mirror of
https://github.com/denoland/deno.git
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357 lines
9.8 KiB
Rust
357 lines
9.8 KiB
Rust
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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use crate::ops;
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use crate::state::State;
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use crate::worker::Worker;
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use crate::worker::WorkerEvent;
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use crate::worker::WorkerHandle;
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use deno_core::v8;
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use deno_core::ErrBox;
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use deno_core::StartupData;
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use futures::channel::mpsc;
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use futures::future::FutureExt;
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use futures::stream::StreamExt;
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use std::future::Future;
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use std::ops::Deref;
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use std::ops::DerefMut;
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use std::pin::Pin;
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use std::sync::atomic::AtomicBool;
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use std::sync::atomic::Ordering;
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use std::sync::Arc;
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use std::task::Context;
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use std::task::Poll;
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/// Wrapper for `WorkerHandle` that adds functionality
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/// for terminating workers.
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///
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/// This struct is used by host as well as worker itself.
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///
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/// Host uses it to communicate with worker and terminate it,
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/// while worker uses it only to finish execution on `self.close()`.
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#[derive(Clone)]
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pub struct WebWorkerHandle {
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worker_handle: WorkerHandle,
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terminate_tx: mpsc::Sender<()>,
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terminated: Arc<AtomicBool>,
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isolate_handle: v8::IsolateHandle,
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}
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impl Deref for WebWorkerHandle {
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type Target = WorkerHandle;
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fn deref(&self) -> &Self::Target {
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&self.worker_handle
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}
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}
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impl DerefMut for WebWorkerHandle {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.worker_handle
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}
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}
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impl WebWorkerHandle {
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pub fn terminate(&self) {
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// This function can be called multiple times by whomever holds
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// the handle. However only a single "termination" should occur so
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// we need a guard here.
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let already_terminated = self.terminated.swap(true, Ordering::Relaxed);
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if !already_terminated {
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self.isolate_handle.terminate_execution();
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let mut sender = self.terminate_tx.clone();
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// This call should be infallible hence the `expect`.
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// This might change in the future.
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sender.try_send(()).expect("Failed to terminate");
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}
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}
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}
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/// This worker is implementation of `Worker` Web API
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///
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/// At the moment this type of worker supports only
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/// communication with parent and creating new workers.
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///
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/// Each `WebWorker` is either a child of `MainWorker` or other
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/// `WebWorker`.
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pub struct WebWorker {
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worker: Worker,
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event_loop_idle: bool,
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terminate_rx: mpsc::Receiver<()>,
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handle: WebWorkerHandle,
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pub has_deno_namespace: bool,
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}
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impl WebWorker {
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pub fn new(
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name: String,
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startup_data: StartupData,
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state: State,
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has_deno_namespace: bool,
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) -> Self {
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let state_ = state.clone();
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let mut worker = Worker::new(name, startup_data, state_);
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let terminated = Arc::new(AtomicBool::new(false));
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let isolate_handle = worker
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.isolate
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.v8_isolate
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.as_mut()
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.unwrap()
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.thread_safe_handle();
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let (terminate_tx, terminate_rx) = mpsc::channel::<()>(1);
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let handle = WebWorkerHandle {
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worker_handle: worker.thread_safe_handle(),
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terminated,
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isolate_handle,
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terminate_tx,
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};
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let mut web_worker = Self {
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worker,
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event_loop_idle: false,
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terminate_rx,
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handle,
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has_deno_namespace,
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};
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let handle = web_worker.thread_safe_handle();
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{
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let isolate = &mut web_worker.worker.isolate;
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ops::runtime::init(isolate, &state);
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ops::web_worker::init(
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isolate,
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&state,
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&web_worker.worker.internal_channels.sender,
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handle,
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);
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ops::worker_host::init(isolate, &state);
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ops::io::init(isolate, &state);
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ops::resources::init(isolate, &state);
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ops::errors::init(isolate, &state);
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ops::timers::init(isolate, &state);
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ops::fetch::init(isolate, &state);
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if has_deno_namespace {
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ops::runtime_compiler::init(isolate, &state);
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ops::fs::init(isolate, &state);
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ops::fs_events::init(isolate, &state);
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ops::plugins::init(isolate, &state);
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ops::net::init(isolate, &state);
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ops::tls::init(isolate, &state);
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ops::os::init(isolate, &state);
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ops::permissions::init(isolate, &state);
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ops::process::init(isolate, &state);
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ops::random::init(isolate, &state);
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ops::signal::init(isolate, &state);
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ops::tty::init(isolate, &state);
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}
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}
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web_worker
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}
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}
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impl WebWorker {
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/// Returns a way to communicate with the Worker from other threads.
