment">/// and then will repeat every `dur` interval after</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function will return a future that will resolve to the actual</span> |
| <span class="doccomment">/// timeout object. The timeout object itself is then a future which will be</span> |
| <span class="doccomment">/// set to fire at the specified point in the future.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_at</span>(<span class="ident">at</span>: <span class="ident">Instant</span>, <span class="ident">dur</span>: <span class="ident">Duration</span>, <span class="ident">handle</span>: <span class="kw-2">&</span><span class="ident">Handle</span>) |
| <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Interval</span><span class="op">></span> |
| { |
| <span class="prelude-val">Ok</span>(<span class="ident">Interval</span> { |
| <span class="ident">token</span>: <span class="macro">try</span><span class="macro">!</span>(<span class="ident">TimeoutToken</span>::<span class="ident">new</span>(<span class="ident">at</span>, <span class="kw-2">&</span><span class="ident">handle</span>)), |
| <span class="ident">next</span>: <span class="ident">at</span>, |
| <span class="ident">interval</span>: <span class="ident">dur</span>, |
| <span class="ident">handle</span>: <span class="ident">handle</span>.<span class="ident">remote</span>().<span class="ident">clone</span>(), |
| }) |
| } |
| |
| <span class="doccomment">/// Polls this `Interval` instance to see if it's elapsed, assuming the</span> |
| <span class="doccomment">/// current time is specified by `now`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The `Future::poll` implementation for `Interval` will call `Instant::now`</span> |
| <span class="doccomment">/// each time it's invoked, but in some contexts this can be a costly</span> |
| <span class="doccomment">/// operation. This method is provided to amortize the cost by avoiding</span> |
| <span class="doccomment">/// usage of `Instant::now`, assuming that it's been called elsewhere.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function takes the assumed current time as the first parameter and</span> |
| <span class="doccomment">/// otherwise functions as this future's `poll` function. This will block a</span> |
| <span class="doccomment">/// task if one isn't already blocked or update a previous one if already</span> |
| <span class="doccomment">/// blocked.</span> |
| <span class="kw">fn</span> <span class="ident">poll_at</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">now</span>: <span class="ident">Instant</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span>()<span class="op">></span>, <span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">next</span> <span class="op"><=</span> <span class="ident">now</span> { |
| <span class="self">self</span>.<span class="ident">next</span> <span class="op">=</span> <span class="ident">next_interval</span>(<span class="self">self</span>.<span class="ident">next</span>, <span class="ident">now</span>, <span class="self">self</span>.<span class="ident">interval</span>); |
| <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">reset_timeout</span>(<span class="self">self</span>.<span class="ident">next</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">handle</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">Some</span>(()))) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">update_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">handle</span>); |
| <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>) |
| } |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Stream</span> <span class="kw">for</span> <span class="ident">Interval</span> { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> (); |
| <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>; |
| |
| <span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span>()<span class="op">></span>, <span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="comment">// TODO: is this fast enough?</span> |
| <span class="self">self</span>.<span class="ident">poll_at</span>(<span class="ident">Instant</span>::<span class="ident">now</span>()) |
| } |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Interval</span> { |
| <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { |
| <span class="self">self</span>.<span class="ident">token</span>.<span class="ident">cancel_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">handle</span>); |
| } |
| } |
| |
| <span class="doccomment">/// Converts Duration object to raw nanoseconds if possible</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This is useful to divide intervals.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// While technically for large duration it's impossible to represent any</span> |
| <span class="doccomment">/// duration as nanoseconds, the largest duration we can represent is about</span> |
| <span class="doccomment">/// 427_000 years. Large enough for any interval we would use or calculate in</span> |
| <span class="doccomment">/// tokio.</span> |
| <span class="kw">fn</span> <span class="ident">duration_to_nanos</span>(<span class="ident">dur</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> { |
| <span class="ident">dur</span>.<span class="ident">as_secs</span>() |
| .<span class="ident">checked_mul</span>(<span class="number">1_000_000_000</span>) |
| .<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">v</span>.<span class="ident">checked_add</span>(<span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> <span class="ident">u64</span>)) |
| } |
| |
| <span class="kw">fn</span> <span class="ident">next_interval</span>(<span class="ident">prev</span>: <span class="ident">Instant</span>, <span class="ident">now</span>: <span class="ident">Instant</span>, <span class="ident">interval</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">Instant</span> { |
| <span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">prev</span> <span class="op">+</span> <span class="ident">interval</span>; |
| <span class="kw">if</span> <span class="ident">new</span> <span class="op">></span> <span class="ident">now</span> { |
| <span class="kw">return</span> <span class="ident">new</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">let</span> <span class="ident">spent_ns</span> <span class="op">=</span> <span class="ident">duration_to_nanos</span>(<span class="ident">now</span>.<span class="ident">duration_since</span>(<span class="ident">prev</span>)) |
| .<span class="ident">expect</span>(<span class="string">"interval should be expired"</span>); |
| <span class="kw">let</span> <span class="ident">interval_ns</span> <span class="op">=</span> <span class="ident">duration_to_nanos</span>(<span class="ident">interval</span>) |
