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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use crate::isolate::Buf;
use crate::isolate::Isolate;
use crate::isolate::IsolateState;
use crate::isolate::WorkerChannels;
use crate::js_errors::JSError;
use crate::ops;
use crate::resources;
use crate::snapshot;
use crate::tokio_util;
use futures::sync::mpsc;
use futures::sync::oneshot;
use futures::Future;
use std::sync::Arc;
use std::thread;
/// Rust interface for WebWorkers.
pub struct Worker {
isolate: Isolate,
}
impl Worker {
pub fn new(parent_state: &Arc<IsolateState>) -> (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);
let state = Arc::new(IsolateState::new(
parent_state.flags.clone(),
parent_state.argv.clone(),
Some(internal_channels),
));
let snapshot = snapshot::deno_snapshot();
let isolate = Isolate::new(snapshot, state, ops::dispatch);
let worker = Worker { isolate };
(worker, external_channels)
}
pub fn execute(&self, js_source: &str) -> Result<(), JSError> {
self.isolate.execute(js_source)
}
pub fn event_loop(&self) -> Result<(), JSError> {
self.isolate.event_loop()
}
}
pub fn spawn(
state: Arc<IsolateState>,
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 || {
let (worker, external_channels) = Worker::new(&state);
let resource = resources::add_worker(external_channels);
p.send(resource.clone()).unwrap();
tokio_util::init(|| {
(|| -> Result<(), JSError> {
worker.execute("denoMain()")?;
worker.execute("workerMain()")?;
worker.execute(&js_source)?;
worker.event_loop()?;
Ok(())
})().or_else(|err: JSError| -> Result<(), JSError> {
eprintln!("{}", err.to_string());
std::process::exit(1)
}).unwrap();
});
resource.close();
}).unwrap();
c.wait().unwrap()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_spawn() {
let resource = spawn(
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(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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