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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/script/messaging.rs
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@ -13,6 +13,7 @@ use crossbeam_channel::{select, Receiver, SendError, Sender};
use devtools_traits::{DevtoolScriptControlMsg, ScriptToDevtoolsControlMsg};
use ipc_channel::ipc::IpcSender;
use net_traits::image_cache::PendingImageResponse;
use net_traits::FetchResponseMsg;
use profile_traits::mem::{self as profile_mem, OpaqueSender, ReportsChan};
use profile_traits::time::{self as profile_time};
use script_traits::{ConstellationControlMsg, LayoutMsg, Painter, ScriptMsg};
@ -49,7 +50,6 @@ impl MixedMessage {
match self {
MixedMessage::FromConstellation(ref inner_msg) => match *inner_msg {
ConstellationControlMsg::StopDelayingLoadEventsMode(id) => Some(id),
ConstellationControlMsg::NavigationResponse(id, _) => Some(id),
ConstellationControlMsg::AttachLayout(ref new_layout_info) => new_layout_info
.parent_info
.or(Some(new_layout_info.new_pipeline_id)),
@ -95,6 +95,7 @@ impl MixedMessage {
pipeline_id
},
MainThreadScriptMsg::Common(CommonScriptMsg::CollectReports(_)) => None,
MainThreadScriptMsg::NavigationResponse { pipeline_id, .. } => Some(pipeline_id),
MainThreadScriptMsg::WorkletLoaded(pipeline_id) => Some(pipeline_id),
MainThreadScriptMsg::RegisterPaintWorklet { pipeline_id, .. } => Some(pipeline_id),
MainThreadScriptMsg::Inactive => None,
@ -116,6 +117,10 @@ pub(crate) enum MainThreadScriptMsg {
/// Notifies the script thread that a new worklet has been loaded, and thus the page should be
/// reflowed.
WorkletLoaded(PipelineId),
NavigationResponse {
pipeline_id: PipelineId,
message: Box<FetchResponseMsg>,
},
/// Notifies the script thread that a new paint worklet has been registered.
RegisterPaintWorklet {
pipeline_id: PipelineId,