servo/components/script/dom/dedicatedworkerglobalscope.rs

259 lines
10 KiB
Rust

/* 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 dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding;
use dom::bindings::codegen::Bindings::DedicatedWorkerGlobalScopeBinding::DedicatedWorkerGlobalScopeMethods;
use dom::bindings::codegen::Bindings::ErrorEventBinding::ErrorEventMethods;
use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull;
use dom::bindings::codegen::InheritTypes::DedicatedWorkerGlobalScopeDerived;
use dom::bindings::codegen::InheritTypes::{EventTargetCast, WorkerGlobalScopeCast};
use dom::bindings::error::ErrorResult;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{JSRef, Temporary, RootCollection};
use dom::bindings::refcounted::LiveDOMReferences;
use dom::bindings::structuredclone::StructuredCloneData;
use dom::bindings::utils::Reflectable;
use dom::errorevent::ErrorEvent;
use dom::eventtarget::{EventTarget, EventTargetHelpers, EventTargetTypeId};
use dom::messageevent::MessageEvent;
use dom::worker::{TrustedWorkerAddress, WorkerMessageHandler, Worker};
use dom::workerglobalscope::{WorkerGlobalScope, WorkerGlobalScopeHelpers};
use dom::workerglobalscope::WorkerGlobalScopeTypeId;
use script_task::{ScriptTask, ScriptChan, ScriptMsg, TimerSource};
use script_task::ScriptMsg::WorkerDispatchErrorEvent;
use script_task::StackRootTLS;
use servo_net::resource_task::{ResourceTask, load_whole_resource};
use util::task::spawn_named;
use util::task_state;
use util::task_state::{SCRIPT, IN_WORKER};
use js::jsapi::JSContext;
use js::jsval::JSVal;
use js::rust::Cx;
use std::rc::Rc;
use std::sync::mpsc::{Sender, Receiver};
use url::Url;
/// A ScriptChan that can be cloned freely and will silently send a TrustedWorkerAddress with
/// every message. While this SendableWorkerScriptChan is alive, the associated Worker object
/// will remain alive.
#[derive(Clone)]
#[jstraceable]
pub struct SendableWorkerScriptChan {
sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
worker: TrustedWorkerAddress,
}
impl ScriptChan for SendableWorkerScriptChan {
fn send(&self, msg: ScriptMsg) {
self.sender.send((self.worker.clone(), msg)).unwrap();
}
fn clone(&self) -> Box<ScriptChan + Send> {
box SendableWorkerScriptChan {
sender: self.sender.clone(),
worker: self.worker.clone(),
}
}
}
/// Set the `worker` field of a related DedicatedWorkerGlobalScope object to a particular
/// value for the duration of this object's lifetime. This ensures that the related Worker
/// object only lives as long as necessary (ie. while events are being executed), while
/// providing a reference that can be cloned freely.
struct AutoWorkerReset<'a> {
workerscope: JSRef<'a, DedicatedWorkerGlobalScope>,
old_worker: Option<TrustedWorkerAddress>,
}
impl<'a> AutoWorkerReset<'a> {
fn new(workerscope: JSRef<'a, DedicatedWorkerGlobalScope>, worker: TrustedWorkerAddress) -> AutoWorkerReset<'a> {
let reset = AutoWorkerReset {
workerscope: workerscope,
old_worker: workerscope.worker.borrow().clone()
};
*workerscope.worker.borrow_mut() = Some(worker);
reset
}
}
#[unsafe_destructor]
impl<'a> Drop for AutoWorkerReset<'a> {
fn drop(&mut self) {
*self.workerscope.worker.borrow_mut() = self.old_worker.clone();
}
}
#[dom_struct]
pub struct DedicatedWorkerGlobalScope {
workerglobalscope: WorkerGlobalScope,
receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>,
own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
worker: DOMRefCell<Option<TrustedWorkerAddress>>,
/// Sender to the parent thread.
