use crate::StartSnapshot;
use crate::colors;
use crate::inspector_server::InspectorServer;
use crate::js;
use crate::ops;
use crate::ops::io::Stdio;
use crate::permissions::Permissions;
use crate::tokio_util::run_basic;
use crate::worker::FormatJsErrorFn;
use crate::BootstrapOptions;
use deno_broadcast_channel::InMemoryBroadcastChannel;
use deno_core::error::AnyError;
use deno_core::error::JsError;
use deno_core::futures::channel::mpsc;
use deno_core::futures::future::poll_fn;
use deno_core::futures::stream::StreamExt;
use deno_core::futures::task::AtomicWaker;
use deno_core::located_script_name;
use deno_core::serde::Deserialize;
use deno_core::serde::Serialize;
use deno_core::serde_json::json;
use deno_core::v8;
use deno_core::CancelHandle;
use deno_core::CompiledWasmModuleStore;
use deno_core::Extension;
use deno_core::GetErrorClassFn;
use deno_core::JsRuntime;
use deno_core::ModuleId;
use deno_core::ModuleLoader;
use deno_core::ModuleSpecifier;
use deno_core::RuntimeOptions;
use deno_core::SharedArrayBufferStore;
use deno_tls::rustls::RootCertStore;
use deno_web::create_entangled_message_port;
use deno_web::BlobStore;
use deno_web::MessagePort;
use derive_builder::Builder;
use log::debug;
use std::cell::RefCell;
use std::fmt;
use std::rc::Rc;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering;
use std::sync::Arc;
use std::task::Context;
use std::task::Poll;
#[derive(Debug, Copy, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum WebWorkerType {
Classic,
Module,
}
#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct WorkerId(u32);
impl fmt::Display for WorkerId {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "worker-{}", self.0)
}
}
impl WorkerId {
pub fn next(&self) -> Option<WorkerId> {
self.0.checked_add(1).map(WorkerId)
}
}
pub enum WorkerControlEvent {
Error(AnyError),
TerminalError(AnyError),
Close,
}
use deno_core::serde::Serializer;
impl Serialize for WorkerControlEvent {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let type_id = match &self {
WorkerControlEvent::TerminalError(_) => 1_i32,
WorkerControlEvent::Error(_) => 2_i32,
WorkerControlEvent::Close => 3_i32,
};
match self {
WorkerControlEvent::TerminalError(error) | WorkerControlEvent::Error(error) => {
let value = match error.downcast_ref::<JsError>() {
Some(js_error) => {
let frame = js_error.frames.first();
json!({
"message": js_error.exception_message,
"fileName": frame.map(|f| f.file_name.as_ref()),
"lineNumber": frame.map(|f| f.line_number.as_ref()),
"columnNumber": frame.map(|f| f.column_number.as_ref()),
})
}
None => json!({
"message": error.to_string(),
}),
};
Serialize::serialize(&(type_id, value), serializer)
}
_ => Serialize::serialize(&(type_id, ()), serializer),
}
}
}
#[derive(Clone)]
pub struct WebWorkerInternalHandle {
sender: mpsc::Sender<WorkerControlEvent>,
pub port: Rc<MessagePort>,
pub cancel: Rc<CancelHandle>,
termination_signal: Arc<AtomicBool>,
has_terminated: Arc<AtomicBool>,
terminate_waker: Arc<AtomicWaker>,
isolate_handle: v8::IsolateHandle,
pub name: String,
pub worker_type: WebWorkerType,
}
impl WebWorkerInternalHandle {
pub fn post_event(&self, event: WorkerControlEvent) -> Result<(), AnyError> {
let mut sender = self.sender.clone();
if sender.is_closed() {
self.has_terminated.store(true, Ordering::SeqCst);
return Ok(());
}
sender.try_send(event)?;
Ok(())
}
pub fn is_terminated(&self) -> bool {
self.has_terminated.load(Ordering::SeqCst)
}
pub fn terminate_if_needed(&mut self) -> bool {
let has_terminated = self.is_terminated();
if !has_terminated && self.termination_signal.load(Ordering::SeqCst) {
self.terminate();
return true;
}
has_terminated
}
pub fn terminate(&mut self) {
self.cancel.cancel();
let already_terminated = self.has_terminated.swap(true, Ordering::SeqCst);
if !already_terminated {
self.isolate_handle.terminate_execution();
}
self.sender.close_channel();
}
}
pub struct SendableWebWorkerHandle {
port: MessagePort,
receiver: mpsc::Receiver<WorkerControlEvent>,
termination_signal: Arc<AtomicBool>,
has_terminated: Arc<AtomicBool>,
terminate_waker: Arc<AtomicWaker>,
isolate_handle: v8::IsolateHandle,
}
impl From<SendableWebWorkerHandle> for WebWorkerHandle {
fn from(handle: SendableWebWorkerHandle) -> Self {
WebWorkerHandle {
