ExtendableEvent.cpp   [plain text]

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
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 * 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
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#include "config.h"
#include "ExtendableEvent.h"

#if ENABLE(SERVICE_WORKER)

#include "JSDOMPromise.h"
#include "ScriptExecutionContext.h"
#include <JavaScriptCore/Microtask.h>

namespace WebCore {

ExtendableEvent::ExtendableEvent(const AtomicString& type, const ExtendableEventInit& initializer, IsTrusted isTrusted)
    : Event(type, initializer, isTrusted)
{
}

ExtendableEvent::ExtendableEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable)
    : Event(type, canBubble, cancelable)
{
}

ExtendableEvent::~ExtendableEvent()
{
}

// https://w3c.github.io/ServiceWorker/#dom-extendableevent-waituntil
ExceptionOr<void> ExtendableEvent::waitUntil(Ref<DOMPromise>&& promise)
{
    if (!isTrusted())
        return Exception { InvalidStateError, "Event is not trusted"_s };

    // If the pending promises count is zero and the dispatch flag is unset, throw an "InvalidStateError" DOMException.
    if (!m_pendingPromiseCount && !isBeingDispatched())
        return Exception { InvalidStateError, "Event is no longer being dispatched and has no pending promises"_s };

    addExtendLifetimePromise(WTFMove(promise));
    return { };
}

class FunctionMicrotask final : public JSC::Microtask {
public:
    static Ref<FunctionMicrotask> create(Function<void()>&& function)
    {
        return adoptRef(*new FunctionMicrotask(WTFMove(function)));
    }

private:
    explicit FunctionMicrotask(Function<void()>&& function)
        : m_function(WTFMove(function))
    {
    }

    void run(JSC::ExecState*) final
    {
        m_function();
    }

    Function<void()> m_function;
};

void ExtendableEvent::addExtendLifetimePromise(Ref<DOMPromise>&& promise)
{
    promise->whenSettled([this, protectedThis = makeRefPtr(this), settledPromise = promise.ptr()] () mutable {
        auto& globalObject = *settledPromise->globalObject();
        globalObject.queueMicrotask(FunctionMicrotask::create([this, protectedThis = WTFMove(protectedThis), settledPromise = WTFMove(settledPromise)] () mutable {
            --m_pendingPromiseCount;

            // FIXME: Let registration be the context object's relevant global object's associated service worker's containing service worker registration.
            // FIXME: If registration's uninstalling flag is set, invoke Try Clear Registration with registration.
            // FIXME: If registration is not null, invoke Try Activate with registration.

            auto* context = settledPromise->globalObject()->scriptExecutionContext();
            if (!context)
                return;
            context->postTask([this, protectedThis = WTFMove(protectedThis)] (ScriptExecutionContext&) mutable {
                if (m_pendingPromiseCount)
                    return;

                auto settledPromises = WTFMove(m_extendLifetimePromises);
                if (auto handler = WTFMove(m_whenAllExtendLifetimePromisesAreSettledHandler))
                    handler(WTFMove(settledPromises));
            });
        }));
    });

    m_extendLifetimePromises.add(WTFMove(promise));
    ++m_pendingPromiseCount;
}

void ExtendableEvent::whenAllExtendLifetimePromisesAreSettled(WTF::Function<void(HashSet<Ref<DOMPromise>>&&)>&& handler)
{
    ASSERT_WITH_MESSAGE(target(), "Event has not been dispatched yet");
    ASSERT(!m_whenAllExtendLifetimePromisesAreSettledHandler);

    if (!m_pendingPromiseCount) {
        handler(WTFMove(m_extendLifetimePromises));
        return;
    }

    m_whenAllExtendLifetimePromisesAreSettledHandler = WTFMove(handler);
}

} // namespace WebCore

#endif // ENABLE(SERVICE_WORKER)