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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use devtools_traits::{DevtoolsPageInfo, ScriptToDevtoolsControlMsg};
use dom::abstractworker::{SharedRt, SimpleWorkerErrorHandler};
use dom::abstractworker::WorkerScriptMsg;
use dom::bindings::codegen::Bindings::WorkerBinding;
use dom::bindings::codegen::Bindings::WorkerBinding::WorkerMethods;
use dom::bindings::error::{Error, ErrorResult, Fallible};
use dom::bindings::inheritance::Castable;
use dom::bindings::refcounted::Trusted;
use dom::bindings::reflector::{DomObject, reflect_dom_object};
use dom::bindings::root::DomRoot;
use dom::bindings::str::DOMString;
use dom::bindings::structuredclone::StructuredCloneData;
use dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
use dom::eventtarget::EventTarget;
use dom::globalscope::GlobalScope;
use dom::messageevent::MessageEvent;
use dom::workerglobalscope::prepare_workerscope_init;
use dom_struct::dom_struct;
use ipc_channel::ipc;
use js::jsapi::{HandleValue, JSAutoCompartment, JSContext};
use js::jsval::UndefinedValue;
use script_traits::WorkerScriptLoadOrigin;
use std::cell::Cell;
use std::sync::{Arc, Mutex};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::mpsc::{Sender, channel};
use task::TaskOnce;
pub type TrustedWorkerAddress = Trusted<Worker>;
// https://html.spec.whatwg.org/multipage/#worker
#[dom_struct]
pub struct Worker {
eventtarget: EventTarget,
#[ignore_malloc_size_of = "Defined in std"]
/// Sender to the Receiver associated with the DedicatedWorkerGlobalScope
/// this Worker created.
sender: Sender<(TrustedWorkerAddress, WorkerScriptMsg)>,
#[ignore_malloc_size_of = "Arc"]
closing: Arc<AtomicBool>,
#[ignore_malloc_size_of = "Defined in rust-mozjs"]
runtime: Arc<Mutex<Option<SharedRt>>>,
terminated: Cell<bool>,
}
impl Worker {
fn new_inherited(sender: Sender<(TrustedWorkerAddress, WorkerScriptMsg)>,
closing: Arc<AtomicBool>) -> Worker {
Worker {
eventtarget: EventTarget::new_inherited(),
sender: sender,
closing: closing,
runtime: Arc::new(Mutex::new(None)),
terminated: Cell::new(false),
}
}
pub fn new(global: &GlobalScope,
sender: Sender<(TrustedWorkerAddress, WorkerScriptMsg)>,
closing: Arc<AtomicBool>) -> DomRoot<Worker> {
reflect_dom_object(Box::new(Worker::new_inherited(sender, closing)),
global,
WorkerBinding::Wrap)
}
// https://html.spec.whatwg.org/multipage/#dom-worker
#[allow(unsafe_code)]
pub fn Constructor(global: &GlobalScope, script_url: DOMString) -> Fallible<DomRoot<Worker>> {
// Step 2-4.
let worker_url = match global.api_base_url().join(&script_url) {
Ok(url) => url,
Err(_) => return Err(Error::Syntax),
};
let (sender, receiver) = channel();
let closing = Arc::new(AtomicBool::new(false));
let worker = Worker::new(global, sender.clone(), closing.clone());
global.track_worker(closing.clone());
let worker_ref = Trusted::new(&*worker);
let worker_load_origin = WorkerScriptLoadOrigin {
referrer_url: None,
referrer_policy: None,
pipeline_id: Some(global.pipeline_id()),
};
let (devtools_sender, devtools_receiver) = ipc::channel().unwrap();
let worker_id = global.get_next_worker_id();
if let Some(ref chan) = global.devtools_chan() {
let pipeline_id = global.pipeline_id();
let title = format!("Worker for {}", worker_url);
let page_info = DevtoolsPageInfo {
title: title,
url: worker_url.clone(),
};
let _ = chan.send(ScriptToDevtoolsControlMsg::NewGlobal((pipeline_id, Some(worker_id)),
devtools_sender.clone(),
page_info));
}
let init = prepare_workerscope_init(global, Some(devtools_sender));
DedicatedWorkerGlobalScope::run_worker_scope(
init, worker_url, devtools_receiver, worker.runtime.clone(), worker_ref,
global.script_chan(), sender, receiver, worker_load_origin, closing);
Ok(worker)
}
pub fn is_closing(&self) -> bool {
self.closing.load(Ordering::SeqCst)
}
pub fn is_terminated(&self) -> bool {
self.terminated.get()
}
pub fn handle_message(address: TrustedWorkerAddress,
data: StructuredCloneData) {
let worker = address.root();
if worker.is_terminated() {
return;
}
let global = worker.global();
let target = worker.upcast();
let _ac = JSAutoCompartment::new(global.get_cx(), target.reflector().get_jsobject().get());
rooted!(in(global.get_cx()) let mut message = UndefinedValue());
data.read(&global, message.handle_mut());
MessageEvent::dispatch_jsval(target, &global, message.handle());
}
pub fn dispatch_simple_error(address: TrustedWorkerAddress) {
let worker = address.root();
worker.upcast().fire_event(atom!("error"));
}
}
impl WorkerMethods for Worker {
#[allow(unsafe_code)]
// https://html.spec.whatwg.org/multipage/#dom-worker-postmessage
unsafe fn PostMessage(&self, cx: *mut JSContext, message: HandleValue) -> ErrorResult {
let data = StructuredCloneData::write(cx, message)?;
let address = Trusted::new(self);
// NOTE: step 9 of https://html.spec.whatwg.org/multipage/#dom-messageport-postmessage
// indicates that a nonexistent communication channel should result in a silent error.
let _ = self.sender.send((address, WorkerScriptMsg::DOMMessage(data)));
Ok(())
}
// https://html.spec.whatwg.org/multipage/#terminate-a-worker
fn Terminate(&self) {
// Step 1
if self.closing.swap(true, Ordering::SeqCst) {
return;
}
// Step 2
self.terminated.set(true);
// Step 3
if let Some(runtime) = *self.runtime.lock().unwrap() {
runtime.request_interrupt();
}
}
// https://html.spec.whatwg.org/multipage/#handler-worker-onmessage
event_handler!(message, GetOnmessage, SetOnmessage);
// https://html.spec.whatwg.org/multipage/#handler-workerglobalscope-onerror
event_handler!(error, GetOnerror, SetOnerror);
}
impl TaskOnce for SimpleWorkerErrorHandler<Worker> {
#[allow(unrooted_must_root)]
fn run_once(self) {
Worker::dispatch_simple_error(self.addr);
}
}
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