parent_sender: Box<ScriptChan+Send>,
}
impl DedicatedWorkerGlobalScope {
fn new_inherited(worker_url: Url,
cx: Rc<Cx>,
resource_task: ResourceTask,
parent_sender: Box<ScriptChan+Send>,
own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>)
-> DedicatedWorkerGlobalScope {
DedicatedWorkerGlobalScope {
workerglobalscope: WorkerGlobalScope::new_inherited(
WorkerGlobalScopeTypeId::DedicatedGlobalScope, worker_url, cx, resource_task),
receiver: receiver,
own_sender: own_sender,
parent_sender: parent_sender,
worker: DOMRefCell::new(None),
}
}
pub fn new(worker_url: Url,
cx: Rc<Cx>,
resource_task: ResourceTask,
parent_sender: Box<ScriptChan+Send>,
own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>)
-> Temporary<DedicatedWorkerGlobalScope> {
let scope = box DedicatedWorkerGlobalScope::new_inherited(
worker_url, cx.clone(), resource_task, parent_sender,
own_sender, receiver);
DedicatedWorkerGlobalScopeBinding::Wrap(cx.ptr, scope)
}
}
impl DedicatedWorkerGlobalScope {
pub fn run_worker_scope(worker_url: Url,
worker: TrustedWorkerAddress,
resource_task: ResourceTask,
parent_sender: Box<ScriptChan+Send>,
own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>) {
spawn_named(format!("WebWorker for {}", worker_url.serialize()), move || {
task_state::initialize(SCRIPT | IN_WORKER);
let roots = RootCollection::new();
let _stack_roots_tls = StackRootTLS::new(&roots);
let (url, source) = match load_whole_resource(&resource_task, worker_url.clone()) {
Err(_) => {
println!("error loading script {}", worker_url.serialize());
return;
}
Ok((metadata, bytes)) => {
(metadata.final_url, String::from_utf8(bytes).unwrap())
}
};
let (_js_runtime, js_context) = ScriptTask::new_rt_and_cx();
let global = DedicatedWorkerGlobalScope::new(
worker_url, js_context.clone(), resource_task,
parent_sender, own_sender, receiver).root();
{
let _ar = AutoWorkerReset::new(global.r(), worker);
match js_context.evaluate_script(
global.r().reflector().get_jsobject(), source, url.serialize(), 1) {
Ok(_) => (),
Err(_) => println!("evaluate_script failed")
}
}
loop {
match global.r().receiver.recv() {
Ok((linked_worker, msg)) => {
let _ar = AutoWorkerReset::new(global.r(), linked_worker);
global.r().handle_event(msg);
}
Err(_) => break,
}
}
});
}
}
pub trait DedicatedWorkerGlobalScopeHelpers {
fn script_chan(self) -> Box<ScriptChan+Send>;
}
impl<'a> DedicatedWorkerGlobalScopeHelpers for JSRef<'a, DedicatedWorkerGlobalScope> {
fn script_chan(self) -> Box<ScriptChan+Send> {
box SendableWorkerScriptChan {
sender: self.own_sender.clone(),
worker: self.worker.borrow().as_ref().unwrap().clone(),
}
}
}
trait PrivateDedicatedWorkerGlobalScopeHelpers {
fn handle_event(self, msg: ScriptMsg);
fn dispatch_error_to_worker(self, JSRef<ErrorEvent>);
}
impl<'a> PrivateDedicatedWorkerGlobalScopeHelpers for JSRef<'a, DedicatedWorkerGlobalScope> {
fn handle_event(self, msg: ScriptMsg) {
match msg {
ScriptMsg::DOMMessage(data) => {
let scope: JSRef<WorkerGlobalScope> = WorkerGlobalScopeCast::from_ref(self);
let target: JSRef<EventTarget> = EventTargetCast::from_ref(self);
let message = data.read(GlobalRef::Worker(scope));
MessageEvent::dispatch_jsval(target, GlobalRef::Worker(scope), message);
},
ScriptMsg::RunnableMsg(runnable) => {
runnable.handler()
},
ScriptMsg::RefcountCleanup(addr) => {
let scope: JSRef<WorkerGlobalScope> = WorkerGlobalScopeCast::from_ref(self);
LiveDOMReferences::cleanup(scope.get_cx(), addr);
}
ScriptMsg::WorkerDispatchErrorEvent(addr, msg, file_name, line_num, col_num) => {
Worker::handle_error_message(addr, msg, file_name, line_num, col_num);
},
ScriptMsg::FireTimer(TimerSource::FromWorker, timer_id) => {
let scope: JSRef<WorkerGlobalScope> = WorkerGlobalScopeCast::from_ref(self);
scope.handle_fire_timer(timer_id);
}
_ => panic!("Unexpected message"),
}
}
fn dispatch_error_to_worker(self, errorevent: JSRef<ErrorEvent>) {
let msg = errorevent.Message();
let file_name = errorevent.Filename();
let line_num = errorevent.Lineno();
let col_num = errorevent.Colno();
let worker = self.worker.borrow().as_ref().unwrap().clone();
self.parent_sender.send(ScriptMsg::WorkerDispatchErrorEvent(worker, msg, file_name,
line_num, col_num));
}
}
impl<'a> DedicatedWorkerGlobalScopeMethods for JSRef<'a, DedicatedWorkerGlobalScope> {
fn PostMessage(self, cx: *mut JSContext, message: JSVal) -> ErrorResult {
let data = try!(StructuredCloneData::write(cx, message));
let worker = self.worker.borrow().as_ref().unwrap().clone();
self.parent_sender.send(ScriptMsg::RunnableMsg(
box WorkerMessageHandler::new(worker, data)));
Ok(())
}
event_handler!(message, GetOnmessage, SetOnmessage);
}
impl DedicatedWorkerGlobalScopeDerived for EventTarget {
fn is_dedicatedworkerglobalscope(&self) -> bool {
match *self.type_id() {
EventTargetTypeId::WorkerGlobalScope(WorkerGlobalScopeTypeId::DedicatedGlobalScope) => true,
_ => false
}
}
}