third_party/WebKit/Source/bindings/core/v8/V8WorkerGlobalScopeEventListener.cpp

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#include "bindings/core/v8/V8WorkerGlobalScopeEventListener.h"

#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8DOMWrapper.h"
#include "bindings/core/v8/V8Event.h"
#include "bindings/core/v8/V8EventTarget.h"
#include "bindings/core/v8/V8GCController.h"
#include "bindings/core/v8/V8ScriptRunner.h"
#include "bindings/core/v8/WorkerOrWorkletScriptController.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/inspector/InspectorTraceEvents.h"
#include "core/workers/WorkerGlobalScope.h"

namespace blink {

V8WorkerGlobalScopeEventListener::V8WorkerGlobalScopeEventListener(bool isInline, ScriptState* scriptState)
    : V8EventListener(isInline, scriptState)
{
}

void V8WorkerGlobalScopeEventListener::handleEvent(ScriptState* scriptState, Event* event)
{
    // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
    // See issue 889829.
    RefPtrWillBeRawPtr<V8AbstractEventListener> protect(this);

    WorkerOrWorkletScriptController* script = toWorkerGlobalScope(scriptState->executionContext())->script();
    if (!script)
        return;

    ScriptState::Scope scope(scriptState);

    // Get the V8 wrapper for the event object.
    v8::Local<v8::Value> jsEvent = toV8(event, scriptState->context()->Global(), isolate());
    if (jsEvent.IsEmpty())
        return;

    invokeEventHandler(scriptState, event, v8::Local<v8::Value>::New(isolate(), jsEvent));
}

v8::Local<v8::Value> V8WorkerGlobalScopeEventListener::callListenerFunction(ScriptState* scriptState, v8::Local<v8::Value> jsEvent, Event* event)
{
    ASSERT(!jsEvent.IsEmpty());
    v8::Local<v8::Function> handlerFunction = getListenerFunction(scriptState);
    v8::Local<v8::Object> receiver = getReceiverObject(scriptState, event);
    if (handlerFunction.IsEmpty() || receiver.IsEmpty())
        return v8::Local<v8::Value>();

    v8::Local<v8::Value> parameters[1] = { jsEvent };
    v8::MaybeLocal<v8::Value> maybeResult = V8ScriptRunner::callFunction(handlerFunction, scriptState->executionContext(), receiver, WTF_ARRAY_LENGTH(parameters), parameters, isolate());

    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "UpdateCounters", TRACE_EVENT_SCOPE_THREAD, "data", InspectorUpdateCountersEvent::data());

    v8::Local<v8::Value> result;
    if (!maybeResult.ToLocal(&result))
        return v8::Local<v8::Value>();
    return result;
}

// FIXME: Remove getReceiverObject().
// This is almost identical to V8AbstractEventListener::getReceiverObject().
v8::Local<v8::Object> V8WorkerGlobalScopeEventListener::getReceiverObject(ScriptState* scriptState, Event* event)
{
    v8::Local<v8::Object> listener = getListenerObject(scriptState->executionContext());

    if (!listener.IsEmpty() && !listener->IsFunction())
        return listener;

    EventTarget* target = event->currentTarget();
    v8::Local<v8::Value> value = toV8(target, scriptState->context()->Global(), isolate());
    if (value.IsEmpty())
        return v8::Local<v8::Object>();
    return v8::Local<v8::Object>::New(isolate(), v8::Local<v8::Object>::Cast(value));
}

} // namespace blink