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</pre><pre class="rust"><code><span class="doccomment">//! Loading large resources requires different strategies on native and web. Both cases are wrapped</span>
<span class="doccomment">//! up as a State that runs a callback when done.</span>

<span class="kw">use</span> <span class="ident">std::future::Future</span>;
<span class="kw">use</span> <span class="ident">std::pin::Pin</span>;

<span class="kw">use</span> <span class="ident">anyhow::Result</span>;
<span class="kw">use</span> <span class="ident">futures_channel</span>::{<span class="ident">mpsc</span>, <span class="ident">oneshot</span>};
<span class="kw">use</span> <span class="ident">instant::Instant</span>;
<span class="kw">use</span> <span class="ident">serde::de::DeserializeOwned</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
<span class="kw">use</span> <span class="ident">tokio::runtime::Runtime</span>;

<span class="kw">use</span> <span class="ident">abstutil::Timer</span>;
<span class="kw">use</span> <span class="ident">geom::Duration</span>;

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Color</span>, <span class="ident">EventCtx</span>, <span class="ident">GfxCtx</span>, <span class="ident">Line</span>, <span class="ident">Panel</span>, <span class="ident">State</span>, <span class="ident">Text</span>, <span class="ident">Transition</span>, <span class="ident">UpdateType</span>};

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">native_loader::FileLoader</span>;

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">wasm_loader::FileLoader</span>;

<span class="doccomment">/// Use this with FileLoader to just read raw bytes without any deserialization.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RawBytes</span>(<span class="kw">pub</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>);

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
<span class="kw">mod</span> <span class="ident">native_loader</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Readable</span> {
        <span class="kw">fn</span> <span class="ident">read_file</span>(<span class="ident">path</span>: <span class="ident">String</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
        <span class="kw">where</span>
            <span class="self">Self</span>: <span class="ident">Sized</span>;
    }

    <span class="doccomment">/// Loads a JSON, bincoded, or raw file, then deserializes it</span>
    <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">path</span>: <span class="ident">String</span>,
        <span class="comment">// Wrapped in an Option just to make calling from event() work. Technically this is unsafe</span>
        <span class="comment">// if a caller fails to pop the FileLoader state in their transitions!</span>
        <span class="ident">on_load</span>:
            <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    }

    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="lifetime">&#39;static</span>, <span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">&gt;</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(
            <span class="kw">_</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
            <span class="ident">path</span>: <span class="ident">String</span>,
            <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        ) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span> {
            <span class="ident">Box::new</span>(<span class="ident">FileLoader</span> {
                <span class="ident">path</span>,
                <span class="ident">on_load</span>: <span class="prelude-val">Some</span>(<span class="ident">on_load</span>),
            })
        }
    }

    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="lifetime">&#39;static</span>, <span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">&gt;</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;mut</span> <span class="ident">A</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
            <span class="macro">debug!</span>(<span class="string">&quot;Loading {}&quot;</span>, <span class="self">self</span>.<span class="ident">path</span>);
            <span class="ident">ctx</span>.<span class="ident">loading_screen</span>(<span class="macro">format!</span>(<span class="string">&quot;load {}&quot;</span>, <span class="self">self</span>.<span class="ident">path</span>), <span class="op">|</span><span class="ident">ctx</span>, <span class="ident">timer</span><span class="op">|</span> {
                <span class="kw">let</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">T::read_file</span>(<span class="self">self</span>.<span class="ident">path</span>.<span class="ident">clone</span>(), <span class="ident">timer</span>);
                (<span class="self">self</span>.<span class="ident">on_load</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>())(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">timer</span>, <span class="ident">file</span>)
            })
        }

        <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>) {
            <span class="ident">g</span>.<span class="ident">clear</span>(<span class="ident">Color::BLACK</span>);
        }
    }

