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denoland-deno/ext/napi/lib.rs
2022-12-13 19:56:53 +05:30

616 lines
19 KiB
Rust

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
#![allow(non_camel_case_types)]
#![allow(non_upper_case_globals)]
#![allow(clippy::undocumented_unsafe_blocks)]
#![deny(clippy::missing_safety_doc)]
use core::ptr::NonNull;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::futures::channel::mpsc;
use deno_core::futures::StreamExt;
use deno_core::op;
use deno_core::serde_v8;
use deno_core::Extension;
use deno_core::OpState;
use std::cell::RefCell;
use std::ffi::CString;
use std::path::Path;
use std::path::PathBuf;
use std::task::Poll;
use std::thread_local;
#[cfg(unix)]
use libloading::os::unix::*;
#[cfg(windows)]
use libloading::os::windows::*;
// Expose common stuff for ease of use.
// `use deno_napi::*`
pub use deno_core::v8;
pub use std::ffi::CStr;
pub use std::mem::transmute;
pub use std::os::raw::c_char;
pub use std::os::raw::c_void;
pub use std::ptr;
pub use value::napi_value;
pub mod function;
mod value;
pub type napi_status = i32;
pub type napi_env = *mut c_void;
pub type napi_callback_info = *mut c_void;
pub type napi_deferred = *mut c_void;
pub type napi_ref = *mut c_void;
pub type napi_threadsafe_function = *mut c_void;
pub type napi_handle_scope = *mut c_void;
pub type napi_callback_scope = *mut c_void;
pub type napi_escapable_handle_scope = *mut c_void;
pub type napi_async_cleanup_hook_handle = *mut c_void;
pub type napi_async_work = *mut c_void;
pub const napi_ok: napi_status = 0;
pub const napi_invalid_arg: napi_status = 1;
pub const napi_object_expected: napi_status = 2;
pub const napi_string_expected: napi_status = 3;
pub const napi_name_expected: napi_status = 4;
pub const napi_function_expected: napi_status = 5;
pub const napi_number_expected: napi_status = 6;
pub const napi_boolean_expected: napi_status = 7;
pub const napi_array_expected: napi_status = 8;
pub const napi_generic_failure: napi_status = 9;
pub const napi_pending_exception: napi_status = 10;
pub const napi_cancelled: napi_status = 11;
pub const napi_escape_called_twice: napi_status = 12;
pub const napi_handle_scope_mismatch: napi_status = 13;
pub const napi_callback_scope_mismatch: napi_status = 14;
pub const napi_queue_full: napi_status = 15;
pub const napi_closing: napi_status = 16;
pub const napi_bigint_expected: napi_status = 17;
pub const napi_date_expected: napi_status = 18;
pub const napi_arraybuffer_expected: napi_status = 19;
pub const napi_detachable_arraybuffer_expected: napi_status = 20;
pub const napi_would_deadlock: napi_status = 21;
pub const NAPI_AUTO_LENGTH: usize = usize::MAX;
thread_local! {
pub static MODULE: RefCell<Option<*const NapiModule>> = RefCell::new(None);
pub static ASYNC_WORK_SENDER: RefCell<Option<mpsc::UnboundedSender<PendingNapiAsyncWork>>> = RefCell::new(None);
pub static THREAD_SAFE_FN_SENDER: RefCell<Option<mpsc::UnboundedSender<ThreadSafeFunctionStatus>>> = RefCell::new(None);
}
type napi_addon_register_func =
extern "C" fn(env: napi_env, exports: napi_value) -> napi_value;
#[repr(C)]
#[derive(Clone)]
pub struct NapiModule {
pub nm_version: i32,
pub nm_flags: u32,
nm_filename: *const c_char,
pub nm_register_func: napi_addon_register_func,
nm_modname: *const c_char,
nm_priv: *mut c_void,
reserved: [*mut c_void; 4],
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Error {
InvalidArg,
ObjectExpected,
StringExpected,
NameExpected,
FunctionExpected,
NumberExpected,
BooleanExpected,
ArrayExpected,
GenericFailure,
PendingException,
Cancelled,
EscapeCalledTwice,
HandleScopeMismatch,
CallbackScopeMismatch,
QueueFull,
Closing,
BigIntExpected,
DateExpected,
ArrayBufferExpected,
DetachableArraybufferExpected,
WouldDeadlock,
}
pub type Result = std::result::Result<(), Error>;
