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net: Start reducing number of IPCs channels used for fetch with a FetchThread (#33863)

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Instead of creating a `ROUTER` for each fetch, create a fetch thread
which handles all incoming and outcoming fetch requests. Now messages
involving fetches carry a "request id" which indicates which fetch is
being addressed by the message. This greatly reduces the number of file
descriptors used by fetch.

In addition, the interface for kicking off fetches is simplified when
using the `Listener` with `Document`s and the `GlobalScope`.

This does not fix all leaked file descriptors / mach ports, but greatly
eliminates the number used. Now tests can be run without limiting
procesess on modern macOS systems.

Followup work:

1. There are more instances where fetch is done using the old method.
   Some of these require more changes in order to be converted to the
   `FetchThread` approach.
2. Eliminate usage of IPC channels when doing redirects.
3. Also eliminate the IPC channel used for cancel handling.
4. This change opens up the possiblity of controlling the priority of
   fetch requests.

Fixes #29834.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2024-10-16 09:53:24 -07:00 • committed by GitHub
parent 2115267328
commit 036e74524a
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31 changed files with 761 additions and 766 deletions
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15
components/script/dom/servoparser/mod.rs
View file

@ -21,6 +21,7 @@ use html5ever::tree_builder::{ElementFlags, NextParserState, NodeOrText, QuirksM
use html5ever::{local_name, namespace_url, ns, Attribute, ExpandedName, LocalName, QualName};
use hyper_serde::Serde;
use mime::{self, Mime};
use net_traits::request::RequestId;
use net_traits::{
FetchMetadata, FetchResponseListener, Metadata, NetworkError, ResourceFetchTiming,
ResourceTimingType,
@ -759,11 +760,11 @@ impl ParserContext {
}
impl FetchResponseListener for ParserContext {
fn process_request_body(&mut self) {}
fn process_request_body(&mut self, _: RequestId) {}
fn process_request_eof(&mut self) {}
fn process_request_eof(&mut self, _: RequestId) {}
fn process_response(&mut self, meta_result: Result<FetchMetadata, NetworkError>) {
fn process_response(&mut self, _: RequestId, meta_result: Result<FetchMetadata, NetworkError>) {
let (metadata, error) = match meta_result {
Ok(meta) => (
Some(match meta {
@ -914,7 +915,7 @@ impl FetchResponseListener for ParserContext {
}
}
fn process_response_chunk(&mut self, payload: Vec<u8>) {
fn process_response_chunk(&mut self, _: RequestId, payload: Vec<u8>) {
if self.is_synthesized_document {
return;
}
@ -932,7 +933,11 @@ impl FetchResponseListener for ParserContext {
// This method is called via script_thread::handle_fetch_eof, so we must call
// submit_resource_timing in this function
// Resource listeners are called via net_traits::Action::process, which handles submission for them
fn process_response_eof(&mut self, status: Result<ResourceFetchTiming, NetworkError>) {
fn process_response_eof(
&mut self,
_: RequestId,
status: Result<ResourceFetchTiming, NetworkError>,
) {
let parser = match self.parser.as_ref() {
Some(parser) => parser.root(),
None => return,