receiver: Rc::new(RefCell::new(handle.receiver)),
port: Rc::new(handle.port),
termination_signal: handle.termination_signal,
has_terminated: handle.has_terminated,
terminate_waker: handle.terminate_waker,
isolate_handle: handle.isolate_handle,
}
}
}
#[derive(Clone)]
pub struct WebWorkerHandle {
pub port: Rc<MessagePort>,
receiver: Rc<RefCell<mpsc::Receiver<WorkerControlEvent>>>,
termination_signal: Arc<AtomicBool>,
has_terminated: Arc<AtomicBool>,
terminate_waker: Arc<AtomicWaker>,
isolate_handle: v8::IsolateHandle,
}
impl WebWorkerHandle {
pub async fn get_control_event(&self) -> Result<Option<WorkerControlEvent>, AnyError> {
#![allow(clippy::await_holding_refcell_ref)] let mut receiver = self.receiver.borrow_mut();
Ok(receiver.next().await)
}
pub fn terminate(self) {
use std::thread::{sleep, spawn};
use std::time::Duration;
let schedule_termination = !self.termination_signal.swap(true, Ordering::SeqCst);
self.port.disentangle();
if schedule_termination && !self.has_terminated.load(Ordering::SeqCst) {
self.terminate_waker.wake();
let has_terminated = self.has_terminated.clone();
spawn(move || {
sleep(Duration::from_secs(2));
let already_terminated = has_terminated.swap(true, Ordering::SeqCst);
if !already_terminated {
self.isolate_handle.terminate_execution();
}
});
}
}
}
fn create_handles(
isolate_handle: v8::IsolateHandle,
name: String,
worker_type: WebWorkerType,
) -> (WebWorkerInternalHandle, SendableWebWorkerHandle) {
let (parent_port, worker_port) = create_entangled_message_port();
let (ctrl_tx, ctrl_rx) = mpsc::channel::<WorkerControlEvent>(1);
let termination_signal = Arc::new(AtomicBool::new(false));
let has_terminated = Arc::new(AtomicBool::new(false));
let terminate_waker = Arc::new(AtomicWaker::new());
let internal_handle = WebWorkerInternalHandle {
name,
port: Rc::new(parent_port),
termination_signal: termination_signal.clone(),
has_terminated: has_terminated.clone(),
terminate_waker: terminate_waker.clone(),
isolate_handle: isolate_handle.clone(),
cancel: CancelHandle::new_rc(),
sender: ctrl_tx,
worker_type,
};
let external_handle = SendableWebWorkerHandle {
receiver: ctrl_rx,
port: worker_port,
termination_signal,
has_terminated,
terminate_waker,
isolate_handle,
};
(internal_handle, external_handle)
}
pub struct WebWorker {
id: WorkerId,
pub js_runtime: JsRuntime,
pub name: String,
internal_handle: WebWorkerInternalHandle,
pub worker_type: WebWorkerType,
pub main_module: ModuleSpecifier,
poll_for_messages_fn: Option<v8::Global<v8::Value>>,
}
#[derive(Builder, Clone)]
pub struct WebWorkerOptions {
pub bootstrap: BootstrapOptions,
pub unsafely_ignore_certificate_errors: Option<Vec<String>>,
pub root_cert_store: Option<RootCertStore>,
pub seed: Option<u64>,
pub module_loader: Rc<dyn ModuleLoader>,
pub create_web_worker_cb: Arc<ops::worker_host::CreateWebWorkerCb>,
pub preload_module_cb: Arc<ops::worker_host::PreloadModuleCb>,
pub format_js_error_fn: Option<Arc<FormatJsErrorFn>>,
pub worker_type: WebWorkerType,
pub maybe_inspector_server: Option<Arc<InspectorServer>>,
pub get_error_class_fn: Option<GetErrorClassFn>,
pub blob_store: BlobStore,
pub broadcast_channel: InMemoryBroadcastChannel,
pub shared_array_buffer_store: Option<SharedArrayBufferStore>,
pub compiled_wasm_module_store: Option<CompiledWasmModuleStore>,
pub stdio: Stdio,
pub permissions: Permissions,
pub startup_snapshot: Option<StartSnapshot>,
}
impl WebWorker {
pub fn bootstrap_from_options(
name: String,
main_module: ModuleSpecifier,
worker_id: WorkerId,
options: WebWorkerOptions,
exts: Vec<Extension>,
) -> (Self, SendableWebWorkerHandle) {
let bootstrap_options = options.bootstrap.clone();
let (mut worker, handle) = Self::from_options(name, main_module, worker_id, options, exts);
worker.bootstrap(&bootstrap_options);
(worker, handle)
}
pub fn from_options(
name: String,
main_module: ModuleSpecifier,
worker_id: WorkerId,
options: WebWorkerOptions,
exts: Vec<Extension>,
) -> (Self, SendableWebWorkerHandle) {
let permissions = options.permissions;
let unstable = options.bootstrap.unstable;
let enable_testing_features = options.bootstrap.enable_testing_features;
let perm_ext = Extension::builder()
.state(move |state| {
state.put::<Permissions>(permissions.clone());
