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module_register.rs
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module_register.rs
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use std::collections::{HashMap, HashSet};
use std::ffi::{c_void, CStr};
use std::ptr;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::{AtomicBool, AtomicPtr, Ordering};
use std::thread::ThreadId;
use once_cell::sync::Lazy;
use crate::{
check_status, check_status_or_throw, sys, Env, JsError, JsFunction, Property, Result, Value,
ValueType,
};
pub type ExportRegisterCallback = unsafe fn(sys::napi_env) -> Result<sys::napi_value>;
pub type ModuleExportsCallback =
unsafe fn(env: sys::napi_env, exports: sys::napi_value) -> Result<()>;
struct PersistedPerInstanceVec<T> {
inner: AtomicPtr<T>,
length: AtomicUsize,
}
impl<T> Drop for PersistedPerInstanceVec<T> {
fn drop(&mut self) {
let length = self.length.load(Ordering::Relaxed);
if length == 0 {
return;
}
let inner = self.inner.load(Ordering::Relaxed);
unsafe { Vec::from_raw_parts(inner, length, length) };
}
}
impl<T> Default for PersistedPerInstanceVec<T> {
fn default() -> Self {
let mut vec: Vec<T> = Vec::with_capacity(1);
let ret = Self {
inner: AtomicPtr::new(vec.as_mut_ptr()),
length: AtomicUsize::new(0),
};
std::mem::forget(vec);
ret
}
}
impl<T> PersistedPerInstanceVec<T> {
#[allow(clippy::mut_from_ref)]
fn borrow_mut<F>(&self, f: F)
where
F: FnOnce(&mut [T]),
{
let length = self.length.load(Ordering::Relaxed);
if length == 0 {
f(&mut []);
} else {
let inner = self.inner.load(Ordering::Relaxed);
let mut temp = unsafe { Vec::from_raw_parts(inner, length, length) };
f(temp.as_mut_slice());
// Inner Vec has been reallocated, so we need to update the pointer
if temp.as_mut_ptr() != inner {
self.inner.store(temp.as_mut_ptr(), Ordering::Relaxed);
}
self.length.store(temp.len(), Ordering::Relaxed);
std::mem::forget(temp);
}
}
fn push(&self, item: T) {
let length = self.length.load(Ordering::Relaxed);
let inner = self.inner.load(Ordering::Relaxed);
let mut temp = unsafe { Vec::from_raw_parts(inner, length, length) };
temp.push(item);
// Inner Vec has been reallocated, so we need to update the pointer
if temp.as_mut_ptr() != inner {
self.inner.store(temp.as_mut_ptr(), Ordering::Relaxed);
}
std::mem::forget(temp);
self.length.fetch_add(1, Ordering::Relaxed);
}
}
unsafe impl<T: Send> Send for PersistedPerInstanceVec<T> {}
unsafe impl<T: Sync> Sync for PersistedPerInstanceVec<T> {}
pub(crate) struct PersistedPerInstanceHashMap<K, V>(*mut HashMap<K, V>);
impl<K, V> Drop for PersistedPerInstanceHashMap<K, V> {
fn drop(&mut self) {
unsafe { Box::from_raw(self.0) };
}
}
impl<K, V> PersistedPerInstanceHashMap<K, V> {
pub(crate) fn from_hashmap(hashmap: HashMap<K, V>) -> Self {
Self(Box::into_raw(Box::new(hashmap)))
}
#[allow(clippy::mut_from_ref)]
pub(crate) fn borrow_mut<F, R>(&self, f: F) -> R
where
F: FnOnce(&mut HashMap<K, V>) -> R,
{
f(unsafe { Box::leak(Box::from_raw(self.0)) })
}
}
impl<K, V> Default for PersistedPerInstanceHashMap<K, V> {
fn default() -> Self {
let map = Default::default();
Self(Box::into_raw(Box::new(map)))
}
}
type ModuleRegisterCallback =
PersistedPerInstanceVec<(Option<&'static str>, (&'static str, ExportRegisterCallback))>;
