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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::fmt_errors::JSError;
use crate::ops;
use crate::state::ThreadSafeState;
use crate::worker::WorkerChannels;
use crate::worker::WorkerReceiver;
use deno_core;
use deno_core::Buf;
use deno_core::ErrBox;
use deno_core::ModuleSpecifier;
use deno_core::StartupData;
use futures::future::FutureExt;
use futures::future::TryFutureExt;
use futures::sink::SinkExt;
use futures::task::AtomicWaker;
use std::env;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::sync::Mutex;
use std::task::Context;
use std::task::Poll;
use tokio::sync::Mutex as AsyncMutex;
use url::Url;
#[derive(Clone)]
pub struct WebWorker {
pub name: String,
pub isolate: Arc<AsyncMutex<Box<deno_core::EsIsolate>>>,
pub state: ThreadSafeState,
external_channels: Arc<Mutex<WorkerChannels>>,
}
impl WebWorker {
pub fn new(
name: String,
startup_data: StartupData,
state: ThreadSafeState,
external_channels: WorkerChannels,
) -> Self {
let mut isolate =
deno_core::EsIsolate::new(Box::new(state.clone()), startup_data, false);
ops::web_worker::init(&mut isolate, &state);
ops::worker_host::init(&mut isolate, &state);
let global_state_ = state.global_state.clone();
isolate.set_js_error_create(move |v8_exception| {
JSError::from_v8_exception(v8_exception, &global_state_.ts_compiler)
});
Self {
name,
isolate: Arc::new(AsyncMutex::new(isolate)),
state,
external_channels: Arc::new(Mutex::new(external_channels)),
}
}
/// Same as execute2() but the filename defaults to "$CWD/__anonymous__".
pub fn execute(&mut self, js_source: &str) -> Result<(), ErrBox> {
let path = env::current_dir().unwrap().join("__anonymous__");
let url = Url::from_file_path(path).unwrap();
self.execute2(url.as_str(), js_source)
}
/// Executes the provided JavaScript source code. The js_filename argument is
/// provided only for debugging purposes.
fn execute2(
&mut self,
js_filename: &str,
js_source: &str,
) -> Result<(), ErrBox> {
let mut isolate = self.isolate.try_lock().unwrap();
isolate.execute(js_filename, js_source)
}
/// Executes the provided JavaScript module.
///
/// Takes ownership of the isolate behind mutex.
pub async fn execute_mod_async(
&mut self,
module_specifier: &ModuleSpecifier,
maybe_code: Option<String>,
is_prefetch: bool,
) -> Result<(), ErrBox> {
let specifier = module_specifier.to_string();
let worker = self.clone();
let mut isolate = self.isolate.lock().await;
let id = isolate.load_module(&specifier, maybe_code).await?;
worker.state.global_state.progress.done();
if !is_prefetch {
return isolate.mod_evaluate(id);
}
Ok(())
}
/// Post message to worker as a host.
///
/// This method blocks current thread.
pub fn post_message(
&self,
buf: Buf,
) -> impl Future<Output = Result<(), ErrBox>> {
let channels = self.external_channels.lock().unwrap();
let mut sender = channels.sender.clone();
async move {
let result = sender.send(buf).map_err(ErrBox::from).await;
drop(sender);
result
}
}
/// Get message from worker as a host.
pub fn get_message(&self) -> WorkerReceiver {
WorkerReceiver {
channels: self.external_channels.clone(),
}
}
pub fn clear_exception(&mut self) {
let mut isolate = self.isolate.try_lock().unwrap();
isolate.clear_exception();
}
}
impl Future for WebWorker {
type Output = Result<(), ErrBox>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let inner = self.get_mut();
let waker = AtomicWaker::new();
waker.register(cx.waker());
match inner.isolate.try_lock() {
Ok(mut isolate) => isolate.poll_unpin(cx),
Err(_) => {
waker.wake();
Poll::Pending
}
}
}
}
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