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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/. */
//! Infrastructure to initiate network requests for images needed by the layout
//! thread. The script thread needs to be responsible for them because there's
//! no guarantee that the responsible nodes will still exist in the future if the
//! layout thread holds on to them during asynchronous operations.
use crate::dom::bindings::reflector::DomObject;
use crate::dom::node::{document_from_node, Node};
use crate::network_listener::{NetworkListener, PreInvoke};
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use net_traits::image_cache::{ImageCache, PendingImageId};
use net_traits::request::{Destination, RequestInit as FetchRequestInit};
use net_traits::{FetchMetadata, FetchResponseListener, FetchResponseMsg, NetworkError};
use servo_url::ServoUrl;
use std::sync::{Arc, Mutex};
struct LayoutImageContext {
id: PendingImageId,
cache: Arc<dyn ImageCache>,
}
impl FetchResponseListener for LayoutImageContext {
fn process_request_body(&mut self) {}
fn process_request_eof(&mut self) {}
fn process_response(&mut self, metadata: Result<FetchMetadata, NetworkError>) {
self.cache
.notify_pending_response(self.id, FetchResponseMsg::ProcessResponse(metadata));
}
fn process_response_chunk(&mut self, payload: Vec<u8>) {
self.cache
.notify_pending_response(self.id, FetchResponseMsg::ProcessResponseChunk(payload));
}
fn process_response_eof(&mut self, response: Result<(), NetworkError>) {
self.cache
.notify_pending_response(self.id, FetchResponseMsg::ProcessResponseEOF(response));
}
}
impl PreInvoke for LayoutImageContext {}
pub fn fetch_image_for_layout(
url: ServoUrl,
node: &Node,
id: PendingImageId,
cache: Arc<dyn ImageCache>,
) {
let context = Arc::new(Mutex::new(LayoutImageContext {
id: id,
cache: cache,
}));
let document = document_from_node(node);
let (action_sender, action_receiver) = ipc::channel().unwrap();
let (task_source, canceller) = document
.window()
.task_manager()
.networking_task_source_with_canceller();
let listener = NetworkListener {
context,
task_source,
canceller: Some(canceller),
};
ROUTER.add_route(
action_receiver.to_opaque(),
Box::new(move |message| {
listener.notify_fetch(message.to().unwrap());
}),
);
let request = FetchRequestInit {
url: url,
origin: document.origin().immutable().clone(),
destination: Destination::Image,
pipeline_id: Some(document.global().pipeline_id()),
..FetchRequestInit::default()
};
// Layout image loads do not delay the document load event.
document
.loader_mut()
.fetch_async_background(request, action_sender);
}
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