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Derive for remote crate
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<a href="." >Derive for remote crate</a>
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<h1 id="deriving-deserialize-for-type-in-a-different-crate"><a name="deriving-deserialize-for-type-in-a-different-crate" class="plugin-anchor" href="#deriving-deserialize-for-type-in-a-different-crate"><i class="fa fa-link" aria-hidden="true"></i></a>Deriving De/Serialize for type in a different crate</h1>
<p>Rust's <a href="https://doc.rust-lang.org/book/traits.html#rules-for-implementing-traits" target="_blank">orphan rule</a> requires that either the trait or the type for which you
are implementing the trait must be defined in the same crate as the impl, so it
is not possible to implement <code>Serialize</code> and <code>Deserialize</code> for a type in a
different crate directly.</p>
<pre><code class="lang-diff"><span class="hljs-deletion">- use serde::Serialize;</span>
<span class="hljs-deletion">- use other_crate::Duration;</span>
<span class="hljs-deletion">-</span>
<span class="hljs-deletion">- // Not allowed by orphan rule.</span>
<span class="hljs-deletion">- impl Serialize for Duration {</span>
<span class="hljs-deletion">- /* ... */</span>
<span class="hljs-deletion">- }</span>
</code></pre>
<p>To work around this, Serde provides a way of deriving <code>Serialize</code> and
<code>Deserialize</code> implementations for types in other people's crates. The only catch
is that you have to provide a definition of the type for Serde's derive to
process. At compile time, Serde will check that all the fields in the definition
you provided match the fields in the remote type.</p>
<pre><a class="playground-link" target="_blank" href="https://play.rust-lang.org/?edition=2018&gist=0a344c9dfc4cf965e66125ebdfbc48b8"></a><code class="lang-rust"><span class="hljs-comment">// Pretend that this is somebody else's crate, not a module.</span>
<span class="hljs-keyword">mod</span> other_crate {
<span class="hljs-comment">// Neither Serde nor the other crate provides Serialize and Deserialize</span>
<span class="hljs-comment">// impls for this struct.</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Duration</span></span> {
<span class="hljs-keyword">pub</span> secs: <span class="hljs-keyword">i64</span>,
<span class="hljs-keyword">pub</span> nanos: <span class="hljs-keyword">i32</span>,
}
}
<span class="hljs-comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="hljs-keyword">use</span> other_crate::Duration;
<span class="hljs-keyword">use</span> serde::{Serialize, Deserialize};
<span class="hljs-comment">// Serde calls this the definition of the remote type. It is just a copy of the</span>
<span class="hljs-comment">// remote data structure. The `remote` attribute gives the path to the actual</span>
<span class="hljs-comment">// type we intend to derive code for.</span>
<span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-meta">#[serde(remote = <span class="hljs-meta-string">"Duration"</span>)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">DurationDef</span></span> {
secs: <span class="hljs-keyword">i64</span>,
nanos: <span class="hljs-keyword">i32</span>,
}
<span class="hljs-comment">// Now the remote type can be used almost like it had its own Serialize and</span>
<span class="hljs-comment">// Deserialize impls all along. The `with` attribute gives the path to the</span>
<span class="hljs-comment">// definition for the remote type. Note that the real type of the field is the</span>
<span class="hljs-comment">// remote type, not the definition type.</span>
<span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Process</span></span> {
command_line: <span class="hljs-built_in">String</span>,
<span class="hljs-meta">#[serde(with = <span class="hljs-meta-string">"DurationDef"</span>)]</span>
wall_time: Duration,
}
</code></pre>
<p>If the remote type is a struct with all public fields or an enum, that's all
there is to it. If the remote type is a struct with one or more private fields,
getters must be provided for the private fields and a conversion must be
provided to construct the remote type.</p>
<pre><a class="playground-link" target="_blank" href="https://play.rust-lang.org/?edition=2018&gist=02b8513dfb060b6580f998bac5a04a1a"></a><code class="lang-rust"><span class="hljs-comment">// Pretend that this is somebody else's crate, not a module.</span>
<span class="hljs-keyword">mod</span> other_crate {
<span class="hljs-comment">// Neither Serde nor the other crate provides Serialize and Deserialize</span>
<span class="hljs-comment">// impls for this struct. Oh, and the fields are private.</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Duration</span></span> {
secs: <span class="hljs-keyword">i64</span>,
nanos: <span class="hljs-keyword">i32</span>,
}
<span class="hljs-keyword">impl</span> Duration {
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">new</span></span>(secs: <span class="hljs-keyword">i64</span>, nanos: <span class="hljs-keyword">i32</span>) -> <span class="hljs-keyword">Self</span> {
