<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `widgetry/src/tools/load.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>load.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" 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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">"wasm32"</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">"wasm32"</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">"wasm32"</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"><</span><span class="ident">u8</span><span class="op">></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">"wasm32"</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">&mut</span> <span class="ident">Timer</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></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"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></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"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="kw-2">&mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">></span> <span class="ident">FileLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></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">&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"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="kw-2">&mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>, ) -> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></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"><</span><span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FileLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&mut</span> <span class="ident">A</span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { <span class="macro">debug!</span>(<span class="string">"Loading {}"</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">"load {}"</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">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</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"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">DeserializeOwned</span><span class="op">></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">&mut</span> <span class="ident">Timer</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="comment">// TODO We'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">&mut</span> <span class="ident">Timer</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawBytes</span><span class="op">></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">"wasm32"</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"><</span><span class="ident">u8</span><span class="op">></span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></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 "polling" for completion in a way that's</span> <span class="doccomment">/// compatible with winit's event loop.</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">FileLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> { <span class="ident">response</span>: <span class="ident">oneshot::Receiver</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span><span class="op">></span><span class="op">></span>, <span class="ident">on_load</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="kw-2">&mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span><span class="op">></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"><</span><span class="ident">usize</span><span class="op">></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"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">got_read_bytes</span>: <span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">></span> <span class="ident">FileLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></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">&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"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="kw-2">&mut</span> <span class="ident">Timer</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>, ) -> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></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">"assets_base_url must be specified for wasm builds via `Settings`"</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'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">"{}/{}.gz"</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">"{}/{}"</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">"Loading {}"</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">"GET"</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">&</span><span class="ident">url_copy</span>, <span class="kw-2">&</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">&</span><span class="ident">request</span>)).<span class="kw">await</span> { <span class="prelude-val">Ok</span>(<span class="ident">resp_value</span>) => { <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">"Content-Length"</span>) .<span class="ident">unwrap</span>() .<span class="ident">unwrap</span>() .<span class="ident">parse</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></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">&</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">"Couldn't send update on bytes: {}"</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">"HTTP {}: {}"</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>) => { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">"{:?}"</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">"Loading {}..."</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"><</span><span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Readable</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FileLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&mut</span> <span class="ident">A</span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></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">"Loading {}..."</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">&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">"Loading {}..."</span>, <span class="self">self</span>.<span class="ident">url</span>)), <span class="ident">Line</span>(<span class="macro">format!</span>( <span class="string">"Time spent: {}"</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">"Read {} / {} bytes"</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">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</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"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">DeserializeOwned</span><span class="op">></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"><</span><span class="ident">u8</span><span class="op">></span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">".gz"</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">&</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">".bin.gz"</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">".bin"</span>) { <span class="ident">abstutil::from_binary</span>(<span class="op">&&</span><span class="ident">resp</span>) } <span class="kw">else</span> { <span class="ident">abstutil::from_json</span>(<span class="op">&&</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"><</span><span class="ident">u8</span><span class="op">></span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RawBytes</span><span class="op">></span> { <span class="kw">if</span> <span class="ident">url</span>.<span class="ident">ends_with</span>(<span class="string">".gz"</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">&</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"><</span><span class="ident">u8</span><span class="op">></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">&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"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></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"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">A</span>) -> <span class="ident">T</span><span class="op">></span><span class="op">></span><span class="op">></span>, <span class="ident">on_load</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span><span class="op">></span>, <span class="comment">// These'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"><</span><span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span><span class="op">></span>, <span class="ident">inner_progress_receiver</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span><span class="op">></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'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">"wasm32"</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"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FutureLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span>, { <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</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">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">future</span>: <span class="ident">Pin</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Future</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">A</span>) -> <span class="ident">T</span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span>, <span class="ident">outer_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">inner_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">loading_title</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>, ) -> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></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">"wasm32"</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">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">future</span>: <span class="ident">Pin</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Future</span><span class="op"><</span><span class="ident">Output</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">A</span>) -> <span class="ident">T</span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span><span class="op">></span>, <span class="ident">outer_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">inner_progress_receiver</span>: <span class="ident">mpsc::Receiver</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">loading_title</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">on_load</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">FnOnce</span>(<span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&mut</span> <span class="ident">A</span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></span>, ) -> <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span><span class="op">></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"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">State</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="kw">for</span> <span class="ident">FutureLoader</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="lifetime">'static</span>, <span class="ident">T</span>: <span class="lifetime">'static</span>, { <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">app</span>: <span class="kw-2">&mut</span> <span class="ident">A</span>) -> <span class="ident">Transition</span><span class="op"><</span><span class="ident">A</span><span class="op">></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>) => { <span class="macro">error!</span>(<span class="string">"channel failed: {:?}"</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">"channel canceled"</span>))) } <span class="prelude-val">Ok</span>(<span class="prelude-val">None</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">outer_progress_receiver</span> { <span class="comment">// Read all of the progress that'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>)) => { <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>) => { <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>) => { <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>)) => { <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>) => { <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>) => { <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">&</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">"Time spent: {}"</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">&</span><span class="self">self</span>.<span class="ident">last_outer_progress</span>), <span class="ident">Line</span>(<span class="kw-2">&</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>))) => { <span class="macro">error!</span>(<span class="string">"error in fetching data"</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>))) => { <span class="macro">debug!</span>(<span class="string">"future complete"</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">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&mut</span> <span class="ident">GfxCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</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> </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="widgetry" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.61.0 (fe5b13d68 2022-05-18)" ></div> </body></html>