Enable debug build.

examples/wasm-emscripten/.cargo/config.toml

@@ -9,4 +9,8 @@ target = "wasm32-unknown-emscripten"
 rustflags = [
     "-Clink-args=-fno-rtti -pthread -msimd128 -msse4.2 -sEXPORT_ALL -sSTACK_SIZE=5MB -sUSE_PTHREADS -sDEFAULT_PTHREAD_STACK_SIZE=2MB -sPTHREAD_POOL_SIZE=20 -sINITIAL_MEMORY=1GB -sEXPORT_ES6 --no-entry",
     "-Ctarget-feature=+atomics,+bulk-memory,+mutable-globals"
-]
+]
+
+# Debug build might benefit from further flags, but one cannot yet set debug-only rustflags.
+# See: https://github.com/rust-lang/cargo/issues/10271
+# -fexceptions, -gsource-map, -sASSERTIONS, -sNO_DISABLE_EXCEPTION_CATCHING

examples/wasm-emscripten/Cargo.toml

@@ -11,6 +11,6 @@ rust-embed = { version = "8", features = ["debug-embed"] } # Embed in debug to d
 image = "0.25"
 
 [build-dependencies]
-data_downloader = { version = "0.2", features = ["zip"] }
-hex-literal = "0.4"
-glob = "0.3"
+glob = "0.3"
+reqwest = { version = "0.12", features = ["blocking"] }
+zip = "2"

examples/wasm-emscripten/README.md

@@ -13,7 +13,7 @@ Environment tested on Ubuntu 24.04 and macOS 14.7.1.
 
 ## Build example
 1. Set local Emscripten SDK in current session via `source ./emsdk/emsdk_env.sh`.
-1. Build the example via `cargo build --release`.
+1. Build the example via `cargo build` for a debug build or `cargo build --release` for a release build.
 
 ## Serve example
-1. Serve the example via `python3 serve.py`. Pre-installed Python 3 should be sufficient.
+1. Serve a debug build via `python3 serve.py` or a release build via `python3 serve.py --release`. Pre-installed Python 3 should be sufficient.

examples/wasm-emscripten/build.rs

@@ -13,50 +13,60 @@ fn copy_dir_all(src: impl AsRef<std::path::Path>, dst: impl AsRef<std::path::Pat
 }
 
 fn main() {
+	use std::{
+		fs::{File, create_dir_all},
+		io::{Cursor, Read, Write}
+	};
+
+	use reqwest::blocking::get;
+	use zip::ZipArchive;
+
+	// Determine mode.
+	let mode = match cfg!(debug_assertions) {
+		true => "debug",
+		false => "release"
+	};
+
 	// Download precompiled libonnxruntime.a.
 	{
-		use std::{fs::File, io::Write};
+		// Request archive.
+		let mut request = get("https://github.com/alfatraining/onnxruntime-wasm-builds/releases/download/v1.20.1/libonnxruntime-v1.20.1-wasm.zip")
+			.expect("Cannot request precompiled onnxruntime.");
+		let mut buf = Vec::<u8>::new();
+		request.read_to_end(&mut buf).expect("Cannot read precompiled onnxruntime.");
 
-		use data_downloader::{DownloadRequest, InZipDownloadRequest, get};
+		// Prepare extraction.
+		let reader = Cursor::new(buf);
+		let mut zip = ZipArchive::new(reader).expect("Cannot incept unzipper.");
 
