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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 dom::bindings::codegen::Bindings::WorkerBinding;
use dom::bindings::codegen::Bindings::WorkerBinding::WorkerMethods;
use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull;
use dom::bindings::codegen::InheritTypes::EventTargetCast;
use dom::bindings::error::{Fallible, Syntax};
use dom::bindings::global::{GlobalRef, GlobalField};
use dom::bindings::js::{JS, JSRef, Temporary};
use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
use dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
use dom::eventtarget::{EventTarget, EventTargetHelpers, WorkerTypeId};
use dom::messageevent::MessageEvent;
use script_task::{ScriptChan, DOMMessage};
use servo_util::str::DOMString;
use js::glue::JS_STRUCTURED_CLONE_VERSION;
use js::jsapi::{JSContext, JS_AddObjectRoot, JS_RemoveObjectRoot};
use js::jsapi::{JS_ReadStructuredClone, JS_WriteStructuredClone};
use js::jsval::{JSVal, UndefinedValue};
use url::UrlParser;
use libc::{c_void, size_t};
use std::cell::Cell;
use std::ptr;
pub struct TrustedWorkerAddress(pub *const c_void);
#[deriving(Encodable)]
#[must_root]
pub struct Worker {
eventtarget: EventTarget,
refcount: Cell<uint>,
global: GlobalField,
/// Sender to the Receiver associated with the DedicatedWorkerGlobalScope
/// this Worker created.
sender: ScriptChan,
}
impl Worker {
pub fn new_inherited(global: &GlobalRef, sender: ScriptChan) -> Worker {
Worker {
eventtarget: EventTarget::new_inherited(WorkerTypeId),
refcount: Cell::new(0),
global: GlobalField::from_rooted(global),
sender: sender,
}
}
pub fn new(global: &GlobalRef, sender: ScriptChan) -> Temporary<Worker> {
reflect_dom_object(box Worker::new_inherited(global, sender),
global,
WorkerBinding::Wrap)
}
// http://www.whatwg.org/html/#dom-worker
pub fn Constructor(global: &GlobalRef, scriptURL: DOMString) -> Fallible<Temporary<Worker>> {
// Step 2-4.
let worker_url = match UrlParser::new().base_url(&global.get_url())
.parse(scriptURL.as_slice()) {
Ok(url) => url,
Err(_) => return Err(Syntax),
};
let resource_task = global.resource_task();
let (receiver, sender) = ScriptChan::new();
let worker = Worker::new(global, sender.clone()).root();
let worker_ref = worker.addref();
DedicatedWorkerGlobalScope::run_worker_scope(
worker_url, worker_ref, resource_task, global.script_chan().clone(),
sender, receiver);
Ok(Temporary::from_rooted(*worker))
}
pub fn handle_message(address: TrustedWorkerAddress,
data: *mut u64, nbytes: size_t) {
let worker = unsafe { JS::from_trusted_worker_address(address).root() };
let global = worker.global.root();
let mut message = UndefinedValue();
unsafe {
assert!(JS_ReadStructuredClone(
global.root_ref().get_cx(), data as *const u64, nbytes,
JS_STRUCTURED_CLONE_VERSION, &mut message,
ptr::null(), ptr::mut_null()) != 0);
}
let target: JSRef<EventTarget> = EventTargetCast::from_ref(*worker);
MessageEvent::dispatch_jsval(target, &global.root_ref(), message);
}
}
impl Worker {
// Creates a trusted address to the object, and roots it. Always pair this with a release()
pub fn addref(&self) -> TrustedWorkerAddress {
let refcount = self.refcount.get();
if refcount == 0 {
let cx = self.global.root().root_ref().get_cx();
unsafe {
JS_AddObjectRoot(cx, self.reflector().rootable());
}
}
self.refcount.set(refcount + 1);
TrustedWorkerAddress(self as *const Worker as *const c_void)
}
pub fn release(&self) {
let refcount = self.refcount.get();
assert!(refcount > 0)
self.refcount.set(refcount - 1);
if refcount == 1 {
let cx = self.global.root().root_ref().get_cx();
unsafe {
JS_RemoveObjectRoot(cx, self.reflector().rootable());
}
}
}
pub fn handle_release(address: TrustedWorkerAddress) {
let worker = unsafe { JS::from_trusted_worker_address(address).root() };
worker.release();
}
}
impl<'a> WorkerMethods for JSRef<'a, Worker> {
fn PostMessage(self, cx: *mut JSContext, message: JSVal) {
let mut data = ptr::mut_null();
let mut nbytes = 0;
unsafe {
assert!(JS_WriteStructuredClone(cx, message, &mut data, &mut nbytes,
ptr::null(), ptr::mut_null()) != 0);
}
self.addref();
let ScriptChan(ref sender) = self.sender;
sender.send(DOMMessage(data, nbytes));
}
fn GetOnmessage(self) -> Option<EventHandlerNonNull> {
let eventtarget: JSRef<EventTarget> = EventTargetCast::from_ref(self);
eventtarget.get_event_handler_common("message")
}
fn SetOnmessage(self, listener: Option<EventHandlerNonNull>) {
let eventtarget: JSRef<EventTarget> = EventTargetCast::from_ref(self);
eventtarget.set_event_handler_common("message", listener)
}
}
impl Reflectable for Worker {
fn reflector<'a>(&'a self) -> &'a Reflector {
self.eventtarget.reflector()
}
}
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