Change: C APIをwasmで使うようにする

Cargo.toml

@@ -94,9 +94,8 @@ rev = "ebb9dcb9b26ee681889b52b6db3b4f642b04a250"
 # git = "https://github.com/VOICEVOX/open_jtalk-rs.git"
 # rev = "70c76bb54522830e92803038191bf533ba68ce85"
 
-# https://github.com/White-Green/open_jtalk-rs/tree/support_wasm32-unknown-emscripten
-git = "https://github.com/White-Green/open_jtalk-rs.git"
-branch = "support_wasm32-unknown-emscripten"
+git = "https://github.com/sevenc-nanashi/open_jtalk-rs.git"
+branch = "add/wasm"
 
 # FIXME: iOS対応のpull request(https://github.com/wesleywiser/process_path/pull/16)がマージされる見込みが無いため
 [workspace.dependencies.process_path]

crates/voicevox_core_c_api/Cargo.toml

@@ -27,14 +27,16 @@ futures.workspace = true
 itertools.workspace = true
 libc.workspace = true
 once_cell.workspace = true
-process_path.workspace = true
 serde_json = { workspace = true, features = ["preserve_order"] }
 thiserror.workspace = true
 tracing.workspace = true
 tracing-subscriber = { workspace = true, features = ["env-filter"] }
 uuid.workspace = true
 voicevox_core.workspace = true
 
+[target."cfg(not(target_family = \"wasm\"))".dependencies]
+process_path.workspace = true
+
 [dev-dependencies]
 anyhow.workspace = true
 assert_cmd = { workspace = true, features = ["color-auto"] }
@@ -55,6 +57,9 @@ test_util.workspace = true
 toml.workspace = true
 typetag.workspace = true
 
+[target."cfg(target_family = \"wasm\")".build-dependencies]
+regex.workspace = true
+
 [lints.rust]
 unsafe_code = "allow" # C APIのための操作
 rust_2018_idioms = "warn"

crates/voicevox_core_c_api/build.rs

@@ -7,4 +7,52 @@ fn main() {
         println!("cargo:rustc-link-arg=-Wl,-rpath,@loader_path/");
         println!("cargo:rustc-link-arg=-Wl,-install_name,@rpath/libvoicevox_core.dylib");
     }
+
+    if std::env::var("TARGET").unwrap() == "wasm32-unknown-emscripten" {
+        // use regex::Regex;
+        // use std::fs;
+
+        // let lib_rs = fs::read_to_string("src/lib.rs").unwrap();
+        // let re = Regex::new(r#"pub (?:unsafe )?extern "C" fn (\w+)"#).unwrap();
+        // let mut functions = vec![];
+        // for cap in re.captures_iter(&lib_rs) {
+        //     functions.push(cap[1].to_string());
+        // }
+        // println!("cargo:rustc-link-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0");
+        // // TODO: WARNにしたいけど、これにするとemccがクラッシュする（どうして...）
+        // // println!("cargo:rustc-link-arg=-sWARN_ON_UNDEFINED_SYMBOLS=1");
+        // println!(
+        //     "cargo:rustc-link-arg=-sEXPORTED_FUNCTIONS=['{}']",
+        //     functions.join("','")
+        // );
+        // println!("cargo:rustc-link-arg=-sEXPORTED_RUNTIME_METHODS=['ccall']");
+        // println!("cargo:rustc-link-arg=-sEXPORT_NAME=\"RawVoicevoxCore\"");
+        // println!("cargo:rustc-link-arg=-sMODULARIZE=1");
+        // println!("cargo:rustc-link-arg=-sALLOW_MEMORY_GROWTH=1");
+        // println!("cargo:rustc-link-arg=-sTOTAL_STACK=128MB");
+        // println!("cargo:rustc-link-arg=-sINITIAL_MEMORY=256MB");
+        println!(
+            "cargo:rustc-link-arg=--js-library={}",
+            std::env::var("CARGO_MANIFEST_DIR").unwrap() + "/wasm_library.js"
+        );
+
+        println!("cargo:rustc-link-arg=-sEXPORTED_RUNTIME_METHODS=['ccall', 'FS']");
+        // println!("cargo:rustc-link-arg=--no-entry");
+        let out_dir = std::path::PathBuf::from(std::env::var("OUT_DIR").unwrap());
+        let target_dir = out_dir
+            .parent()
+            .unwrap()
+            .parent()
+            .unwrap()
+            .parent()
+            .unwrap();
+        println!(
+            "cargo:rustc-link-arg=-o{}/voicevox_core_wasm_api.mjs",
+            target_dir.display()
+        );
+        println!("cargo:rustc-link-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0");
+        println!("cargo:rustc-link-arg=-sEXPORT_NAME=VoicevoxCore");
+        println!("cargo:rustc-link-arg=-DEMSCRIPTEN_STANDALONE_WASM");
+        println!("cargo:rustc-link-arg=--no-entry");
+    }
 }

crates/voicevox_core_c_api/src/compatible_engine.rs

@@ -2,6 +2,7 @@ use std::{
     collections::BTreeMap,
     env,
     ffi::{c_char, CString},
+    path::PathBuf,
     sync::{Mutex, MutexGuard},
 };
 
@@ -64,15 +65,22 @@ static VOICE_MODEL_SET: Lazy<VoiceModelSet> = Lazy::new(|| {
     ///
     /// 失敗したらパニックする
     fn get_all_models() -> Vec<voicevox_core::blocking::VoiceModel> {
-        let root_dir = if let Some(root_dir) = env::var_os(ROOT_DIR_ENV_NAME) {
+        let root_dir: PathBuf = if let Some(root_dir) = env::var_os(ROOT_DIR_ENV_NAME) {
             root_dir.into()
         } else {
-            process_path::get_dylib_path()
-                .or_else(process_path::get_executable_path)
-                .unwrap()
-                .parent()
-                .unwrap_or_else(|| "".as_ref())
-                .join("model")
+            #[cfg(target_family = "wasm")]
+            {
+                unimplemented!()
+            }
+            #[cfg(not(target_family = "wasm"))]
+            {
+                process_path::get_dylib_path()
+                    .or_else(process_path::get_executable_path)
+                    .unwrap()
+                    .parent()
+                    .unwrap_or_else(|| "".as_ref())
+                    .join("model")
+            }
         };
 
         root_dir