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</pre><pre class="rust"><code><span class="kw">use </span>std::fmt;
<span class="kw">use </span>serde::de;
<span class="kw">use crate</span>::{AsResult, Error, Parse};
<span class="doccomment">/// The maximum per-worker number of concurrent connections.
///
/// All socket listeners will stop accepting connections when this limit is reached for each worker.
/// By default max connections is set to a 25k. Takes a string value: Either "default", or an
/// integer N > 0 e.g. "6".
</span><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
</span><span class="kw">pub enum </span>MaxConnections {
<span class="doccomment">/// The default number of connections. See struct docs.
</span>Default,
<span class="doccomment">/// A specific number of connections.
</span>Manual(usize),
}
<span class="kw">impl </span>Parse <span class="kw">for </span>MaxConnections {
<span class="kw">fn </span>parse(string: <span class="kw-2">&</span>str) -> AsResult<<span class="self">Self</span>> {
<span class="kw">match </span>string {
<span class="string">"default" </span>=> <span class="prelude-val">Ok</span>(MaxConnections::Default),
string => <span class="kw">match </span>string.parse::<usize>() {
<span class="prelude-val">Ok</span>(val) => <span class="prelude-val">Ok</span>(MaxConnections::Manual(val)),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="macro">InvalidValue! </span>{
expected: <span class="string">"an integer > 0"</span>,
got: string,
}),
},
}
}
}
<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span>MaxConnections {
<span class="kw">fn </span>deserialize<D>(deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, D::Error>
<span class="kw">where
</span>D: de::Deserializer<<span class="lifetime">'de</span>>,
{
<span class="kw">struct </span>MaxConnectionsVisitor;
<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Visitor<<span class="lifetime">'de</span>> <span class="kw">for </span>MaxConnectionsVisitor {
<span class="kw">type </span>Value = MaxConnections;
<span class="kw">fn </span>expecting(<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 {
<span class="kw">let </span>msg = <span class="string">"Either \"default\" or a string containing an integer > 0"</span>;
f.write_str(msg)
}
<span class="kw">fn </span>visit_str<E>(<span class="self">self</span>, value: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E>
<span class="kw">where
</span>E: de::Error,
{
<span class="kw">match </span>MaxConnections::parse(value) {
<span class="prelude-val">Ok</span>(max_connections) => <span class="prelude-val">Ok</span>(max_connections),
<span class="prelude-val">Err</span>(Error::InvalidValue { expected, got, .. }) => <span class="prelude-val">Err</span>(
de::Error::invalid_value(de::Unexpected::Str(<span class="kw-2">&</span>got), <span class="kw-2">&</span>expected),
),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(),
}
}
}
deserializer.deserialize_string(MaxConnectionsVisitor)
}
}
</code></pre></div>
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