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use pin_project_lite::pin_project;
use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::sync::{mpsc, oneshot};
use crate::handler::target::TargetMessage;
use crate::{error::Result, ArcHttpRequest};
/// Convenience alias for sending messages to a Target task/actor.
///
/// This channel is typically owned by the Target event loop and accepts
/// `TargetMessage` commands to be processed serially.
type TargetSender = mpsc::Sender<TargetMessage>;
pin_project! {
pub struct TargetMessageFuture<T> {
#[pin]
rx_request: oneshot::Receiver<T>,
target_sender: mpsc::Sender<TargetMessage>,
message: Option<TargetMessage>,
}
}
impl<T> TargetMessageFuture<T> {
pub fn new(
target_sender: TargetSender,
message: TargetMessage,
rx_request: oneshot::Receiver<T>,
) -> Self {
Self {
target_sender,
rx_request,
message: Some(message),
}
}
/// Helper to build a `TargetMessageFuture<ArcHttpRequest>` for any
/// "wait" style target message (navigation, network idle, etc.).
///
/// The `make_msg` closure receives the `oneshot::Sender<ArcHttpRequest>` and
/// must wrap it into the appropriate `TargetMessage` variant
/// (e.g. `TargetMessage::WaitForNavigation(tx)`).
pub(crate) fn wait(
target_sender: TargetSender,
make_msg: impl FnOnce(oneshot::Sender<ArcHttpRequest>) -> TargetMessage,
) -> TargetMessageFuture<ArcHttpRequest> {
let (tx, rx_request) = oneshot::channel();
let message = make_msg(tx);
TargetMessageFuture::new(target_sender, message, rx_request)
}
/// Wait for the main-frame navigation to finish.
///
/// This triggers a `TargetMessage::WaitForNavigation` and resolves with
/// the final `ArcHttpRequest` associated with that navigation (if any).
pub fn wait_for_navigation(target_sender: TargetSender) -> TargetMessageFuture<ArcHttpRequest> {
Self::wait(target_sender, TargetMessage::WaitForNavigation)
}
/// Wait until the main frame reaches `networkIdle`.
///
/// This triggers a `TargetMessage::WaitForNetworkIdle` and resolves with
/// the `ArcHttpRequest` associated with the navigation that led to the
/// idle state (if any).
pub fn wait_for_network_idle(
target_sender: TargetSender,
) -> TargetMessageFuture<ArcHttpRequest> {
Self::wait(target_sender, TargetMessage::WaitForNetworkIdle)
}
/// Wait until the main frame reaches `networkAlmostIdle`.
///
/// This triggers a `TargetMessage::WaitForNetworkAlmostIdle` and resolves
/// with the `ArcHttpRequest` associated with that navigation (if any).
pub fn wait_for_network_almost_idle(
target_sender: TargetSender,
) -> TargetMessageFuture<ArcHttpRequest> {
Self::wait(target_sender, TargetMessage::WaitForNetworkAlmostIdle)
}
}
impl<T> Future for TargetMessageFuture<T> {
type Output = Result<T>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.project();
if this.message.is_some() {
let message = this.message.take().expect("existence checked above");
match this.target_sender.try_send(message) {
Ok(()) => {
cx.waker().wake_by_ref();
Poll::Pending
}
Err(tokio::sync::mpsc::error::TrySendError::Full(msg)) => {
*this.message = Some(msg);
cx.waker().wake_by_ref();
Poll::Pending
}
Err(e) => Poll::Ready(Err(e.into())),
}
} else {
this.rx_request.as_mut().poll(cx).map_err(Into::into)
}
}
}