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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 https://mozilla.org/MPL/2.0/. */
use std::rc::Rc;
use ipc_channel::ipc::{self, IpcSender};
use ipc_channel::router::ROUTER;
use serde::Serialize;
use serde::de::DeserializeOwned;
use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
use crate::dom::bindings::reflector::{DomGlobal, DomObject};
use crate::dom::promise::Promise;
use crate::script_runtime::CanGc;
pub(crate) trait RoutedPromiseListener {
type Response: Serialize + DeserializeOwned + Send;
fn handle_response(&self, response: Self::Response, promise: &Rc<Promise>, can_gc: CanGc);
}
pub(crate) struct RoutedPromiseContext<T: RoutedPromiseListener + DomObject> {
trusted: TrustedPromise,
receiver: Trusted<T>,
}
impl<T: RoutedPromiseListener + DomObject> RoutedPromiseContext<T> {
#[cfg_attr(crown, allow(crown::unrooted_must_root))]
fn response(self, response: T::Response, can_gc: CanGc) {
let promise = self.trusted.root();
self.receiver
.root()
.handle_response(response, &promise, can_gc);
}
}
pub(crate) fn route_promise<T: RoutedPromiseListener + DomObject + 'static>(
promise: &Rc<Promise>,
receiver: &T,
) -> IpcSender<T::Response> {
let (action_sender, action_receiver) = ipc::channel().unwrap();
let task_source = receiver
.global()
.task_manager()
.dom_manipulation_task_source()
.to_sendable();
let mut trusted: Option<TrustedPromise> = Some(TrustedPromise::new(promise.clone()));
let trusted_receiver = Trusted::new(receiver);
ROUTER.add_typed_route(
action_receiver,
Box::new(move |message| {
let trusted = if let Some(trusted) = trusted.take() {
trusted
} else {
error!("RoutedPromiseListener callback called twice!");
return;
};
let context = RoutedPromiseContext {
trusted,
receiver: trusted_receiver.clone(),
};
task_source.queue(task!(routed_promise_task: move|| {
context.response(message.unwrap(), CanGc::note());
}));
}),
);
action_sender
}
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