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DOMRequest.cpp
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DOMRequest.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DOMRequest.h"
#include "mozilla/Util.h"
#include "nsDOMClassInfo.h"
#include "DOMError.h"
#include "nsEventDispatcher.h"
#include "nsDOMEvent.h"
#include "nsContentUtils.h"
#include "nsThreadUtils.h"
using mozilla::dom::DOMRequest;
using mozilla::dom::DOMRequestService;
DOMRequest::DOMRequest(nsIDOMWindow* aWindow)
: mResult(JSVAL_VOID)
, mDone(false)
, mRooted(false)
{
Init(aWindow);
}
// We need this constructor for dom::Activity that inherits from DOMRequest
// but has no window available from the constructor.
DOMRequest::DOMRequest()
: mResult(JSVAL_VOID)
, mDone(false)
, mRooted(false)
{
}
void
DOMRequest::Init(nsIDOMWindow* aWindow)
{
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aWindow);
BindToOwner(window->IsInnerWindow() ? window.get() :
window->GetCurrentInnerWindow());
}
DOMCI_DATA(DOMRequest, DOMRequest)
NS_IMPL_CYCLE_COLLECTION_CLASS(DOMRequest)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DOMRequest,
nsDOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mError)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DOMRequest,
nsDOMEventTargetHelper)
if (tmp->mRooted) {
tmp->mResult = JSVAL_VOID;
tmp->UnrootResultVal();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mError)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(DOMRequest,
nsDOMEventTargetHelper)
// Don't need NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER because
// nsDOMEventTargetHelper does it for us.
NS_IMPL_CYCLE_COLLECTION_TRACE_JSVAL_MEMBER_CALLBACK(mResult)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(DOMRequest)
NS_INTERFACE_MAP_ENTRY(nsIDOMDOMRequest)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(DOMRequest)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(DOMRequest, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(DOMRequest, nsDOMEventTargetHelper)
NS_IMPL_EVENT_HANDLER(DOMRequest, success)
NS_IMPL_EVENT_HANDLER(DOMRequest, error)
NS_IMETHODIMP
DOMRequest::GetReadyState(nsAString& aReadyState)
{
mDone ? aReadyState.AssignLiteral("done") :
aReadyState.AssignLiteral("pending");
return NS_OK;
}
NS_IMETHODIMP
DOMRequest::GetResult(jsval* aResult)
{
NS_ASSERTION(mDone || mResult == JSVAL_VOID,
"Result should be undefined when pending");
*aResult = mResult;
return NS_OK;
}
NS_IMETHODIMP
DOMRequest::GetError(nsIDOMDOMError** aError)
{
NS_ASSERTION(mDone || !mError,
"Error should be null when pending");
NS_IF_ADDREF(*aError = mError);
return NS_OK;
}
void
DOMRequest::FireSuccess(jsval aResult)
{
NS_ASSERTION(!mDone, "mDone shouldn't have been set to true already!");
NS_ASSERTION(!mError, "mError shouldn't have been set!");
NS_ASSERTION(mResult == JSVAL_VOID, "mResult shouldn't have been set!");
mDone = true;
if (JSVAL_IS_GCTHING(aResult)) {
RootResultVal();
}
mResult = aResult;
FireEvent(NS_LITERAL_STRING("success"), false, false);
}
void
DOMRequest::FireError(const nsAString& aError)
{
NS_ASSERTION(!mDone, "mDone shouldn't have been set to true already!");
NS_ASSERTION(!mError, "mError shouldn't have been set!");
NS_ASSERTION(mResult == JSVAL_VOID, "mResult shouldn't have been set!");
mDone = true;
mError = DOMError::CreateWithName(aError);
FireEvent(NS_LITERAL_STRING("error"), true, true);
}
void
DOMRequest::FireError(nsresult aError)
{
NS_ASSERTION(!mDone, "mDone shouldn't have been set to true already!");
NS_ASSERTION(!mError, "mError shouldn't have been set!");
NS_ASSERTION(mResult == JSVAL_VOID, "mResult shouldn't have been set!");