type ModuleClassProperty = PersistedPerInstanceHashMap<
&'static str,
HashMap<Option<&'static str>, (&'static str, Vec<Property>)>,
>;
unsafe impl<K, V> Send for PersistedPerInstanceHashMap<K, V> {}
unsafe impl<K, V> Sync for PersistedPerInstanceHashMap<K, V> {}
type FnRegisterMap =
PersistedPerInstanceHashMap<ExportRegisterCallback, (sys::napi_callback, &'static str)>;
type RegisteredClassesMap = PersistedPerInstanceHashMap<ThreadId, RegisteredClasses>;
static MODULE_REGISTER_CALLBACK: Lazy<ModuleRegisterCallback> = Lazy::new(Default::default);
static MODULE_CLASS_PROPERTIES: Lazy<ModuleClassProperty> = Lazy::new(Default::default);
static REGISTERED: AtomicBool = AtomicBool::new(false);
static REGISTERED_CLASSES: Lazy<RegisteredClassesMap> = Lazy::new(Default::default);
static FN_REGISTER_MAP: Lazy<FnRegisterMap> = Lazy::new(Default::default);
#[ctor::dtor]
fn destroy() {
{
let ptr = MODULE_REGISTER_CALLBACK.inner.load(Ordering::Relaxed);
let len = MODULE_REGISTER_CALLBACK.length.load(Ordering::Relaxed);
unsafe { Vec::from_raw_parts(ptr, len, len) };
}
{
unsafe { Box::from_raw(MODULE_CLASS_PROPERTIES.0) };
}
{
unsafe { Box::from_raw(FN_REGISTER_MAP.0) };
}
}
#[inline]
fn wait_first_thread_registered() {
while !REGISTERED.load(Ordering::SeqCst) {
std::hint::spin_loop();
}
}
type RegisteredClasses =
PersistedPerInstanceHashMap</* export name */ String, /* constructor */ sys::napi_ref>;
#[cfg(feature = "compat-mode")]
// compatibility for #[module_exports]
static MODULE_EXPORTS: Lazy<PersistedPerInstanceVec<ModuleExportsCallback>> =
Lazy::new(Default::default);
#[doc(hidden)]
pub fn get_class_constructor(js_name: &'static str) -> Option<sys::napi_ref> {
wait_first_thread_registered();
let current_id = std::thread::current().id();
REGISTERED_CLASSES.borrow_mut(|map| {
map
.get(¤t_id)
.map(|m| m.borrow_mut(|map| map.get(js_name).copied()))
})?
}
#[doc(hidden)]
#[cfg(feature = "compat-mode")]
// compatibility for #[module_exports]
pub fn register_module_exports(callback: ModuleExportsCallback) {
MODULE_EXPORTS.push(callback);
}
#[doc(hidden)]
pub fn register_module_export(
js_mod: Option<&'static str>,
name: &'static str,
cb: ExportRegisterCallback,
) {
MODULE_REGISTER_CALLBACK.push((js_mod, (name, cb)));
}
#[doc(hidden)]
pub fn register_js_function(
name: &'static str,
cb: ExportRegisterCallback,
c_fn: sys::napi_callback,
) {
FN_REGISTER_MAP.borrow_mut(|inner| {
inner.insert(cb, (c_fn, name));
});
}
#[doc(hidden)]
pub fn register_class(
rust_name: &'static str,
js_mod: Option<&'static str>,
js_name: &'static str,
props: Vec<Property>,
) {
MODULE_CLASS_PROPERTIES.borrow_mut(|inner| {
let val = inner.entry(rust_name).or_default();
let val = val.entry(js_mod).or_default();
val.0 = js_name;
val.1.extend(props.into_iter());
});
}
#[inline]
/// Get `JsFunction` from defined Rust `fn`
/// ```rust
/// #[napi]
/// fn some_fn() -> u32 {
/// 1
/// }
///
/// #[napi]
/// fn return_some_fn() -> Result<JsFunction> {
/// get_js_function(some_fn_js_function)
/// }
/// ```
///
/// ```js
/// returnSomeFn()(); // 1
/// ```
///
pub fn get_js_function(env: &Env, raw_fn: ExportRegisterCallback) -> Result<JsFunction> {
wait_first_thread_registered();
FN_REGISTER_MAP.borrow_mut(|inner| {