state.put(ops::UnstableChecker { unstable });
state.put(ops::TestingFeaturesEnabled(enable_testing_features));
Ok(())
})
.build();
let mut extensions: Vec<Extension> = vec![
deno_webidl::init(),
deno_console::init(),
deno_url::init(),
deno_web::init::<Permissions>(options.blob_store.clone(), Some(main_module.clone())),
deno_fetch::init::<Permissions>(deno_fetch::Options {
user_agent: options.bootstrap.user_agent.clone(),
root_cert_store: options.root_cert_store.clone(),
unsafely_ignore_certificate_errors: options
.unsafely_ignore_certificate_errors
.clone(),
file_fetch_handler: Rc::new(deno_fetch::FsFetchHandler),
..Default::default()
}),
deno_websocket::init::<Permissions>(
options.bootstrap.user_agent.clone(),
options.root_cert_store.clone(),
options.unsafely_ignore_certificate_errors.clone(),
),
deno_webstorage::init(None).disable(),
deno_broadcast_channel::init(options.broadcast_channel.clone(), unstable),
deno_crypto::init(options.seed),
#[cfg(feature = "ext_webgpu")]
deno_webgpu::init(unstable),
#[cfg(feature = "ext_ffi")]
deno_ffi::init::<Permissions>(unstable),
ops::web_worker::init(),
ops::worker_host::init(
options.create_web_worker_cb.clone(),
options.preload_module_cb.clone(),
options.format_js_error_fn.clone(),
),
ops::fs_events::init(),
ops::fs::init(),
ops::io::init(),
ops::io::init_stdio(options.stdio),
deno_tls::init(),
deno_net::init::<Permissions>(
options.root_cert_store.clone(),
unstable,
options.unsafely_ignore_certificate_errors.clone(),
),
ops::os::init_for_worker(),
ops::permissions::init(),
ops::process::init(),
ops::spawn::init(),
ops::signal::init(),
ops::tty::init(),
deno_http::init(),
ops::http::init(),
perm_ext,
];
extensions.extend(exts);
let snapshot = if let Some(v) = options.startup_snapshot {
v.into()
} else {
js::deno_isolate_init()
};
let mut js_runtime = JsRuntime::new(RuntimeOptions {
module_loader: Some(options.module_loader.clone()),
startup_snapshot: Some(snapshot),
get_error_class_fn: options.get_error_class_fn,
shared_array_buffer_store: options.shared_array_buffer_store.clone(),
compiled_wasm_module_store: options.compiled_wasm_module_store.clone(),
extensions,
..Default::default()
});
if let Some(server) = options.maybe_inspector_server.clone() {
server.register_inspector(main_module.to_string(), &mut js_runtime, false);
}
let (internal_handle, external_handle) = {
let handle = js_runtime.v8_isolate().thread_safe_handle();
let (internal_handle, external_handle) =
create_handles(handle, name.clone(), options.worker_type);
let op_state = js_runtime.op_state();
let mut op_state = op_state.borrow_mut();
op_state.put(internal_handle.clone());
(internal_handle, external_handle)
};
(
Self {
id: worker_id,
js_runtime,
name,
internal_handle,
worker_type: options.worker_type,
main_module,
poll_for_messages_fn: None,
},
external_handle,
)
}
pub fn bootstrap(&mut self, options: &BootstrapOptions) {
let script = format!(
"bootstrap.workerRuntime({}, \"{}\", {}\")",
options.as_json(),
self.name,
self.id
);
self.execute_script(&located_script_name!(), &script)
.expect("Failed to execute worker bootstrap script");
let script = r#"
const pollForMessages = globalThis.pollForMessages;
delete globalThis.pollForMessages;
pollForMessages
"#;
let poll_for_messages_fn = self
.js_runtime
.execute_script(&located_script_name!(), script)
.expect("Failed to execute worker bootstrap script");
self.poll_for_messages_fn = Some(poll_for_messages_fn);
}
pub fn execute_script(&mut self, name: &str, source_code: &str) -> Result<(), AnyError> {
self.js_runtime.execute_script(name, source_code)?;
Ok(())
}
pub async fn preload_module(
&mut self,
module_specifier: &ModuleSpecifier,
main: bool,
) -> Result<ModuleId, AnyError> {
if main {
self.js_runtime
.load_main_module(module_specifier, None)
.await
} else {
self.js_runtime
.load_side_module(module_specifier, None)
.await
}
}
pub async fn execute_side_module(
&mut self,
module_specifier: &ModuleSpecifier,
) -> Result<(), AnyError> {
let id = self.preload_module(module_specifier, false).await?;
let mut receiver = self.js_runtime.mod_evaluate(id);
tokio::select! {
biased;
maybe_result = &mut receiver => {
debug!("received module evaluate {:#?}", maybe_result);
maybe_result.expect("Module evaluation result not provided.")
