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LibWeb: Propagate OOM in Body::fully_read() through its error callback

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Fetched bodies can be on the order of gigabytes, so rather than crashing
when we hit OOM here, we can simply invoke the error callback with a DOM
exception. We use "UnknownError" here as the spec directly supports this
for OOM errors:

    UnknownError: The operation failed for an unknown transient reason
                  (e.g. out of memory).

This is still an ad-hoc implementation. We should be using streams, and
we do have the AOs available to do so. But they need to be massaged to
be compatible with callers of Body::fully_read. And once we do use
streams, this function will become infallible - so making it infallible
here is at least a step in the right direction.
This commit is contained in:
Timothy Flynn
2024-04-26 14:57:40 -04:00
committed by Andreas Kling
parent ec5988d56b
commit 1ffda6a805
10 changed files with 39 additions and 42 deletions
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14
Userland/Libraries/LibWeb/Fetch/Fetching/Fetching.cpp
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@@ -495,7 +495,7 @@ WebIDL::ExceptionOr<JS::GCPtr<PendingResponse>> main_fetch(JS::Realm& realm, Inf
// 1. Let processBodyError be this step: run fetch response handover given fetchParams and a network
// error.
auto process_body_error = JS::create_heap_function(vm.heap(), [&realm, &vm, &fetch_params](JS::GCPtr<WebIDL::DOMException>) {
TRY_OR_IGNORE(fetch_response_handover(realm, fetch_params, Infrastructure::Response::network_error(vm, "Response body could not be processed"sv)));
fetch_response_handover(realm, fetch_params, Infrastructure::Response::network_error(vm, "Response body could not be processed"sv));
});
// 2. If response’s body is null, then run processBodyError and abort these steps.
@@ -516,15 +516,15 @@ WebIDL::ExceptionOr<JS::GCPtr<PendingResponse>> main_fetch(JS::Realm& realm, Inf
response->set_body(TRY_OR_IGNORE(Infrastructure::byte_sequence_as_body(realm, bytes)));
// 3. Run fetch response handover given fetchParams and response.
TRY_OR_IGNORE(fetch_response_handover(realm, fetch_params, *response));
fetch_response_handover(realm, fetch_params, *response);
});
// 4. Fully read response’s body given processBody and processBodyError.
TRY_OR_IGNORE(response->body()->fully_read(realm, move(process_body), move(process_body_error), fetch_params.task_destination()));
response->body()->fully_read(realm, process_body, process_body_error, fetch_params.task_destination());
}
// 23. Otherwise, run fetch response handover given fetchParams and response.
else {
TRY_OR_IGNORE(fetch_response_handover(realm, fetch_params, *response));
fetch_response_handover(realm, fetch_params, *response);
}
});
});
@@ -533,7 +533,7 @@ WebIDL::ExceptionOr<JS::GCPtr<PendingResponse>> main_fetch(JS::Realm& realm, Inf
}
// https://fetch.spec.whatwg.org/#fetch-finale
WebIDL::ExceptionOr<void> fetch_response_handover(JS::Realm& realm, Infrastructure::FetchParams const& fetch_params, Infrastructure::Response& response)
void fetch_response_handover(JS::Realm& realm, Infrastructure::FetchParams const& fetch_params, Infrastructure::Response& response)
{
dbgln_if(WEB_FETCH_DEBUG, "Fetch: Running 'fetch response handover' with: fetch_params @ {}, response @ {}", &fetch_params, &response);
@@ -681,11 +681,9 @@ WebIDL::ExceptionOr<void> fetch_response_handover(JS::Realm& realm, Infrastructu
// 4. Otherwise, fully read internalResponse body given processBody, processBodyError, and fetchParams’s task
// destination.
else {
TRY(internal_response->body()->fully_read(realm, process_body, process_body_error, fetch_params.task_destination()));
internal_response->body()->fully_read(realm, process_body, process_body_error, fetch_params.task_destination());
}
}
return {};
}
// https://fetch.spec.whatwg.org/#concept-scheme-fetch