adf2475dab
# Objective Help users who are using `load_folder` in wasm builds to find a slightly shorter path to figuring out why their stuff is broken. ## Solution Adds a warning to `read_directory` in the `WasmAssetIo`. This is extremely similar to the warning already emitted a few lines below for `watch_for_changes`.
82 lines
2.5 KiB
Rust
82 lines
2.5 KiB
Rust
use crate::{AssetIo, AssetIoError, Metadata};
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use anyhow::Result;
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use bevy_utils::BoxedFuture;
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use js_sys::Uint8Array;
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use std::{
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convert::TryFrom,
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path::{Path, PathBuf},
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};
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use wasm_bindgen::JsCast;
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use wasm_bindgen_futures::JsFuture;
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use web_sys::Response;
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/// I/O implementation for web builds.
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///
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/// Implementation details:
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///
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/// - `load_path` makes [fetch()] requests.
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/// - `read_directory` always returns an empty iterator.
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/// - `get_metadata` will always return an error.
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/// - Watching for changes is not supported. The watcher methods will do nothing.
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///
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/// [fetch()]: https://developer.mozilla.org/en-US/docs/Web/API/fetch
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pub struct WasmAssetIo {
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root_path: PathBuf,
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}
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impl WasmAssetIo {
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/// Creates a new `WasmAssetIo`. The path provided will be used to build URLs to query for assets.
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pub fn new<P: AsRef<Path>>(path: P) -> Self {
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WasmAssetIo {
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root_path: path.as_ref().to_owned(),
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}
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}
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}
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impl AssetIo for WasmAssetIo {
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fn load_path<'a>(&'a self, path: &'a Path) -> BoxedFuture<'a, Result<Vec<u8>, AssetIoError>> {
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Box::pin(async move {
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let path = self.root_path.join(path);
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let window = web_sys::window().unwrap();
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let resp_value = JsFuture::from(window.fetch_with_str(path.to_str().unwrap()))
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.await
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.unwrap();
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let resp: Response = resp_value.dyn_into().unwrap();
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let data = JsFuture::from(resp.array_buffer().unwrap()).await.unwrap();
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let bytes = Uint8Array::new(&data).to_vec();
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Ok(bytes)
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})
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}
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fn read_directory(
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&self,
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_path: &Path,
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) -> Result<Box<dyn Iterator<Item = PathBuf>>, AssetIoError> {
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bevy_log::warn!("Loading folders is not supported in WASM");
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Ok(Box::new(std::iter::empty::<PathBuf>()))
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}
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fn watch_path_for_changes(&self, _path: &Path) -> Result<(), AssetIoError> {
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Ok(())
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}
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fn watch_for_changes(&self) -> Result<(), AssetIoError> {
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bevy_log::warn!("Watching for changes is not supported in WASM");
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Ok(())
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}
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fn get_metadata(&self, path: &Path) -> Result<Metadata, AssetIoError> {
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let full_path = self.root_path.join(path);
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full_path
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.metadata()
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.and_then(Metadata::try_from)
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.map_err(|e| {
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if e.kind() == std::io::ErrorKind::NotFound {
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AssetIoError::NotFound(full_path)
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} else {
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e.into()
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}
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})
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}
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}
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