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/*
* Copyright (C) 2024 Marais Rossouw <me@marais.co>. 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 "InternalObserverFirst.h"
#include "AbortSignal.h"
#include "Exception.h"
#include "ExceptionCode.h"
#include "InternalObserver.h"
#include "JSDOMPromiseDeferred.h"
#include "Observable.h"
#include "ScriptExecutionContext.h"
#include "SubscribeOptions.h"
#include "Subscriber.h"
#include "SubscriberCallback.h"
#include <JavaScriptCore/JSCJSValueInlines.h>
namespace WebCore {
class InternalObserverFirst final : public InternalObserver {
public:
static Ref<InternalObserverFirst> create(ScriptExecutionContext& context, Ref<AbortSignal>&& signal, Ref<DeferredPromise>&& promise)
{
Ref internalObserver = adoptRef(*new InternalObserverFirst(context, WTFMove(signal), WTFMove(promise)));
internalObserver->suspendIfNeeded();
return internalObserver;
}
private:
void next(JSC::JSValue value) final
{
protectedPromise()->resolve<IDLAny>(value);
Ref { m_signal }->signalAbort(JSC::jsUndefined());
}
void error(JSC::JSValue value) final
{
protectedPromise()->reject<IDLAny>(value);
}
void complete() final
{
InternalObserver::complete();
protectedPromise()->reject(Exception { ExceptionCode::RangeError, "No values in Observable"_s });
}
void visitAdditionalChildren(JSC::AbstractSlotVisitor&) const final
{
}
Ref<DeferredPromise> protectedPromise() const { return m_promise; }
InternalObserverFirst(ScriptExecutionContext& context, Ref<AbortSignal>&& signal, Ref<DeferredPromise>&& promise)
: InternalObserver(context)
, m_signal(WTFMove(signal))
, m_promise(WTFMove(promise))
{
}
const Ref<AbortSignal> m_signal;
const Ref<DeferredPromise> m_promise;
};
void createInternalObserverOperatorFirst(ScriptExecutionContext& context, Observable& observable, const SubscribeOptions& options, Ref<DeferredPromise>&& promise)
{
Ref signal = AbortSignal::create(&context);
Vector<Ref<AbortSignal>> dependentSignals = { signal };
if (options.signal)
dependentSignals.append(Ref { *options.signal });
Ref dependentSignal = AbortSignal::any(context, dependentSignals);
if (dependentSignal->aborted())
return promise->reject<IDLAny>(dependentSignal->reason().getValue());
dependentSignal->addAlgorithm([promise](JSC::JSValue reason) {
promise->reject<IDLAny>(reason);
});
Ref observer = InternalObserverFirst::create(context, WTFMove(signal), WTFMove(promise));
observable.subscribeInternal(context, WTFMove(observer), SubscribeOptions { .signal = WTFMove(dependentSignal) });
}
} // namespace WebCore
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