impl From<Error> for napi_status {
fn from(error: Error) -> Self {
match error {
Error::InvalidArg => napi_invalid_arg,
Error::ObjectExpected => napi_object_expected,
Error::StringExpected => napi_string_expected,
Error::NameExpected => napi_name_expected,
Error::FunctionExpected => napi_function_expected,
Error::NumberExpected => napi_number_expected,
Error::BooleanExpected => napi_boolean_expected,
Error::ArrayExpected => napi_array_expected,
Error::GenericFailure => napi_generic_failure,
Error::PendingException => napi_pending_exception,
Error::Cancelled => napi_cancelled,
Error::EscapeCalledTwice => napi_escape_called_twice,
Error::HandleScopeMismatch => napi_handle_scope_mismatch,
Error::CallbackScopeMismatch => napi_callback_scope_mismatch,
Error::QueueFull => napi_queue_full,
Error::Closing => napi_closing,
Error::BigIntExpected => napi_bigint_expected,
Error::DateExpected => napi_date_expected,
Error::ArrayBufferExpected => napi_arraybuffer_expected,
Error::DetachableArraybufferExpected => {
napi_detachable_arraybuffer_expected
}
Error::WouldDeadlock => napi_would_deadlock,
}
}
}
pub type napi_valuetype = i32;
pub const napi_undefined: napi_valuetype = 0;
pub const napi_null: napi_valuetype = 1;
pub const napi_boolean: napi_valuetype = 2;
pub const napi_number: napi_valuetype = 3;
pub const napi_string: napi_valuetype = 4;
pub const napi_symbol: napi_valuetype = 5;
pub const napi_object: napi_valuetype = 6;
pub const napi_function: napi_valuetype = 7;
pub const napi_external: napi_valuetype = 8;
pub const napi_bigint: napi_valuetype = 9;
pub type napi_threadsafe_function_release_mode = i32;
pub const napi_tsfn_release: napi_threadsafe_function_release_mode = 0;
pub const napi_tsfn_abortext: napi_threadsafe_function_release_mode = 1;
pub type napi_threadsafe_function_call_mode = i32;
pub const napi_tsfn_nonblocking: napi_threadsafe_function_call_mode = 0;
pub const napi_tsfn_blocking: napi_threadsafe_function_call_mode = 1;
pub type napi_key_collection_mode = i32;
pub const napi_key_include_prototypes: napi_key_collection_mode = 0;
pub const napi_key_own_only: napi_key_collection_mode = 1;
pub type napi_key_filter = i32;
pub const napi_key_all_properties: napi_key_filter = 0;
pub const napi_key_writable: napi_key_filter = 1;
pub const napi_key_enumerable: napi_key_filter = 1 << 1;
pub const napi_key_configurable: napi_key_filter = 1 << 2;
pub const napi_key_skip_strings: napi_key_filter = 1 << 3;
pub const napi_key_skip_symbols: napi_key_filter = 1 << 4;
pub type napi_key_conversion = i32;
pub const napi_key_keep_numbers: napi_key_conversion = 0;
pub const napi_key_numbers_to_strings: napi_key_conversion = 1;
pub type napi_typedarray_type = i32;
pub const napi_int8_array: napi_typedarray_type = 0;
pub const napi_uint8_array: napi_typedarray_type = 1;
pub const napi_uint8_clamped_array: napi_typedarray_type = 2;
pub const napi_int16_array: napi_typedarray_type = 3;
pub const napi_uint16_array: napi_typedarray_type = 4;
pub const napi_int32_array: napi_typedarray_type = 5;
pub const napi_uint32_array: napi_typedarray_type = 6;
pub const napi_float32_array: napi_typedarray_type = 7;
pub const napi_float64_array: napi_typedarray_type = 8;
pub const napi_bigint64_array: napi_typedarray_type = 9;
pub const napi_biguint64_array: napi_typedarray_type = 10;
pub struct napi_type_tag {
pub lower: u64,
pub upper: u64,
}
pub type napi_callback = Option<
unsafe extern "C" fn(
env: napi_env,
info: napi_callback_info,
) -> napi_value<'static>,
>;
pub type napi_finalize = unsafe extern "C" fn(
env: napi_env,
data: *mut c_void,
finalize_hint: *mut c_void,
);
pub type napi_async_execute_callback =
unsafe extern "C" fn(env: napi_env, data: *mut c_void);
pub type napi_async_complete_callback =