mDone = true;
mError = DOMError::CreateForNSResult(aError);
FireEvent(NS_LITERAL_STRING("error"), true, true);
}
void
DOMRequest::FireEvent(const nsAString& aType, bool aBubble, bool aCancelable)
{
if (NS_FAILED(CheckInnerWindowCorrectness())) {
return;
}
nsRefPtr<nsDOMEvent> event = new nsDOMEvent(nullptr, nullptr);
nsresult rv = event->InitEvent(aType, aBubble, aCancelable);
if (NS_FAILED(rv)) {
return;
}
rv = event->SetTrusted(true);
if (NS_FAILED(rv)) {
return;
}
bool dummy;
DispatchEvent(event, &dummy);
}
void
DOMRequest::RootResultVal()
{
NS_ASSERTION(!mRooted, "Don't call me if already rooted!");
nsXPCOMCycleCollectionParticipant *participant;
CallQueryInterface(this, &participant);
nsContentUtils::HoldJSObjects(NS_CYCLE_COLLECTION_UPCAST(this, DOMRequest),
participant);
mRooted = true;
}
void
DOMRequest::UnrootResultVal()
{
NS_ASSERTION(mRooted, "Don't call me if not rooted!");
NS_DROP_JS_OBJECTS(this, DOMRequest);
mRooted = false;
}
NS_IMPL_ISUPPORTS1(DOMRequestService, nsIDOMRequestService)
NS_IMETHODIMP
DOMRequestService::CreateRequest(nsIDOMWindow* aWindow,
nsIDOMDOMRequest** aRequest)
{
NS_ENSURE_STATE(aWindow);
NS_ADDREF(*aRequest = new DOMRequest(aWindow));
return NS_OK;
}
NS_IMETHODIMP
DOMRequestService::FireSuccess(nsIDOMDOMRequest* aRequest,
const jsval& aResult)
{
NS_ENSURE_STATE(aRequest);
static_cast<DOMRequest*>(aRequest)->FireSuccess(aResult);
return NS_OK;
}
NS_IMETHODIMP
DOMRequestService::FireError(nsIDOMDOMRequest* aRequest,
const nsAString& aError)
{
NS_ENSURE_STATE(aRequest);
static_cast<DOMRequest*>(aRequest)->FireError(aError);
return NS_OK;
}
class FireSuccessAsyncTask : public nsRunnable
{
public:
FireSuccessAsyncTask(DOMRequest* aRequest,
const jsval& aResult) :
mReq(aRequest),
mResult(aResult)
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
nsresult rv;
nsIScriptContext* sc = mReq->GetContextForEventHandlers(&rv);
MOZ_ASSERT(NS_SUCCEEDED(rv) && sc->GetNativeContext());
JSAutoRequest ar(sc->GetNativeContext());
JS_AddValueRoot(sc->GetNativeContext(), &mResult);
}
NS_IMETHODIMP
Run()
{
mReq->FireSuccess(mResult);
return NS_OK;
}
~FireSuccessAsyncTask()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
nsresult rv;
nsIScriptContext* sc = mReq->GetContextForEventHandlers(&rv);
MOZ_ASSERT(NS_SUCCEEDED(rv) && sc->GetNativeContext());
// We need to build a new request, otherwise we assert since there won't be
// a request available yet.
JSAutoRequest ar(sc->GetNativeContext());
JS_RemoveValueRoot(sc->GetNativeContext(), &mResult);
}
private:
nsRefPtr<DOMRequest> mReq;
jsval mResult;
};
class FireErrorAsyncTask : public nsRunnable
{
public:
FireErrorAsyncTask(DOMRequest* aRequest,
const nsAString& aError) :
mReq(aRequest),
mError(aError)
{
}
NS_IMETHODIMP
Run()
{
mReq->FireError(mError);
return NS_OK;
}
private:
nsRefPtr<DOMRequest> mReq;
nsString mError;
};
NS_IMETHODIMP
DOMRequestService::FireSuccessAsync(nsIDOMDOMRequest* aRequest,
const jsval& aResult)
{
NS_ENSURE_STATE(aRequest);
nsCOMPtr<nsIRunnable> asyncTask =
new FireSuccessAsyncTask(static_cast<DOMRequest*>(aRequest), aResult);
if (NS_FAILED(NS_DispatchToMainThread(asyncTask))) {
NS_WARNING("Failed to dispatch to main thread!");
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
DOMRequestService::FireErrorAsync(nsIDOMDOMRequest* aRequest,
const nsAString& aError)
{
NS_ENSURE_STATE(aRequest);
nsCOMPtr<nsIRunnable> asyncTask =
new FireErrorAsyncTask(static_cast<DOMRequest*>(aRequest), aError);
if (NS_FAILED(NS_DispatchToMainThread(asyncTask))) {
NS_WARNING("Failed to dispatch to main thread!");
return NS_ERROR_FAILURE;
}
return NS_OK;
}