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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use crate::isolate::{DenoBehavior, Isolate};
use crate::isolate_state::WorkerChannels;
use crate::js_errors::JSErrorColor;
use crate::resources;
use crate::tokio_util;
use deno::Buf;
use deno::JSError;
use futures::future::lazy;
use futures::sync::mpsc;
use futures::sync::oneshot;
use futures::Future;
use futures::Poll;
use std::thread;
/// Behavior trait specific to workers
pub trait WorkerBehavior: DenoBehavior {
/// Used to setup internal channels at worker creation.
/// This is intended to be temporary fix.
/// TODO(afinch7) come up with a better solution to set worker channels
fn set_internal_channels(&mut self, worker_channels: WorkerChannels);
}
/// Rust interface for WebWorkers.
pub struct Worker<B: WorkerBehavior> {
isolate: Isolate<B>,
}
impl<B: WorkerBehavior> Worker<B> {
pub fn new(mut behavior: B) -> (Self, WorkerChannels) {
let (worker_in_tx, worker_in_rx) = mpsc::channel::<Buf>(1);
let (worker_out_tx, worker_out_rx) = mpsc::channel::<Buf>(1);
let internal_channels = (worker_out_tx, worker_in_rx);
let external_channels = (worker_in_tx, worker_out_rx);
behavior.set_internal_channels(internal_channels);
let isolate = Isolate::new(behavior);
let worker = Worker { isolate };
(worker, external_channels)
}
pub fn execute(&mut self, js_source: &str) -> Result<(), JSError> {
self.isolate.execute(js_source)
}
}
impl<B: WorkerBehavior> Future for Worker<B> {
type Item = ();
type Error = JSError;
fn poll(&mut self) -> Poll<(), JSError> {
self.isolate.poll()
}
}
pub fn spawn<B: WorkerBehavior + 'static>(
behavior: B,
js_source: String,
) -> resources::Resource {
// TODO This function should return a Future, so that the caller can retrieve
// the JSError if one is thrown. Currently it just prints to stderr and calls
// exit(1).
// let (js_error_tx, js_error_rx) = oneshot::channel::<JSError>();
let (p, c) = oneshot::channel::<resources::Resource>();
let builder = thread::Builder::new().name("worker".to_string());
let _tid = builder
.spawn(move || {
tokio_util::run(lazy(move || {
let (mut worker, external_channels) = Worker::new(behavior);
let resource = resources::add_worker(external_channels);
p.send(resource.clone()).unwrap();
worker
.execute("denoMain()")
.expect("worker denoMain failed");
worker
.execute("workerMain()")
.expect("worker workerMain failed");
worker.execute(&js_source).expect("worker js_source failed");
worker.then(move |r| -> Result<(), ()> {
resource.close();
debug!("workers.rs after resource close");
if let Err(err) = r {
eprintln!("{}", JSErrorColor(&err).to_string());
std::process::exit(1);
}
Ok(())
})
}));
debug!("workers.rs after spawn");
}).unwrap();
c.wait().unwrap()
}
#[cfg(test)]
mod tests {
use super::*;
use crate::compiler::CompilerBehavior;
use crate::isolate_state::IsolateState;
use std::sync::Arc;
#[test]
fn test_spawn() {
let resource = spawn(
CompilerBehavior::new(Arc::new(IsolateState::mock())),
r#"
onmessage = function(e) {
let s = new TextDecoder().decode(e.data);;
console.log("msg from main script", s);
if (s == "exit") {
close();
return;
} else {
console.assert(s === "hi");
}
postMessage(new Uint8Array([1, 2, 3]));
console.log("after postMessage");
}
"#.into(),
);
let msg = String::from("hi").into_boxed_str().into_boxed_bytes();
let r = resources::worker_post_message(resource.rid, msg).wait();
assert!(r.is_ok());
let maybe_msg =
resources::worker_recv_message(resource.rid).wait().unwrap();
assert!(maybe_msg.is_some());
assert_eq!(*maybe_msg.unwrap(), [1, 2, 3]);
let msg = String::from("exit").into_boxed_str().into_boxed_bytes();
let r = resources::worker_post_message(resource.rid, msg).wait();
assert!(r.is_ok());
}
#[test]
fn removed_from_resource_table_on_close() {
let resource = spawn(
CompilerBehavior::new(Arc::new(IsolateState::mock())),
"onmessage = () => close();".into(),
);
assert_eq!(
resources::get_type(resource.rid),
Some("worker".to_string())
);
let msg = String::from("hi").into_boxed_str().into_boxed_bytes();
let r = resources::worker_post_message(resource.rid, msg).wait();
assert!(r.is_ok());
println!("rid {:?}", resource.rid);
// TODO Need a way to get a future for when a resource closes.
// For now, just sleep for a bit.
// resource.close();
thread::sleep(std::time::Duration::from_millis(1000));
assert_eq!(resources::get_type(resource.rid), None);
}
}
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