unsafe extern "C" fn(env: napi_env, status: napi_status, data: *mut c_void);
pub type napi_threadsafe_function_call_js = unsafe extern "C" fn(
env: napi_env,
js_callback: napi_value,
context: *mut c_void,
data: *mut c_void,
);
pub type napi_async_cleanup_hook =
unsafe extern "C" fn(env: napi_env, data: *mut c_void);
pub type napi_property_attributes = i32;
pub const napi_default: napi_property_attributes = 0;
pub const napi_writable: napi_property_attributes = 1 << 0;
pub const napi_enumerable: napi_property_attributes = 1 << 1;
pub const napi_configurable: napi_property_attributes = 1 << 2;
pub const napi_static: napi_property_attributes = 1 << 10;
pub const napi_default_method: napi_property_attributes =
napi_writable | napi_configurable;
pub const napi_default_jsproperty: napi_property_attributes =
napi_enumerable | napi_configurable | napi_writable;
#[repr(C)]
#[derive(Copy, Clone, Debug)]
pub struct napi_property_descriptor<'a> {
pub utf8name: *const c_char,
pub name: napi_value<'a>,
pub method: napi_callback,
pub getter: napi_callback,
pub setter: napi_callback,
pub value: napi_value<'a>,
pub attributes: napi_property_attributes,
pub data: *mut c_void,
}
#[repr(C)]
#[derive(Debug)]
pub struct napi_extended_error_info {
pub error_message: *const c_char,
pub engine_reserved: *mut c_void,
pub engine_error_code: i32,
pub status_code: napi_status,
}
#[repr(C)]
#[derive(Debug)]
pub struct napi_node_version {
pub major: u32,
pub minor: u32,
pub patch: u32,
pub release: *const c_char,
}
pub type PendingNapiAsyncWork = Box<dyn FnOnce()>;
pub struct NapiState {
// Async tasks.
pub pending_async_work: Vec<PendingNapiAsyncWork>,
pub async_work_sender: mpsc::UnboundedSender<PendingNapiAsyncWork>,
pub async_work_receiver: mpsc::UnboundedReceiver<PendingNapiAsyncWork>,
// Thread safe functions.
pub active_threadsafe_functions: usize,
pub threadsafe_function_receiver:
mpsc::UnboundedReceiver<ThreadSafeFunctionStatus>,
pub threadsafe_function_sender:
mpsc::UnboundedSender<ThreadSafeFunctionStatus>,
}
#[repr(C)]
#[derive(Debug)]
/// Env that is shared between all contexts in same native module.
pub struct EnvShared {
pub instance_data: *mut c_void,
pub data_finalize: Option<napi_finalize>,
pub data_finalize_hint: *mut c_void,
pub napi_wrap: v8::Global<v8::Private>,
pub finalize: Option<napi_finalize>,
pub finalize_hint: *mut c_void,
pub filename: *const c_char,
}
impl EnvShared {
pub fn new(napi_wrap: v8::Global<v8::Private>) -> Self {
Self {
instance_data: std::ptr::null_mut(),
data_finalize: None,
data_finalize_hint: std::ptr::null_mut(),
napi_wrap,
finalize: None,
finalize_hint: std::ptr::null_mut(),
filename: std::ptr::null(),
}
}
}
pub enum ThreadSafeFunctionStatus {
Alive,
Dead,
}
#[repr(C)]
pub struct Env {
context: NonNull<v8::Context>,
pub isolate_ptr: *mut v8::OwnedIsolate,
pub open_handle_scopes: usize,
pub shared: *mut EnvShared,
pub async_work_sender: mpsc::UnboundedSender<PendingNapiAsyncWork>,
pub threadsafe_function_sender:
mpsc::UnboundedSender<ThreadSafeFunctionStatus>,
}
unsafe impl Send for Env {}
unsafe impl Sync for Env {}
impl Env {
pub fn new(
isolate_ptr: *mut v8::OwnedIsolate,
context: v8::Global<v8::Context>,
sender: mpsc::UnboundedSender<PendingNapiAsyncWork>,
threadsafe_function_sender: mpsc::UnboundedSender<ThreadSafeFunctionStatus>,
) -> Self {
let sc = sender.clone();
ASYNC_WORK_SENDER.with(|s| {
s.replace(Some(sc));
});
let ts = threadsafe_function_sender.clone();
THREAD_SAFE_FN_SENDER.with(|s| {
s.replace(Some(ts));
});
Self {
isolate_ptr,
context: context.into_raw(),
shared: std::ptr::null_mut(),
open_handle_scopes: 0,
async_work_sender: sender,
threadsafe_function_sender,
}
}
pub fn shared(&self) -> &EnvShared {
// SAFETY: the lifetime of `EnvShared` always exceeds the lifetime of `Env`.