inner
.get(&raw_fn)
.and_then(|(cb, name)| {
let mut function = ptr::null_mut();
let name_len = name.len() - 1;
let fn_name = unsafe { CStr::from_bytes_with_nul_unchecked(name.as_bytes()) };
check_status!(unsafe {
sys::napi_create_function(
env.0,
fn_name.as_ptr(),
name_len,
*cb,
ptr::null_mut(),
&mut function,
)
})
.ok()?;
Some(JsFunction(Value {
env: env.0,
value: function,
value_type: ValueType::Function,
}))
})
.ok_or_else(|| {
crate::Error::new(
crate::Status::InvalidArg,
"JavaScript function does not exist".to_owned(),
)
})
})
}
/// Get `C Callback` from defined Rust `fn`
/// ```rust
/// #[napi]
/// fn some_fn() -> u32 {
/// 1
/// }
///
/// #[napi]
/// fn create_obj(env: Env) -> Result<JsObject> {
/// let mut obj = env.create_object()?;
/// obj.define_property(&[Property::new("getter")?.with_getter(get_c_callback(some_fn_js_function)?)])?;
/// Ok(obj)
/// }
/// ```
///
/// ```js
/// console.log(createObj().getter) // 1
/// ```
///
pub fn get_c_callback(raw_fn: ExportRegisterCallback) -> Result<crate::Callback> {
wait_first_thread_registered();
FN_REGISTER_MAP.borrow_mut(|inner| {
inner
.get(&raw_fn)
.and_then(|(cb, _name)| *cb)
.ok_or_else(|| {
crate::Error::new(
crate::Status::InvalidArg,
"JavaScript function does not exist".to_owned(),
)
})
})
}
#[cfg(windows)]
#[ctor::ctor]
fn load_host() {
unsafe {
sys::setup();
}
}
#[no_mangle]
unsafe extern "C" fn napi_register_module_v1(
env: sys::napi_env,
exports: sys::napi_value,
) -> sys::napi_value {
crate::__private::___CALL_FROM_FACTORY.get_or_default();
let mut exports_objects: HashSet<String> = HashSet::default();
MODULE_REGISTER_CALLBACK.borrow_mut(|inner| {
inner
.iter_mut()
.fold(
HashMap::<Option<&'static str>, Vec<(&'static str, ExportRegisterCallback)>>::new(),
|mut acc, (js_mod, item)| {
if let Some(k) = acc.get_mut(js_mod) {
k.push(*item);
} else {
acc.insert(*js_mod, vec![*item]);
}
acc
},
)
.iter()
.for_each(|(js_mod, items)| {
let mut exports_js_mod = ptr::null_mut();
if let Some(js_mod_str) = js_mod {
let mod_name_c_str =
unsafe { CStr::from_bytes_with_nul_unchecked(js_mod_str.as_bytes()) };
if exports_objects.contains(*js_mod_str) {
check_status_or_throw!(
env,
unsafe {
sys::napi_get_named_property(
env,
exports,
mod_name_c_str.as_ptr(),
&mut exports_js_mod,
)
},
"Get mod {} from exports failed",
js_mod_str,
);
} else {
check_status_or_throw!(
env,
unsafe { sys::napi_create_object(env, &mut exports_js_mod) },
"Create export JavaScript Object [{}] failed",
js_mod_str
);
check_status_or_throw!(
env,
unsafe {
sys::napi_set_named_property(env, exports, mod_name_c_str.as_ptr(), exports_js_mod)
},
"Set exports Object [{}] into exports object failed",
js_mod_str
);
exports_objects.insert(js_mod_str.to_string());
}
}
for (name, callback) in items {
unsafe {
let js_name = CStr::from_bytes_with_nul_unchecked(name.as_bytes());
if let Err(e) = callback(env).and_then(|v| {
let exported_object = if exports_js_mod.is_null() {
exports
} else {
exports_js_mod
};
check_status!(
sys::napi_set_named_property(env, exported_object, js_name.as_ptr(), v),
"Failed to register export `{}`",
name,
)
}) {
JsError::from(e).throw_into(env)
}
}
}
})
});
let mut registered_classes =
HashMap::with_capacity(MODULE_CLASS_PROPERTIES.borrow_mut(|inner| inner.len()));
