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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{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="attr">#[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="attr">#[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) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span>remaining = <span class="kw">if </span>count &gt;= 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="attr">#[must_use]
    </span><span class="kw">pub fn </span>limit(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
        <span class="self">self</span>.limit
    }

    <span class="doccomment">/// Returns how many requests are left in the current period.
    </span><span class="attr">#[must_use]
    </span><span class="kw">pub fn </span>remaining(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; 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="attr">#[must_use]
    </span><span class="kw">pub fn </span>reset_epoch_utc(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; 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) -&gt; <span class="prelude-ty">Result</span>&lt;usize, LimitationError&gt; {
        <span class="kw">match </span>chrono::Duration::from_std(duration) {
            <span class="prelude-val">Ok</span>(value) =&gt; <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>) =&gt; <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="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use super</span>::<span class="kw-2">*</span>;

    <span class="attr">#[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="attr">#[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="attr">#[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="attr">#[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 &gt;= duration.as_secs());
    }

    <span class="attr">#[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 &gt;= duration.as_secs() + <span class="number">10</span>);
    }

    <span class="attr">#[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></section></main></body></html>