    <span class="comment">// Two implementations for reading the file, using serde or just raw bytes</span>
    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">DeserializeOwned</span><span class="op">&gt;</span> <span class="ident">Readable</span> <span class="kw">for</span> <span class="ident">T</span> {
        <span class="kw">fn</span> <span class="ident">read_file</span>(<span class="ident">path</span>: <span class="ident">String</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
            <span class="comment">// TODO We&#39;ll eventually want to remove the dependency on abstio</span>
            <span class="ident">abstio::read_object</span>(<span class="ident">path</span>, <span class="ident">timer</span>)
        }
    }
    <span class="kw">impl</span> <span class="ident">Readable</span> <span class="kw">for</span> <span class="ident">RawBytes</span> {
        <span class="kw">fn</span> <span class="ident">read_file</span>(<span class="ident">path</span>: <span class="ident">String</span>, <span class="kw">_</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">RawBytes</span><span class="op">&gt;</span> {
            <span class="ident">abstio::slurp_file</span>(<span class="ident">path</span>).<span class="ident">map</span>(<span class="ident">RawBytes</span>)
        }
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
<span class="kw">mod</span> <span class="ident">wasm_loader</span> {
    <span class="kw">use</span> <span class="ident">std::io::Read</span>;

    <span class="kw">use</span> <span class="ident">futures::StreamExt</span>;
    <span class="kw">use</span> <span class="ident">wasm_bindgen</span>::{<span class="ident">JsCast</span>, <span class="ident">UnwrapThrowExt</span>};
    <span class="kw">use</span> <span class="ident">wasm_bindgen_futures::JsFuture</span>;
    <span class="kw">use</span> <span class="ident">wasm_streams::ReadableStream</span>;
    <span class="kw">use</span> <span class="ident">web_sys</span>::{<span class="ident">Request</span>, <span class="ident">RequestInit</span>, <span class="ident">RequestMode</span>, <span class="ident">Response</span>};

    <span class="kw">use</span> <span class="ident">abstutil::prettyprint_usize</span>;

    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Readable</span> {
        <span class="kw">fn</span> <span class="ident">read_url</span>(<span class="ident">url</span>: <span class="ident">String</span>, <span class="ident">resp</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span>
        <span class="kw">where</span>
            <span class="self">Self</span>: <span class="ident">Sized</span>;
    }

    <span class="doccomment">/// Loads a JSON, bincoded, or raw file, then deserializes it</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// Instead of blockingly reading a file within ctx.loading_screen, on the web have to</span>
    <span class="doccomment">/// asynchronously make an HTTP request and keep &quot;polling&quot; for completion in a way that&#39;s</span>
    <span class="doccomment">/// compatible with winit&#39;s event loop.</span>
    <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">response</span>: <span class="ident">oneshot::Receiver</span><span class="op">&lt;</span><span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        <span class="ident">on_load</span>:
            <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        <span class="ident">panel</span>: <span class="ident">Panel</span>,
        <span class="ident">started</span>: <span class="ident">Instant</span>,
        <span class="ident">url</span>: <span class="ident">String</span>,

        <span class="ident">total_bytes</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
        <span class="ident">read_bytes</span>: <span class="ident">usize</span>,
        <span class="ident">got_total_bytes</span>: <span class="ident">oneshot::Receiver</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
        <span class="ident">got_read_bytes</span>: <span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>,
    }

    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="lifetime">&#39;static</span>, <span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">&gt;</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(
            <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
            <span class="ident">path</span>: <span class="ident">String</span>,
            <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="kw-2">&amp;mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        ) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span> {
            <span class="kw">let</span> <span class="ident">base_url</span> <span class="op">=</span> <span class="ident">ctx</span>
                .<span class="ident">prerender</span>
                .<span class="ident">assets_base_url</span>()
                .<span class="ident">expect</span>(<span class="string">&quot;assets_base_url must be specified for wasm builds via `Settings`&quot;</span>);

            <span class="comment">// Note that files are gzipped on S3 and other deployments. When running locally, we</span>
            <span class="comment">// just symlink the data/ directory, where files aren&#39;t compressed.</span>
            <span class="kw">let</span> <span class="ident">url</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">prerender</span>.<span class="ident">assets_are_gzipped</span>() {
                <span class="macro">format!</span>(<span class="string">&quot;{}/{}.gz&quot;</span>, <span class="ident">base_url</span>, <span class="ident">path</span>)
            } <span class="kw">else</span> {
                <span class="macro">format!</span>(<span class="string">&quot;{}/{}&quot;</span>, <span class="ident">base_url</span>, <span class="ident">path</span>)
            };

