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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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5
components/shared/script/script_msg.rs
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@ -17,7 +17,6 @@ use embedder_traits::{EmbedderMsg, MediaSessionEvent};
use euclid::default::Size2D as UntypedSize2D;
use euclid::Size2D;
use ipc_channel::ipc::{IpcReceiver, IpcSender};
use net_traits::request::RequestBuilder;
use net_traits::storage_thread::StorageType;
use net_traits::CoreResourceMsg;
use serde::{Deserialize, Serialize};
@ -128,9 +127,6 @@ pub enum ScriptMsg {
ScheduleBroadcast(BroadcastChannelRouterId, BroadcastMsg),
/// Forward a message to the embedder.
ForwardToEmbedder(EmbedderMsg),
/// Requests are sent to constellation and fetches are checked manually
/// for cross-origin loads
InitiateNavigateRequest(RequestBuilder, /* cancellation_chan */ IpcReceiver<()>),
/// Broadcast a storage event to every same-origin pipeline.
/// The strings are key, old value and new value.
BroadcastStorageEvent(
@ -271,7 +267,6 @@ impl fmt::Debug for ScriptMsg {
NewBroadcastChannelNameInRouter(..) => "NewBroadcastChannelNameInRouter",
ScheduleBroadcast(..) => "ScheduleBroadcast",
ForwardToEmbedder(..) => "ForwardToEmbedder",
InitiateNavigateRequest(..) => "InitiateNavigateRequest",
BroadcastStorageEvent(..) => "BroadcastStorageEvent",
ChangeRunningAnimationsState(..) => "ChangeRunningAnimationsState",
CreateCanvasPaintThread(..) => "CreateCanvasPaintThread",