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script: Move navigation fetching to the ScriptThread
(#34919)
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>
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16 changed files with 420 additions and 460 deletions
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@ -47,7 +47,7 @@ use media::WindowGLContext;
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use net_traits::image_cache::ImageCache;
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use net_traits::request::{Referrer, RequestBody};
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use net_traits::storage_thread::StorageType;
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use net_traits::{FetchResponseMsg, ReferrerPolicy, ResourceThreads};
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use net_traits::{ReferrerPolicy, ResourceThreads};
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use pixels::{Image, PixelFormat};
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use profile_traits::{mem, time as profile_time};
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use serde::{Deserialize, Deserializer, Serialize, Serializer};
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@ -286,16 +286,12 @@ pub enum UpdatePipelineIdReason {
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/// Messages sent from the constellation or layout to the script thread.
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// FIXME: https://github.com/servo/servo/issues/34591
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#[expect(clippy::large_enum_variant)]
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#[derive(Deserialize, Serialize)]
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pub enum ConstellationControlMsg {
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/// Takes the associated window proxy out of "delaying-load-events-mode",
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/// used if a scheduled navigated was refused by the embedder.
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/// <https://html.spec.whatwg.org/multipage/#delaying-load-events-mode>
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StopDelayingLoadEventsMode(PipelineId),
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/// Sends the final response to script thread for fetching after all redirections
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/// have been resolved
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NavigationResponse(PipelineId, FetchResponseMsg),
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/// Gives a channel and ID to a layout, as well as the ID of that layout's parent
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AttachLayout(NewLayoutInfo),
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/// Window resized. Sends a DOM event eventually, but first we combine events.
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@ -413,7 +409,6 @@ impl fmt::Debug for ConstellationControlMsg {
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use self::ConstellationControlMsg::*;
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let variant = match *self {
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StopDelayingLoadEventsMode(..) => "StopDelayingLoadsEventMode",
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NavigationResponse(..) => "NavigationResponse",
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AttachLayout(..) => "AttachLayout",
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Resize(..) => "Resize",
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ThemeChange(..) => "ThemeChange",
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