            <span class="comment">// Make the HTTP request nonblockingly. When the response is received, send it through</span>
            <span class="comment">// the channel.</span>
            <span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">oneshot::channel</span>();
            <span class="kw">let</span> (<span class="ident">tx_total_bytes</span>, <span class="ident">got_total_bytes</span>) <span class="op">=</span> <span class="ident">oneshot::channel</span>();
            <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">tx_read_bytes</span>, <span class="ident">got_read_bytes</span>) <span class="op">=</span> <span class="ident">mpsc::channel</span>(<span class="number">10</span>);
            <span class="kw">let</span> <span class="ident">url_copy</span> <span class="op">=</span> <span class="ident">url</span>.<span class="ident">clone</span>();
            <span class="macro">debug!</span>(<span class="string">&quot;Loading {}&quot;</span>, <span class="ident">url_copy</span>);
            <span class="ident">wasm_bindgen_futures::spawn_local</span>(<span class="kw">async</span> <span class="kw">move</span> {
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">opts</span> <span class="op">=</span> <span class="ident">RequestInit::new</span>();
                <span class="ident">opts</span>.<span class="ident">method</span>(<span class="string">&quot;GET&quot;</span>);
                <span class="ident">opts</span>.<span class="ident">mode</span>(<span class="ident">RequestMode::Cors</span>);
                <span class="kw">let</span> <span class="ident">request</span> <span class="op">=</span> <span class="ident">Request::new_with_str_and_init</span>(<span class="kw-2">&amp;</span><span class="ident">url_copy</span>, <span class="kw-2">&amp;</span><span class="ident">opts</span>).<span class="ident">unwrap</span>();

                <span class="kw">let</span> <span class="ident">window</span> <span class="op">=</span> <span class="ident">web_sys::window</span>().<span class="ident">unwrap</span>();
                <span class="kw">match</span> <span class="ident">JsFuture::from</span>(<span class="ident">window</span>.<span class="ident">fetch_with_request</span>(<span class="kw-2">&amp;</span><span class="ident">request</span>)).<span class="kw">await</span> {
                    <span class="prelude-val">Ok</span>(<span class="ident">resp_value</span>) =&gt; {
                        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">Response</span> <span class="op">=</span> <span class="ident">resp_value</span>.<span class="ident">dyn_into</span>().<span class="ident">unwrap</span>();
                        <span class="kw">if</span> <span class="ident">resp</span>.<span class="ident">ok</span>() {
                            <span class="kw">let</span> <span class="ident">total_bytes</span> <span class="op">=</span> <span class="ident">resp</span>
                                .<span class="ident">headers</span>()
                                .<span class="ident">get</span>(<span class="string">&quot;Content-Length&quot;</span>)
                                .<span class="ident">unwrap</span>()
                                .<span class="ident">unwrap</span>()
                                .<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span>()
                                .<span class="ident">unwrap</span>();
                            <span class="ident">tx_total_bytes</span>.<span class="ident">send</span>(<span class="ident">total_bytes</span>).<span class="ident">unwrap</span>();

                            <span class="kw">let</span> <span class="ident">raw_body</span> <span class="op">=</span> <span class="ident">resp</span>.<span class="ident">body</span>().<span class="ident">unwrap_throw</span>();
                            <span class="kw">let</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">ReadableStream::from_raw</span>(<span class="ident">raw_body</span>.<span class="ident">dyn_into</span>().<span class="ident">unwrap_throw</span>());
                            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">body</span>.<span class="ident">into_stream</span>();
                            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
                            <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">chunk</span>)) <span class="op">=</span> <span class="ident">stream</span>.<span class="ident">next</span>().<span class="kw">await</span> {
                                <span class="kw">let</span> <span class="ident">array</span> <span class="op">=</span> <span class="ident">js_sys::Uint8Array::new</span>(<span class="kw-2">&amp;</span><span class="ident">chunk</span>);
                                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span>
                                    <span class="ident">tx_read_bytes</span>.<span class="ident">try_send</span>(<span class="ident">array</span>.<span class="ident">byte_length</span>() <span class="kw">as</span> <span class="ident">usize</span>)
                                {
                                    <span class="macro">warn!</span>(<span class="string">&quot;Couldn&#39;t send update on bytes: {}&quot;</span>, <span class="ident">err</span>);
                                }
                                <span class="comment">// TODO Can we avoid this clone?</span>
                                <span class="ident">buffer</span>.<span class="ident">extend</span>(<span class="ident">array</span>.<span class="ident">to_vec</span>());
                            }
                            <span class="ident">tx</span>.<span class="ident">send</span>(<span class="prelude-val">Ok</span>(<span class="ident">buffer</span>)).<span class="ident">unwrap</span>();
                        } <span class="kw">else</span> {
                            <span class="kw">let</span> <span class="ident">status</span> <span class="op">=</span> <span class="ident">resp</span>.<span class="ident">status</span>();
                            <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">resp</span>.<span class="ident">status_text</span>();
                            <span class="ident">tx</span>.<span class="ident">send</span>(<span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;HTTP {}: {}&quot;</span>, <span class="ident">status</span>, <span class="ident">err</span>))).<span class="ident">unwrap</span>();
                        }
                    }
                    <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                        <span class="ident">tx</span>.<span class="ident">send</span>(<span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">err</span>))).<span class="ident">unwrap</span>();
                    }
                }
            });

