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/*
* Copyright (C) 2017-2023 Apple Inc. 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 "AbortSignal.h"
#include "AbortAlgorithm.h"
#include "DOMException.h"
#include "DOMTimer.h"
#include "Event.h"
#include "EventNames.h"
#include "JSDOMException.h"
#include "ScriptExecutionContext.h"
#include "WebCoreOpaqueRoot.h"
#include <JavaScriptCore/Exception.h>
#include <JavaScriptCore/JSCast.h>
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(AbortSignal);
Ref<AbortSignal> AbortSignal::create(ScriptExecutionContext* context)
{
return adoptRef(*new AbortSignal(context));
}
// https://dom.spec.whatwg.org/#dom-abortsignal-abort
Ref<AbortSignal> AbortSignal::abort(JSDOMGlobalObject& globalObject, ScriptExecutionContext& context, JSC::JSValue reason)
{
ASSERT(reason);
if (reason.isUndefined())
reason = toJS(&globalObject, &globalObject, DOMException::create(AbortError));
return adoptRef(*new AbortSignal(&context, Aborted::Yes, reason));
}
// https://dom.spec.whatwg.org/#dom-abortsignal-timeout
Ref<AbortSignal> AbortSignal::timeout(ScriptExecutionContext& context, uint64_t milliseconds)
{
auto signal = adoptRef(*new AbortSignal(&context));
signal->setHasActiveTimeoutTimer(true);
auto action = [signal](ScriptExecutionContext& context) mutable {
signal->setHasActiveTimeoutTimer(false);
auto* globalObject = JSC::jsCast<JSDOMGlobalObject*>(context.globalObject());
if (!globalObject)
return;
auto& vm = globalObject->vm();
Locker locker { vm.apiLock() };
signal->signalAbort(toJS(globalObject, globalObject, DOMException::create(TimeoutError)));
};
DOMTimer::install(context, WTFMove(action), Seconds::fromMilliseconds(milliseconds), DOMTimer::Type::SingleShot);
return signal;
}
Ref<AbortSignal> AbortSignal::any(ScriptExecutionContext& context, const Vector<RefPtr<AbortSignal>>& signals)
{
auto resultSignal = adoptRef(*new AbortSignal(&context));
auto abortedSignalIndex = signals.findIf([](auto& signal) { return signal->aborted(); });
if (abortedSignalIndex != notFound) {
resultSignal->signalAbort(signals[abortedSignalIndex]->reason().getValue());
return resultSignal;
}
resultSignal->markAsDependent();
for (auto& signal : signals)
resultSignal->addSourceSignal(*signal);
return resultSignal;
}
AbortSignal::AbortSignal(ScriptExecutionContext* context, Aborted aborted, JSC::JSValue reason)
: ContextDestructionObserver(context)
, m_reason(reason)
, m_aborted(aborted == Aborted::Yes)
{
ASSERT(reason);
}
AbortSignal::~AbortSignal() = default;
void AbortSignal::addSourceSignal(AbortSignal& signal)
{
if (signal.isDependent()) {
for (auto& sourceSignal : signal.sourceSignals())
addSourceSignal(sourceSignal);
return;
}
ASSERT(!signal.aborted());
ASSERT(signal.sourceSignals().isEmptyIgnoringNullReferences());
m_sourceSignals.add(signal);
signal.addDependentSignal(*this);
}
void AbortSignal::addDependentSignal(AbortSignal& signal)
{
m_dependentSignals.add(signal);
}
// https://dom.spec.whatwg.org/#abortsignal-signal-abort
void AbortSignal::signalAbort(JSC::JSValue reason)
{
// 1. If signal's aborted flag is set, then return.
if (m_aborted)
return;
// 2. Set signal’s aborted flag.
m_aborted = true;
m_sourceSignals.clear();
// FIXME: This code is wrong: we should emit a write-barrier. Otherwise, GC can collect it.
// https://bugs.webkit.org/show_bug.cgi?id=236353
ASSERT(reason);
m_reason.setWeakly(reason);
Ref protectedThis { *this };
auto algorithms = std::exchange(m_algorithms, { });
for (auto& algorithm : algorithms)
algorithm.second(reason);
// 5. Fire an event named abort at signal.
dispatchEvent(Event::create(eventNames().abortEvent, Event::CanBubble::No, Event::IsCancelable::No));
for (auto& dependentSignal : std::exchange(m_dependentSignals, { }))
Ref { dependentSignal }->signalAbort(reason);
}
// https://dom.spec.whatwg.org/#abortsignal-follow
void AbortSignal::signalFollow(AbortSignal& signal)
{
if (aborted())
return;
if (signal.aborted()) {
signalAbort(signal.reason().getValue());
return;
}
ASSERT(!m_followingSignal);
m_followingSignal = signal;
signal.addAlgorithm([weakThis = WeakPtr<AbortSignal, WeakPtrImplWithEventTargetData> { this }](JSC::JSValue reason) {
if (weakThis)
weakThis->signalAbort(reason);
});
}
void AbortSignal::eventListenersDidChange()
{
m_hasAbortEventListener = hasEventListeners(eventNames().abortEvent);
}
uint32_t AbortSignal::addAbortAlgorithmToSignal(AbortSignal& signal, Ref<AbortAlgorithm>&& algorithm)
{
if (signal.aborted()) {
algorithm->handleEvent(signal.m_reason.getValue());
return 0;
}
return signal.addAlgorithm([algorithm = WTFMove(algorithm)](JSC::JSValue value) mutable {
algorithm->handleEvent(value);
});
}
void AbortSignal::removeAbortAlgorithmFromSignal(AbortSignal& signal, uint32_t algorithmIdentifier)
{
signal.removeAlgorithm(algorithmIdentifier);
}
uint32_t AbortSignal::addAlgorithm(Algorithm&& algorithm)
{
m_algorithms.append(std::make_pair(++m_algorithmIdentifier, WTFMove(algorithm)));
return m_algorithmIdentifier;
}
void AbortSignal::removeAlgorithm(uint32_t algorithmIdentifier)
{
m_algorithms.removeFirstMatching([algorithmIdentifier](auto& pair) {
return pair.first == algorithmIdentifier;
});
}
void AbortSignal::throwIfAborted(JSC::JSGlobalObject& lexicalGlobalObject)
{
if (!aborted())
return;
auto& vm = lexicalGlobalObject.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
throwException(&lexicalGlobalObject, scope, m_reason.getValue());
}
WebCoreOpaqueRoot root(AbortSignal* signal)
{
return WebCoreOpaqueRoot { signal };
}
} // namespace WebCore
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