gecko-dev/dom/base/DOMRequest.cpp

313 строки
8.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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 "DOMException.h"
#include "nsThreadUtils.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ScriptSettings.h"
#include "jsfriendapi.h"
#include "nsContentUtils.h"
using mozilla::dom::AnyCallback;
using mozilla::dom::DOMException;
using mozilla::dom::DOMRequest;
using mozilla::dom::DOMRequestService;
using mozilla::dom::Promise;
using mozilla::dom::AutoJSAPI;
using mozilla::dom::RootingCx;
DOMRequest::DOMRequest(nsPIDOMWindowInner* aWindow)
: DOMEventTargetHelper(aWindow)
, mResult(JS::UndefinedValue())
, mDone(false)
{
}
DOMRequest::DOMRequest(nsIGlobalObject* aGlobal)
: DOMEventTargetHelper(aGlobal)
, mResult(JS::UndefinedValue())
, mDone(false)
{
}
DOMRequest::~DOMRequest()
{
mResult.setUndefined();
mozilla::DropJSObjects(this);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(DOMRequest)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DOMRequest,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mError)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPromise)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DOMRequest,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mError)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPromise)
tmp->mResult.setUndefined();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(DOMRequest,
DOMEventTargetHelper)
// Don't need NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER because
// DOMEventTargetHelper does it for us.
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mResult)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMRequest)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(DOMRequest, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(DOMRequest, DOMEventTargetHelper)
/* virtual */ JSObject*
DOMRequest::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return DOMRequest_Binding::Wrap(aCx, this, aGivenProto);
}
void
DOMRequest::FireSuccess(JS::Handle<JS::Value> 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.isUndefined(), "mResult shouldn't have been set!");
mDone = true;
if (aResult.isGCThing()) {
RootResultVal();
}
mResult = aResult;
FireEvent(NS_LITERAL_STRING("success"), false, false);
if (mPromise) {
mPromise->MaybeResolve(mResult);
}
}
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.isUndefined(), "mResult shouldn't have been set!");
mDone = true;
// XXX Error code chosen arbitrarily
mError = DOMException::Create(NS_ERROR_DOM_UNKNOWN_ERR,
NS_ConvertUTF16toUTF8(aError));
FireEvent(NS_LITERAL_STRING("error"), true, true);
if (mPromise) {
mPromise->MaybeRejectBrokenly(mError);
}
}
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.isUndefined(), "mResult shouldn't have been set!");
mDone = true;
mError = DOMException::Create(aError);
FireEvent(NS_LITERAL_STRING("error"), true, true);
if (mPromise) {
mPromise->MaybeRejectBrokenly(mError);
}
}
void
DOMRequest::FireDetailedError(DOMException& 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.isUndefined(), "mResult shouldn't have been set!");
mDone = true;
mError = &aError;
FireEvent(NS_LITERAL_STRING("error"), true, true);
if (mPromise) {
mPromise->MaybeRejectBrokenly(mError);
}
}
void
DOMRequest::FireEvent(const nsAString& aType, bool aBubble, bool aCancelable)
{
if (NS_FAILED(CheckInnerWindowCorrectness())) {
return;
}
RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
event->InitEvent(aType, aBubble, aCancelable);
event->SetTrusted(true);
DispatchEvent(*event);
}
void
DOMRequest::RootResultVal()
{
mozilla::HoldJSObjects(this);
}
void
DOMRequest::Then(JSContext* aCx, AnyCallback* aResolveCallback,
AnyCallback* aRejectCallback,
JS::MutableHandle<JS::Value> aRetval,
mozilla::ErrorResult& aRv)
{
if (!mPromise) {
mPromise = Promise::Create(DOMEventTargetHelper::GetParentObject(), aRv);
if (aRv.Failed()) {
return;
}
if (mDone) {
// Since we create mPromise lazily, it's possible that the DOMRequest object
// has already fired its success/error event. In that case we should
// manually resolve/reject mPromise here. mPromise will take care of
// calling the callbacks on |promise| as needed.
if (mError) {
mPromise->MaybeRejectBrokenly(mError);
} else {
mPromise->MaybeResolve(mResult);
}
}
}
// Just use the global of the Promise itself as the callee global.
JS::Rooted<JSObject*> global(aCx, mPromise->PromiseObj());
global = JS::GetNonCCWObjectGlobal(global);
mPromise->Then(aCx, global, aResolveCallback, aRejectCallback, aRetval, aRv);
}
NS_IMPL_ISUPPORTS(DOMRequestService, nsIDOMRequestService)
NS_IMETHODIMP
DOMRequestService::CreateRequest(mozIDOMWindow* aWindow,
DOMRequest** aRequest)
{
MOZ_ASSERT(NS_IsMainThread());
NS_ENSURE_STATE(aWindow);
auto* win = nsPIDOMWindowInner::From(aWindow);
RefPtr<DOMRequest> req = new DOMRequest(win);
req.forget(aRequest);
return NS_OK;
}
NS_IMETHODIMP
DOMRequestService::FireSuccess(DOMRequest* aRequest,
JS::Handle<JS::Value> aResult)
{
NS_ENSURE_STATE(aRequest);
aRequest->FireSuccess(aResult);
return NS_OK;
}
NS_IMETHODIMP
DOMRequestService::FireError(DOMRequest* aRequest,
const nsAString& aError)
{
NS_ENSURE_STATE(aRequest);
aRequest->FireError(aError);
return NS_OK;
}
class FireSuccessAsyncTask : public mozilla::Runnable
{
FireSuccessAsyncTask(DOMRequest* aRequest, const JS::Value& aResult)
: mozilla::Runnable("FireSuccessAsyncTask")
, mReq(aRequest)
, mResult(RootingCx(), aResult)
{
}
public:
// Due to the fact that initialization can fail during shutdown (since we
// can't fetch a js context), set up an initiatization function to make sure
// we can return the failure appropriately
static nsresult
Dispatch(DOMRequest* aRequest,
const JS::Value& aResult)
{
RefPtr<FireSuccessAsyncTask> asyncTask =
new FireSuccessAsyncTask(aRequest, aResult);
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(asyncTask));
return NS_OK;
}
NS_IMETHOD
Run() override
{
mReq->FireSuccess(JS::Handle<JS::Value>::fromMarkedLocation(mResult.address()));
return NS_OK;
}
private:
RefPtr<DOMRequest> mReq;
JS::PersistentRooted<JS::Value> mResult;
};
class FireErrorAsyncTask : public mozilla::Runnable
{
public:
FireErrorAsyncTask(DOMRequest* aRequest, const nsAString& aError)
: mozilla::Runnable("FireErrorAsyncTask")
, mReq(aRequest)
, mError(aError)
{
}
NS_IMETHOD
Run() override
{
mReq->FireError(mError);
return NS_OK;
}
private:
RefPtr<DOMRequest> mReq;
nsString mError;
};
NS_IMETHODIMP
DOMRequestService::FireSuccessAsync(DOMRequest* aRequest,
JS::Handle<JS::Value> aResult)
{
NS_ENSURE_STATE(aRequest);
return FireSuccessAsyncTask::Dispatch(aRequest, aResult);
}
NS_IMETHODIMP
DOMRequestService::FireErrorAsync(DOMRequest* aRequest,
const nsAString& aError)
{
NS_ENSURE_STATE(aRequest);
nsCOMPtr<nsIRunnable> asyncTask = new FireErrorAsyncTask(aRequest, aError);
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(asyncTask));
return NS_OK;
}