script/
routed_promise.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use js::context::JSContext;
6use script_bindings::reflector::DomObject;
7pub(crate) use script_bindings::routed_promise::RoutedPromiseListener;
8use serde::Serialize;
9use serde::de::DeserializeOwned;
10use servo_base::generic_channel::GenericCallback;
11
12use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
13use crate::dom::promise::RootedPromise;
14use crate::tasks::task_source::TaskSource;
15
16pub(crate) struct RoutedPromiseContext<
17    R: Serialize + DeserializeOwned + Send,
18    T: RoutedPromiseListener<crate::DomTypeHolder, R> + DomObject,
19> {
20    trusted: TrustedPromise,
21    receiver: Trusted<T>,
22    _phantom: std::marker::PhantomData<R>,
23}
24
25impl<
26    R: Serialize + DeserializeOwned + Send,
27    T: RoutedPromiseListener<crate::DomTypeHolder, R> + DomObject,
28> RoutedPromiseContext<R, T>
29{
30    fn response(self, cx: &mut JSContext, response: R) {
31        let promise = self.trusted.root(cx);
32        self.receiver.root().handle_response(cx, response, &promise);
33    }
34}
35
36pub(crate) fn callback_promise<
37    R: Serialize + DeserializeOwned + Send + 'static,
38    T: RoutedPromiseListener<crate::DomTypeHolder, R> + DomObject + 'static,
39>(
40    promise: &RootedPromise,
41    receiver: &T,
42    task_source: TaskSource,
43) -> GenericCallback<R> {
44    let task_source = task_source.to_sendable();
45    let mut trusted: Option<TrustedPromise> = Some(TrustedPromise::from(promise));
46    let trusted_receiver = Trusted::new(receiver);
47    GenericCallback::new(move |message| {
48        let trusted = if let Some(trusted) = trusted.take() {
49            trusted
50        } else {
51            error!("RoutedPromiseListener callback called twice!");
52            return;
53        };
54
55        let context = RoutedPromiseContext {
56            trusted,
57            receiver: trusted_receiver.clone(),
58            _phantom: Default::default(),
59        };
60        task_source.queue(task!(routed_promise_task: move|cx| {
61            context.response(cx, message.unwrap());
62        }));
63    })
64    .expect("Could not create callback in script.")
65}
script/routed_promise.rs

script/
routed_promise.rs