            <span class="ident">Box::new</span>(<span class="ident">FileLoader</span> {
                <span class="ident">response</span>: <span class="ident">rx</span>,
                <span class="ident">on_load</span>: <span class="prelude-val">Some</span>(<span class="ident">on_load</span>),
                <span class="ident">panel</span>: <span class="ident">ctx</span>.<span class="ident">make_loading_screen</span>(<span class="ident">Text::from</span>(<span class="macro">format!</span>(<span class="string">&quot;Loading {}...&quot;</span>, <span class="ident">url</span>))),
                <span class="ident">started</span>: <span class="ident">Instant::now</span>(),
                <span class="ident">url</span>,
                <span class="ident">total_bytes</span>: <span class="prelude-val">None</span>,
                <span class="ident">read_bytes</span>: <span class="number">0</span>,
                <span class="ident">got_total_bytes</span>,
                <span class="ident">got_read_bytes</span>,
            })
        }
    }

    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="lifetime">&#39;static</span>, <span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">&gt;</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">FileLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
        <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;mut</span> <span class="ident">A</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">total_bytes</span>.<span class="ident">is_none</span>() {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">total</span>)) <span class="op">=</span> <span class="self">self</span>.<span class="ident">got_total_bytes</span>.<span class="ident">try_recv</span>() {
                    <span class="self">self</span>.<span class="ident">total_bytes</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">total</span>);
                }
            }
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">read</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">got_read_bytes</span>.<span class="ident">try_next</span>().<span class="ident">ok</span>().<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">value</span><span class="op">|</span> <span class="ident">value</span>) {
                <span class="self">self</span>.<span class="ident">read_bytes</span> <span class="op">+</span><span class="op">=</span> <span class="ident">read</span>;
            }

            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">maybe_resp</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">response</span>.<span class="ident">try_recv</span>().<span class="ident">unwrap</span>() {
                <span class="comment">// TODO We stop drawing and start blocking at this point. It can take a</span>
                <span class="comment">// while. Any way to make it still be nonblockingish? Maybe put some of the work</span>
                <span class="comment">// inside that spawn_local?</span>
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">timer</span> <span class="op">=</span> <span class="ident">Timer::new</span>(<span class="macro">format!</span>(<span class="string">&quot;Loading {}...&quot;</span>, <span class="self">self</span>.<span class="ident">url</span>));
                <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">maybe_resp</span>.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">resp</span><span class="op">|</span> <span class="ident">T::read_url</span>(<span class="self">self</span>.<span class="ident">url</span>.<span class="ident">clone</span>(), <span class="ident">resp</span>));
                <span class="kw">return</span> (<span class="self">self</span>.<span class="ident">on_load</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>())(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="kw-2">&amp;mut</span> <span class="ident">timer</span>, <span class="ident">result</span>);
            }

