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script: Move navigation fetching to the ScriptThread (#34919)

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This allows reusing the asynchrnous fetch mechanism that we use for page
resources and is likely a step toward removing the `FetchThread`.

Benefits:
 - Reduces IPC traffic during navigation. Now instead of bouncing
   between the constellation and the `ScriptThread` responses are sent
   directly to the `ScriptThread`.
 - Allows cancelling loads after redirects, which was not possible
   before.

There is the question of what to do when a redirect is cross-origin
(#23037). This currently isn't handled properly as the `Constellation`
sends data to the same `Pipeline` that initiated the load. This change
doesn't fix this issue, but does make it more possible for the
`ScriptThread` to shut down the pipeline and ask the `Constellation` to
replace it with a new one.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-01-10 13:19:40 +01:00 • committed by GitHub
parent 73c0701c83
commit fbd77b4524
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16 changed files with 420 additions and 460 deletions
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7
components/shared/script/lib.rs
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@ -47,7 +47,7 @@ use media::WindowGLContext;
use net_traits::image_cache::ImageCache;
use net_traits::request::{Referrer, RequestBody};
use net_traits::storage_thread::StorageType;
use net_traits::{FetchResponseMsg, ReferrerPolicy, ResourceThreads};
use net_traits::{ReferrerPolicy, ResourceThreads};
use pixels::{Image, PixelFormat};
use profile_traits::{mem, time as profile_time};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
@ -286,16 +286,12 @@ pub enum UpdatePipelineIdReason {
/// Messages sent from the constellation or layout to the script thread.
// FIXME: https://github.com/servo/servo/issues/34591
#[expect(clippy::large_enum_variant)]
#[derive(Deserialize, Serialize)]
pub enum ConstellationControlMsg {
/// Takes the associated window proxy out of "delaying-load-events-mode",
/// used if a scheduled navigated was refused by the embedder.
/// <https://html.spec.whatwg.org/multipage/#delaying-load-events-mode>
StopDelayingLoadEventsMode(PipelineId),
/// Sends the final response to script thread for fetching after all redirections
/// have been resolved
NavigationResponse(PipelineId, FetchResponseMsg),
/// Gives a channel and ID to a layout, as well as the ID of that layout's parent
AttachLayout(NewLayoutInfo),
/// Window resized. Sends a DOM event eventually, but first we combine events.
@ -413,7 +409,6 @@ impl fmt::Debug for ConstellationControlMsg {
use self::ConstellationControlMsg::*;
let variant = match *self {
StopDelayingLoadEventsMode(..) => "StopDelayingLoadsEventMode",
NavigationResponse(..) => "NavigationResponse",
AttachLayout(..) => "AttachLayout",
Resize(..) => "Resize",
ThemeChange(..) => "ThemeChange",