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/*
* Copyright (C) 2024 Keith Cirkel <webkit@keithcirkel.co.uk>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Subscriber.h"
#include "AbortSignal.h"
#include "Document.h"
#include "InternalObserver.h"
#include "JSDOMExceptionHandling.h"
#include "SubscriberCallback.h"
#include "SubscriptionObserverCallback.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
Ref<Subscriber> Subscriber::create(ScriptExecutionContext& context, Ref<InternalObserver>&& observer, const SubscribeOptions& options)
{
return adoptRef(*new Subscriber(context, WTFMove(observer), options));
}
Subscriber::Subscriber(ScriptExecutionContext& context, Ref<InternalObserver>&& observer, const SubscribeOptions& options)
: ActiveDOMObject(&context)
, m_signal(AbortSignal::create(&context))
, m_observer(observer)
, m_options(options)
{
followSignal(protectedSignal());
if (RefPtr signal = options.signal)
followSignal(*signal);
suspendIfNeeded();
}
void Subscriber::next(JSC::JSValue value)
{
if (!isActive())
return;
m_observer->next(value);
}
void Subscriber::error(JSC::JSValue error)
{
if (!m_active) {
reportErrorObject(error);
return;
}
if (isInactiveDocument())
return;
close(error);
m_observer->error(error);
}
void Subscriber::complete()
{
if (!isActive())
return;
close(JSC::jsUndefined());
m_observer->complete();
}
void Subscriber::addTeardown(Ref<VoidCallback> callback)
{
if (isInactiveDocument())
return;
if (m_active) {
Locker locker { m_teardownsLock };
m_teardowns.append(callback);
} else
callback->handleEvent();
}
void Subscriber::followSignal(AbortSignal& signal)
{
if (signal.aborted())
close(signal.reason().getValue());
else {
signal.addAlgorithm([this](JSC::JSValue reason) {
close(reason);
});
}
}
void Subscriber::close(JSC::JSValue reason)
{
if (!m_active || !scriptExecutionContext())
return;
m_active = false;
protectedSignal()->signalAbort(reason);
{
Locker locker { m_teardownsLock };
for (auto teardown = m_teardowns.rbegin(); teardown != m_teardowns.rend(); ++teardown) {
if (isInactiveDocument())
return;
(*teardown)->handleEvent();
}
}
stop();
}
bool Subscriber::isInactiveDocument() const
{
RefPtr document = dynamicDowncast<Document>(scriptExecutionContext());
return (document && !document->isFullyActive());
}
void Subscriber::reportErrorObject(JSC::JSValue value)
{
auto* context = scriptExecutionContext();
if (!context)
return;
auto* globalObject = context->globalObject();
if (!globalObject)
return;
Ref vm = globalObject->vm();
JSC::JSLockHolder lock(vm);
reportException(globalObject, JSC::Exception::create(vm, value));
}
Vector<VoidCallback*> Subscriber::teardownCallbacksConcurrently()
{
Locker locker { m_teardownsLock };
return m_teardowns.map([](auto& callback) {
return callback.ptr();
});
}
InternalObserver* Subscriber::observerConcurrently()
{
return &m_observer.get();
}
void Subscriber::visitAdditionalChildren(JSC::AbstractSlotVisitor& visitor)
{
for (auto* teardown : teardownCallbacksConcurrently())
teardown->visitJSFunction(visitor);
observerConcurrently()->visitAdditionalChildren(visitor);
}
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(Subscriber);
} // namespace WebCore
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