            <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lines</span> <span class="op">=</span> <span class="macro">vec!</span>[
                <span class="ident">Line</span>(<span class="macro">format!</span>(<span class="string">&quot;Loading {}...&quot;</span>, <span class="self">self</span>.<span class="ident">url</span>)),
                <span class="ident">Line</span>(<span class="macro">format!</span>(
                    <span class="string">&quot;Time spent: {}&quot;</span>,
                    <span class="ident">Duration::realtime_elapsed</span>(<span class="self">self</span>.<span class="ident">started</span>)
                )),
            ];
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">total</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">total_bytes</span> {
                <span class="ident">lines</span>.<span class="ident">push</span>(<span class="ident">Line</span>(<span class="macro">format!</span>(
                    <span class="string">&quot;Read {} / {} bytes&quot;</span>,
                    <span class="ident">prettyprint_usize</span>(<span class="self">self</span>.<span class="ident">read_bytes</span>),
                    <span class="ident">prettyprint_usize</span>(<span class="ident">total</span>)
                )));
            }
            <span class="self">self</span>.<span class="ident">panel</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">make_loading_screen</span>(<span class="ident">Text::from_multiline</span>(<span class="ident">lines</span>));

            <span class="comment">// Until the response is received, just ask winit to regularly call event(), so we can</span>
            <span class="comment">// keep polling the channel.</span>
            <span class="ident">ctx</span>.<span class="ident">request_update</span>(<span class="ident">UpdateType::Game</span>);
            <span class="ident">Transition::Keep</span>
        }

        <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>) {
            <span class="comment">// TODO Progress bar for bytes received</span>
            <span class="ident">g</span>.<span class="ident">clear</span>(<span class="ident">Color::BLACK</span>);
            <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
        }
    }

    <span class="comment">// Two implementations for reading the file, using serde or just raw bytes</span>
    <span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="lifetime">&#39;static</span> <span class="op">+</span> <span class="ident">DeserializeOwned</span><span class="op">&gt;</span> <span class="ident">Readable</span> <span class="kw">for</span> <span class="ident">T</span> {
        <span class="kw">fn</span> <span class="ident">read_url</span>(<span class="ident">url</span>: <span class="ident">String</span>, <span class="ident">resp</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
            <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">&quot;.gz&quot;</span>) {
                <span class="kw">let</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">flate2::read::GzDecoder::new</span>(<span class="kw-2">&amp;</span><span class="ident">resp</span>[..]);
                <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">&quot;.bin.gz&quot;</span>) {
                    <span class="ident">abstutil::from_binary_reader</span>(<span class="ident">decoder</span>)
                } <span class="kw">else</span> {
                    <span class="ident">abstutil::from_json_reader</span>(<span class="ident">decoder</span>)
                }
            } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">&quot;.bin&quot;</span>) {
                <span class="ident">abstutil::from_binary</span>(<span class="op">&amp;&amp;</span><span class="ident">resp</span>)
            } <span class="kw">else</span> {
                <span class="ident">abstutil::from_json</span>(<span class="op">&amp;&amp;</span><span class="ident">resp</span>)
            }
        }
    }
    <span class="kw">impl</span> <span class="ident">Readable</span> <span class="kw">for</span> <span class="ident">RawBytes</span> {
        <span class="kw">fn</span> <span class="ident">read_url</span>(<span class="ident">url</span>: <span class="ident">String</span>, <span class="ident">resp</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">RawBytes</span><span class="op">&gt;</span> {
            <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">&quot;.gz&quot;</span>) {
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoder</span> <span class="op">=</span> <span class="ident">flate2::read::GzDecoder::new</span>(<span class="kw-2">&amp;</span><span class="ident">resp</span>[..]);
                <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec::new</span>();
                <span class="ident">decoder</span>
                    .<span class="ident">read_to_end</span>(<span class="kw-2">&amp;mut</span> <span class="ident">buffer</span>)
                    .<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">RawBytes</span>(<span class="ident">buffer</span>))
                    .<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="ident">err</span>.<span class="ident">into</span>())
            } <span class="kw">else</span> {
                <span class="prelude-val">Ok</span>(<span class="ident">RawBytes</span>(<span class="ident">resp</span>))
            }
        }
    }
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FutureLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> {
    <span class="ident">loading_title</span>: <span class="ident">String</span>,
    <span class="ident">started</span>: <span class="ident">Instant</span>,
    <span class="ident">panel</span>: <span class="ident">Panel</span>,
    <span class="ident">receiver</span>: <span class="ident">oneshot::Receiver</span><span class="op">&lt;</span><span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="ident">A</span>) -&gt; <span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">on_load</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="comment">// These&#39;re just two different types of progress updates that callers can provide</span>
    <span class="ident">outer_progress_receiver</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">inner_progress_receiver</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">last_outer_progress</span>: <span class="ident">String</span>,
    <span class="ident">last_inner_progress</span>: <span class="ident">String</span>,