}
event_loop_result = self.js_runtime.run_event_loop(false) => {
event_loop_result?;
let maybe_result = receiver.await;
maybe_result.expect("Module evaluation result not provided.")
}
}
}
pub async fn execute_main_module(&mut self, id: ModuleId) -> Result<(), AnyError> {
let mut receiver = self.js_runtime.mod_evaluate(id);
tokio::select! {
biased;
maybe_result = &mut receiver => {
debug!("received worker module evaluate {:#?}", maybe_result);
maybe_result.unwrap_or(Ok(()))
}
event_loop_result = self.run_event_loop(false) => {
if self.internal_handle.is_terminated() {
return Ok(());
}
event_loop_result?;
let maybe_result = receiver.await;
maybe_result.unwrap_or(Ok(()))
}
}
}
fn poll_event_loop(
&mut self,
cx: &mut Context,
wait_for_inspector: bool,
) -> Poll<Result<(), AnyError>> {
if self.internal_handle.terminate_if_needed() {
return Poll::Ready(Ok(()));
}
self.internal_handle.terminate_waker.register(cx.waker());
match self.js_runtime.poll_event_loop(cx, wait_for_inspector) {
Poll::Ready(r) => {
if self.internal_handle.terminate_if_needed() {
return Poll::Ready(Ok(()));
}
if let Err(e) = r {
return Poll::Ready(Err(e));
}
panic!("coding error: either js is polling or the worker is terminated");
}
Poll::Pending => Poll::Pending,
}
}
pub async fn run_event_loop(&mut self, wait_for_inspector: bool) -> Result<(), AnyError> {
poll_fn(|cx| self.poll_event_loop(cx, wait_for_inspector)).await
}
fn start_polling_for_messages(&mut self) {
let poll_for_messages_fn = self.poll_for_messages_fn.take().unwrap();
let scope = &mut self.js_runtime.handle_scope();
let poll_for_messages = v8::Local::<v8::Value>::new(scope, poll_for_messages_fn);
let fn_ = v8::Local::<v8::Function>::try_from(poll_for_messages).unwrap();
let undefined = v8::undefined(scope);
fn_.call(scope, undefined.into(), &[]);
}
}
fn print_worker_error(error: &AnyError, name: &str, format_js_error_fn: Option<&FormatJsErrorFn>) {
let error_str = match format_js_error_fn {
Some(format_js_error_fn) => match error.downcast_ref::<JsError>() {
Some(js_error) => format_js_error_fn(js_error),
None => error.to_string(),
},
None => error.to_string(),
};
eprintln!(
"{}: Uncaught (in worker \"{}\") {}",
colors::red_bold("error"),
name,
error_str.trim_start_matches("Uncaught "),
);
}
pub fn run_web_worker(
worker: WebWorker,
specifier: ModuleSpecifier,
maybe_source_code: Option<String>,
preload_module_cb: Arc<ops::worker_host::PreloadModuleCb>,
format_js_error_fn: Option<Arc<FormatJsErrorFn>>,
) -> Result<(), AnyError> {
let name = worker.name.to_string();
let fut = async move {
let internal_handle = worker.internal_handle.clone();
let result = (preload_module_cb)(worker).await;
let mut worker = match result {
Ok(worker) => worker,
Err(e) => {
print_worker_error(&e, &name, format_js_error_fn.as_deref());
internal_handle
.post_event(WorkerControlEvent::TerminalError(e))
.expect("Failed to post message to host");
return Ok(());
}
};
let result = if let Some(source_code) = maybe_source_code {
let r = worker.execute_script(&located_script_name!(), &source_code);
worker.start_polling_for_messages();
r
} else {
match worker.preload_module(&specifier, true).await {
Ok(id) => {
worker.start_polling_for_messages();
worker.execute_main_module(id).await
}
Err(e) => Err(e),
}
};
if internal_handle.is_terminated() {
return Ok(());
}
let result = if result.is_ok() {
worker.run_event_loop(true).await
} else {
result
};
if let Err(e) = result {
print_worker_error(&e, &name, format_js_error_fn.as_deref());
internal_handle
.post_event(WorkerControlEvent::TerminalError(e))
.expect("Failed to post message to host");
return Ok(());
}
debug!("Worker thread shuts down {}", &name);
result
};
run_basic(fut)
}