unsafe { &*self.shared }
}
pub fn shared_mut(&mut self) -> &mut EnvShared {
// SAFETY: the lifetime of `EnvShared` always exceeds the lifetime of `Env`.
unsafe { &mut *self.shared }
}
pub fn add_async_work(&mut self, async_work: PendingNapiAsyncWork) {
self.async_work_sender.unbounded_send(async_work).unwrap();
}
#[inline]
pub fn isolate(&mut self) -> &mut v8::OwnedIsolate {
// SAFETY: Lifetime of `OwnedIsolate` is longer than `Env`.
unsafe { &mut *self.isolate_ptr }
}
#[inline]
pub fn scope(&self) -> v8::CallbackScope {
// SAFETY: `v8::Local` is always non-null pointer; the `HandleScope` is
// already on the stack, but we don't have access to it.
let context = unsafe {
transmute::<NonNull<v8::Context>, v8::Local<v8::Context>>(self.context)
};
// SAFETY: there must be a `HandleScope` on the stack, this is ensured because
// we are in a V8 callback or the module has already opened a `HandleScope`
// using `napi_open_handle_scope`.
unsafe { v8::CallbackScope::new(context) }
}
}
pub fn init<P: NapiPermissions + 'static>(unstable: bool) -> Extension {
Extension::builder()
.ops(vec![op_napi_open::decl::<P>()])
.event_loop_middleware(|op_state_rc, cx| {
// `work` can call back into the runtime. It can also schedule an async task
// but we don't know that now. We need to make the runtime re-poll to make
// sure no pending NAPI tasks exist.
let mut maybe_scheduling = false;
{
let mut op_state = op_state_rc.borrow_mut();
let napi_state = op_state.borrow_mut::<NapiState>();
while let Poll::Ready(Some(async_work_fut)) =
napi_state.async_work_receiver.poll_next_unpin(cx)
{
napi_state.pending_async_work.push(async_work_fut);
}
while let Poll::Ready(Some(tsfn_status)) =
napi_state.threadsafe_function_receiver.poll_next_unpin(cx)
{
match tsfn_status {
ThreadSafeFunctionStatus::Alive => {
napi_state.active_threadsafe_functions += 1
}
ThreadSafeFunctionStatus::Dead => {
napi_state.active_threadsafe_functions -= 1
}
};
}
if napi_state.active_threadsafe_functions > 0 {
maybe_scheduling = true;
}
}
loop {
let maybe_work = {
let mut op_state = op_state_rc.borrow_mut();
let napi_state = op_state.borrow_mut::<NapiState>();
napi_state.pending_async_work.pop()
};
if let Some(work) = maybe_work {
work();
maybe_scheduling = true;
} else {
break;
}
}
maybe_scheduling
})
.state(move |state| {
let (async_work_sender, async_work_receiver) =
mpsc::unbounded::<PendingNapiAsyncWork>();
let (threadsafe_function_sender, threadsafe_function_receiver) =
mpsc::unbounded::<ThreadSafeFunctionStatus>();
state.put(NapiState {
pending_async_work: Vec::new(),
async_work_sender,
async_work_receiver,
threadsafe_function_sender,
threadsafe_function_receiver,
active_threadsafe_functions: 0,
});
state.put(Unstable(unstable));
Ok(())
})
.build()
}
pub trait NapiPermissions {
fn check(&mut self, path: Option<&Path>)
-> std::result::Result<(), AnyError>;
}
pub struct Unstable(pub bool);
fn check_unstable(state: &OpState) {
let unstable = state.borrow::<Unstable>();
if !unstable.0 {
eprintln!("Unstable API 'node-api'. The --unstable flag must be provided.");
