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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 "Observable.h"
#include "AbortSignal.h"
#include "CallbackResult.h"
#include "Document.h"
#include "Exception.h"
#include "ExceptionCode.h"
#include "InternalObserverDrop.h"
#include "InternalObserverFilter.h"
#include "InternalObserverFromScript.h"
#include "InternalObserverMap.h"
#include "InternalObserverTake.h"
#include "JSSubscriptionObserverCallback.h"
#include "MapperCallback.h"
#include "PredicateCallback.h"
#include "SubscribeOptions.h"
#include "Subscriber.h"
#include "SubscriberCallback.h"
#include "SubscriptionObserver.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(Observable);
Ref<Observable> Observable::create(Ref<SubscriberCallback> callback)
{
return adoptRef(*new Observable(callback));
}
void Observable::subscribe(ScriptExecutionContext& context, std::optional<ObserverUnion> observer, SubscribeOptions options)
{
if (observer) {
WTF::switchOn(
observer.value(),
[&](RefPtr<JSSubscriptionObserverCallback>& next) {
subscribeInternal(context, InternalObserverFromScript::create(context, next), options);
},
[&](SubscriptionObserver& subscription) {
subscribeInternal(context, InternalObserverFromScript::create(context, subscription), options);
}
);
} else
subscribeInternal(context, InternalObserverFromScript::create(context, nullptr), options);
}
void Observable::subscribeInternal(ScriptExecutionContext& context, Ref<InternalObserver> observer, SubscribeOptions options)
{
RefPtr document = dynamicDowncast<Document>(context);
if (document && !document->isFullyActive())
return;
auto subscriber = Subscriber::create(context, observer);
if (options.signal)
subscriber->followSignal(*options.signal.get());
Ref vm = context.globalObject()->vm();
JSC::JSLockHolder lock(vm);
// The exception is not reported, instead it is forwarded to the
// error handler. As such, SusbcribeCallback `[RethrowsException]` and
// here a catch scope is declared so the error can be passed to the
// subscription error handler.
JSC::Exception* previousException = nullptr;
{
auto catchScope = DECLARE_CATCH_SCOPE(vm);
m_subscriberCallback->handleEvent(subscriber);
previousException = catchScope.exception();
if (previousException) {
catchScope.clearException();
subscriber->error(previousException->value());
}
}
}
Ref<Observable> Observable::map(ScriptExecutionContext& context, MapperCallback& mapper)
{
return create(createSubscriberCallbackMap(context, *this, mapper));
}
Ref<Observable> Observable::filter(ScriptExecutionContext& context, PredicateCallback& predicate)
{
return create(createSubscriberCallbackFilter(context, *this, predicate));
}
Ref<Observable> Observable::take(ScriptExecutionContext& context, uint64_t amount)
{
return create(createSubscriberCallbackTake(context, *this, amount));
}
Ref<Observable> Observable::drop(ScriptExecutionContext& context, uint64_t amount)
{
return create(createSubscriberCallbackDrop(context, *this, amount));
}
Observable::Observable(Ref<SubscriberCallback> callback)
: m_subscriberCallback(callback)
{
}
} // namespace WebCore
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