-		let request = InZipDownloadRequest {
-			parent: &DownloadRequest {
-				url: "https://github.com/alfatraining/onnxruntime-wasm-builds/releases/download/v1.20.1/libonnxruntime-v1.20.1-wasm.zip",
-				sha256_hash: &hex_literal::hex!("bf22b0bf1336babf116839fa58a257aa91112e9bb2dae7fcd4c4a4dee11b70af")
-			},
-			path: "Release/libonnxruntime.a",
-			sha256_hash: &hex_literal::hex!("abcf64d106168458d08905f97114f0289ebad0912ee96b92e8130670297b5c22")
-		};
-		let bytes = get(&request).expect("Cannot request libonnxruntime.a.");
-		let mut file = File::create("libonnxruntime.a").expect("Cannot create libonnxruntime.a.");
-		file.write_all(&bytes).expect("Cannot store libonnxruntime.a.");
+		// Extract precompiled library.
+		{
+			let mut buf = Vec::<u8>::new();
+			let mut mode_title_case = mode.to_string();
+			mode_title_case = format!("{}{mode_title_case}", mode_title_case.remove(0).to_uppercase());
+			zip.by_name(format!("{mode_title_case}/libonnxruntime.a").as_str())
+				.expect("Cannot find precompiled onnxruntime.")
+				.read_to_end(&mut buf)
+				.expect("Cannot read precompiled onnxruntime.");
+			File::create("./libonnxruntime.a")
+				.expect("Cannot create precompiled onnxruntime.")
+				.write_all(&buf)
+				.expect("Cannot store precompiled onnxruntime.");
+		}
 	}
 
 	// Download model.
 	{
-		use std::{
-			fs::{File, create_dir_all},
-			io::Write
-		};
-
-		use data_downloader::{DownloadRequest, get};
-
-		let request = DownloadRequest {
-			url: "https://parcel.pyke.io/v2/cdn/assetdelivery/ortrsv2/ex_models/yolov8m.onnx",
-			sha256_hash: &hex_literal::hex!("e91bd39ce15420f9623d5e3d46580f7ce4dfc85d061e4ee2e7b78ccd3e5b9453")
-		};
-		let bytes = get(&request).expect("Cannot request model.");
+		let mut request = get("https://parcel.pyke.io/v2/cdn/assetdelivery/ortrsv2/ex_models/yolov8m.onnx").expect("Cannot request model.");
+		let mut buf = Vec::<u8>::new();
+		request.read_to_end(&mut buf).expect("Cannot read model.");
 		create_dir_all("models").expect("Cannot create models directory.");
 		let mut file = File::create("models/yolov8m.onnx").expect("Cannot create model file.");
-		file.write_all(&bytes).expect("Cannot store model file.");
+		file.write_all(&buf).expect("Cannot store model.");
 	}
 
 	// Copy index.html and pictures to target directory.
 	{
-		let mode = match cfg!(debug_assertions) {
-			true => "debug",
-			false => "release"
-		};
 		println!("cargo:rerun-if-changed=index.html");
 		std::fs::copy("index.html", format!("../../target/wasm32-unknown-emscripten/{mode}/index.html")).expect("Cannot copy index.html.");
 

examples/wasm-emscripten/serve.py

@@ -1,5 +1,15 @@
 from http.server import HTTPServer, SimpleHTTPRequestHandler
 from os import chdir, path
+from argparse import ArgumentParser
+
+parser = ArgumentParser()
+parser.add_argument("-d", "--debug", action="store_true", help="serve debug build")
+parser.add_argument("-r", "--release", action="store_true", help="serve release build")
+args = parser.parse_args()
+if args.release:
+    mode = "release"
+else:
+    mode = "debug"
 
 # SharedArrayBuffer required for threaded execution need specific CORS headers.
 # See: https://rustwasm.github.io/wasm-bindgen/examples/raytrace.html#browser-requirements
@@ -11,8 +21,8 @@ def end_headers (self):
         self.send_header("Cross-Origin-Embedder-Policy", "require-corp")
         SimpleHTTPRequestHandler.end_headers(self)
 
-# Serve index.html from release build.
-chdir(path.join(path.dirname(__file__), "../../target/wasm32-unknown-emscripten/release"))
+# Serve index.html.
+chdir(path.join(path.dirname(__file__), f"../../target/wasm32-unknown-emscripten/{mode}"))
 httpd = HTTPServer(("localhost", 5555), CORSRequestHandler)
-print("Serving site at: http://localhost:5555")
+print(f"Serving {mode} build at: http://localhost:5555")
 httpd.serve_forever()