std::process::exit(70);
}
}
#[op(v8)]
fn op_napi_open<NP, 'scope>(
scope: &mut v8::HandleScope<'scope>,
op_state: &mut OpState,
path: String,
) -> std::result::Result<serde_v8::Value<'scope>, AnyError>
where
NP: NapiPermissions + 'static,
{
check_unstable(op_state);
let permissions = op_state.borrow_mut::<NP>();
permissions.check(Some(&PathBuf::from(&path)))?;
let (async_work_sender, tsfn_sender, isolate_ptr) = {
let napi_state = op_state.borrow::<NapiState>();
let isolate_ptr = op_state.borrow::<*mut v8::OwnedIsolate>();
(
napi_state.async_work_sender.clone(),
napi_state.threadsafe_function_sender.clone(),
*isolate_ptr,
)
};
let napi_wrap_name = v8::String::new(scope, "napi_wrap").unwrap();
let napi_wrap = v8::Private::new(scope, Some(napi_wrap_name));
let napi_wrap = v8::Global::new(scope, napi_wrap);
// The `module.exports` object.
let exports = v8::Object::new(scope);
let mut env_shared = EnvShared::new(napi_wrap);
let cstr = CString::new(path.clone()).unwrap();
env_shared.filename = cstr.as_ptr();
std::mem::forget(cstr);
let ctx = scope.get_current_context();
let mut env = Env::new(
isolate_ptr,
v8::Global::new(scope, ctx),
async_work_sender,
tsfn_sender,
);
env.shared = Box::into_raw(Box::new(env_shared));
let env_ptr = Box::into_raw(Box::new(env)) as _;
#[cfg(unix)]
let flags = RTLD_LAZY;
#[cfg(not(unix))]
let flags = 0x00000008;
// SAFETY: opening a DLL calls dlopen
#[cfg(unix)]
let library = match unsafe { Library::open(Some(&path), flags) } {
Ok(lib) => lib,
Err(e) => return Err(type_error(e.to_string())),
};
// SAFETY: opening a DLL calls dlopen
#[cfg(not(unix))]
let library = match unsafe { Library::load_with_flags(&path, flags) } {
Ok(lib) => lib,
Err(e) => return Err(type_error(e.to_string())),
};
MODULE.with(|cell| {
let slot = *cell.borrow();
let obj = match slot {
Some(nm) => {
// SAFETY: napi_register_module guarantees that `nm` is valid.
let nm = unsafe { &*nm };
assert_eq!(nm.nm_version, 1);
// SAFETY: we are going blind, calling the register function on the other side.
let exports = unsafe {
(nm.nm_register_func)(
env_ptr,
std::mem::transmute::<v8::Local<v8::Value>, napi_value>(
exports.into(),
),
)
};
// SAFETY: v8::Local is a pointer to a value and napi_value is also a pointer
// to a value, they have the same layout
let exports = unsafe {
std::mem::transmute::<napi_value, v8::Local<v8::Value>>(exports)
};
Ok(serde_v8::Value { v8_value: exports })
}
None => {
// Initializer callback.
// SAFETY: we are going blind, calling the register function on the other side.
unsafe {
let init = library
.get::<unsafe extern "C" fn(
env: napi_env,
exports: napi_value,
) -> napi_value>(b"napi_register_module_v1")
.expect("napi_register_module_v1 not found");
init(
env_ptr,
std::mem::transmute::<v8::Local<v8::Value>, napi_value>(
exports.into(),
),
)
};
Ok(serde_v8::Value {
v8_value: exports.into(),
})
}
};
// NAPI addons can't be unloaded, so we're going to "forget" the library
// object so it lives till the program exit.
std::mem::forget(library);
obj
})
}