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pub fn thread_safe_handle(&self) -> WebWorkerHandle {
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self.handle.clone()
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}
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}
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impl Deref for WebWorker {
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type Target = Worker;
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fn deref(&self) -> &Self::Target {
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&self.worker
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}
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}
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impl DerefMut for WebWorker {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.worker
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}
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}
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impl Future for WebWorker {
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type Output = Result<(), ErrBox>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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let inner = self.get_mut();
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let worker = &mut inner.worker;
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let terminated = inner.handle.terminated.load(Ordering::Relaxed);
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if terminated {
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return Poll::Ready(Ok(()));
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}
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if !inner.event_loop_idle {
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match worker.poll_unpin(cx) {
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Poll::Ready(r) => {
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let terminated = inner.handle.terminated.load(Ordering::Relaxed);
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if terminated {
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return Poll::Ready(Ok(()));
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}
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if let Err(e) = r {
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let mut sender = worker.internal_channels.sender.clone();
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sender
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.try_send(WorkerEvent::Error(e))
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.expect("Failed to post message to host");
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}
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inner.event_loop_idle = true;
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}
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Poll::Pending => {}
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}
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}
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if let Poll::Ready(r) = inner.terminate_rx.poll_next_unpin(cx) {
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// terminate_rx should never be closed
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assert!(r.is_some());
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return Poll::Ready(Ok(()));
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}
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if let Poll::Ready(r) =
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worker.internal_channels.receiver.poll_next_unpin(cx)
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{
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match r {
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Some(msg) => {
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let msg = String::from_utf8(msg.to_vec()).unwrap();
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debug!("received message from host: {}", msg);
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let script = format!("workerMessageRecvCallback({})", msg);
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if let Err(e) = worker.execute(&script) {
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// If execution was terminated during message callback then
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// just ignore it
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if inner.handle.terminated.load(Ordering::Relaxed) {
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return Poll::Ready(Ok(()));
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}
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// Otherwise forward error to host
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let mut sender = worker.internal_channels.sender.clone();
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sender
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.try_send(WorkerEvent::Error(e))
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.expect("Failed to post message to host");
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}
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// Let event loop be polled again
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inner.event_loop_idle = false;
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worker.waker.wake();
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}
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None => unreachable!(),
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}
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}
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Poll::Pending
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::startup_data;
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use crate::state::State;
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use crate::tokio_util;
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use crate::worker::WorkerEvent;
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fn create_test_worker() -> WebWorker {
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let state = State::mock("./hello.js");
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let mut worker = WebWorker::new(
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"TEST".to_string(),
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startup_data::deno_isolate_init(),
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state,
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false,
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);
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worker
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.execute("bootstrap.workerRuntime(\"TEST\", false)")
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.unwrap();
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worker
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}
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#[test]
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fn test_worker_messages() {
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let (handle_sender, handle_receiver) =
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std::sync::mpsc::sync_channel::<WebWorkerHandle>(1);
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let join_handle = std::thread::spawn(move || {
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let mut worker = create_test_worker();
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let source = r#"
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onmessage = function(e) {
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console.log("msg from main script", e.data);
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if (e.data == "exit") {
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return close();
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} else {
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console.assert(e.data === "hi");
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}
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postMessage([1, 2, 3]);
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console.log("after postMessage");
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}
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"#;
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worker.execute(source).unwrap();
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let handle = worker.thread_safe_handle();
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handle_sender.send(handle).unwrap();
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let r = tokio_util::run_basic(worker);
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assert!(r.is_ok())
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});
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let mut handle = handle_receiver.recv().unwrap();
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tokio_util::run_basic(async move {
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let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
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let r = handle.post_message(msg.clone());
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assert!(r.is_ok());
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let maybe_msg = handle.get_event().await;
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assert!(maybe_msg.is_some());
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let r = handle.post_message(msg.clone());
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assert!(r.is_ok());
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let maybe_msg = handle.get_event().await;
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assert!(maybe_msg.is_some());
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match maybe_msg {
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Some(WorkerEvent::Message(buf)) => {
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assert_eq!(*buf, *b"[1,2,3]");
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}
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_ => unreachable!(),
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}
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let msg = json!("exit")
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.to_string()
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.into_boxed_str()
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.into_boxed_bytes();
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let r = handle.post_message(msg);
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assert!(r.is_ok());
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let event = handle.get_event().await;
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assert!(event.is_none());
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handle.sender.close_channel();
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});
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join_handle.join().expect("Failed to join worker thread");
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}
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#[test]
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fn removed_from_resource_table_on_close() {
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let (handle_sender, handle_receiver) =
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std::sync::mpsc::sync_channel::<WebWorkerHandle>(1);
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let join_handle = std::thread::spawn(move || {
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let mut worker = create_test_worker();
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worker.execute("onmessage = () => { close(); }").unwrap();
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let handle = worker.thread_safe_handle();
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handle_sender.send(handle).unwrap();
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let r = tokio_util::run_basic(worker);
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assert!(r.is_ok())
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});
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let mut handle = handle_receiver.recv().unwrap();
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tokio_util::run_basic(async move {
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let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
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let r = handle.post_message(msg.clone());
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assert!(r.is_ok());
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let event = handle.get_event().await;
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assert!(event.is_none());
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handle.sender.close_channel();
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});
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join_handle.join().expect("Failed to join worker thread");
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}
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}
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