MODULE_CLASS_PROPERTIES.borrow_mut(|inner| {
inner.iter().for_each(|(rust_name, js_mods)| {
for (js_mod, (js_name, props)) in js_mods {
let mut exports_js_mod = ptr::null_mut();
unsafe {
if let Some(js_mod_str) = js_mod {
let mod_name_c_str = CStr::from_bytes_with_nul_unchecked(js_mod_str.as_bytes());
if exports_objects.contains(*js_mod_str) {
check_status_or_throw!(
env,
sys::napi_get_named_property(
env,
exports,
mod_name_c_str.as_ptr(),
&mut exports_js_mod,
),
"Get mod {} from exports failed",
js_mod_str,
);
} else {
check_status_or_throw!(
env,
sys::napi_create_object(env, &mut exports_js_mod),
"Create export JavaScript Object [{}] failed",
js_mod_str
);
check_status_or_throw!(
env,
sys::napi_set_named_property(env, exports, mod_name_c_str.as_ptr(), exports_js_mod),
"Set exports Object [{}] into exports object failed",
js_mod_str
);
exports_objects.insert(js_mod_str.to_string());
}
}
let (ctor, props): (Vec<_>, Vec<_>) = props.iter().partition(|prop| prop.is_ctor);
let ctor = ctor.get(0).map(|c| c.raw().method.unwrap()).unwrap_or(noop);
let raw_props: Vec<_> = props.iter().map(|prop| prop.raw()).collect();
let js_class_name = CStr::from_bytes_with_nul_unchecked(js_name.as_bytes());
let mut class_ptr = ptr::null_mut();
check_status_or_throw!(
env,
sys::napi_define_class(
env,
js_class_name.as_ptr(),
js_name.len() - 1,
Some(ctor),
ptr::null_mut(),
raw_props.len(),
raw_props.as_ptr(),
&mut class_ptr,
),
"Failed to register class `{}` generate by struct `{}`",
&js_name,
&rust_name
);
let mut ctor_ref = ptr::null_mut();
sys::napi_create_reference(env, class_ptr, 1, &mut ctor_ref);
registered_classes.insert(js_name.to_string(), ctor_ref);
check_status_or_throw!(
env,
sys::napi_set_named_property(
env,
if exports_js_mod.is_null() {
exports
} else {
exports_js_mod
},
js_class_name.as_ptr(),
class_ptr
),
"Failed to register class `{}` generate by struct `{}`",
&js_name,
&rust_name
);
}
}
});
REGISTERED_CLASSES.borrow_mut(|map| {
map.insert(
std::thread::current().id(),
PersistedPerInstanceHashMap::from_hashmap(registered_classes),
)
});
});
#[cfg(feature = "compat-mode")]
MODULE_EXPORTS.borrow_mut(|inner| {
inner.iter().for_each(|callback| unsafe {
if let Err(e) = callback(env, exports) {
JsError::from(e).throw_into(env);
}
})
});
#[cfg(feature = "napi3")]
{
unsafe {
sys::napi_add_env_cleanup_hook(env, Some(remove_registered_classes), env as *mut c_void)
};
}
REGISTERED.store(true, Ordering::SeqCst);
exports
}
unsafe extern "C" fn remove_registered_classes(env: *mut c_void) {
let env = env as sys::napi_env;
if let Some(registered_classes) =
REGISTERED_CLASSES.borrow_mut(|map| map.remove(&std::thread::current().id()))
{
registered_classes.borrow_mut(|map| {
map.iter().for_each(|(_, v)| {
unsafe { sys::napi_delete_reference(env, *v) };
})
});
}
}
pub(crate) unsafe extern "C" fn noop(
env: sys::napi_env,
_info: sys::napi_callback_info,
) -> sys::napi_value {
let inner = crate::bindgen_runtime::___CALL_FROM_FACTORY.get_or_default();
if !inner.load(Ordering::Relaxed) {
unsafe {
sys::napi_throw_error(
env,
ptr::null_mut(),
CStr::from_bytes_with_nul_unchecked(b"Class contains no `constructor`, can not new it!\0")
.as_ptr(),
);
}
}
ptr::null_mut()
}