Source/WebCore/bindings/js/JSDOMPromise.cpp

/*
 * Copyright (C) 2013, 2016 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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 *    notice, this list of conditions and the following disclaimer in the
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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 * 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 "JSDOMPromise.h"

#include "ExceptionCode.h"
#include "JSDOMError.h"
#include "JSDOMWindow.h"
#include <builtins/BuiltinNames.h>
#include <runtime/Exception.h>
#include <runtime/JSONObject.h>
#include <runtime/JSPromiseConstructor.h>

using namespace JSC;

namespace WebCore {

DeferredPromise::DeferredPromise(JSDOMGlobalObject& globalObject, JSPromiseDeferred& promiseDeferred)
    : ActiveDOMCallback(globalObject.scriptExecutionContext())
    , m_deferred(&promiseDeferred)
    , m_globalObject(&globalObject)
{
    globalObject.vm().heap.writeBarrier(&globalObject, &promiseDeferred);
    globalObject.deferredPromises().add(this);
}

DeferredPromise::~DeferredPromise()
{
    clear();
}

void DeferredPromise::clear()
{
    ASSERT(!m_deferred || m_globalObject);
    if (m_deferred && m_globalObject)
        m_globalObject->deferredPromises().remove(this);
    m_deferred.clear();
}

void DeferredPromise::contextDestroyed()
{
    ActiveDOMCallback::contextDestroyed();
    clear();
}

JSC::JSValue DeferredPromise::promise() const
{
    ASSERT(m_deferred);
    return m_deferred->promise();
}

void DeferredPromise::callFunction(ExecState& exec, JSValue function, JSValue resolution)
{
    if (!canInvokeCallback())
        return;

    CallData callData;
    CallType callType = getCallData(function, callData);
    ASSERT(callType != CallType::None);

    MarkedArgumentBuffer arguments;
    arguments.append(resolution);

    call(&exec, function, callType, callData, jsUndefined(), arguments);

    clear();
}

void DeferredPromise::reject(Exception&& exception)
{
    if (isSuspended())
        return;

    ASSERT(m_deferred);
    ASSERT(m_globalObject);
    auto& state = *m_globalObject->globalExec();
    JSC::JSLockHolder locker(&state);
    reject(state, createDOMException(state, WTFMove(exception)));
}

void DeferredPromise::reject(ExceptionCode ec, const String& message)
{
    if (isSuspended())
        return;

    ASSERT(m_deferred);
    ASSERT(m_globalObject);
    JSC::ExecState* state = m_globalObject->globalExec();
    JSC::JSLockHolder locker(state);
    reject(*state, createDOMException(state, ec, message));
}

void rejectPromiseWithExceptionIfAny(JSC::ExecState& state, JSDOMGlobalObject& globalObject, JSPromiseDeferred& promiseDeferred)
{
    VM& vm = state.vm();
    auto scope = DECLARE_CATCH_SCOPE(vm);

    if (LIKELY(!scope.exception()))
        return;

    JSValue error = scope.exception()->value();
    scope.clearException();

    DeferredPromise::create(globalObject, promiseDeferred)->reject(error);
}

Ref<DeferredPromise> createDeferredPromise(JSC::ExecState& state, JSDOMWindow& domWindow)
{
    JSC::JSPromiseDeferred* deferred = JSC::JSPromiseDeferred::create(&state, &domWindow);
    // deferred can only be null in workers.
    ASSERT(deferred);
    return DeferredPromise::create(domWindow, *deferred);
}

JSC::EncodedJSValue createRejectedPromiseWithTypeError(JSC::ExecState& state, const String& errorMessage)
{
    ASSERT(state.lexicalGlobalObject());
    auto& globalObject = *state.lexicalGlobalObject();

    auto promiseConstructor = globalObject.promiseConstructor();
    auto rejectFunction = promiseConstructor->get(&state, state.vm().propertyNames->builtinNames().rejectPrivateName());
    auto rejectionValue = createTypeError(&state, errorMessage);

    CallData callData;
    auto callType = getCallData(rejectFunction, callData);
    ASSERT(callType != CallType::None);

    MarkedArgumentBuffer arguments;
    arguments.append(rejectionValue);

    return JSValue::encode(call(&state, rejectFunction, callType, callData, promiseConstructor, arguments));
}

static inline JSC::JSValue parseAsJSON(JSC::ExecState* state, const String& data)
{
    JSC::JSLockHolder lock(state);
    return JSC::JSONParse(state, data);
}

void fulfillPromiseWithJSON(Ref<DeferredPromise>&& promise, const String& data)
{
    JSC::JSValue value = parseAsJSON(promise->globalObject()->globalExec(), data);
    if (!value)
        promise->reject(SYNTAX_ERR);
    else
        promise->resolve(value);
}

void fulfillPromiseWithArrayBuffer(Ref<DeferredPromise>&& promise, ArrayBuffer* arrayBuffer)
{
    if (!arrayBuffer) {
        promise->reject<JSValue>(createOutOfMemoryError(promise->globalObject()->globalExec()));
        return;
    }
    promise->resolve(arrayBuffer);
}

void fulfillPromiseWithArrayBuffer(Ref<DeferredPromise>&& promise, const void* data, size_t length)
{
    fulfillPromiseWithArrayBuffer(WTFMove(promise), ArrayBuffer::tryCreate(data, length).get());
}

}