    <span class="comment">// If Runtime is dropped, any active tasks will be canceled, so we retain it here even</span>
    <span class="comment">// though we never access it. It might make more sense for Runtime to live on App if we&#39;re</span>
    <span class="comment">// going to be doing more background spawning.</span>
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
    <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
    <span class="ident">runtime</span>: <span class="ident">Runtime</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">FutureLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">A</span>: <span class="lifetime">&#39;static</span>,
    <span class="ident">T</span>: <span class="lifetime">&#39;static</span>,
{
    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">future</span>: <span class="ident">Pin</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Future</span><span class="op">&lt;</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="ident">A</span>) -&gt; <span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        <span class="ident">outer_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
        <span class="ident">inner_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
        <span class="ident">loading_title</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    ) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">receiver</span>) <span class="op">=</span> <span class="ident">oneshot::channel</span>();
        <span class="ident">wasm_bindgen_futures::spawn_local</span>(<span class="kw">async</span> <span class="kw">move</span> {
            <span class="ident">tx</span>.<span class="ident">send</span>(<span class="ident">future</span>.<span class="kw">await</span>).<span class="ident">ok</span>().<span class="ident">unwrap</span>();
        });
        <span class="ident">Box::new</span>(<span class="ident">FutureLoader</span> {
            <span class="ident">loading_title</span>: <span class="ident">loading_title</span>.<span class="ident">to_string</span>(),
            <span class="ident">started</span>: <span class="ident">Instant::now</span>(),
            <span class="ident">panel</span>: <span class="ident">ctx</span>.<span class="ident">make_loading_screen</span>(<span class="ident">Text::from</span>(<span class="ident">loading_title</span>)),
            <span class="ident">receiver</span>,
            <span class="ident">on_load</span>: <span class="prelude-val">Some</span>(<span class="ident">on_load</span>),
            <span class="ident">outer_progress_receiver</span>: <span class="prelude-val">Some</span>(<span class="ident">outer_progress_receiver</span>),
            <span class="ident">inner_progress_receiver</span>: <span class="prelude-val">Some</span>(<span class="ident">inner_progress_receiver</span>),
            <span class="ident">last_outer_progress</span>: <span class="ident">String::new</span>(),
            <span class="ident">last_inner_progress</span>: <span class="ident">String::new</span>(),
        })
    }

    <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">future</span>: <span class="ident">Pin</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Future</span><span class="op">&lt;</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;</span><span class="ident">A</span>) -&gt; <span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
        <span class="ident">outer_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
        <span class="ident">inner_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
        <span class="ident">loading_title</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    ) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">runtime</span> <span class="op">=</span> <span class="ident">Runtime::new</span>().<span class="ident">unwrap</span>();
        <span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">receiver</span>) <span class="op">=</span> <span class="ident">oneshot::channel</span>();
        <span class="ident">runtime</span>.<span class="ident">spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
            <span class="ident">tx</span>.<span class="ident">send</span>(<span class="ident">future</span>.<span class="kw">await</span>).<span class="ident">ok</span>().<span class="ident">unwrap</span>();
        });

