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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::ops;
use crate::state::ThreadSafeState;
use crate::worker::Worker;
use crate::worker::WorkerChannels;
use deno_core;
use deno_core::ErrBox;
use deno_core::StartupData;
use futures::future::FutureExt;
use std::future::Future;
use std::ops::Deref;
use std::ops::DerefMut;
use std::pin::Pin;
use std::task::Context;
use std::task::Poll;
/// This worker is implementation of `Worker` Web API
///
/// At the moment this type of worker supports only
/// communication with parent and creating new workers.
///
/// Each `WebWorker` is either a child of `MainWorker` or other
/// `WebWorker`.
#[derive(Clone)]
pub struct WebWorker(Worker);
impl WebWorker {
pub fn new(
name: String,
startup_data: StartupData,
state: ThreadSafeState,
external_channels: WorkerChannels,
) -> Self {
let state_ = state.clone();
let worker = Worker::new(name, startup_data, state_, external_channels);
{
let mut isolate = worker.isolate.try_lock().unwrap();
ops::runtime::init(&mut isolate, &state);
ops::web_worker::init(&mut isolate, &state);
ops::worker_host::init(&mut isolate, &state);
ops::errors::init(&mut isolate, &state);
ops::timers::init(&mut isolate, &state);
ops::fetch::init(&mut isolate, &state);
}
Self(worker)
}
}
impl Deref for WebWorker {
type Target = Worker;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for WebWorker {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
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();
inner.0.poll_unpin(cx)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::startup_data;
use crate::state::ThreadSafeState;
use crate::tokio_util;
use futures::executor::block_on;
pub fn run_in_task<F>(f: F)
where
F: FnOnce() + Send + 'static,
{
let fut = futures::future::lazy(move |_cx| f());
tokio_util::run(fut)
}
fn create_test_worker() -> WebWorker {
let (int, ext) = ThreadSafeState::create_channels();
let state = ThreadSafeState::mock(
vec![String::from("./deno"), String::from("hello.js")],
int,
);
let mut worker = WebWorker::new(
"TEST".to_string(),
startup_data::deno_isolate_init(),
state,
ext,
);
worker.execute("bootstrapWorkerRuntime(\"TEST\")").unwrap();
worker.execute("runWorkerMessageLoop()").unwrap();
worker
}
#[test]
fn test_worker_messages() {
run_in_task(|| {
let mut worker = create_test_worker();
let source = r#"
onmessage = function(e) {
console.log("msg from main script", e.data);
if (e.data == "exit") {
delete self.onmessage;
return;
} else {
console.assert(e.data === "hi");
}
postMessage([1, 2, 3]);
console.log("after postMessage");
}
"#;
worker.execute(source).unwrap();
let worker_ = worker.clone();
let fut = async move {
let r = worker.await;
r.unwrap();
};
tokio::spawn(fut);
let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
let r = block_on(worker_.post_message(msg));
assert!(r.is_ok());
let maybe_msg = block_on(worker_.get_message());
assert!(maybe_msg.is_some());
// Check if message received is [1, 2, 3] in json
assert_eq!(*maybe_msg.unwrap(), *b"[1,2,3]");
let msg = json!("exit")
.to_string()
.into_boxed_str()
.into_boxed_bytes();
let r = block_on(worker_.post_message(msg));
assert!(r.is_ok());
})
}
#[test]
fn removed_from_resource_table_on_close() {
run_in_task(|| {
let mut worker = create_test_worker();
worker
.execute("onmessage = () => { delete self.onmessage; }")
.unwrap();
let worker_ = worker.clone();
let worker_future = async move {
let result = worker_.await;
println!("workers.rs after resource close");
result.unwrap();
}
.shared();
let worker_future_ = worker_future.clone();
tokio::spawn(worker_future_);
let msg = json!("hi").to_string().into_boxed_str().into_boxed_bytes();
let r = block_on(worker.post_message(msg));
assert!(r.is_ok());
block_on(worker_future)
})
}
}
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