| .<span class="ident">expect</span>(<span class="string">"interval is less that 427 thousand years"</span>); |
| <span class="kw">let</span> <span class="ident">mult</span> <span class="op">=</span> <span class="ident">spent_ns</span><span class="op">/</span><span class="ident">interval_ns</span> <span class="op">+</span> <span class="number">1</span>; |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">mult</span> <span class="op"><</span> (<span class="number">1</span> <span class="op"><<</span> <span class="number">32</span>), |
| <span class="string">"can't skip more than 4 billion intervals of {:?} \ |
| (trying to skip {})"</span>, <span class="ident">interval</span>, <span class="ident">mult</span>); |
| <span class="kw">return</span> <span class="ident">prev</span> <span class="op">+</span> <span class="ident">interval</span> <span class="op">*</span> (<span class="ident">mult</span> <span class="kw">as</span> <span class="ident">u32</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">test</span> { |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">Instant</span>, <span class="ident">Duration</span>}; |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">next_interval</span>; |
| |
| <span class="kw">struct</span> <span class="ident">Timeline</span>(<span class="ident">Instant</span>); |
| |
| <span class="kw">impl</span> <span class="ident">Timeline</span> { |
| <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">Timeline</span> { |
| <span class="ident">Timeline</span>(<span class="ident">Instant</span>::<span class="ident">now</span>()) |
| } |
| <span class="kw">fn</span> <span class="ident">at</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">millis</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Instant</span> { |
| <span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">millis</span>) |
| } |
| <span class="kw">fn</span> <span class="ident">at_ns</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">sec</span>: <span class="ident">u64</span>, <span class="ident">nanos</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">Instant</span> { |
| <span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">new</span>(<span class="ident">sec</span>, <span class="ident">nanos</span>) |
| } |
| } |
| |
| <span class="kw">fn</span> <span class="ident">dur</span>(<span class="ident">millis</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Duration</span> { |
| <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">millis</span>) |
| } |
| |
| <span class="comment">// The math around Instant/Duration isn't 100% precise due to rounding</span> |
| <span class="comment">// errors, see #249 for more info</span> |
| <span class="kw">fn</span> <span class="ident">almost_eq</span>(<span class="ident">a</span>: <span class="ident">Instant</span>, <span class="ident">b</span>: <span class="ident">Instant</span>) <span class="op">-></span> <span class="ident">bool</span> { |
| <span class="kw">if</span> <span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span> { |
| <span class="bool-val">true</span> |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">a</span> <span class="op">></span> <span class="ident">b</span> { |
| <span class="ident">a</span> <span class="op">-</span> <span class="ident">b</span> <span class="op"><</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>) |
| } <span class="kw">else</span> { |
| <span class="ident">b</span> <span class="op">-</span> <span class="ident">a</span> <span class="op"><</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">norm_next</span>() { |
| <span class="kw">let</span> <span class="ident">tm</span> <span class="op">=</span> <span class="ident">Timeline</span>::<span class="ident">new</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">2</span>), <span class="ident">dur</span>(<span class="number">10</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">11</span>))); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">7777</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">7788</span>), <span class="ident">dur</span>(<span class="number">100</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">7877</span>))); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1000</span>), <span class="ident">dur</span>(<span class="number">2100</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">2101</span>))); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">fast_forward</span>() { |
| <span class="kw">let</span> <span class="ident">tm</span> <span class="op">=</span> <span class="ident">Timeline</span>::<span class="ident">new</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1000</span>), <span class="ident">dur</span>(<span class="number">10</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1001</span>))); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">7777</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">8888</span>), <span class="ident">dur</span>(<span class="number">100</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">8977</span>))); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">almost_eq</span>(<span class="ident">next_interval</span>(<span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">1</span>), <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">10000</span>), <span class="ident">dur</span>(<span class="number">2100</span>)), |
| <span class="ident">tm</span>.<span class="ident">at</span>(<span class="number">10501</span>))); |
| } |
| |
| <span class="doccomment">/// TODO: this test actually should be successful, but since we can't</span> |
| <span class="doccomment">/// multiply Duration on anything larger than u32 easily we decided</span> |
| <span class="doccomment">/// to allow it to fail for now</span> |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>(<span class="ident">expected</span> <span class="op">=</span> <span class="string">"can't skip more than 4 billion intervals"</span>)]</span> |
| <span class="kw">fn</span> <span class="ident">large_skip</span>() { |
| <span class="kw">let</span> <span class="ident">tm</span> <span class="op">=</span> <span class="ident">Timeline</span>::<span class="ident">new</span>(); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">next_interval</span>( |
| <span class="ident">tm</span>.<span class="ident">at_ns</span>(<span class="number">0</span>, <span class="number">1</span>), <span class="ident">tm</span>.<span class="ident">at_ns</span>(<span class="number">25</span>, <span class="number">0</span>), <span class="ident">Duration</span>::<span class="ident">new</span>(<span class="number">0</span>, <span class="number">2</span>)), |
| <span class="ident">tm</span>.<span class="ident">at_ns</span>(<span class="number">25</span>, <span class="number">1</span>)); |
| } |
| |
| } |
| </pre> |
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