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</pre><pre class="rust"><code><span class="kw">use </span>std::{convert::TryInto, ops::Add, time::Duration};
<span class="kw">use </span>chrono::SubsecRound <span class="kw">as _</span>;
<span class="kw">use </span><span class="kw">crate</span>::Error <span class="kw">as </span>LimitationError;
<span class="doccomment">/// A report for a given key containing the limit status.
</span><span class="attribute">#[derive(Debug, Clone)]
</span><span class="kw">pub struct </span>Status {
<span class="kw">pub</span>(<span class="kw">crate</span>) limit: usize,
<span class="kw">pub</span>(<span class="kw">crate</span>) remaining: usize,
<span class="kw">pub</span>(<span class="kw">crate</span>) reset_epoch_utc: usize,
}
<span class="kw">impl </span>Status {
<span class="doccomment">/// Constructs status limit status from parts.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(count: usize, limit: usize, reset_epoch_utc: usize) -> <span class="self">Self </span>{
<span class="kw">let </span>remaining = <span class="kw">if </span>count >= limit { <span class="number">0 </span>} <span class="kw">else </span>{ limit - count };
Status {
limit,
remaining,
reset_epoch_utc,
}
}
<span class="doccomment">/// Returns the maximum number of requests allowed in the current period.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>limit(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<span class="self">self</span>.limit
}
<span class="doccomment">/// Returns how many requests are left in the current period.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>remaining(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<span class="self">self</span>.remaining
}
<span class="doccomment">/// Returns a UNIX timestamp in UTC approximately when the next period will begin.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>reset_epoch_utc(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<span class="self">self</span>.reset_epoch_utc
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>epoch_utc_plus(duration: Duration) -> <span class="prelude-ty">Result</span><usize, LimitationError> {
<span class="kw">match </span>chrono::Duration::from_std(duration) {
<span class="prelude-val">Ok</span>(value) => <span class="prelude-val">Ok</span>(chrono::Utc::now()
.add(value)
.round_subsecs(<span class="number">0</span>)
.timestamp()
.try_into()
.unwrap_or(<span class="number">0</span>)),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(LimitationError::Other(
<span class="string">"Source duration value is out of range for the target type"</span>.to_string(),
)),
}
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_create_status() {
<span class="kw">let </span>status = Status {
limit: <span class="number">100</span>,
remaining: <span class="number">0</span>,
reset_epoch_utc: <span class="number">1000</span>,
};
<span class="macro">assert_eq!</span>(status.limit(), <span class="number">100</span>);
<span class="macro">assert_eq!</span>(status.remaining(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(status.reset_epoch_utc(), <span class="number">1000</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_build_status() {
<span class="kw">let </span>count = <span class="number">200</span>;
<span class="kw">let </span>limit = <span class="number">100</span>;
<span class="kw">let </span>status = Status::new(count, limit, <span class="number">2000</span>);
<span class="macro">assert_eq!</span>(status.limit(), limit);
<span class="macro">assert_eq!</span>(status.remaining(), <span class="number">0</span>);
<span class="macro">assert_eq!</span>(status.reset_epoch_utc(), <span class="number">2000</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_build_status_limit() {
<span class="kw">let </span>limit = <span class="number">100</span>;
<span class="kw">let </span>status = Status::new(<span class="number">0</span>, limit, <span class="number">2000</span>);
<span class="macro">assert_eq!</span>(status.limit(), limit);
<span class="macro">assert_eq!</span>(status.remaining(), limit);
<span class="macro">assert_eq!</span>(status.reset_epoch_utc(), <span class="number">2000</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_epoch_utc_plus_zero() {
<span class="kw">let </span>duration = Duration::from_secs(<span class="number">0</span>);
<span class="kw">let </span>seconds = Status::epoch_utc_plus(duration).unwrap();
<span class="macro">assert!</span>(seconds <span class="kw">as </span>u64 >= duration.as_secs());
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_epoch_utc_plus() {
<span class="kw">let </span>duration = Duration::from_secs(<span class="number">10</span>);
<span class="kw">let </span>seconds = Status::epoch_utc_plus(duration).unwrap();
<span class="macro">assert!</span>(seconds <span class="kw">as </span>u64 >= duration.as_secs() + <span class="number">10</span>);
}
<span class="attribute">#[test]
#[should_panic = <span class="string">"Source duration value is out of range for the target type"</span>]
</span><span class="kw">fn </span>test_epoch_utc_plus_overflow() {
<span class="kw">let </span>duration = Duration::from_secs(<span class="number">10000000000000000000</span>);
Status::epoch_utc_plus(duration).unwrap();
}
}
</code></pre></div>
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