Duration { secs: secs, nanos: nanos }
}
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">seconds</span></span>(&<span class="hljs-keyword">self</span>) -> <span class="hljs-keyword">i64</span> {
<span class="hljs-keyword">self</span>.secs
}
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">subsec_nanos</span></span>(&<span class="hljs-keyword">self</span>) -> <span class="hljs-keyword">i32</span> {
<span class="hljs-keyword">self</span>.nanos
}
}
}
<span class="hljs-comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="hljs-keyword">use</span> other_crate::Duration;
<span class="hljs-keyword">use</span> serde::{Serialize, Deserialize};
<span class="hljs-comment">// Provide getters for every private field of the remote struct. The getter must</span>
<span class="hljs-comment">// return either `T` or `&T` where `T` is the type of the field.</span>
<span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-meta">#[serde(remote = <span class="hljs-meta-string">"Duration"</span>)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">DurationDef</span></span> {
<span class="hljs-meta">#[serde(getter = <span class="hljs-meta-string">"Duration::seconds"</span>)]</span>
secs: <span class="hljs-keyword">i64</span>,
<span class="hljs-meta">#[serde(getter = <span class="hljs-meta-string">"Duration::subsec_nanos"</span>)]</span>
nanos: <span class="hljs-keyword">i32</span>,
}
<span class="hljs-comment">// Provide a conversion to construct the remote type.</span>
<span class="hljs-keyword">impl</span> <span class="hljs-built_in">From</span><DurationDef> <span class="hljs-keyword">for</span> Duration {
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">from</span></span>(def: DurationDef) -> Duration {
Duration::new(def.secs, def.nanos)
}
}
<span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Process</span></span> {
command_line: <span class="hljs-built_in">String</span>,
<span class="hljs-meta">#[serde(with = <span class="hljs-meta-string">"DurationDef"</span>)]</span>
wall_time: Duration,
}
</code></pre>
<h2 id="invoking-the-remote-impl-directly"><a name="invoking-the-remote-impl-directly" class="plugin-anchor" href="#invoking-the-remote-impl-directly"><i class="fa fa-link" aria-hidden="true"></i></a>Invoking the remote impl directly</h2>
<p>As shown above, the remote impl is intended to be invoked through a
<code>#[serde(with = "...")]</code> attribute on a field of some other struct.</p>
<p>Invoking the remote impl directly, such as if this is the top-level type being
serialized or deserialized, is somewhat more complicated because of the orphan
rules as mentioned. The code ultimately generated by these remote derives are
not <code>Serialize</code> and <code>Deserialize</code> impls but associated functions with the same
signature.</p>
<pre><code class="lang-rust"><span class="hljs-comment">// Technically this derive does not produce a Deserialize impl for Duration, nor</span>
<span class="hljs-comment">// a Deserialize impl for DurationDef.</span>
<span class="hljs-comment">//</span>
<span class="hljs-comment">// Instead it produces a deserialization method DurationDef::deserialize whose</span>
<span class="hljs-comment">// return type is Duration. The method has the same signature as a Deserialize</span>
<span class="hljs-comment">// impl for Duration would have but is not a Deserialize impl.</span>
<span class="hljs-meta">#[derive(Deserialize)]</span>
<span class="hljs-meta">#[serde(remote = <span class="hljs-meta-string">"Duration"</span>)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">DurationDef</span></span> {
secs: <span class="hljs-keyword">i64</span>,
nanos: <span class="hljs-keyword">i32</span>,
}
</code></pre>
<p>Knowing this, the generated method can be invoked directly by passing a
<code>Deserializer</code> implementation.</p>
<pre><a class="playground-link" target="_blank" href="https://play.rust-lang.org/?edition=2018&gist=29cadbd640a231d5703564a666b0bc85"></a><code class="lang-rust"><span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> de = serde_json::Deserializer::from_str(j);
<span class="hljs-keyword">let</span> dur = DurationDef::deserialize(&<span class="hljs-keyword">mut</span> de)?;
<span class="hljs-comment">// `dur` has type Duration</span>
</code></pre>
<p>Alternatively we can write a top-level newtype wrapper as a private helper for
deserializing the remote type.</p>
<pre><a class="playground-link" target="_blank" href="https://play.rust-lang.org/?edition=2018&gist=159da6ebf3a3573b8bd7f3bc2246026c"></a><code class="lang-rust"><span class="hljs-meta">#[derive(Deserialize)]</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Helper</span></span>(<span class="hljs-meta">#[serde(with = <span class="hljs-meta-string">"DurationDef"</span>)]</span> Duration);
<span class="hljs-keyword">let</span> dur = serde_json::from_str(j).map(|Helper(dur)| dur)?;
<span class="hljs-comment">// `dur` has type Duration</span>
</code></pre>
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