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script: Add generic root storage to StructuredCloneReader. (#36640)

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This reduces the boilerplate necessary for adding new
serializable/transferable interfaces to the structured cloning code. We
always need to root the deserialized objects when performing a read
operation, but we don't actually need the concrete object types in the
majority of cases. By storing a list of rooted JS object values, we can
push generic reflector objects into it, and extract the types we need
(MessagePort) at the very end.

Testing: Existing WPT structured cloning tests will provide coverage.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-23 09:05:41 -04:00 • committed by GitHub
parent 7c1e5918a8
commit 5d3cbc67ee
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10 changed files with 73 additions and 126 deletions
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14
components/script/dom/blob.rs
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@ -24,9 +24,9 @@ use crate::dom::bindings::codegen::UnionTypes::ArrayBufferOrArrayBufferViewOrBlo
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::reflector::{DomGlobal, Reflector, reflect_dom_object_with_proto};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::serializable::{Serializable, StorageKey};
use crate::dom::bindings::serializable::Serializable;
use crate::dom::bindings::str::DOMString;
use crate::dom::bindings::structuredclone::{StructuredData, StructuredDataReader};
use crate::dom::bindings::structuredclone::StructuredData;
use crate::dom::globalscope::GlobalScope;
use crate::dom::promise::Promise;
use crate::dom::readablestream::ReadableStream;
@ -119,18 +119,14 @@ impl Serializable for Blob {
Ok(deserialized_blob)
}
fn serialized_storage(reader: StructuredData<'_>) -> &mut Option<HashMap<BlobId, Self::Data>> {
fn serialized_storage<'a>(
reader: StructuredData<'a, '_>,
) -> &'a mut Option<HashMap<BlobId, Self::Data>> {
match reader {
StructuredData::Reader(r) => &mut r.blob_impls,
StructuredData::Writer(w) => &mut w.blobs,
}
}
fn deserialized_storage(
data: &mut StructuredDataReader,
) -> &mut Option<HashMap<StorageKey, DomRoot<Self>>> {
&mut data.blobs
}
}
/// Extract bytes from BlobParts, used by Blob and File constructor