        <span class="ident">Box::new</span>(<span class="ident">FutureLoader</span> {
            <span class="ident">loading_title</span>: <span class="ident">loading_title</span>.<span class="ident">to_string</span>(),
            <span class="ident">started</span>: <span class="ident">Instant::now</span>(),
            <span class="ident">panel</span>: <span class="ident">ctx</span>.<span class="ident">make_loading_screen</span>(<span class="ident">Text::from</span>(<span class="ident">loading_title</span>)),
            <span class="ident">receiver</span>,
            <span class="ident">on_load</span>: <span class="prelude-val">Some</span>(<span class="ident">on_load</span>),
            <span class="ident">runtime</span>,
            <span class="ident">outer_progress_receiver</span>: <span class="prelude-val">Some</span>(<span class="ident">outer_progress_receiver</span>),
            <span class="ident">inner_progress_receiver</span>: <span class="prelude-val">Some</span>(<span class="ident">inner_progress_receiver</span>),
            <span class="ident">last_outer_progress</span>: <span class="ident">String::new</span>(),
            <span class="ident">last_inner_progress</span>: <span class="ident">String::new</span>(),
        })
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">FutureLoader</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">A</span>: <span class="lifetime">&#39;static</span>,
    <span class="ident">T</span>: <span class="lifetime">&#39;static</span>,
{
    <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&amp;mut</span> <span class="ident">A</span>) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">receiver</span>.<span class="ident">try_recv</span>() {
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) =&gt; {
                <span class="macro">error!</span>(<span class="string">&quot;channel failed: {:?}&quot;</span>, <span class="ident">e</span>);
                <span class="kw">let</span> <span class="ident">on_load</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">on_load</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
                <span class="ident">on_load</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;channel canceled&quot;</span>)))
            }
            <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">rx</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">outer_progress_receiver</span> {
                    <span class="comment">// Read all of the progress that&#39;s happened</span>
                    <span class="kw">loop</span> {
                        <span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">try_next</span>() {
                            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">msg</span>)) =&gt; {
                                <span class="self">self</span>.<span class="ident">last_outer_progress</span> <span class="op">=</span> <span class="ident">msg</span>;
                            }
                            <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
                                <span class="self">self</span>.<span class="ident">outer_progress_receiver</span> <span class="op">=</span> <span class="prelude-val">None</span>;
                                <span class="kw">break</span>;
                            }
                            <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
                                <span class="comment">// No messages</span>
                                <span class="kw">break</span>;
                            }
                        }
                    }
                }
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">rx</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner_progress_receiver</span> {
                    <span class="kw">loop</span> {
                        <span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">try_next</span>() {
                            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">msg</span>)) =&gt; {
                                <span class="self">self</span>.<span class="ident">last_inner_progress</span> <span class="op">=</span> <span class="ident">msg</span>;
                            }
                            <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>) =&gt; {
                                <span class="self">self</span>.<span class="ident">inner_progress_receiver</span> <span class="op">=</span> <span class="prelude-val">None</span>;
                                <span class="kw">break</span>;
                            }
                            <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
                                <span class="comment">// No messages</span>
                                <span class="kw">break</span>;
                            }
                        }
                    }
                }

                <span class="self">self</span>.<span class="ident">panel</span> <span class="op">=</span> <span class="ident">ctx</span>.<span class="ident">make_loading_screen</span>(<span class="ident">Text::from_multiline</span>(<span class="macro">vec!</span>[
                    <span class="ident">Line</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">loading_title</span>),
                    <span class="ident">Line</span>(<span class="macro">format!</span>(
                        <span class="string">&quot;Time spent: {}&quot;</span>,
                        <span class="ident">Duration::realtime_elapsed</span>(<span class="self">self</span>.<span class="ident">started</span>)
                    )),
                    <span class="ident">Line</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">last_outer_progress</span>),
                    <span class="ident">Line</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">last_inner_progress</span>),
                ]));

                <span class="comment">// Until the response is received, just ask winit to regularly call event(), so we</span>
                <span class="comment">// can keep polling the channel.</span>
                <span class="ident">ctx</span>.<span class="ident">request_update</span>(<span class="ident">UpdateType::Game</span>);
                <span class="ident">Transition::Keep</span>
            }
            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">e</span>))) =&gt; {
                <span class="macro">error!</span>(<span class="string">&quot;error in fetching data&quot;</span>);
                <span class="kw">let</span> <span class="ident">on_load</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">on_load</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
                <span class="ident">on_load</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="prelude-val">Err</span>(<span class="ident">e</span>))
            }
            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">builder</span>))) =&gt; {
                <span class="macro">debug!</span>(<span class="string">&quot;future complete&quot;</span>);
                <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">builder</span>(<span class="ident">app</span>);
                <span class="kw">let</span> <span class="ident">on_load</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">on_load</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>();
                <span class="ident">on_load</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="prelude-val">Ok</span>(<span class="ident">t</span>))
            }
        }
    }

    <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&amp;mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>) {
        <span class="ident">g</span>.<span class="ident">clear</span>(<span class="ident">Color::BLACK</span>);
        <span class="self">self</span>.<span class="ident">panel</span>.<span class="ident">draw</span>(<span class="ident">g</span>);
    }
}
</code></pre></div>
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